10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from __________________ to __________________

Commission File Number: 001-39344

Fusion Pharmaceuticals Inc.

(Exact Name of Registrant as Specified in its Charter)

Canada	Not Applicable
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
270 Longwood Rd., S. Hamilton, ON, Canada	L8P 0A6
(Address of principal executive offices)	(Zip Code)

(289) 799-0891

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common shares, no par value per share	FUSN	The Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
Emerging growth company	☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of May 2, 2023, the registrant had 63,846,009 common shares, with no par value per share, outstanding.

Table of Contents

		Page
PART I.	FINANCIAL INFORMATION	1
Item 1.	Financial Statements	1
	Condensed Consolidated Balance Sheets (Unaudited)	1
	Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited)	2
	Condensed Consolidated Statements of Shareholders’ Equity (Unaudited)	3
	Condensed Consolidated Statements of Cash Flows (Unaudited)	4
	Notes to Condensed Consolidated Financial Statements (Unaudited)	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	45
Item 4.	Controls and Procedures	46
PART II.	OTHER INFORMATION	47
Item 1.	Legal Proceedings	47
Item 1A.	Risk Factors	47
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	103
Item 3.	Defaults Upon Senior Securities	103
Item 4.	Mine Safety Disclosures	103
Item 5.	Other Information	103
Item 6.	Exhibits	104
Signatures		105

i

Summary of Material Risks Associated with Our Business

Our ability to implement our business strategy is subject to numerous risks and uncertainties. This summary does not include all material risks associated with our business and is not a conclusive ranking or prioritization of our risk factors. Further, placement of certain of these risks in the summary section as opposed to others does not constitute guidance that the risk factors included in the summary are the only material risks to consider when considering an investment in our securities. We believe that all risk factors presented in this Quarterly Report on Form 10-Q are important to an understanding of our company and should be given careful consideration. In addition, the summary of company specific risks does not include the appropriate level of detail necessary to fully understand these risks, and the corresponding risk factors that follow provide essential detail and context necessary to fully understand and appreciate these principal risks associated with our business.

These risks include, but are not limited to, the following:

•We have incurred significant losses since inception, and we expect to incur losses over the next several years and may not be able to achieve or sustain revenues or profitability in the future;

•We will require substantial additional financing, which may not be available on acceptable terms, or at all. A failure to obtain this necessary capital when needed could force us to delay, limit, reduce or terminate our product development or commercialization efforts;

•We recently acquired rights to an investigational new drug application, or IND, for the development of our Phase 2 clinical candidate, known as FPI-2265, which is now our most advanced clinical candidate. If we are unable to appropriately transfer the IND to us, secure intellectual property rights or otherwise continue with the Phase 2 clinical program, our business may be materially harmed;

•Assessments of the long-term safety of targeted alpha emitting isotope therapies in humans have been limited, and there may be long-term effects from treatment with any of our future product candidates that we cannot predict at this time;

•We may be unable to obtain a sufficient supply of our product candidates and/or actinium-225, or 225Ac, to support clinical development or at commercial scale;

•Our business is highly dependent on our lead product candidates, FPI-2265 and FPI-1434, as the lead investigational assets for our Targeted Alpha Therapies, or TAT, platform, and we must complete clinical testing before we can seek regulatory approval and begin commercialization of any of these product candidates. If we are unable to obtain regulatory approval for, and successfully commercialize FPI-2265 or FPI-1434, our business may be materially harmed and such failure may affect the viability of our other product candidates;

•We are early in our development efforts. If we are unable to advance our product candidates through clinical development, obtain regulatory approval and ultimately commercialize our product candidates, or if we experience significant delays in doing so, our business will be materially harmed;

•Our approach to the discovery and development of targeted alpha therapeutic product candidates represents a novel approach to radiation therapy, which creates significant and potentially unpredictable challenges for us;

•Clinical development involves a lengthy and expensive process with uncertain outcomes, and results of earlier studies and trials may not be predictive of future clinical trial results. If our preclinical studies and clinical trials are not sufficient to support regulatory approval of any of our product candidates, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development of such product candidate;

•The commercial success of our products and product candidates will depend upon public perception of radiopharmaceuticals and the degree of their market acceptance by physicians, patients, healthcare payors and others in the medical community;

•We expect to develop our existing product candidates, and potentially future product candidates, in combination with other therapies, which exposes us to additional risks;

•The COVID-19 pandemic may materially and adversely affect our business and financial results;

•Presently, some of our product candidates are biologics and the manufacture of such product candidates is complex. Currently, and even after the future completion of the construction of our own manufacturing facility, we rely, and will continue to rely, on third parties to manufacture our lead product candidates for our ongoing clinical trials and our preclinical studies as well as any preclinical studies or clinical trials of our future product candidates that we may conduct. We also expect to rely on third parties for the commercial manufacturing process of our product candidates, if approved. Our business could be harmed if those third parties fail to provide us with sufficient quantities of product supplies or product candidates, or fail to do so at acceptable quality levels or prices;

•The U.S. Food and Drug Administration, or FDA, regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of our product candidates;

•We depend on intellectual property licensed from third parties and termination of any of these licenses could result in the loss of significant rights, which would harm our business; and

•We may be or become a passive foreign investment company, which could result in adverse U.S. federal income tax consequences to U.S. Holders.

ii

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

FUSION PHARMACEUTICALS INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except share amounts)

(Unaudited)

	March 31, 2023			December 31, 2022
Assets
Current assets:
Cash and cash equivalents	$	53,617		$	43,861
Accounts receivable		89			61
Short-term investments		156,227			127,013
Prepaid expenses and other current assets		10,272			7,609
Restricted cash		419			454
Total current assets		220,624			178,998
Property and equipment, net		5,141			4,631
Deferred tax assets		5,300			4,806
Restricted cash		849			1,018
Long-term investments		11,338			15,761
Operating lease right-of-use assets		17,840			5,684
Other non-current assets		5,459			8,166
Total assets	$	266,551		$	219,064
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	1,904		$	2,686
Accrued expenses and other current liabilities		10,353			10,605
Income taxes payable		97			—
Deferred revenue		333			333
Operating lease liabilities		4,638			1,443
Total current liabilities		17,325			15,067
Long-term debt, net of discount		34,360			34,233
Income taxes payable, net of current portion		299			299
Deferred revenue, net of current portion		2,667			2,667
Operating lease liabilities, net of current portion		11,067			4,577
Total liabilities		65,718			56,843
Commitments and contingencies (Note 15)
Shareholders’ equity:
Common shares, no par value, unlimited shares authorized as of March 31, 2023    and December 31, 2022; 63,201,559 and 44,805,627 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively		—			—
Additional paid-in capital		507,071			444,552
Accumulated other comprehensive loss		(85	)		(469	)
Accumulated deficit		(306,153	)		(281,862	)
Total shareholders’ equity		200,833			162,221
Total liabilities and shareholders’ equity	$	266,551		$	219,064

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

1

FUSION PHARMACEUTICALS INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In thousands, except share and per share amounts)

(Unaudited)

	Three Months Ended March 31,
	2023			2022
Collaboration revenue	$	28		$	585
Operating expenses:
Research and development		15,877			12,661
General and administrative		9,006			8,449
Total operating expenses		24,883			21,110
Loss from operations		(24,855	)		(20,525	)
Other income (expense):
Interest income		1,921			83
Interest expense		(1,223	)		—
Other (expense) income, net		(145	)		478
Total other income, net		553			561
Loss before benefit for income taxes		(24,302	)		(19,964	)
Income tax benefit		11			55
Net loss	$	(24,291	)	$	(19,909	)
Unrealized gain (loss) on investments		384			(463	)
Comprehensive loss	$	(23,907	)	$	(20,372	)
Net loss per share—basic and diluted	$	(0.45	)	$	(0.46	)
Weighted-average common shares outstanding—basic and diluted		53,775,985			43,170,076

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

2

FUSION PHARMACEUTICALS INC.

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(In thousands, except share amounts)

(Unaudited)

	Common Shares				Additional Paid-in		Accumulated			Accumulated Other			Total Shareholders’
	Shares		Amount		Capital		Deficit			Comprehensive Loss			Equity
Balances at December 31, 2022		44,805,627	$	—	$	444,552	$	(281,862	)	$	(469	)	$	162,221
Issuance of common shares from private placement financing, net of issuance costs		17,648,596		—		56,003		—			—			56,003
Issuance of common shares from at-the-market offering, net of issuance costs		747,336		—		3,367		—			—			3,367
Share-based compensation expense		—		—		3,149		—			—			3,149
Unrealized gain on investments		—		—		—		—			384			384
Net loss		—		—		—		(24,291	)		—			(24,291	)
Balances at March 31, 2023		63,201,559	$	—	$	507,071	$	(306,153	)	$	(85	)	$	200,833

	Common Shares				Additional Paid-in		Accumulated			Accumulated Other			Total Shareholders’
	Shares		Amount		Capital		Deficit			Comprehensive Loss			Equity
Balances at December 31, 2021		43,073,727	$	—	$	425,821	$	(194,250	)	$	(115	)	$	231,456
Issuance of common shares from at-the-market offering, net of issuance costs		222,726		—		1,627		—			—			1,627
Issuance of common shares upon exercise of stock options		34,685		—		82		—			—			82
Share-based compensation expense		—		—		2,633		—			—			2,633
Unrealized loss on investments		—		—		—		—			(463	)		(463	)
Net loss		—		—		—		(19,909	)		—			(19,909	)
Balances at March 31, 2022		43,331,138	$	—	$	430,163	$	(214,159	)	$	(578	)	$	215,426

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

3

FUSION PHARMACEUTICALS INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended March 31,
	2023			2022
Cash flows from operating activities:
Net loss	$	(24,291	)	$	(19,909	)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense		3,149			2,633
Depreciation and amortization expense		273			203
Non-cash lease expense		405			281
Non-cash interest expense		127			—
(Accretion) amortization of (discounts) premiums on investments, net		(1,101	)		188
Deferred tax benefit		(494	)		(340	)
Other		(1	)		26
Changes in operating assets and liabilities:
Accounts receivable		(28	)		31
Prepaid expenses and other current assets		(2,663	)		2,731
Operating lease right-of-use assets		—			182
Other non-current assets		177			(75	)
Accounts payable		(704	)		(563	)
Accrued expenses and other current liabilities		(35	)		355
Deferred revenue		—			(438	)
Income taxes payable		97			—
Operating lease liabilities		(346	)		(276	)
Net cash used in operating activities		(25,435	)		(14,971	)
Cash flows from investing activities:
Purchases of investments		(62,422	)		(17,330	)
Maturities of investments		39,117			37,056
Purchases of property and equipment		(1,223	)		(595	)
Net cash (used in) provided by investing activities		(24,528	)		19,131
Cash flows from financing activities:
Proceeds from issuance of common shares from private placement		60,005			—
Proceeds from issuance of common shares from at-the-market offering, net of issuance costs		3,367			1,627
Payment of offering costs		(3,857	)		—
Proceeds from issuance of common shares upon exercise of stock options		—			82
Net cash provided by financing activities		59,515			1,709
Net increase in cash, cash equivalents and restricted cash		9,552			5,869
Cash, cash equivalents and restricted cash at beginning of period		45,333			54,789
Cash, cash equivalents and restricted cash at end of period	$	54,885		$	60,658
Supplemental disclosure of cash flow information:
Cash paid for interest	$	1,096		$	—
Right-of-use assets obtained in exchange for new operating lease liabilities	$	12,560		$	339
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued expenses	$	169		$	217
Common share issuance costs included in accounts payable and accrued expenses	$	145		$	—
Debt issuance costs included in accounts payable and accrued expenses	$	—		$	60

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

4

FUSION PHARMACEUTICALS INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.Nature of the Business and Basis of Presentation

Fusion Pharmaceuticals Inc., together with its consolidated subsidiary (“Fusion” or the “Company”), is a clinical-stage oncology company focused on developing next-generation radiopharmaceuticals as precision medicines. The Company was formed and subsequently incorporated as Fusion Pharmaceuticals Inc. in December 2014 under the Canada Business Corporations Act. The Company was founded to advance certain intellectual property relating to radiopharmaceuticals that had been developed by the Centre for Probe Development and Commercialization, a radiopharmaceutical research and good manufacturing practice production center. The Company is headquartered in Hamilton, Ontario.

The Company is subject to risks and uncertainties common to early-stage companies in the biotechnology industry, including, but not limited to, successful discovery and development of its product candidates, development by competitors of new technological innovations, dependence on key personnel, the ability to attract and retain qualified employees, protection of proprietary technology, compliance with governmental regulations, the impact of the COVID-19 pandemic and overall market conditions, the ability to secure additional capital to fund operations and commercial success of its product candidates. Product candidates currently under development will require extensive preclinical and clinical testing and regulatory approval prior to commercialization. These efforts require significant amounts of additional capital, adequate personnel, and infrastructure and extensive compliance-reporting capabilities. Even if the Company’s drug development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales.

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of the Company and its wholly-owned subsidiary, Fusion Pharmaceuticals US Inc. All intercompany accounts and transactions have been eliminated in consolidation.

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the ordinary course of business. Since inception, the Company has funded its operations primarily with proceeds from sales of its convertible preferred shares, including borrowings under a convertible promissory note, which converted into convertible preferred shares, proceeds from sales of its former Irish subsidiary’s preferred exchangeable shares, proceeds from its initial public offering completed in June 2020, proceeds from its “at-the-market” equity offering program (see Note 9), proceeds from its loan and security agreement with Oxford Finance LLC executed in April 2022 (see Note 8), and proceeds from a private placement financing completed in February 2023 (see Note 9). The Company has incurred recurring losses since its inception, including net losses of $24.3 million and $19.9 million for the three months ended March 31, 2023 and 2022, respectively. In addition, as of March 31, 2023, the Company had an accumulated deficit of $306.2 million. The Company expects to continue to generate operating losses for the foreseeable future. As of the issuance date of these condensed consolidated financial statements, the Company expects that its cash, cash equivalents and investments will be sufficient to fund its operating expenses and capital expenditure requirements for at least the next 12 months. The future viability of the Company is dependent on its ability to raise additional capital to finance its operations.

Impacts of COVID-19 and Market Conditions on Our Business

The Company believes its financial results for the three months ended March 31, 2023 and year ended December 31, 2022 were not significantly impacted by the COVID-19 pandemic. The Company believes its hybrid and remote working arrangements have had limited impact on its ability to maintain internal operations during the three months ended March 31, 2023 and year ended December 31, 2022. Further, disruption of global financial markets and a recession or market correction, including as a result of the COVID-19 pandemic, the ongoing military conflict between Russia and Ukraine and the related sanctions imposed against Russia, and other global macroeconomic factors such as inflation and the recent banking industry volatility, could reduce the Company’s ability to access capital, which could, in the future, negatively affect its business and the value of its common shares.

2.Summary of Significant Accounting Policies

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and

5

liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the accrual of research and development expenses, valuations of share-based awards, valuation allowance of deferred tax assets, and revenue recognition. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates when there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results may differ from those estimates or assumptions.

Unaudited Interim Financial Information

The accompanying condensed consolidated balance sheet as of March 31, 2023, the condensed consolidated statement of operations and comprehensive loss, and the condensed consolidated statement of shareholders’ equity, and the condensed consolidated statement of cash flows for the three months ended March 31, 2023 and 2022 are unaudited. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of March 31, 2023 and the results of its operations and its cash flows for the three months ended March 31, 2023 and 2022. The results for the three months ended March 31, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.

The accompanying balance sheet as of December 31, 2022 has been derived from the Company’s audited financial statements for the year ended December 31, 2022. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited interim condensed consolidated financial statements should be read in conjunction with the audited annual consolidated financial statements as of December 31, 2022, and notes thereto, which are included in the Company’s Annual Report on Form 10-K that was filed with the SEC on March 16, 2023.

Foreign Currency and Currency Translation

The reporting currency of the Company is the U.S. dollar. The functional currency of the Company’s operating company in Canada and operating company in the U.S. is also the U.S. dollar. As a result, the Company records no cumulative translation adjustments related to translation of unrealized foreign exchange gains or losses.

For the remeasurement of local currencies to the U.S. dollar functional currency of the Canadian entity, assets and liabilities are translated into U.S. dollars at the exchange rate in effect on the balance sheet date, and income items and expenses are translated into U.S. dollars at the average exchange rate in effect during the period. Resulting transaction gains (losses) are included in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss, as incurred.

Adjustments that arise from exchange rate changes on transactions denominated in a currency other than the local currency are included in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss, as incurred.

During the three months ended March 31, 2023 and 2022, the Company recorded $(0.3) million and $0.3 million, respectively, of foreign currency (losses) gains in the condensed consolidated statements of operations and comprehensive loss.

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents consist of standard checking accounts, money market accounts, and all highly liquid investments with an original maturity of three months or less at the date of purchase.

As of March 31, 2023 and December 31, 2022, the Company was required to maintain a separate cash balance of $0.2 million to collateralize corporate credit cards with a bank, which was classified as restricted cash, current, on its condensed consolidated balance sheets. The Company also maintained a $0.1 million guaranteed investment certificate to fulfill certain contractual obligations which was classified as restricted cash, current, as of March 31, 2023 and December 31, 2022.

In connection with the Company’s lease agreement entered into in October 2019 (see Note 14), the Company maintained a letter of credit of $1.5 million for the benefit of the landlord, which was reduced to $1.0 million during the three months ended March 31, 2023. As of March 31, 2023, $0.2 million and $0.8 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash. As of December 31, 2022, $0.2 million and $1.0 million of the underlying cash balance

6

collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash.

As of March 31, 2023 and December 31, 2022, the cash, cash equivalents and restricted cash of $54.9 million and $45.3 million, respectively, presented in the condensed consolidated statements of cash flows included cash and cash equivalents of $53.6 million and $43.9 million, respectively, and restricted cash of $1.3 million and $1.5 million, respectively.

Investments

The Company adopted ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”) effective January 1, 2023, and the adoption did not have a material impact on its condensed consolidated financial statements.

The Company determines the appropriate classification of its investments in debt securities at the time of purchase and re-evaluates such determination at each balance sheet date. The Company classifies its investments as current or non-current based on each instrument’s underlying maturity date. Investments with original maturities of greater than three months and remaining maturities less than twelve months are classified as current and are included in short-term investments in the condensed consolidated balance sheets. Investments with remaining maturities greater than one year from the balance sheet date are classified as non-current and are included in long-term investments in the condensed consolidated balance sheets. The Company’s investments are classified as available-for-sale, are reported at fair value and consist of U.S. and Canadian government agency debt securities, corporate bonds, and commercial paper. Unrealized gains and losses are included in other comprehensive (loss) income as a component of shareholders’ equity until realized. Amortization and accretion of premiums and discounts are recorded in interest income. Realized gains and losses on debt securities are included in other (expense) income, net.

The Company reviews its portfolio of available-for-sale debt securities, using both quantitative and qualitative factors, to determine if declines in fair value below cost have resulted from a credit-related loss or other factors. If the decline in fair value is due to credit-related factors, a loss is recognized in net loss, and if the decline in fair value is not due to credit-related factors, the loss is recorded in other comprehensive loss. No credit losses were recorded during the periods presented.

Deferred Offering Costs

The Company capitalizes certain legal, professional accounting and other third-party fees that are directly associated with in-process equity financings as deferred offering costs until such financings are consummated. After consummation of an equity financing, these costs are recorded as a reduction of the proceeds from the offering in shareholders’ equity as a reduction of additional paid-in capital generated as a result of the offering. Should an in-process equity financing be abandoned, the deferred offering costs would be expensed immediately as a charge to operating expenses in the condensed consolidated statements of operations and comprehensive loss. The Company recorded $0.2 million of deferred offering costs as of March 31, 2023 and December 31, 2022 in other non-current assets.

Collaborative Arrangements

The Company considers the nature and contractual terms of arrangements and assesses whether an arrangement involves a joint operating activity pursuant to which the Company is an active participant and is exposed to significant risks and rewards dependent on the commercial success of the activity. If the Company is an active participant and is exposed to significant risks and rewards dependent on the commercial success of the activity, the Company accounts for such arrangement as a collaborative arrangement under ASC 808, Collaborative Arrangements. ASC 808 describes arrangements within its scope and considerations surrounding presentation and disclosure, with recognition matters subjected to other authoritative guidance, in certain cases by analogy.

For arrangements determined to be within the scope of ASC 808 where a collaborative partner is not a customer for certain research and development activities, the Company accounts for payments received for the reimbursement of research and development costs as a contra-expense in the period such expenses are incurred. This reflects the joint risk sharing nature of these activities within a collaborative arrangement. The Company classifies payments owed or receivables recorded as other current liabilities or prepaid expenses and other current assets, respectively, in the Company’s consolidated balance sheets.

If payments from the collaborative partner to the Company represent consideration from a customer in exchange for distinct goods and services provided, then the Company accounts for those payments within the scope of ASC 606, Revenue from Contracts with Customers (“ASC 606”). Please refer to Note 3, “Collaboration Agreement” for additional details regarding the Company’s Strategic Collaboration Agreement with AstraZeneca UK Limited (“AstraZeneca”) (the “AstraZeneca Agreement”).

7

Revenue from Contracts with Customers

In accordance with ASC 606, the Company recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the Company expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that the Company determines are within the scope of ASC 606, it performs the following five steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations within the contract and (v) recognize revenue when (or as) the Company satisfies a performance obligation.

The Company only applies the five-step model to contracts when it determines that it is probable it will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer.

At contract inception, once the contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within the contract to determine whether each promised good or service is a performance obligation. The promised goods or services in the Company’s arrangements typically consist of a license to the Company’s intellectual property and/or research and development services. The Company may provide customers with options to additional items in such arrangements, which are accounted for separately when the customer elects to exercise such options, unless the option provides a material right to the customer. Performance obligations are promises in a contract to transfer a distinct good or service to the customer that (i) the customer can benefit from on its own or together with other readily available resources, and (ii) is separately identifiable from other promises in the contract. Goods or services that are not individually distinct performance obligations are combined with other promised goods or services until such combined group of promises meet the requirements of a performance obligation.

The Company determines transaction price based on the amount of consideration the Company expects to receive for transferring the promised goods or services in the contract. Consideration may be fixed, variable, or a combination of both. At contract inception for arrangements that include variable consideration, the Company estimates the probability and extent of consideration it expects to receive under the contract utilizing either the most likely amount method or expected amount method, whichever best estimates the amount expected to be received. The Company then considers any constraints on the variable consideration and includes in the transaction price variable consideration to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved.

The Company then allocates the transaction price to each performance obligation based on the relative standalone selling price and recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) control is transferred to the customer and the performance obligation is satisfied. For performance obligations which consist of licenses and other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

The Company records amounts as accounts receivable when the right to consideration is deemed unconditional. Amounts received, or that are unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract are recognized as deferred revenue. Amounts expected to be recognized as revenue within the 12 months following the balance sheet date are classified as the current portion of deferred revenue. Amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as deferred revenue, net of current portion.

The Company’s revenue generating arrangements typically include upfront license fees, milestone payments and/or royalties.

If a license is determined to be distinct from the other performance obligations identified in the arrangement, the Company recognizes revenue from nonrefundable, up-front fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. For licenses that are bundled with other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

At the inception of an agreement that includes research and development milestone payments, the Company evaluates each milestone to determine when and how much of the milestone to include in the transaction price. The Company first estimates the amount of the milestone payment that the Company could receive using either the expected value or the most likely amount approach. The Company primarily uses the most likely amount approach as this approach is generally most predictive for milestone payments with a binary outcome. Then, the Company considers whether any portion of the estimated amount is subject to the variable consideration constraint (that is, whether it is probable that a significant reversal of cumulative revenue would not occur upon resolution of the uncertainty). The Company updates the estimate of variable consideration included in the transaction price at each reporting date which

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includes updating the assessment of the likely amount of consideration and the application of the constraint to reflect current facts and circumstances.

For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company will recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied).

For the three months ended March 31, 2023 and 2022, the Company recorded less than $0.1 million and $0.6 million, respectively, of revenue under collaboration agreements. Please refer to Note 3, “Collaboration Agreement” for additional details regarding revenue recognition under the AstraZeneca Agreement.

Business Combinations

In determining whether an acquisition should be accounted for as a business combination or asset acquisition, the Company first determines whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this is the case, the single identifiable asset or the group of similar assets is not deemed to be a business, and is instead deemed to be an asset. If this is not the case, the Company then further evaluates whether the single identifiable asset or group of similar identifiable assets and activities includes, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. If so, the Company concludes that the single identifiable asset or group of similar identifiable assets and activities is a business.

The Company accounts for business combinations using the acquisition method of accounting. Application of this method of accounting requires that (i) identifiable assets acquired (including identifiable intangible assets) and liabilities assumed generally be measured and recognized at fair value as of the acquisition date and (ii) the excess of the purchase price over the net fair value of identifiable assets acquired and liabilities assumed be recognized as goodwill, which is not amortized for accounting purposes but is subject to testing for impairment at least annually. Acquired in-process research and development (“IPR&D”) is recognized at fair value and initially characterized as an indefinite-lived intangible asset, irrespective of whether the acquired IPR&D has an alternative future use. Transaction costs related to business combinations are expensed as incurred. Determining the fair value of assets acquired and liabilities assumed in a business combination requires management to use significant judgment and estimates, especially with respect to intangible assets.

During the measurement period, which extends no later than one year from the acquisition date, the Company may record certain adjustments to the carrying value of the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, all adjustments are recorded in the consolidated statements of operations as operating expenses or income.

To date, the Company has not recorded any acquisitions as a business combination.

Asset Acquisitions

The Company measures and recognizes asset acquisitions that are not deemed to be business combinations based on the cost to acquire the assets, which includes transaction costs. Goodwill is not recognized in asset acquisitions. In an asset acquisition, the cost allocated to acquire IPR&D with no alternative future use is charged to expense at the acquisition date.

Contingent consideration in asset acquisitions payable in the form of cash is recognized when payment becomes probable and reasonably estimable, unless the contingent consideration meets the definition of a derivative, in which case the amount becomes part of the asset acquisition cost when acquired. Contingent consideration payable in the form of a fixed number of the Company’s own shares is measured at fair value as of the acquisition date and recognized when the issuance of the shares becomes probable. Upon recognition of the contingent consideration payment, the amount is included in the cost of the acquired asset or group of assets, or, if related to IPR&D with no alternative future use, charged to expense.

Fair Value Measurements

Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried

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at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable:

•Level 1—Quoted prices in active markets for identical assets or liabilities.

•Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data.

•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

The Company’s cash equivalents and investments are carried at fair value, determined according to the fair value hierarchy described above (see Note 4). The carrying values of the Company’s amounts due for Canadian harmonized sales tax, accounts payable and accrued expenses approximate their fair values due to the short-term nature of these liabilities.

Leases

The Company accounts for leases in accordance with ASC 842, Leases. At contract inception, the Company determines if an arrangement is or contains a lease. A lease conveys the right to control the use of an identified asset for a period of time in exchange for consideration. If determined to be or contain a lease, the lease is assessed for classification as either an operating or finance lease at the lease commencement date, defined as the date on which the leased asset is made available for use by the Company, based on the economic characteristics of the lease. For each lease with a term greater than twelve months, the Company records a right-of-use asset and lease liability.

A right-of-use asset represents the economic benefit conveyed to the Company by the right to use the underlying asset over the lease term. A lease liability represents the obligation to make lease payments arising from the lease. The Company records amortization of operating right-of-use assets and accretion of lease liabilities as a single lease cost on a straight-line basis over the lease term. The Company elected the practical expedient to not separate lease and non-lease components and therefore measures each lease payment as the total of the fixed lease and associated non-lease components. Lease liabilities are measured at the lease commencement date and calculated as the present value of the future lease payments in the contract using the rate implicit in the contract, when available. If an implicit rate is not readily determinable, the Company uses its incremental borrowing rate measured as the rate at which the Company could borrow, on a fully collateralized basis, a commensurate loan in the same currency over a period consistent with the lease term at the commencement date. Right-of-use assets are measured as the lease liability plus initial direct costs and prepaid lease payments, less lease incentives granted by the lessor. The lease term is measured as the noncancelable period in the contract, adjusted for any options to extend or terminate when it is reasonably certain the Company will extend the lease term via such options based on an assessment of economic factors present as of the lease commencement date. The Company elected the practical expedient to not recognize leases with a lease term of twelve months or less.

The Company assesses its right-of-use assets for impairment consistent with the assessment performed for long-lived assets used in operations. If an impairment is recognized on operating lease right-of-use assets, the lease liability continues to be recognized using the same effective interest method as before the impairment and the operating lease right-of-use asset is amortized over the remaining term of the lease on a straight-line basis.

The Company’s operating leases are presented in the condensed consolidated balance sheet as operating lease right-of-use assets, classified as noncurrent assets, and operating lease liabilities, classified as current and noncurrent liabilities based on the discounted lease payments to be made within the proceeding twelve months. Variable costs associated with a lease, such as maintenance and utilities, are not included in the measurement of the lease liabilities and right-of-use assets but rather are expensed when the events determining the amount of variable consideration to be paid have occurred.

Research, Development and Manufacturing Contract Costs and Accruals

The Company has entered into various research, development and manufacturing contracts with research institutions and other companies. These agreements are generally cancelable, and related costs are recorded as research and development expenses as incurred. The Company records accruals for estimated ongoing research, development and manufacturing costs. When billing terms under these contracts do not coincide with the timing of when the work is performed, the Company is required to make estimates of outstanding obligations to those third parties as of period end. Any accrual estimates are based on a number of factors, including the Company’s knowledge of the progress towards completion of the research, development and manufacturing activities, invoicing to date under the contracts, communication from the research institutions and other companies of any actual costs incurred during the period that have not yet been invoiced and the costs included in the contracts. Significant judgments and estimates may be made in determining the

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accrued balances at the end of any reporting period. Actual results could differ from the estimates made by the Company. The historical accrual estimates made by the Company have not been materially different from the actual costs.

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in shareholders’ equity that result from transactions and economic events other than those with shareholders. For the three months ended March 31, 2023 and 2022, unrealized gains and losses on investments are included in other comprehensive (loss) income as a component of shareholders’ equity until realized.

Net Loss per Share

Basic net income (loss) per share attributable to common shareholders is computed by dividing the net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted net income (loss) attributable to common shareholders is computed by adjusting net income (loss) attributable to common shareholders to reallocate undistributed earnings based on the potential impact of dilutive securities. Diluted net income (loss) per share attributable to common shareholders is computed by dividing the diluted net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period, including potential dilutive common shares. For purpose of this calculation, outstanding stock options, restricted stock units and warrants are considered potential dilutive common shares.

Recently Adopted Accounting Pronouncements

The Company qualifies as “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected to “opt in” to the extended transition related to complying with new or revised accounting standards, which means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company will adopt the new or revised standard at the time nonpublic companies adopt the new or revised standard and will do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for private companies.

In June 2016, the FASB issued ASU 2016-13 which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with an expected loss model. It also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. In November 2018, the FASB issued ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, which narrowed the scope and changed the effective date for non-public entities for ASU 2016-13. The FASB subsequently issued supplemental guidance within ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief (“ASU 2019-05”). ASU 2019-05 provides an option to irrevocably elect the fair value option for certain financial assets previously measured at amortized cost basis. This guidance is effective for the Company for annual periods beginning after December 15, 2022, including interim periods within that fiscal year. The Company adopted ASU 2016-13 effective January 1, 2023, and the adoption did not have a material impact on its condensed consolidated financial statements.

3.Collaboration Agreement

Strategic Collaboration Agreement with AstraZeneca UK Limited

In October 2020, the Company and AstraZeneca entered into the AstraZeneca Agreement pursuant to which the Company and AstraZeneca will work to jointly discover, develop and commercialize next-generation alpha-emitting radiopharmaceuticals and combination therapies for the treatment of cancer globally by leveraging the Company’s Targeted Alpha Therapies (“TATs”) platform and expertise in radiopharmaceuticals with AstraZeneca’s leading portfolio of antibodies and cancer therapeutics, including DNA damage response inhibitors (“DDRis”). Each party retains full ownership over its existing assets.

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The AstraZeneca Agreement consists of two distinct collaboration programs: novel TATs and combination therapies. Under the AstraZeneca Agreement, the parties may develop up to three novel TATs (the “Novel TATs Collaboration”). The parties will also evaluate up to five potential combination strategies involving the Company’s existing assets, including the Company’s lead candidate FPI-1434, in combination with certain of AstraZeneca’s existing therapeutics for the treatment of various cancers (the “Combination Therapies Collaboration”).

The AstraZeneca Agreement expires on a TAT-by-TAT and combination-by-combination basis upon the later of the expiration of development and exclusivity obligations relating to such TAT or combination or, if such TAT or combination is commercialized as a product under the AstraZeneca Agreement, the expiration of the commercial life of such product. The Company and AstraZeneca can each terminate the AstraZeneca Agreement for the other party’s uncured material breach following the applicable notice period. Each of the Company and AstraZeneca may also terminate the AstraZeneca Agreement with respect to any TAT or combination product if such party determines that the continued development of such TAT or combination product is not commercially viable, or for a material safety issue with respect to such TAT or combination product.

Novel TATs Collaboration

As part of the Novel TATs Collaboration, the parties may develop up to three novel TATs. The Company and AstraZeneca will share development costs equally (with each party responsible for the cost of its own supply in connection with such development). Either party has the right to opt out of the co-development and co-commercialization arrangement at pre-determined timepoints and obtain exclusive rights to a novel TAT in exchange for milestone payments to the other party of up to $145.0 million per novel TAT and a low or high single-digit royalties on future sales (depending on the opt out time point). If neither party opts out, and unless otherwise agreed by the parties, AstraZeneca will lead worldwide commercialization activities for the novel TATs, subject to the Company’s option to co-promote the TATs in the U.S. All profits and losses resulting from such commercialization activities will be shared equally. In January 2022, the Company announced the nomination of the first novel TAT candidate under the Novel TATs Collaboration, which the Company refers to as FPI-2068. FPI-2068 is a TAT designed to deliver 225Ac to various solid tumors that express epidermal growth factor receptor (“EGFR”) and mesenchymal epithelial transition factor (“cMET”). In April 2023, the Company announced the clearance of investigational new drug applications (“INDs”) for FPI-2068 and its corresponding imaging analogue, FPI-2107, by the FDA.

The Novel TATs Collaboration is within the scope of ASC 808 as the Company and AstraZeneca are both active participants in the research and development activities and are exposed to significant risks and rewards that are dependent on commercial success of the activities of the arrangement. The research and development activities are a unit of account under the scope of ASC 808 and are not promises to a customer under the scope of ASC 606.

The Company records its portion of the research and development expenses as the related expenses are incurred. All payments received or amounts due from AstraZeneca for reimbursement of shared costs are accounted for as an offset to research and development expense. For the three months ended March 31, 2023 and 2022, the Company incurred $1.6 million and $0.7 million, respectively, in research and development expenses relating to the Novel TATs Collaboration which was offset by $0.6 million and $0.3 million, respectively, in amounts due from AstraZeneca for reimbursement of shared costs. As of March 31, 2023 and December 31, 2022, the Company recorded $0.9 million and $0.4 million, respectively, due from AstraZeneca for reimbursement of shared costs in prepaid expenses and other current assets.

Combination Therapies Collaboration

As part of the Combination Therapies Collaboration, the parties will evaluate up to five potential combination strategies involving the Company’s existing assets, including the Company’s lead candidate FPI-1434, in combination with certain of AstraZeneca’s existing therapeutics for the treatment of various cancers. The Company received an upfront payment of $5.0 million from AstraZeneca in December 2020 associated with the Combination Therapies Collaboration. AstraZeneca will fully fund all research and development activities for the combination strategies, until such point as the Company may opt-in to the clinical development activities.

The Company also has the right to opt-out of clinical development activities relating to these combination therapies. In such instance, the Company will be responsible for repaying its share of the development costs via a royalty on the additional combination sales only if its drug is approved on the basis of clinical development solely conducted by AstraZeneca, in which case the royalty payments shall also include a variable risk premium based on the number of the Company’s product candidates to have received regulatory approval at that time.

Each party will have the sole right, on a country-by-country basis, to commercialize its respective contributed compound as a component of any combination therapy for which such party’s contributed compound may be commercialized under a separate marketing authorization from the other party’s contributed compound to such combination therapy. The parties will negotiate in good faith on a combination therapy-by-combination therapy basis the terms and conditions to co-commercialize any combination therapy

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that is to be commercialized under a single marketing authorization. During the period of time commencing with the inclusion of an available molecular target in the selection pool for development as a combination therapy and ending upon the end of the nomination period or earlier removal of such combination target from such pool, the Company will not undertake any preclinical or clinical studies combining the Company’s TAT platform with any compound modulating the activity of such combination target. Following selection of a target under the AstraZeneca Agreement and payment of an exclusivity fee by AstraZeneca, and provided that AstraZeneca enrolls its first patient in a clinical trial as further defined in the AstraZeneca Agreement within a pre-defined period of time of such selection, the Company will not undertake any preclinical or clinical studies combining the Company’s TAT platform with compounds modulating the same combination target for the duration of the evaluation period for such combination target, as further defined in the AstraZeneca Agreement. Within a certain time period following initiation of the evaluation period with respect to a combination target, AstraZeneca has the exclusive right to undertake, alone or in collaboration with the Company, all further clinical or preclinical combination studies with respect to a combination target by paying certain exclusivity fees. The Company is eligible to receive future payments of up to $40.0 million, including those for the achievement of certain clinical milestones and exclusivity fees.

The Company determined the research and development activities associated with the Combination Therapies Collaboration are a key component of its central operations and AstraZeneca has contracted with the Company to obtain goods and services which are an output of the Company’s ordinary activities in exchange for consideration. Further, the Company does not share the risks and rewards of the underlying research activities making AstraZeneca a customer for the Combination Therapies Collaboration which falls within the scope of ASC 606.

To determine the appropriate amount of revenue to be recognized under ASC 606, the Company performed the following steps: (i) identify the promised goods or services in the contract, (ii) determine whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract, (iii) measure the transaction price, including the constraint on variable consideration, (iv) allocate the transaction price to the performance obligations and (v) recognize revenue when (or as) the Company satisfies each performance obligation.

Under ASC 606 the Company accounts for (i) the license it conveyed to AstraZeneca with respect to certain intellectual property and (ii) the obligations to perform research and development services as part of the Combination Therapies Collaboration as a single performance obligation under the AstraZeneca Agreement. The Company concluded AstraZeneca’s right to purchase exclusive options to obtain certain development, manufacturing and commercialization rights represent customer options that are not performance obligations as they do not contain any discounts or other rights that would be considered a material right in the arrangement. Such options will be accounted for upon AstraZeneca’s election.

The Company determined the transaction price under ASC 606 at the inception of the AstraZeneca Agreement to be the $5.0 million upfront payment. The cost reimbursement payments for all costs incurred by the Company under the Combination Therapies Collaboration represent variable consideration that is not constrained. Additionally, the clinical milestone payments represent variable consideration that is constrained. In making this assessment, the Company considered several factors, including the fact that achievement of the milestones are outside its control and contingent upon the future success of clinical trials and AstraZeneca’s actions. The payments related to the achievement of certain clinical milestones do not relate to separate, distinct performance obligations.

Under ASC 606, the Company recognizes revenue using the cost-to-cost method, which it believes best depicts the transfer of control to the customer. Under the cost-to-cost method, the extent of progress towards completion is measured based on the ratio of actual costs incurred to the total estimated costs expected upon satisfying the identified performance obligation. Under this method, revenue is recorded as a percentage of the estimated transaction price based on the extent of progress towards completion. Under ASC 606, the estimated transaction price includes variable consideration that is not constrained. The Company does not include variable consideration to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will occur when any uncertainty associated with the variable consideration is resolved. The estimate of the Company’s measurement of progress and estimate of variable consideration to be included in the transaction price will be updated at each reporting date as a change in estimate.

For the clinical milestone payments, the Company utilizes the most likely amount method to determine the amounts recognized and timing of recognition. Once the constraint is removed, the clinical milestone payments will be accounted for with the research and development services for the purposes of revenue recognition which will occur over time as the services are provided. Upon the achievement of any milestone for specified clinical development events, the Company will utilize the same cost-to-cost model with a cumulative catch-up recognized in the period in which any such event occurs.

The Company will re-evaluate the transaction price at the end of each reporting period and as uncertain events are resolved, or other changes in circumstances occur, adjust its estimate of the transaction price if necessary. The Company initially recorded the $5.0 million upfront fee as a contract liability for deferred revenue in its consolidated balance sheet.

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The following table presents changes in the Company’s accounts receivable and contract liabilities for the three months ended March 31, 2023 (in thousands):

	Balance as of						Balance as of
	December 31, 2022		Additions		Deductions		March 31, 2023
Accounts receivable	$	61	$	28	$	—	$	89
Contract liabilities:
Deferred revenue	$	3,000	$	—	$	—	$	3,000

During the three months ended March 31, 2023 and 2022, the Company recognized the following revenue (in thousands):

	Three Months Ended March 31,
	2023		2022
Revenue recognized in the period from:
Amounts included in deferred revenue at the beginning of the period	$	—	$	438

The current portion of deferred revenue and deferred revenue, net of current portion, are $0.3 million and $2.7 million as of March 31, 2023, respectively, which reflects the Company’s estimate of the revenue it expects to recognize within the next 12 months and beyond 12 months, respectively. The Company expects to recognize the revenue associated with the AstraZeneca Agreement in subsequent periods through the year ending December 31, 2026.

4.Fair Value Measurements

The following tables present information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy used to determine such fair values (in thousands):

	Fair Value Measurements as of March 31, 2023 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	14,556	$	—	$	—	$	14,556
Investments:
Commercial paper		—		31,874		—		31,874
Corporate bonds		—		11,371		—		11,371
Canadian Government agency debt securities		—		15,987		—		15,987
U.S. Government agency debt securities		—		108,333		—		108,333
	$	14,556	$	167,565	$	—	$	182,121

	Fair Value Measurements as of December 31, 2022 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	4,241	$	—	$	—	$	4,241
U.S. Government agency debt securities		—		5,974		—		5,974
Investments:
Commercial paper		—		28,792		—		28,792
Corporate bonds		—		14,342		—		14,342
Municipal bonds		—		2,697		—		2,697
Canadian Government agency debt securities		—		19,911		—		19,911
U.S. Government agency debt securities		—		77,032		—		77,032
	$	4,241	$	148,748	$	—	$	152,989

During the three months ended March 31, 2023 and the year ended December 31, 2022, there were no transfers between Level 1, Level 2 and Level 3.

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5.Investments

Investments consisted of the following (in thousands):

	March 31, 2023
	Amortized Cost		Fair Value
Due within one year or less	$	156,339	$	156,227
Due after one year through three years		11,311		11,338
	$	167,650	$	167,565

	December 31, 2022
	Amortized Cost		Fair Value
Due within one year or less	$	127,441	$	127,013
Due after one year through three years		15,802		15,761
	$	143,243	$	142,774

As of March 31, 2023, the amortized cost and estimated fair value of investments, by contractual maturity, was as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Current		Non-Current
Commercial paper	$	31,892	$	2	$	(20	)	$	31,874	$	31,874	$	—
Corporate bonds		11,386		1		(16	)		11,371		8,405		2,966
Canadian Government agency debt securities		16,009		47		(69	)		15,987		15,987		—
U.S. Government agency debt securities		108,363		89		(119	)		108,333		99,961		8,372
	$	167,650	$	139	$	(224	)	$	167,565	$	156,227	$	11,338

As of December 31, 2022, the amortized cost and estimated fair value of investments, by contractual maturity, was as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Current		Non-Current
Commercial paper	$	28,804	$	10	$	(22	)	$	28,792	$	28,792	$	—
Corporate bonds		14,354		4		(16	)		14,342		9,469		4,873
Municipal bonds		2,705		—		(8	)		2,697		2,697		—
Canadian Government agency debt securities		20,065		23		(177	)		19,911		19,911		—
U.S. Government agency debt securities		77,315		15		(298	)		77,032		66,144		10,888
	$	143,243	$	52	$	(521	)	$	142,774	$	127,013	$	15,761

6.Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Prepaid external research and development expenses	$	5,282	$	3,741
Prepaid insurance		629		1,295
Prepaid software subscriptions		612		402
Income tax receivable		—		386
Interest receivable		591		332
Other receivable due from AstraZeneca		938		352
Canadian harmonized sales tax receivable		923		592
Other		1,297		509
	$	10,272	$	7,609

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7.Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Accrued employee compensation and benefits	$	2,532	$	4,140
Accrued external research and development expenses		5,539		4,914
Accrued professional and consulting fees		1,782		916
Unearned grant income		435		591
Other		65		44
	$	10,353	$	10,605

8.Debt

Long-term debt, net of discount, consisted of the following (in thousands):

	March 31,
	2023
Principal amount of long‑term debt	$	35,000
Less: Current portion of long‑term debt		—
Long‑term debt, net of current portion		35,000
Accretion of Final Fee		195
Debt discount		(835	)
Long‑term debt, net of discount	$	34,360

Loan Agreement

On April 4, 2022 (the “Original Closing Date”), the Company entered into a loan and security agreement (the “Loan Agreement”) with Oxford Finance LLC, as collateral agent and lender (the “Lender”). The Lender initially agreed to make available to the Company term loans in an aggregate principal amount of up to $75.0 million under the Loan Agreement. The Company plans to use the proceeds of the term loans for working capital and general corporate purposes. The Loan Agreement initially provided a term loan commitment of $75.0 million in three potential tranches: (i) a $25.0 million Term A loan facility, with $10.0 million funded on the Original Closing Date and the remaining $15.0 million to be funded at the request of the Company on a one-time basis at any time prior to April 4, 2023, (ii) a $25.0 million Term B loan facility to be funded at the request of the Company, subject to certain conditions being met, no later than June 30, 2023, and (iii) a $25.0 million Term C loan facility to be funded at the Lender’s sole discretion. The term loan facilities have a maturity date of April 1, 2027. Initially borrowings under all three loan facilities bear interest at a floating per annum rate equal to the greater of (i) 8.00% and (ii) the sum of (a) the greater of (x) 1 Month LIBOR Rate and (y) 0.10% plus (b) 7.90%.

On August 23, 2022, the Company and the Lender entered into a Consent and First Amendment to Loan and Security Agreement to amend certain terms of the Loan Agreement.

On September 21, 2022, the Company and the Lender entered into a Second Amendment to Loan and Security Agreement (the “Second Amendment”). The Second Amendment provides a term loan commitment of $75.0 million in four potential tranches: (i) a $10.0 million Term A loan facility, funded on the Original Closing Date, (ii) a $25.0 million Term B loan facility, funded at the request of the Company subject to certain conditions having been met, for which funding took place in connection with the execution of the Second Amendment, (iii) a $15.0 million Term C loan facility to be funded at the request of the Company, subject to certain conditions being met, no later than April 4, 2023, and (iv) a $25.0 million Term D loan facility to be funded at the Lender’s sole discretion. The term loan facilities have a maturity date of April 1, 2027. The floating per annum rate of interest for borrowings under all four loan facilities was amended to the greater of (i) 8.00% and (ii) the sum of (a) 1-Month CME Term SOFR (as defined in the Second Amendment), (b) 0.10% and (c) 7.90%.

Additionally, on March 30, 2023, the Company and the Lender entered into a Third Amendment to Loan and Security Agreement (together with the Loan Agreement, Consent and First Amendment to Loan and Security Agreement, and Second Amendment, the “Amended Loan Agreement”) to amend the availability of the Term C loan facility which is to be funded at the request of the Company, subject to certain conditions being met, no later than March 31, 2024, under the Amended Loan Agreement.

As the terms of the amendments were not substantially different than the terms of the Loan Agreement, the amendments were accounted for as a debt modification. Issuance costs paid to the Lender in connection with the amendments were recorded as an additional

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debt discount and will be amortized to interest expense over the remaining term, together with unamortized original issuance costs, using the effective interest method.

The Company is permitted to make interest-only payments on any outstanding amount due under the term loans through June 1, 2025, after which time principal will also be repaid based on an amortization schedule.

The Company is obligated to pay a fee equal to 4.00% of the aggregate amount of the term loans funded (the “Final Fee”), to occur upon the earliest of (i) the maturity date, (ii) the acceleration of the term loans, and (iii) the prepayment of the term loans. The Company accretes the Final Fee that will be due at final repayment to outstanding debt by charges to interest expense over the term of the loans using the effective-interest method.

The Company has the option to prepay all, but not less than all, of the outstanding principal balance of the term loans under the Loan Agreement. If the Company prepays all or a portion of the term loans prior to the maturity date, it is obligated to pay the Lender a prepayment fee based on a percentage of the outstanding principal balance of the loans, equal to 3.00% if the payment occurs on or before 12 months after the funding date of the applicable loan, 2.00% if the prepayment occurs more than 12 months after, but on or before 24 months after, the funding date of the applicable loan, or 1.00% if the prepayment occurs more than 24 months after, but on or before 36 months after, the funding date of the applicable loan, and no prepayment fee is required thereafter.

The Loan Agreement contains financial covenants that require the Company to maintain certain minimum cash balances generally equal to 55% of the outstanding principal or 110% of the outstanding principal in cases where the cash balances are not maintained in accounts pledged as collateral for the benefit of the Lender. The Company was in compliance with all such covenants as of March 31, 2023. The Loan Agreement contains customary representations, warranties and covenants and also includes customary events of default, including payment defaults, breaches of covenants, change of control and a material adverse change default. Upon the occurrence of an event of default, a default interest rate of an additional 5.00% per annum may be applied to the outstanding loan balances, and the Lender may declare all outstanding obligations immediately due and payable. The Company’s obligations under the Loan Agreement are collateralized by a first priority security interest in substantially all of its assets.

As of March 31, 2023, the estimated future principal payments due were as follows (in thousands):

Year Ending December 31,
2023 (nine months)	$	—
2024		—
2025		10,652
2026		18,261
2027		6,087
	$	35,000

In connection with the Loan Agreement and the funding of the Term A loan facility, the Company issued warrants to the Lender (the “Term A Warrants”) (see Note 9) to purchase an aggregate of 26,110 common shares, equal to 2.00% of the $10.0 million funded from the Term A loan facility divided by the exercise price of $7.66 per share.

In connection with the funding of the Term B loan facility, the Company issued warrants to the Lender (the “Term B Warrants”) (see Note 9) to purchase an aggregate 170,010 common shares, equal to 2.00% of the $25.0 million funded from the Term B loan facility divided by the exercise price of $2.94 per share.

The Company is obligated to issue additional warrants (the “Additional Warrants”) to the Lender in the event the Term C loan facility and/or the Term D loan facility is funded. The Additional Warrants will also be equal to 2.00% of the term loan funded. Each warrant will terminate ten years from the date of its original issuance.

The Company accounted for the Term A Warrants and Term B Warrants as equity instruments since they were indexed to the common shares and met the criteria for equity classification. The relative fair value of the Term A Warrants and Term B Warrants were $0.1 million and $0.4 million, respectively, and were recorded as a debt discount. This amount is being amortized to interest expense over the term of the loans using the effective-interest method. The Company estimated the fair value of the Term A Warrants and Term B Warrants using the Black-Scholes option-pricing model.

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9.Equity

Common Shares

On February 13, 2023, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with the purchasers named therein (the “Investors”). Pursuant to the Purchase Agreement, the Company agreed to sell an aggregate of 17,648,596 of its common shares, no par value per share, at a purchase price equal to $3.40 per share, which represents the closing price on the Nasdaq Global Select Market on February 10, 2023, to the Investors for net proceeds of approximately $56.0 million after deducting fees and offering costs (collectively, the “Offering”). The Offering closed on February 16, 2023.

In July 2021, the Company entered into an Open Market Sales AgreementSM (the “Sales Agreement”) with Jefferies LLC to issue and sell common shares of up to $100.0 million in gross proceeds, from time to time during the term of the Sales Agreement, through an “at-the-market” equity offering program under which Jefferies LLC will act as the Company’s agent and/or principal (the “ATM Facility”). The ATM Facility provides that Jefferies LLC will be entitled to compensation for its services in an amount of up to 3.0% of the gross proceeds of any shares sold under the ATM Facility. The Company has no obligation to sell any shares under the ATM Facility and may, at any time, suspend solicitation and offers under the Sales Agreement. As of March 31, 2023, the Company has sold 2,210,217 common shares for net proceeds of $9.2 million under the Sales Agreement.

As of March 31, 2023, the Company’s articles of the corporation, as amended and restated, authorized the Company to issue unlimited common shares, each with no par value per share.

Each common share entitles the holder to one vote on all matters submitted to a vote of the Company’s shareholders. Common shareholders are entitled to receive dividends, if any, as may be declared by the board of directors. Through March 31, 2023, no cash dividends had been declared or paid by the Company.

Warrants

In January 2020, the Company issued to the existing holders of Class B convertible preferred shares warrants to purchase 3,126,391 Class B convertible preferred shares, at an exercise price of $1.5154 per share, and Fusion Pharmaceuticals (Ireland) Limited, the Company’s former Irish subsidiary, issued to the existing holders of Class B preferred exchangeable shares warrants to purchase 873,609 Class B preferred exchangeable shares, at an exercise price of $1.5154 per share (collectively the “Preferred Share Warrants”). The Preferred Share Warrants were immediately exercisable and expire two years from the date of issuance or upon the earlier occurrence of specified qualifying events.

Upon the closing of the IPO, the warrants to purchase the convertible preferred shares and warrants to purchase the preferred exchangeable shares of the Company’s former Irish subsidiary were converted into warrants to purchase 749,197 common shares at an exercise price of $8.10 per share. In January 2022, the remaining 651,816 of unexercised common share warrants expired.

In April 2022, in connection with the Loan Agreement with Oxford Finance LLC (see Note 8) and the funding of the Term A loan facility, the Company issued warrants to the Lender to purchase an aggregate of 26,110 common shares, equal to 2.00% of the $10.0 million funded from the Term A loan facility divided by the exercise price of $7.66 per share.

In September 2022, the Term B loan facility was funded by Oxford Finance LLC and the Company issued warrants to the Lender to purchase an aggregate of 170,010 common shares, equal to 2.00% of the $25.0 million funded from the Term B loan facility divided by the exercise price of $2.94 per share.

The Company is obligated to issue additional warrants to the Lender in the event the Term C loan facility and/or the Term D loan facility is funded. As of March 31, 2023, there were 196,120 common share warrants outstanding.

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10.Share-based Compensation

2020 Stock Option and Incentive Plan

On June 18, 2020, the Company’s board of directors adopted the 2020 Stock Option and Incentive Plan (the “2020 Plan”), which became effective on June 24, 2020. The 2020 Plan provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock units, restricted stock awards, unrestricted stock awards, cash-based awards and dividend equivalent rights to the Company’s officers, employees, non-employee directors and consultants. The number of shares initially reserved for issuance under the 2020 Plan was 4,273,350, which is cumulatively increased each January 1 by 4% of the number of the Company’s common shares outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s compensation committee of the board of directors. The common shares underlying any awards that are forfeited, cancelled, held back upon exercise or settlement of an award to satisfy the exercise price or tax withholding, reacquired by the Company prior to vesting, satisfied without the issuance of shares, expire or are otherwise terminated (other than by exercise) under the 2020 Plan and the Company’s 2017 Equity Incentive Plan (the “2017 Plan”) will be added back to the common shares available for issuance under the 2020 Plan. The total number of common shares reserved for issuance under the 2020 Plan was 10,073,459 shares as of March 31, 2023.

As of March 31, 2023, 1,370,967 shares, remained available for future grant under the 2020 Plan. Shares that are expired, forfeited, canceled or otherwise terminated without having been fully exercised will be available for future grant under the 2020 Plan.

2017 Equity Incentive Plan

The 2017 Plan provides for the Company to grant incentive stock options or nonqualified stock options, restricted share awards and restricted share units to employees, officers, directors and non-employee consultants of the Company.

As of March 31, 2023 and December 31, 2022, no shares remained available for future grant under the 2017 Plan. Shares that are expired, forfeited, canceled or otherwise terminated without having been fully exercised will be available for future grant under the 2020 Plan.

2020 Employee Share Purchase Plan

On June 18, 2020, the Company’s board of directors adopted the 2020 Employee Share Purchase Plan (the “ESPP”), which became effective on June 24, 2020. A total of 450,169 common shares were reserved for issuance under this plan. In addition, the number of common shares that may be issued under the ESPP is automatically increased each January 1 by the lesser of (i) 900,338 common shares, (ii) 1% of the number of the Company’s common shares outstanding on the immediately preceding December 31 and (iii) such lesser number of shares as determined by the Company’s compensation committee of the board of directors. As of March 31, 2023, 43,857 shares were issued under the ESPP. The total number of common shares reserved for issuance under the ESPP was 1,746,220 shares as of March 31, 2023.

Stock Option Valuation

The fair value of stock option grants is estimated using the Black-Scholes option-pricing model. The Company historically has been a private company and lacks company-specific historical and implied volatility information. Therefore, it estimates its expected share volatility based on the historical volatility of a publicly traded set of peer companies and expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded share price. For options with service-based vesting conditions, the expected term of the Company’s stock options has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The expected term of stock options granted to non-employee consultants is equal to the contractual term of the option award. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company has never paid cash dividends and does not expect to pay any cash dividends in the foreseeable future.

The following table presents, on a weighted-average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted:

	Three Months Ended March 31,
	2023			2022
Risk-free interest rate		3.85	%		1.72	%
Expected term (in years)		6.0			6.0
Expected volatility		65.2	%		65.7	%
Expected dividend yield		0	%		0	%

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Stock Options

The following table summarizes the Company’s stock option activity since December 31, 2022:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)		(in thousands)
Outstanding as of December 31, 2022		10,531,555		$	7.08		7.5	$	4,434
Granted		3,870,000			3.70
Exercised		—			—
Forfeited/cancelled		(456,539	)		7.44
Outstanding as of March 31, 2023		13,945,016		$	6.13		8.2	$	7,165
Vested and expected to vest as of March 31, 2023		13,853,950		$	6.09		8.2	$	7,165
Options exercisable as of March 31, 2023		5,614,768		$	6.68		6.7	$	5,192

Included in the table above are 2,443,800 options outstanding as of March 31, 2023 that were granted outside of the 2020 Plan. The grants were made pursuant to the NASDAQ inducement grant exception in accordance with NASDAQ Listing Rule 5635(c)(4).

The aggregate intrinsic value of options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common shares for those options that had exercise prices lower than the fair value of the Company’s common shares. There were no stock options exercised during the three months ended March 31, 2023. The intrinsic value for stock options exercised during the three months ended March 31, 2022 was $0.2 million. The weighted-average grant-date fair value of stock options granted during the three months ended March 31, 2023 and 2022 was $2.31 and $4.55 per share, respectively.

Restricted Stock Units

The following table summarizes the Company’s restricted stock unit activity since December 31, 2022:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2022		65,500	$	5.91
Granted		—		—
Vested		—		—
Forfeited		—		—
Unvested as of March 31, 2023		65,500	$	5.91

Share-based Compensation

Share-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Research and development expenses	$	1,138	$	885
General and administrative expenses		2,011		1,748
	$	3,149	$	2,633

As of March 31, 2023, total unrecognized share-based compensation expense related to unvested stock options was $27.4 million, which is expected to be recognized over a weighted-average period of 3.0 years. Additionally, as of March 31, 2023, the Company has unrecognized share-based compensation expense of $0.7 million related to unvested stock options with performance-based vesting conditions for which performance has not been deemed probable.

As of March 31, 2023, total unrecognized share-based compensation expense related to unvested restricted stock units was $0.3 million, which is expected to be recognized over a weighted-average period of 2.1 years.

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11.License Agreements and Asset Acquisitions

License Agreement with the Centre for Probe Development and Commercialization Inc.

In November 2015, the Company entered into a license agreement with the Centre for Probe Development and Commercialization Inc. (“CPDC”), a related party (see Note 16) (the “CPDC Agreement”). Under the CPDC Agreement, the Company was granted an exclusive, sublicensable, nontransferable, worldwide license under CPDC’s patent rights related to CPDC’s radiopharmaceutical linker technology to develop, market, make, use and sell certain products for all disease indications and uses in humans, whether diagnostic or therapeutic. The Company has the right to grant sublicenses of its rights. The CPDC Agreement was amended in 2017; however, there were no material changes to the terms of the CPDC Agreement. Also in 2017, the Company entered into a second license agreement with CPDC, under which the Company was granted an exclusive, sublicensable, worldwide license under CPDC’s patent rights related to certain CPDC radiopharmaceutical linker technology to develop, market, make, use and sell certain products for all disease indications and uses in humans. The Company has the right to grant sublicenses of its rights.

The Company has no obligations under any of the agreements with CPDC to make any milestone payments or to pay any royalties or annual maintenance fees to CPDC.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to CPDC or recognize any research and development expenses under the license agreements with CPDC.

License Agreement with ImmunoGen, Inc.

In December 2016, the Company entered into a license agreement with ImmunoGen, Inc. (“ImmunoGen”) (the “ImmunoGen Agreement”). Under the ImmunoGen Agreement, the Company was granted an exclusive, sublicensable, worldwide license under ImmunoGen’s patent rights to use, develop, manufacture and commercialize any radiopharmaceutical conjugate that includes a certain compound and any resulting commercialized products. The Company has the right to grant sublicenses of its rights.

Under the ImmunoGen Agreement, the Company paid an upfront fee of $0.2 million to ImmunoGen. In addition, the Company is obligated to make aggregate milestone payments to ImmunoGen of up to $15.0 million upon the achievement of specified development and regulatory milestones and of up to $35.0 million upon the achievement of specified sales milestones. The Company is also obligated to pay tiered royalties of a low to mid single-digit percentage based on annual net sales by the Company and any of its affiliates and sublicensees. Royalties will be paid by the Company on a country-by-country basis beginning upon the first commercial sale in such country until ten years following the date of the first commercial sale in the United States and five years following the date of the first commercial sale in all non-U.S. countries. In addition, the Company is responsible for all costs and expenses incurred related to the development, manufacture, regulatory approval and commercialization of all licensed products.

Prior to regulatory approval of a licensed product in any country, the Company has the right to terminate the agreement upon 90 days’ prior written notice to ImmunoGen. Upon receipt of its first regulatory approval of a licensed product in any country, the Company has the right to terminate the agreement upon 180 days’ prior written notice to ImmunoGen. If the Company or ImmunoGen fails to comply with any of its obligations or otherwise breaches the agreement, the other party may terminate the agreement. The ImmunoGen Agreement expires upon the expiration date of the last-to-expire royalty term.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to ImmunoGen or recognize any research and development expenses under the ImmunoGen Agreement.

Asset Acquisition from Rainier Therapeutics, Inc. and License Agreement with Genentech, Inc.

In March 2020 (the “Closing”), the Company and Rainier Therapeutics, Inc. (“Rainier”) entered into an asset acquisition agreement (the “Rainier Agreement”). Under the Rainier Agreement, the Company purchased all rights, title and interest to Rainier’s, and any of its affiliates’ and sublicensees’, patents and other tangible and intangible assets to perform research and to develop, manufacture and commercialize a specified compound of antibody molecules that bind to targets for the prevention, treatment and diagnosis of all diseases and conditions only using such compound as an antibody drug conjugate. The Company concluded to account for this purchase as an asset acquisition as substantially all of the fair value of the gross assets acquired was concentrated in a single identifiable asset, the license rights.

In connection with the asset acquisition, the Company paid an upfront fee of $1.0 million to Rainier and recognized this amount as research and development expense in the condensed consolidated statement of operations and comprehensive loss during the year ended December 31, 2020, as the IPR&D acquired had no alternative future use as of the acquisition date.

Unless the Rainier Agreement was terminated pursuant to its terms, which termination initially could not have occurred later than eight months following the Closing (the “Outside Date”), the Company was obligated to pay Rainier an additional amount of $3.5

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million and to issue 313,359 of the Company’s common shares on the Outside Date. Since the Rainier Agreement was not terminated by the Outside Date, as further described below, the Company is also obligated to make aggregate milestone payments to Rainier of up to $22.5 million and to issue up to 156,679 of the Company’s common shares upon the achievement of specified development and regulatory milestones and of up to $42.0 million upon the achievement of specified sales milestones.

In the event the Company enters into a transaction with a non-affiliated party relating to the license or sale of substantially all the Company’s rights to develop the specified compound of antibody molecules, the Company will be obligated to pay Rainier a specified percentage of the revenue from such transaction, in an amount ranging from 10% to 30%, based on how long after the Closing the transaction takes place.

The Rainier Agreement could have been terminated at any time prior to the Outside Date upon 30 days’ notice by the Company to Rainier or upon the mutual written consent of both parties. In October 2020, the Company and Rainier entered into a first amendment to the Rainier Agreement (the “First Amended Rainier Agreement”) to extend certain terms of the Rainier Agreement. Specifically, the Outside Date was amended such that termination may not occur later than eleven months following the Closing, or February 10, 2021 (the “Revised Outside Date”). In February 2021, the Company and Rainier entered into a second amendment to the First Amended Rainier Agreement, as amended (the “Second Amended Rainier Agreement”). Pursuant to the Second Amended Rainier Agreement, the Outside Date was further amended such that termination may not occur later than July 1, 2021, and such amendment was made in consideration for early payment of the additional $3.5 million owed to Rainier which the Company paid and recorded as research and development expense during the three months ended March 31, 2021. In May 2021, the Company notified Rainier of its intent to continue development of the asset and issued 313,359 of its common shares to Rainier on July 1, 2021. In August 2022, the Company announced the dosing of the first patient in a Phase 1 study of FPI-1966 and paid a $2.0 million milestone payment and issued 156,679 common shares to Rainier. In May 2023, the Company ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision.

During the three months ended March 31, 2023 and 2022, the Company did not recognize any research and development expense associated with the Second Amended Rainier Agreement.

In connection with the Rainier Agreement, in March 2020, the Company was assigned all of Rainier’s rights and obligations under an exclusive license agreement between BioClin Therapeutics, Inc. and Genentech, Inc. (“Genentech”) (the “Genentech License Agreement”). Pursuant to the Genentech License Agreement, the Company has an exclusive, worldwide, sublicensable license to make, use, research, develop, sell and import certain intellectual property and technology of Genentech relating to a specified antibody and any mutant antibody thereof (the “Licensed Antibodies”), including any products that contain a Licensed Antibody as an active ingredient (the “Products”), for all human uses.

Pursuant to the Genentech License Agreement, the Company is obligated to use commercially reasonable efforts to develop and commercialize at least one Product and the Company is solely responsible for the costs associated with the development, manufacturing, regulatory approval and commercialization of any Products. The manufacture of the antibody by any third-party contract development and manufacturing organization (“CDMO”) must be approved in advance by Genentech. Additionally, Genentech retains the right to use the Licensed Antibodies solely to research and develop molecules other than the Licensed Antibodies.

Under Genentech License Agreement, the Company is obligated to make aggregate milestone payments to Genentech of up to $44.0 million upon the achievement of specified sales milestones. The Company is also obligated to pay to Genentech tiered royalties of a mid to high single-digit percentage based on annual net sales by the Company, and any of its affiliates and sublicensees, for the specified compound of antibody molecules and of a mid to high single-digit percentage based on annual net sales by the Company, and any of its affiliates and sublicensees, for any other compound containing mutant antibody molecules of the specified compound. In addition, the Company is obligated to pay to Genentech royalties of a low single-digit percentage based on quarterly net sales in any country in which the specified compound is not covered by a valid patent claim, and those sales will not be subject to the tiered royalties described above. All royalties may be reduced if the Company obtains a license under a third-party patent that includes the specified compound. Royalties will be paid by the Company on a country-by-country basis beginning upon the first commercial sale in such country until the later of (i) ten years following the date of the first commercial sale of a Product or (ii) the date the specified compound is no longer covered by an enforceable patent. Upon the expiration of the royalty term, the Company will have a fully paid-up license.

The Company has the right to terminate the Genentech License Agreement upon written notice to Genentech if the Company determines in its sole discretion that development or commercialization of Products is not economically or scientifically feasible or appropriate. In addition, if the Company or Genentech fails to comply with any of its obligations or otherwise breaches the agreement, the other party may terminate the agreement. The Genentech License Agreement expires on the date on which all obligations under the agreement related to milestone payments or royalties have passed or expired. In May 2023, the Company ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision.

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During the three months ended March 31, 2023 and 2022, the Company did not make any payments to Genentech or recognize any research and development expenses under the Genentech License Agreement.

Collaboration Agreement and Supply Agreement with TRIUMF Innovations, Inc.

On December 10, 2020, the Company entered into a Collaboration Agreement and Supply Agreement (the “Collaboration Agreement”) with TRIUMF Innovations Inc. and TRIUMF JV (collectively, “the TRIUMF entities”) for the development, production and supply of actinium-225 (“225Ac”) to the Company. Under the Collaboration Agreement as executed in December 2020, the Company is obligated to pay the TRIUMF entities an aggregate of $5.0 million CAD upon the achievement of certain milestones. The Collaboration Agreement contemplated that the parties would enter into an amendment thereto to expand the scope of the project and provide for additional milestone payments.

As of March 31, 2023, the TRIUMF entities had achieved certain milestones under the Collaboration Agreement totaling $3.0 million CAD (equivalent to $2.3 million at the time of payment) which were paid during the year ended December 31, 2021 and are being recognized as research and development expense over the period of performance by the TRIUMF entities. During the three months ended March 31, 2023, the Company recognized the amortization of less than $0.1 million as research and development expense under the Collaboration Agreement. During the three months ended March 31, 2022, the Company did not recognize any research and development expense under the Collaboration Agreement.

As previously contemplated, on August 12, 2021, the parties amended the Collaboration Agreement in order to expand the scope of the project and the Company agreed to make an additional financial investment of up to $15.0 million CAD in connection with development of new process technology for the manufacture of 225Ac upon the achievement of certain milestones under an amendment to the Collaboration Agreement (the “Amended Collaboration Agreement”). In connection with the Amended Collaboration Agreement, the parties have formed a company (“NewCo”) to hold certain intellectual property derived from the collaboration. NewCo is jointly owned and managed by the Company and the TRIUMF entities and its purpose is to manufacture 225Ac for the research, clinical and commercial needs of the Company, and in certain circumstances, other third parties. The supply of 225Ac by NewCo to the Company shall be done under a commercial supply agreement, to be negotiated by NewCo and the Company. The Company is expected to purchase at least 50% of its annual 225Ac requirements from NewCo, unless NewCo is unable to supply such necessary quantities to the Company, in which case the Company may use other 225Ac suppliers to meet its commercial needs. As of March 31, 2023, there were no assets held by NewCo.

As of March 31, 2023, the TRIUMF entities had achieved certain milestones under the Amended Collaboration Agreement totaling $8.5 million CAD (equivalent to $6.6 million at the time of payment), of which $2.6 million was paid during the year ended December 31, 2022 and $3.9 million was paid during the year ended December 31, 2021. These amounts are being recognized as research and development expense over the period of performance by the TRIUMF entities. During the three months ended March 31, 2023 and 2022, the Company recognized the amortization of $0.3 million and $0.2 million, respectively, as research and development expense under the Amended Collaboration Agreement.

The Company recorded $2.1 million of milestone payments in prepaid expenses and other current assets and other non-current assets, respectively, as of March 31, 2023 based on its estimate of costs to be incurred over the 12 months following the balance sheet date for both the Collaboration Agreement and the Amended Collaboration Agreement.

Asset Acquisition from Ipsen Pharma SAS

In March 2021, the Company and Ipsen Pharma SAS (“Ipsen”) announced that the parties had entered into an asset purchase agreement (the “Ipsen Agreement”) whereby the Company agreed to acquire Ipsen’s intellectual property and assets related to IPN-1087, a small molecule targeting neurotensin receptor 1 (“NTSR1”), a protein expressed on multiple solid tumor types. The Company intends to combine its expertise and proprietary TAT platform with IPN-1087 to create an alpha-emitting radiopharmaceutical targeting solid tumors expressing NTSR1. The Company and Ipsen submitted a pre-merger notification and report form with the United States Federal Trade Commission and the Antitrust Division of the United States Department of Justice in accordance with the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”). The acquisition closed after completion of this antitrust review in April 2021. The Company concluded to account for this purchase as an asset acquisition as substantially all of the fair value of the gross assets acquired was concentrated in a single identifiable asset, the license rights.

Upon closing of the asset acquisition, the Company paid €0.6 million ($0.8 million at the date of payment) and issued an aggregate of 600,000 common shares to Ipsen under a share purchase agreement which was entered into concurrently with the Ipsen Agreement. Such common shares were issued pursuant to an exemption from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”). The Company is also obligated to pay Ipsen up to an additional €67.5 million upon the achievement of certain development and regulatory milestones; low single digit royalties on potential future net sales; and up to €350.0 million in net sales

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milestones, in each case, relating to products covered by the asset purchase agreement. The Company is responsible for paying to a third-party licensor up to a total of €70.0 million in development milestones for up to three indications and mid to low double-digit royalties on potential future net sales of products covered by the license agreement.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to Ipsen or recognize any research and development expenses under the Ipsen Agreement.

The Ipsen Agreement includes a royalty step down whereby royalties owed to Ipsen will be reduced by certain percentages not to exceed 50%, in the aggregate, of the royalty owed under certain circumstances relating to loss of patent exclusivity, loss of regulatory exclusivity or generics entering a market. Under the asset purchase agreement Ipsen has agreed not to develop a molecule that targets NTSR1 and combines at least one NTSR1 binding moiety and a radionuclide or cytotoxic agent until the earlier of (i) the seventh anniversary of the closing date or (ii) the date of data base lock after completion of the first phase 3 clinical trial for IPN-1087.

Agreement with Merck & Co.

In May 2021, the Company entered into an agreement with two subsidiaries of Merck & Co. (“Merck”). Pursuant to the agreement, Merck will provide to the Company, at no cost, its anti-PD-1 (programmed death receptor-1) therapy, KEYTRUDA® (pembrolizumab) to evaluate in combination with the Company’s lead candidate, FPI-1434. The planned Phase 1 combination trial will evaluate safety, tolerability and pharmacokinetics of FPI-1434 in combination with pembrolizumab and is expected to initiate approximately six to nine months after achieving the recommended Phase 2 dose in the ongoing Phase 1 study of FPI-1434 monotherapy. Under the agreement, the Company will sponsor, fund and conduct the combination trial in accordance with an agreed-upon protocol and Merck agreed to manufacture and supply its compound, at its cost and for no charge to the Company, for use in the clinical trial.

Collaboration and Supply Agreement with Niowave, Inc.

On June 9, 2022, the Company entered into a Collaboration and Supply Agreement with Niowave, Inc. (“Niowave”) (as amended from time to time, the “Niowave Agreement”) for the development, production and supply of 225Ac to the Company. Under the Niowave Agreement, the Company is obligated to pay Niowave an aggregate of $5.0 million upon the achievement of certain milestones.

On September 26, 2022, the Company entered into an amendment to the Niowave Agreement to amend certain terms of the Niowave Agreement, but made no change to the aggregate milestone payments owed under the Niowave Agreement.

As of March 31, 2023, Niowave had achieved certain milestones under the Niowave Agreement totaling $2.8 million, of which $1.9 million was paid during the three months ended March 31, 2023 and $0.9 million was paid during the year ended December 31, 2022. These amounts are being recognized as research and development expense over the period of performance by Niowave. During the three months ended March 31, 2023, the Company recognized $0.2 million as research and development expense under the Niowave Agreement.

RadioMedix Option and Asset Purchase Agreement

On November 14, 2022, the Company and RadioMedix, Inc. (“RadioMedix”) entered into an option and asset purchase agreement (the “RadioMedix Agreement”), pursuant to which RadioMedix granted to the Company the exclusive right, but not the obligation (the “RadioMedix Option”), to acquire certain of RadioMedix’s assets related to its on-going Phase 2 clinical trial evaluating 225Ac PSMA I&T (the “TATCIST Study”), a small molecule targeting prostate specific membrane antigens, expressed on prostate tumors. Such assets include, among other things, the investigational new drug application for the TATCIST Study, any third-party license held, or later acquired, by RadioMedix relating to 225Ac PSMA, and clinical and other data for the TATCIST Study (collectively, the “RadioMedix Assets”). The Company paid RadioMedix an option fee of $0.8 million upon the execution of the RadioMedix Agreement, which was recorded as research and development expense in its consolidated statements of operations and comprehensive loss during the year ended December 31, 2022.

On February 10, 2023, the Company notified RadioMedix of its decision to exercise the RadioMedix Option, paid the $1.5 million option exercise fee and closed the acquisition. During the three months ended March 31, 2023, the Company recognized the $1.5 million option exercise fee as research and development expense under the RadioMedix Agreement.

The alpha-emitting radiopharmaceutical being evaluated in the TATCIST Study is now referred to as FPI-2265.

Pursuant to the terms of the RadioMedix Agreement, the Company is obligated to pay RadioMedix (i) up to an additional $10.5 million upon the achievement of certain clinical and regulatory milestones, (ii) low single-digit royalties on potential future net sales, subject to specified reductions, and (iii) up to an additional $50.0 million in net sales milestones; in each case, relating to products

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covered by the RadioMedix Agreement. In addition, in the event RadioMedix or the Company is successful in obtaining certain intellectual property rights from a third party relating to 225Ac PSMA I&T, the amount of the clinical and regulatory milestone payments will be increased by up to an aggregate of $4.0 million and the royalty rates will increase but remain in the low- to mid-single digits.

Pursuant to the RadioMedix Agreement, the Company is prohibited from terminating or deprioritizing the development of 225Ac PSMA I&T, subject to specified exceptions. If the Company terminates or deprioritizes the development of 225-225Ac PSMA I&T, and does not sell, license or otherwise transfer its rights to a third-party within 12 months of such termination, the Company and RadioMedix are required to negotiate the return of 225Ac PSMA I&T and related assets to RadioMedix in return for specified reimbursement costs to the Company.

RadioMedix has agreed, subject to certain exceptions, not to develop or research a molecule that targets PSMA for a certain period of time following the closing date.

Additionally, the Company and RadioMedix have entered into manufacturing agreements under which RadioMedix will supply FPI-2265 to the Company for use in clinical trials. RadioMedix will not be the sole manufacturer to supply FPI-2265 for use in clinical trials.

12.Income Taxes

The Company is domiciled in Canada and is primarily subject to taxation in that country. During the three months ended March 31, 2023 and 2022, the Company recorded no income tax benefits for the net operating losses incurred or for the research and development tax credits generated in Canada in each period due to its uncertainty of realizing a benefit from those items. During the three months ended March 31, 2023, the Company recorded a tax benefit of less than $0.1 million primarily related to the Company’s foreign-derived intangible income deduction, partially offset by discrete share-based compensation items. Under the Tax Cuts and Jobs Act, taxpayers can no longer immediately expense qualified research and development expenditures. Taxpayers are now required to capitalize and amortize these costs over five years for research conducted within the United States or 15 years for research conducted abroad. As a result, the capitalization requirement increased the Company’s deferred tax assets and current tax liabilities, but also decreased its effective tax rate by increasing the foreign-derived intangible income deduction. During the three months ended March 31, 2022, the Company recorded a tax benefit of $0.1 million related to discrete share-based compensation items arising in the quarter, partially offset by income tax obligations of its operating company in the U.S., which typically generates a profit for tax purposes.

The Company’s tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate (“AETR”), adjusted for the effect of discrete items arising in that quarter. The impact of such inclusions could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings or losses versus annual projections. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter. For the three months ended March 31, 2023 and 2022, the Company excluded Canada from the calculation of the AETR as the Company anticipates an ordinary loss in this jurisdiction for which no tax benefit can be recognized.

The Company has evaluated the positive and negative evidence bearing upon its ability to realize its deferred tax assets both in the United States and Canada, which primarily consist of net operating loss carryforwards in Canada. The Company has considered its history of cumulative net losses in Canada, estimated future taxable income and prudent and feasible tax planning strategies and has concluded that it is more likely than not that the Company will not realize the benefits of its Canadian deferred tax assets. As a result, as of March 31, 2023 and December 31, 2022, the Company has recorded a full valuation allowance against its net deferred tax assets in Canada.

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13.Net Loss per Share

Net Loss per Share Attributable to Common Shareholders

Basic and diluted net loss per share attributable to common shareholders was calculated as follows (in thousands, except share and per share amounts):

	Three Months Ended March 31,
	2023			2022
Numerator:
Net loss	$	(24,291	)	$	(19,909	)
Denominator:
Weighted-average common shares outstanding—basic and diluted		53,775,985			43,170,076
Net loss per share attributable to common shareholders —basic    and diluted	$	(0.45	)	$	(0.46	)

The Company’s potentially dilutive securities, which include stock options and common share warrants, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted-average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common shareholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common shareholders for the periods indicated because including them would have had an anti-dilutive effect:

	Three Months Ended March 31,
	2023		2022
Options to purchase common shares		13,945,016		10,112,732
Unvested restricted stock units		65,500		—
Warrants to purchase common shares		196,120		—
		14,206,636		10,112,732

14.Leases

In August 2018, the Company entered into an operating lease for office space in Hamilton, Ontario. This lease was amended in September 2020 (“New Lease Commencement Date”) and expires in August 2030 with a termination option upon twelve months written notice any time after the fifth anniversary of the New Lease Commencement Date. If the termination option is not exercised, the Company may exercise a renewal option to extend the term for an additional five-year period through August 2035. As the Company is not reasonably certain to extend the lease beyond the allowable termination date, the lease term was determined to end in August 2026 for the purposes of measuring this lease.

In October 2019, the Company entered into an operating lease for office space in Boston, Massachusetts, which expires February 2026 and has no renewal options. In connection with entering into the original lease agreement, the Company issued a letter of credit of $1.5 million for the benefit of the landlord, which was reduced to $1.0 million during the three months ended March 31, 2023. As of March 31, 2023, $0.2 million and $0.8 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash. As of December 31, 2022, $0.2 million and $1.0 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash.

In March 2021, the Company entered into an amendment to its lease for office space in Boston, Massachusetts to expand the area under lease (“Expansion Premises”) and extend the term of the premises currently under lease (“Original Premises”) to align with the lease end date for the Expansion Premises. The additional rent for the Expansion Premises was determined to be commensurate with the additional right-of-use and is accounted for as a new operating lease that was recognized on the Company’s balance sheet since the Company was able to access the Expansion Premises upon execution of the amendment. The Company has made certain improvements to the Expansion Premises, for which the landlord has provided the Company an allowance of $0.2 million which was recorded as a reduction to operating lease right-of-use assets and operating lease liabilities as of December 31, 2021, and for which reimbursement was received during the year ended December 31, 2022. The rental payments for the Expansion Space commenced on January 1, 2022. The lease end date for the Original Premises and the Expansion Premises is April 30, 2027, with no option to extend the lease term. The

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lease modification for the extension of the Original Premises and the recognition of the Expansion Premises resulted in increases to the Company’s right-of-use asset balance, which was obtained in exchange for operating lease liabilities, of $0.9 million and $1.2 million, respectively.

In June 2021, the Company entered into a lease for a manufacturing facility in Hamilton, Ontario. The Company currently expects the rent for the manufacturing facility to commence in June 2023, approximately two months after the delivery date of the premises. The Company currently expects the lease end date for the manufacturing facility to be in June 2038. The lease has a five-year renewal option, which the Company is not reasonably certain to exercise and therefore was not included in the expected lease term. Upon execution of the lease in June 2021, the Company paid $2.5 million CAD (equivalent to $2.1 million at the time of payment) which represented an initial direct cost paid prior to the lease commencement date. The Company determined that the lease is an operating lease and commenced for accounting purposes on March 31, 2023, when the Company obtained access to the space for its’ intended use. On March 31, 2023, in connection with the lease commencement for accounting purposes, the Company recorded an operating right-of-use asset of $10.4 million (including the $2.1 million payment that was previously recorded to prepaid rent as a component of other non-current assets) obtained in exchange for an operating lease liability of $8.6 million.

On January 12, 2022, the Company entered into an operating lease for office space in Hamilton, Ontario. This lease was amended and commenced in February 2022 and is set to expire in August 2030. The lease has a five-year renewal option upon twelve months written notice prior to the expiration of the original term, which the Company is not reasonably certain to exercise and therefore was not included in the lease term for the purposes of measuring the lease. As a result, the Company recognized an operating lease liability and operating lease right-of-use asset of $0.3 million at lease commencement in February 2022.

From time to time, the Company enters into arrangements with CDMOs for the manufacture of materials for research and development purposes, including the manufacture of clinical trial materials. These contracts generally provide for certain non-cancellable obligations. The Company concluded that one such agreement contains an embedded lease as a controlled environment room at the facility is designated for the Company’s exclusive use during the term of the agreement. Upon the lease commencement in February 2023, the Company recorded an operating right-of-use asset of $2.2 million and corresponding operating lease liability of $1.5 million. The arrangement expires in March 2025.

The components of operating lease cost, which are included within operating expenses in the accompanying condensed consolidated statements of operations and comprehensive loss, are as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Operating lease cost	$	496	$	366
Variable lease cost		22		13
Total lease cost	$	518	$	379

The following table summarizes supplemental information for the Company’s operating leases:

	As of March 31,
	2023
Weighted-average remaining lease term (in years)		10.0
Weighted average discount rate		10.9	%
Cash paid for amounts included in the measurement of lease liabilities (in thousands)	$	437

As of March 31, 2023, the future maturities of operating lease liabilities are as follows (in thousands):

Year Ending December 31,
2023 (nine months)	$	4,038
2024		3,116
2025		2,578
2026		2,338
2027		1,326
Thereafter		13,429
Total lease payments	$	26,825
Less: imputed interest		(11,120	)
Total lease liabilities	$	15,705

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15.Commitments and Contingencies

Manufacturing Commitments

In January 2019, and as amended in September 2020, the Company entered into an agreement with CPDC, a related party (see Note 16), to manufacture clinical trial materials. In August 2022, this agreement was assigned and transferred to a third-party CDMO who is not a related party. As of March 31, 2023, the Company had non-cancelable minimum purchase commitments under the agreement totaling $0.4 million over the following twelve months.

In May 2019, the Company entered into an agreement with a third-party CDMO to manufacture clinical trial materials. As of March 31, 2023, the Company had non-cancelable minimum purchase commitments under the agreement totaling $0.5 million over the following twelve months.

On January 26, 2023, the Company entered into an agreement with another third-party CDMO to manufacture clinical trial materials. As of March 31, 2023, the Company had non-cancelable minimum purchase commitments under the agreement totaling $0.3 million over the following twelve months.

License Agreements

The Company has entered into license agreements with various parties under which it is obligated to make contingent and non-contingent payments (see Note 11).

Indemnification Agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and certain of its executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company is not currently aware of any indemnification claims and has not accrued any liabilities related to such obligations in its condensed consolidated financial statements as of March 31, 2023 or December 31, 2022.

Legal Proceedings

On February 13, 2023, the Company filed an Inter Partes Review (“IPR”) petition with the United States Patent and Trademark Office (“USPTO”) to challenge the validity of a certain issued U.S. Patent relating to FPI-2265. The Company cannot predict if the IPR will be instituted by the USPTO or, if instituted, the Company will prevail.

The Company is not a party to any other litigation and does not have contingency reserves established for any litigation liabilities. At each reporting date, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. The Company expenses as incurred the costs related to such legal proceedings.

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16.Related Party Transactions

The Company’s chief executive officer, founder and member of the board of directors, John Valliant, Ph.D., is a member of the board of directors at CPDC.

Besides the license agreements entered into with CPDC (see Note 11), the Company had also entered into a Master Services Agreement and a Supply Agreement with CPDC, under which CPDC provided services to the Company related to preclinical and manufacturing services, administrative support services and access to laboratory facilities. In connection with the Supply Agreement, the Company was obligated to pay CPDC an amount of $0.2 million per quarter, or $0.9 million in the aggregate per year, plus fees for materials, packaging and distribution of products supplied to the Company. The Company recognized expenses in connection with the services performed in the normal course of business under the Master Services Agreement and the Supply Agreement in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2022
Research and development expenses	$	990
General and administrative expenses		14
	$	1,004

In August 2022, CPDC transferred and assigned all agreements (including the Master Services Agreement and the Supply Agreement) other than the license agreements (see Note 11) with the Company to AtomVie, a third-party CDMO, who is not a related party. All terms and conditions of the agreements that were transferred and assigned will remain in full force and effect. CPDC’s performance obligations under these agreements will be undertaken by AtomVie.

During the three months ended March 31, 2022, the Company made payments to CPDC in connection with the services described above of $0.7 million. As of March 31, 2023 and December 31, 2022, there were no amounts due to CPDC by the Company in connection with the services described above.

In addition to costs incurred in connection with the services described above, the Company also reimbursed CPDC for purchases on the Company’s behalf from parties with which the Company did not have an account. During the three months ended March 31, 2022, the Company made payments to CPDC of less than $0.1 million for reimbursement of these pass-through costs.

During the three months ended March 31, 2022, the Company recorded $0.2 million of lab equipment purchased from CPDC which they acquired from third-party vendors on its behalf.

17.Geographical Information

The Company has operating companies in the United States and Canada. Information about the Company’s long-lived assets, consisting solely of property and equipment, net, by geographic region was as follows (in thousands):

	March 31, 2023		December 31, 2022
United States	$	433	$	465
Canada		4,708		4,166
	$	5,141	$	4,631

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18.Subsequent Events

Securities Purchase Agreement and Registration Rights Agreement

On May 10, 2023, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with the purchasers named therein (the “Investors”).

Pursuant to the Purchase Agreement, the Company agreed to sell an aggregate of 4,784,689 of its common shares (the “Shares”), no par value per share (the “Common Shares”), at a purchase price of $4.18 per share, to the Investors for approximately $20.0 million in aggregate gross proceeds (collectively, the “Offering”). The Offering is expected to close on or about May 15, 2023.

On May 10, 2023, in connection with the Purchase Agreement, the Company entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with the Investors. Pursuant to the Registration Rights Agreement, the Company agreed to prepare and file a registration statement with the Securities and Exchange Commission (the “SEC”) within 45 calendar days after the closing of the Offering for purposes of registering the resale of the Shares and any Common Shares as a dividend or other distribution with respect to the Shares. The Company agreed to use its commercially reasonable efforts to cause this registration statement to be declared effective by the SEC within 60 days after the filing of the registration statement.

The Offering was exempt from registration pursuant to Section 4(a)(2) of the Securities Act and Regulation D promulgated thereunder, as a transaction by an issuer not involving a public offering. The Investors have acquired the securities not with a view to or for sale in connection with any distribution thereof, and appropriate legends have been affixed to the securities issued in this transaction.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You should read the following discussion and analysis of our financial condition and results of operations together with our unaudited condensed consolidated financial statements and related notes appearing in Part I, Item I of this Quarterly Report on Form 10-Q and with our audited consolidated financial statements and notes thereto for the year ended December 31, 2022, included in our Annual Report on Form 10-K filed on March 16, 2023 with the U.S. Securities and Exchange Commission, or the SEC.

Some of the statements contained in this discussion and analysis or set forth elsewhere in this Quarterly Report on Form 10-Q, including information with respect to our plans and strategy for our business, constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. We have based these forward-looking statements on our current expectations and projections about future events. The following information and any forward-looking statements should be considered in light of factors discussed elsewhere in this Quarterly Report on Form 10-Q, particularly including those risks identified in Part II, Item 1A “Risk Factors” and our other filings with the SEC.

Our actual results and timing of certain events may differ materially from the results discussed, projected, anticipated, or indicated in any forward-looking statements. We caution you that forward-looking statements are not guarantees of future performance and that our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate may differ materially from the forward-looking statements contained in this Quarterly Report on Form 10-Q. Statements made herein are as of the date of the filing of this Form 10-Q with the SEC and should not be relied upon as of any subsequent date. Even if our results of operations, financial condition and liquidity, and the development of the industry in which we operate are consistent with the forward-looking statements contained in this Quarterly Report on Form 10-Q, they may not be predictive of results or developments in future periods. We disclaim any obligation, except as specifically required by law and the rules of the SEC, to publicly update or revise any such statements to reflect any change in our expectations or in events, conditions or circumstances on which any such statements may be based or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements.

Overview

We are a clinical-stage oncology company focused on developing next-generation radiopharmaceuticals as precision medicines. We have developed our Targeted Alpha Therapies, or TAT, platform to enable us to connect alpha particle emitting isotopes to various targeting molecules to selectively deliver the alpha particle payloads to tumors. Our TAT platform is underpinned by our ability to radiolabel various classes of targeting molecules (including antibodies, small molecules and peptides), our research and insights into the underlying chemistry and biology of alpha emitting radiopharmaceuticals, our differentiated capabilities in target identification, candidate generation, manufacturing and supply chain, our proprietary Fast-ClearTM linker technology used in conjunction with antibody-based targeting molecules, and development of imaging agents. We believe that our TATs have the potential to build on the successes of currently available radiopharmaceuticals and be broadly applicable across multiple targets and tumor types.

Our most advanced product candidate, FPI-2265, is a Phase 2 program acquired from RadioMedix, Inc., or RadioMedix, in February 2023 that targets prostate-specific membrane antigens, or PSMA, using actinium-225, or 225Ac. PSMA is a protein that is commonly found on the surface of normal prostate cells but is found in higher amounts on prostate cancer cells, as well as in lower amounts in other tissues, such as the small intestine and salivary glands. PSMA drives cancer invasion and metastases and is expressed in over 80% of men with prostate cancer, with higher PSMA expression being correlated to worse outcomes.

Pluvicto, a lutetium-177, or 177Lu, PSMA-targeted therapy, is currently a U.S. Food and Drug Administration, or FDA, approved radiopharmaceutical-based therapy to treat patients with metastatic castration resistant prostate cancer, or mCRPC. There are no alpha emitting PSMA-targeted radiopharmaceuticals currently approved by the FDA for the treatment of mCRPC. We believe that the challenges associated with producing and securing a supply of 225Ac have proven to be a barrier for the clinical advancement of PSMA-targeted alpha emitting therapies and, as a result, the majority of programs evaluating PSMA-targeted radiopharmaceuticals currently in development utilize a beta particle emitter.

Recent data from over 250 patients treated in investigator sponsored trials with 225Ac-PSMA agents, including both patients previously treated with 177Lu-PSMA radiopharmaceuticals (approximately 100 patients) and 177Lu-PSMA radiopharmaceutical therapy naïve patients, have shown compelling clinical data and biochemical response rates (including PSA50, the percentage of participants who had a prostate-specific antigen, or PSA, decline of at least 50 percent from baseline) and a tolerability profile that we believe supports further development of an 225Ac-based PSMA-targeted therapy. We believe our access to 225Ac and expertise developing alpha therapies provides an opportunity for us to begin treating patients refractory to lutetium-based PSMA therapies as well as an opportunity to move to earlier lines of therapy both as a monotherapy and in combination with other agents. Upon transfer of the investigational new drug application, or IND, from RadioMedix to us, we intend to expand the Phase 2 clinical trial across multiple sites. We expect to report preliminary data for the first 20-30 patients in this study, including safety and efficacy data, in the first quarter of 2024.

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Our second most advanced product candidate, FPI-1434, utilizes our Fast-Clear linker to connect a humanized monoclonal antibody that targets the insulin-like growth factor 1 receptor, or IGF-1R, with 225Ac. We are currently evaluating FPI-1434 as a monotherapy in the dose escalation portion of a Phase 1 clinical trial in patients with IGF-1R positive solid tumors to assess its safety, tolerability and pharmacokinetics as well as to identify the recommended Phase 2 dose. As part of the screening process, patients are administered the imaging analogue of FPI-1434, which utilizes the same linker and targeting molecule, but replaces 225Ac with the radioactive isotope indium-111, or 111In, and only those patients who meet predefined tumor uptake and dosimetry, and show organ radiation exposure within the limits of established standards for normal organ radiation tolerability, are advanced into the trial. In our ongoing Phase 1 trial, we are exploring various dosing levels of FPI-1434 in two dosing regimens: one with FPI-1434 alone, and another in which a small dose of cold antibody (naked IGF-1R antibody without the isotope) is administered prior to the imaging analogue and prior to each dose of FPI-1434. We are exploring the impact of administering the cold IGF-1R antibody prior to the imaging analogue and prior to each dose of FPI-1434 on the biodistribution, safety and tumor uptake. We refer to this dosing regimen as the “cold/hot” dosing regimen; we refer to the dosing regimen of FPI-1434 without pre-administration of the cold antibody as the “hot only” dosing regimen. The introduction of this “cold/hot” dosing regimen resulted, in part, from a cold antibody sub-study, or CASS, that was performed as part of the Phase 1 study, whereby a small amount of cold IGF-1R antibody was administered prior to administration of the imaging analogue only. In the CASS we treated five (5) patients at doses of 0.5 mg/kg and/or 1.5 mg/kg of cold IGF-1R antibody and saw, in general, an improved lesion uptake in most patients who received the cold IGF-1R antibody pre-administration and the lesion uptake was independent of anatomic location (including bone, mediastinum, lung, liver, and lymph nodes). Results at 0.5 mg/kg were generally more favorable than the 1.5 mg/kg dose of cold antibody. Imaging with the pre-administration of the cold antibody was well tolerated. As a result of the CASS data, we are prioritizing the cold/hot dosing regimen over the hot only dosing regimen. We are currently prioritizing patient enrollment into the “cold/hot” dosing regimen. We anticipate reporting Phase 1 molecular imaging, safety, and pharmacokinetics for both the “hot only” and “cold/hot” dosing regimens in June 2023. We expect to report the data across all dose escalation cohorts, including the first cohort of the “cold/hot” dosing regimen, which began after the “hot only” dosing regimen and the completion of the CASS.

In preclinical studies, FPI-1434 has been evaluated in combination with approved checkpoint inhibitors and DNA damage response inhibitors, or DDRis, such as poly (ADP-ribose) polymerase, or PARP, inhibitors. Based on preclinical data, we believe that the synergies observed with either class of agent could expand the addressable patient populations for FPI-1434 and allow for potential use in earlier lines of treatment. We anticipate initiation of a Phase 1 combination study with FPI-1434 and KEYTRUDA® (pembrolizumab) to occur six to nine months following determination of the recommended Phase 2 dose of FPI-1434 monotherapy in connection with a collaboration agreement executed in May 2021 with Merck.

We submitted INDs to the FDA for FPI-1966 and FPI-1967, the imaging analogue, for the treatment of cancers including head and neck and bladder cancers expressing fibroblast growth factor receptor 3, or FGFR3, in the second quarter of 2021 and announced FDA clearance of the INDs in July 2021. The Phase 1, non-randomized, open-label clinical trial of FPI-1966 in patients with solid tumors expressing FGFR3, intended to investigate safety, tolerability and pharmacokinetics and to establish the recommended Phase 2 dose, has been initiated with study sites open to patient recruitment. We dosed the first patient in August 2022. In May 2023, we ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision.

In November 2020, we announced a strategic collaboration agreement with AstraZeneca UK Limited, or AstraZeneca, to jointly discover, develop and commercialize next-generation alpha-emitting radiopharmaceuticals and combination therapies for the treatment of cancer. Under the terms of the collaboration agreement, we and AstraZeneca will jointly discover, develop and commercialize up to three novel TATs, which will utilize Fusion’s Fast-Clear linker technology platform with antibodies in AstraZeneca’s oncology portfolio. In January 2022, we announced the nomination of the first TAT candidate under the strategic collaboration agreement, a bispecific antibody owned by AstraZeneca radiolabeled with 225Ac utilizing our Fast-Clear linker technology, which we refer to as FPI-2068. FPI-2068 is a TAT designed to deliver 225Ac to various solid tumors that express epidermal growth factor receptor, or EGFR, and mesenchymal epithelial transition factor, or cMET. EGFR and cMET are both validated targets that are co-expressed in multiple tumor types, including head and neck squamous cell carcinoma, non-small cell lung cancer, colorectal cancer, and pancreatic ductal adenocarcinoma. In April 2023, we announced the clearance of INDs for FPI-2068 and its corresponding imaging analogue, FPI-2107, by the FDA. We plan to provide additional guidance on timelines for the FPI-2068 program following initial experience with patient screening in order to better predict the cadence of patient enrollment. In addition, we and AstraZeneca will exclusively explore up to five combination strategies involving our existing assets, including our FPI-1434 product candidate, and AstraZeneca therapeutics, for the treatment of various cancers. Each party will retain full rights to their respective assets.

In April 2021, we entered into an asset purchase agreement with Ipsen Pharma SAS, or Ipsen, to acquire Ipsen’s intellectual property and assets related to IPN-1087. IPN-1087 is a small molecule targeting neurotensin receptor 1, or NTSR1, a protein expressed on multiple solid tumor types. Using our TAT platform, we combined IPN-1087 with 225Ac to create an alpha-emitting radiopharmaceutical, FPI-2059, targeting solid tumors expressing NTSR1, including neuroendocrine differentiated prostate cancer, and colorectal, gastric and pancreatic cancers. The FDA cleared our IND for FPI-2059 and the corresponding imaging analogue, FPI-2058, in June 2022. Study initiation activities are ongoing in a Phase 1, non-randomized, open-label clinical trial of FPI-2059 in patients with

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solid tumors expressing NTSR1, intended to investigate safety, tolerability and pharmacokinetics and to establish the recommended Phase 2 dose. We plan to provide guidance on timelines for the FPI-2059 program following site activations and initial experience with patient screening and patient enrollment.

In January 2022, we entered into two separate strategic research collaborations to discover novel, peptide-based radiopharmaceuticals for the treatment of various solid tumors. Under the agreements, Fusion has global rights to develop and commercialize any peptides discovered under either collaboration.

Since our inception in 2014, we have devoted substantially all of our efforts and financial resources to organizing and staffing our company, business planning, raising capital, acquiring or discovering product candidates and securing related intellectual property rights and conducting discovery, research and development activities for our product candidates. We do not have any products approved for sale and have not generated any revenue from product sales. On June 30, 2020, we completed our initial public offering, or IPO, of our common shares and issued and sold 12,500,000 common shares at a public offering price of $17.00 per share, resulting in net proceeds of approximately $193.1 million after deducting underwriting fees and offering costs. Prior to our IPO, we funded our operations primarily with proceeds from sales of equity securities (including borrowings under a convertible promissory note, which converted into preferred shares). Through March 31, 2023, we had received net proceeds of $429.4 million from sales of equity securities (including borrowings under a convertible promissory note, which converted into preferred shares). In July 2021, we entered into an Open Market Sales AgreementSM, or the Sales Agreement, with Jefferies LLC to issue and sell up to $100.0 million of our common shares, from time to time during the term of the Sales Agreement, through an “at-the-market” equity offering program under which Jefferies LLC will act as our agent. As of March 31, 2023, we had received net proceeds of $9.2 million from sales of common shares under the Sales Agreement. In April 2022, we received net proceeds of $9.8 million from the funding of the Term A loan facility with Oxford Finance LLC, or Oxford. In September 2022, we received net proceeds of $24.9 million from the funding of the Term B loan facility with Oxford. In February 2023, we received $60.0 million in gross proceeds from a private placement financing in which we issued and sold 17,648,596 of our common shares at an offering price of $3.40 per share.

We have incurred significant operating losses since our inception. Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our current or future product candidates. Our net losses were $24.3 million and $19.9 million for the three months ended March 31, 2023 and 2022, respectively. As of March 31, 2023, we had an accumulated deficit of $306.2 million. We expect to continue to incur significant expenses and increasing operating losses for at least the next several years. We expect that our expenses and capital expenditure requirements will increase substantially in connection with our ongoing activities, particularly if and as we:

•continue our research and development efforts and submit biologics license applications, or BLAs, for our lead product candidate and submit INDs and BLAs and new drug applications, or NDAs, for our other biologic and drug product candidates;

•conduct preclinical studies and clinical trials for our current and future product candidates;

•continue to develop our library of proprietary linkers for our Fast-Clear technology;

•seek to identify additional product candidates;

•acquire or in-license other product candidates, targeting molecules and technologies;

•continue strategic investments in manufacturing and supply chain capabilities, including the production and supply of 225Ac;

•add operational, financial and management information systems and personnel, including personnel to support the development of our product candidates;

•hire and retain additional personnel, such as clinical, quality control, scientific, commercial and administrative personnel;

•seek marketing approvals for any product candidates that successfully complete clinical trials;

•establish a sales, manufacturing, marketing and distribution infrastructure and scale-up manufacturing capabilities, whether alone or with third parties, to commercialize any product candidates for which we may obtain regulatory approval, if any;

•expand, maintain and protect our intellectual property portfolio; and

•operate as a public company.

We will not generate revenue from product sales unless and until we successfully complete clinical development and obtain regulatory approval for our product candidates. If we obtain regulatory approval for any of our product candidates and do not enter into a commercialization partnership, we expect to incur significant expenses related to developing our internal commercialization capabilities to support product sales, marketing and distribution.

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As a result, we will need substantial additional funding to support our continuing operations and pursue our growth strategy. Until such time as we can generate significant revenue from product sales, if ever, we expect to finance our operations through the sale of equity, debt financings or other capital sources, which may include collaborations with other companies or other strategic transactions. We may not be able to raise additional funds or enter into such other agreements or arrangements when needed on favorable terms, or at all. If we fail to raise capital or enter into such agreements as and when needed, we would have to significantly delay, reduce or eliminate the development and commercialization of one or more of our product candidates or delay our pursuit of potential in-licenses or acquisitions.

Because of the numerous risks and uncertainties associated with product development, we are unable to predict the timing or amount of increased expenses or when or if we will be able to achieve or maintain profitability. Even if we are able to generate product sales, we may not become profitable. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our operations at planned levels and be forced to reduce or terminate our operations.

As of March 31, 2023, we had cash, cash equivalents and investments of $221.2 million. We believe that our existing cash, cash equivalents and investments will be sufficient to fund our operating expenses and capital expenditure requirements into the first quarter of 2025. Following the May 2023 announcement to cease further clinical development of our FPI-1966 program and $20.0 million in gross proceeds from our private placement which is expected to close in May 2023, we believe that our cash, cash equivalents and investments will be sufficient to fund our operating expenses and capital expenditure requirements into the second quarter of 2025.

Impacts of COVID-19 and Market Conditions on Our Business

We believe our financial results for the three months ended March 31, 2023 and year ended December 31, 2022 were not significantly impacted by the COVID-19 pandemic. We believe our hybrid and remote working arrangements have had limited impact on our ability to maintain internal operations during the three months ended March 31, 2023 and year ended December 31, 2022. Further, disruption of global financial markets and a recession or market correction, including as a result of the COVID-19 pandemic, the ongoing military conflict between Russia and Ukraine and the related sanctions imposed against Russia, and other global macroeconomic factors such as inflation and the recent banking industry volatility, could reduce our ability to access capital, which could, in the future, negatively affect our business and the value of our common shares.

Components of Results of Operations

Revenue from Product Sales

To date, we do not have any approved product candidates and as such, have not generated any revenue from product sales, and we do not expect to generate any revenue from the sale of products for the foreseeable future. If our development efforts for our current or future product candidates are successful and result in regulatory approval, we may generate revenue in the future from product sales. We cannot predict if, when or to what extent we will generate revenue from the commercialization and sale of our product candidates. We may never succeed in obtaining regulatory approval for any of our product candidates.

Collaboration Revenue

On October 30, 2020, we and AstraZeneca entered into a strategic collaboration agreement, or the AstraZeneca Agreement, pursuant to which we and AstraZeneca will work to jointly discover, develop and commercialize next-generation alpha-emitting radiopharmaceuticals and combination therapies for the treatment of cancer globally by leveraging our TAT platform and expertise in radiopharmaceuticals with AstraZeneca’s leading portfolio of antibodies and cancer therapeutics, including DDRis. The AstraZeneca Agreement consists of two distinct collaboration programs: novel TATs and combination therapies. In January 2022, we announced the nomination of the first novel TAT candidate, a bispecific antibody owned by AstraZeneca radiolabeled with 225Ac utilizing our Fast-Clear linker technology. Each party retains full ownership over its existing assets.

We received an upfront payment of $5.0 million from AstraZeneca in December 2020 associated with the combination therapies program. AstraZeneca will fully fund all research and development activities for the combination strategies, until such point as we may opt-in to the clinical development activities. We also have the right to opt-out of clinical development activities relating to these combination therapies. In such instance, we will be responsible for repaying our share of the development costs via a royalty on the additional combination sales only if our drug is approved on the basis of clinical development solely conducted by AstraZeneca, in which case the royalty payments shall also include a variable risk premium based on the number of our product candidates that have

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received regulatory approval at that time. We are eligible to receive future payments of up to $40.0 million, including those for the achievement of certain clinical milestones and exclusivity fees.

We determined the research and development activities associated with the combination therapies, or the Combination Therapies Collaboration, are a key component of our central operations and AstraZeneca has contracted with us to obtain goods and services which are an output of our ordinary activities in exchange for consideration. Further, we do not share the risks and rewards of the underlying research activities making AstraZeneca a customer for the Combination Therapies Collaboration which falls within the scope of ASC 606, Revenue from Contracts with Customers, or ASC 606.

Under ASC 606 we account for (i) the license we conveyed to AstraZeneca with respect to certain intellectual property and (ii) the obligations to perform research and development services as part of the Combination Therapies Collaboration as a single performance obligation under the AstraZeneca Agreement. We recognize revenue using the cost-to-cost method, which we believe best depicts the transfer of control to the customer. Under the cost-to-cost method, the extent of progress towards completion is measured based on the ratio of actual costs incurred to the total estimated costs expected upon satisfying the identified performance obligation. Under this method, revenue is recorded as a percentage of the estimated transaction price based on the extent of progress towards completion. We recognize adjustments in revenue for changes in the estimated extent of progress towards completion under the cumulative catch-up method. Under this method, the impact of this adjustment on revenue recorded to date is recognized in the period the adjustment is identified.

During the three months ended March 31, 2023 and 2022, we recognized less than $0.1 million and $0.6 million, respectively, in collaboration revenue under the AstraZeneca Agreement in the condensed consolidated statement of operations and comprehensive loss.

Operating Expenses

Research and Development Expenses

Research and development expenses consist primarily of costs incurred in connection with the discovery and development of our product candidates. These expenses include:

•employee-related expenses, including salaries, related benefits and share-based compensation expense, for employees engaged in research and development functions;

•expenses incurred in connection with the preclinical and clinical development of our product candidates, including under agreements with third parties, such as consultants and contract research organizations, or CROs;

•the cost of manufacturing drug products for use in our preclinical studies and clinical trials, including under agreements with third parties, such as consultants and contract development and manufacturing organizations, or CDMOs;

•facilities, depreciation and other expenses, which include direct or allocated expenses for rent, maintenance of facilities and insurance;

•costs related to compliance with regulatory requirements; and

•payments made in connection with third-party licensing agreements and asset acquisitions of incomplete technology.

We expense research and development costs as incurred. Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. Such amounts are recognized as an expense when the goods have been delivered or the services have been performed, or when it is no longer expected that the goods will be delivered or the services rendered. Upfront payments under license agreements are expensed upon receipt of the license, and annual maintenance fees under license agreements are expensed in the period in which they are incurred. Milestone payments under license agreements are accrued, with a corresponding expense being recognized, in the period in which the milestone is determined to be probable of achievement and the related amount is reasonably estimable.

In connection with the AstraZeneca Agreement, we and AstraZeneca are both active participants in the research and development activities of the collaboration and we are exposed to significant risks and rewards that are dependent on commercial success of the activities of the arrangement with respect to the novel TATs program, or the Novel TATs Collaboration. As this arrangement falls within the scope of ASC 808, Collaborative Arrangements, or ASC 808, all payments received or amounts due from AstraZeneca for reimbursement of shared costs are accounted for as an offset to research and development expense. For the three months ended March 31, 2023 and 2022, the Company incurred $1.6 million and $0.7 million, respectively, in research and development expenses relating to the Novel TATs Collaboration which was offset by $0.6 million and $0.3 million, respectively, in amounts due from AstraZeneca for reimbursement of shared costs.

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Our direct research and development expenses are tracked on a program-by-program basis for our product candidates and consist primarily of external costs, such as fees paid to outside consultants, CROs, CDMOs and research laboratories in connection with our preclinical development, process development, manufacturing and clinical development activities. Our direct research and development expenses by program also include fees incurred under third-party license agreements. We do not allocate employee costs and costs associated with our discovery efforts, laboratory supplies and facilities, including depreciation or other indirect costs, to specific programs because these costs are deployed across multiple programs and our TAT platform and Fast-Clear linker technology and, as such, are not separately classified. We use internal resources primarily to conduct our research and discovery activities as well as for managing our preclinical development, process development, manufacturing and clinical development activities. These employees work across multiple programs and our technology platform and, therefore, we do not track these costs by program.

Research and development activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. As a result, we expect that our research and development expenses will increase substantially over the next several years as we complete a Phase 2 clinical trial of FPI-2265 in patients with mCRPC, a Phase 1 clinical trial of FPI-1434 as a monotherapy in patients with solid tumors expressing IGF-1R, complete preclinical development and pursue initial stages of clinical development of our FPI-1434 combination therapies, complete a Phase 1 clinical trial of FPI-2059 as a monotherapy in patients with solid tumors expressing NTSR1, complete a Phase 1 clinical trial of FPI-2068 as a monotherapy in patients with solid tumors expressing EGFR and cMET, and continue to progress our other early-stage programs.

The successful development and commercialization of our product candidates are highly uncertain. At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the preclinical and clinical development of any of our product candidates. This is due to the numerous risks and uncertainties associated with product development, including the following:

•timely completion of our preclinical studies and our current and future clinical trials, which may be significantly slower or more costly than we currently anticipate and will depend substantially upon the performance of third-party contractors;

•our ability to complete IND-enabling studies and successfully submit INDs or comparable applications to allow us to initiate clinical trials for our current or any future product candidates;

•whether we are required by the FDA or similar foreign regulatory authorities to conduct additional clinical trials or other studies beyond those planned to support the approval and commercialization of our product candidates or any future product candidates;

•our ability to demonstrate to the satisfaction of the FDA or other foreign regulatory authorities the safety, potency, purity and acceptable risk-to-benefit profile of our product candidates or any future product candidates;

•the prevalence, duration and severity of potential side effects or other safety issues experienced with our product candidates or future product candidates, if any;

•the timely receipt of necessary marketing approvals from the FDA or similar foreign regulatory authorities;

•the willingness of physicians, operators of clinics and patients to utilize or adopt any of our product candidates or future product candidates as potential cancer treatments;

•our ability and the ability of third parties with whom we contract to manufacture adequate clinical supplies of our product candidates or any future product candidates, remain in good standing with regulatory authorities and develop, validate and maintain manufacturing processes that are compliant with current good manufacturing practices; and

•our ability to establish and enforce intellectual property rights in and to our product candidates or any future product candidates.

A change in the outcome of any of these variables with respect to the development of our product candidates could significantly change the costs and timing associated with the development of these product candidates. We may elect to discontinue, delay or modify clinical trials of some product candidates or focus on others. In addition, we may never succeed in obtaining regulatory approval for any of our product candidates.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries and related costs, including share-based compensation, for personnel in executive, finance and administrative functions. General and administrative expenses also include direct and allocated facility-related costs as well as professional fees for legal, patent, consulting, investor and public relations, accounting and audit services.

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We anticipate that our general and administrative expenses will increase in the future as we increase our headcount to support our continued research activities and development of our product candidates and technology platform. We also anticipate that we will incur increased accounting, audit, legal, regulatory, compliance and director and officer insurance costs as well as investor and public relations expenses associated with our continued growth as a public company.

Other Income (Expense)

Interest Income

Interest income consists primarily of interest income earned on our cash, cash equivalents and investment balances and the amortization of premiums or accretion of discounts associated with our investments. We expect that our interest income will fluctuate based on the timing and ability to raise additional funds as well as the amount of expenditures for the clinical development of our product candidates and ongoing business operations.

Interest Expense

Interest expense consists of interest owed on outstanding borrowings under our loan and security agreement with Oxford, as well as amortization of debt discount.

Other Income (Expense), Net

Other income (expense), net primarily consists of foreign currency transaction gains and losses as well as miscellaneous income and expense unrelated to our core operations, including government assistance.

Income Taxes

We are domiciled in Canada and are primarily subject to taxation in that country. Since our inception, we have recorded no income tax benefits for the net operating losses incurred or for the research and development tax credits generated in each year by our operations in Canada due to our uncertainty of realizing a benefit from those items. As of December 31, 2022, we had $170.2 million of Canadian net operating loss carryforwards that begin to expire in 2035. In addition, as of December 31, 2022, we had $6.4 million of Canadian tax credit carryforwards that begin to expire in 2037 as well as Canadian capitalized research and development expenditures of $35.5 million that can be carried forward indefinitely. We have recorded a full valuation allowance against our Canadian net deferred tax assets as of December 31, 2022.

In prior periods, we have recorded an insignificant amount of income tax provision or benefit for our operating company in Canada and our operating company in the U.S., which typically generates a profit for tax purposes.

Results of Operations

Comparison of the Three Months Ended March 31, 2023 and 2022

The following table summarizes our results of operations for the three months ended March 31, 2023 and 2022 (in thousands):

	Three Months Ended March 31,
	2023			2022			Change
Collaboration revenue	$	28		$	585		$	(557	)
Operating expenses:
Research and development		15,877			12,661			3,216
General and administrative		9,006			8,449			557
Total operating expenses		24,883			21,110			3,773
Loss from operations		(24,855	)		(20,525	)		(4,330	)
Other income (expense):
Interest income		1,921			83			1,838
Interest expense		(1,223	)		—			(1,223	)
Other (expense) income, net		(145	)		478			(623	)
Total other income, net		553			561			(8	)
Loss before benefit for income taxes		(24,302	)		(19,964	)		(4,338	)
Income tax benefit		11			55			(44	)
Net loss	$	(24,291	)	$	(19,909	)	$	(4,382	)

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Collaboration Revenue

Collaboration revenue was less than $0.1 million and $0.6 million for the three months ended March 31, 2023 and 2022, respectively, for services provided under the AstraZeneca Agreement.

Research and Development Expenses

	Three Months Ended March 31,
	2023		2022		Change
	(in thousands)
Direct research and development expenses by program:
FPI-1434	$	2,128	$	3,406	$	(1,278	)
FPI-1966		1,165		1,001		164
FPI-2059		836		—		836
FPI-2265		2,431		—		2,431
Platform development and unallocated research and development expenses:
TAT platform		2,999		2,659		340
Personnel related (including share-based compensation)		5,762		5,000		762
Other		556		595		(39	)
Total research and development expenses	$	15,877	$	12,661	$	3,216

Research and development expenses were $15.9 million for the three months ended March 31, 2023, compared to $12.7 million for the three months ended March 31, 2022. The increase of $3.2 million was primarily due to an increase of $2.2 million in direct costs related to our FPI-1434, FPI-1966, FPI-2059 and FPI-2265 product candidates, and an increase of $1.1 million in platform development and unallocated research and development costs, described below. We have incurred program expenses for FPI-2265 and FPI-2059 during the three months ended March 31, 2023. FPI-2265 and FPI-2059 are TATs designed to target and deliver 225Ac to tumor sites expressing PSMA and NTSR1, respectively. We acquired FPI-2265, a Phase 2 product candidate in February 2023 from RadioMedix, Inc., and in June 2022, we announced FDA clearance of our IND application for FPI-2059. Direct costs of $2.4 million for the three months ended March 31, 2023 for our FPI-2265 product candidate are related to the ongoing Phase 2 clinical trial of FPI-2265, including a $1.5 million payment under the RadioMedix Agreement. Direct costs of $0.8 million for the three months ended March 31, 2023 for our FPI-2059 product candidate are related to the initiation of a Phase 1 clinical trial of FPI-2059. The decrease in FPI-1434 of $1.3 million is primarily due to a decrease in manufacturing-related costs for our Phase 1 clinical trial of FPI-1434. In May 2023, we ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision. We expect to incur wind down costs associated with this program.

Platform development and unallocated research and development expenses were $9.3 million for the three months ended March 31, 2023, compared to $8.3 million for the three months ended March 31, 2022. The increase of $1.1 million was due to an increase of $0.8 million in personnel-related costs and an increase of $0.3 million in costs related to our TAT platform, partially offset by a decrease in other costs of $0.1 million. Personnel-related costs for the three months ended March 31, 2023 and 2022 included share-based compensation of $1.1 million and $0.9 million, respectively. The increase in TAT platform costs was primarily due to increased external costs for preclinical studies and activities associated with our advancement of our TAT platform.

General and Administrative Expenses

General and administrative expenses were $9.0 million for the three months ended March 31, 2023, compared to $8.4 million for the three months ended March 31, 2022. The increase of $0.6 million was primarily due to a $0.6 million increase in professional fees and a $0.5 million increase in personnel-related costs, offset by a $0.6 million decrease in corporate and other costs. The increase in professional fees was primarily due to increased corporate and patent related legal expenses. The increase in personnel-related costs was primarily due to the hiring of additional personnel in our general and administrative functions, including in finance, legal, human resources and business development. Personnel-related costs for the three months ended March 31, 2023 and 2022 included share-based compensation of $2.0 million and $1.7 million, respectively. The decrease in corporate and other costs was primarily due to decreased general corporate, director and officer insurance expenses.

Other Income (Expense)

Interest Income. Interest income for the three months ended March 31, 2023 and 2022 was $1.9 million and $0.1 million, respectively. The increase of $1.8 million was primarily due to increases in interest income driven by increased market rates.

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Interest Expense. Interest expense for the three months ended March 31, 2023 was $1.2 million. Interest expense consists of interest owed on outstanding borrowings under our loan and security agreement with Oxford, as well as amortization of debt discount.

Other Income (Expense), Net. Other income (expense), net for the three months ended March 31, 2023 and 2022 was $(0.1) million and $0.5 million, respectively. The net decrease of $0.6 million was primarily related to net realized and unrealized foreign exchange losses incurring during the three months ended March 31, 2023.

Income Tax Benefit

The income tax benefit was less than $0.1 million and $0.1 million for the three months ended March 31, 2023 and 2022, respectively.

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Liquidity and Capital Resources

Since our inception in 2014, we have not generated any revenue from product sales, and have incurred significant operating losses and negative cash flows from our operations. On June 30, 2020, we completed our IPO of our common shares and issued and sold 12,500,000 common shares at a public offering price of $17.00 per share, resulting in net proceeds of approximately $193.1 million after deducting underwriting fees and offering costs. Prior to our IPO, we funded our operations primarily with proceeds from sales of equity securities (including borrowings under a convertible promissory note, which converted into preferred shares). From our inception through March 31, 2023, we had received net proceeds of $429.4 million from sales of equity securities (including borrowings under a convertible promissory note, which converted into preferred shares). In July 2021, we entered into the Sales Agreement with Jefferies LLC to issue and sell our common shares up to $100.0 million in gross proceeds, from time to time during the term of the Sales Agreement, through an “at-the-market” equity offering program under which Jefferies LLC will act as our agent and/or principal, or the ATM Facility. The ATM Facility provides that Jefferies LLC will be entitled to compensation for its services in an amount of up to 3.0% of the gross proceeds of any shares sold under the ATM Facility. We have no obligation to sell any shares under the ATM Facility and may, at any time, suspend solicitation and offers under the Sales Agreement. As of March 31, 2023, we had received net proceeds of $9.2 million from sales of common shares under the Sales Agreement. In April 2022, we received net proceeds of $9.8 million from the funding of the Term A loan facility with Oxford. In September 2022, we received net proceeds of $24.9 million from the funding of the Term B loan facility with Oxford. In February 2023, we received $60.0 million in gross proceeds from a private placement financing in which we issued and sold 17,648,596 of our common shares at an offering price of $3.40 per share.

Cash Flows

The following table summarizes our sources and uses of cash for each of the periods presented:

	Three Months Ended March 31,
	2023			2022
Net cash used in operating activities	$	(25,435	)	$	(14,971	)
Net cash (used in) provided by investing activities		(24,528	)		19,131
Net cash provided by financing activities		59,515			1,709
Net increase in cash, cash equivalents and restricted cash	$	9,552		$	5,869

Operating Activities

During the three months ended March 31, 2023, operating activities used $25.4 million of cash, resulting from our net loss of $24.3 million and net cash used in changes in our operating assets and liabilities of $3.5 million, partially offset by non-cash charges of $2.4 million. Net cash used in changes in our operating assets and liabilities for the three months ended March 31, 2023 primarily consisted of a $2.7 million increase in prepaid expenses and other current assets, a $0.7 million decrease in accounts payable and a $0.3 million decrease in operating lease liabilities.

During the three months ended March 31, 2022, operating activities used $15.0 million of cash, resulting from our net loss of $19.9 million, partially offset by non-cash charges of $3.0 million and net cash provided by changes in our operating assets and liabilities of $1.9 million. Net cash provided by changes in our operating assets and liabilities for the three months ended March 31, 2022 primarily consisted of a $2.7 million decrease in prepaid expenses and other current assets and a $0.4 million increase in accrued expenses, partially offset by a $0.6 million decrease in accounts payable, a $0.4 million decrease in deferred revenue and a $0.3 million decrease in operating lease liabilities.

Investing Activities

During the three months ended March 31, 2023, net cash used in investing activities was $24.5 million, consisting of purchases of investments of $62.4 million and purchases of property and equipment of $1.2 million, offset by maturities of investments of $39.1 million.

During the three months ended March 31, 2022, net cash provided by investing activities was $19.1 million, consisting of maturities of investments of $37.1 million, offset by purchases of investments of $17.3 million and purchases of property and equipment of $0.6 million.

Financing Activities

During the three months ended March 31, 2023, net cash provided by financing activities was $59.5 million, consisting of $60.0 million in gross proceeds from the issuance of common shares in connection with our February 2023 private placement financing and $3.4 million in proceeds from the issuance of common shares from our ATM Facility, net of issuance costs, offset by $3.9 million in offering costs paid in connection with our February 2023 private placement financing.

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During the three months ended March 31, 2022, net cash provided by financing activities was $1.7 million, consisting of $1.6 million in proceeds from the issuance of common shares from our ATM Facility, net of issuance costs, and $0.1 million in proceeds from the issuance of common shares upon exercise of stock options.

Funding Requirements

We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance the preclinical activities and clinical trials of our product candidates in development. In addition, we expect to incur additional costs associated with operating as a public company. The timing and amount of our operating expenditures will depend largely on:

•the scope, progress, results and costs of researching and developing our product candidates;

•the timing of, and the costs involved in, obtaining marketing approvals for our current and future product candidates;

•the number of future product candidates and potential additional indications that we may pursue and their development requirements;

•the cost of manufacturing our product candidates for clinical trials in preparation for regulatory approval and in preparation for commercialization;

•the cost of strategic investments in manufacturing and supply chain, in particular for the production and supply of 225Ac;

•the cost and availability of 225Ac or any other medical isotope we may incorporate into our product candidates;

•if approved, the costs of commercialization activities for any approved product candidate to the extent such costs are not the responsibility of any future collaborators, including the costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

•subject to receipt of regulatory approval and revenue, if any, received from commercial sales for any approved indications for any of our product candidates;

•the extent to which we enter into collaborations with third parties, in-license or acquire rights to other products, product candidates or technologies;

•our headcount growth and associated costs as we expand our research and development capabilities and establish a commercial infrastructure;

•the costs of preparing, filing and prosecuting patent applications and maintaining and protecting our intellectual property rights, including enforcing and defending intellectual property related claims; and

•the costs of operating as a public company.

In July 2021, we entered into the Sales Agreement to issue and sell our common shares up to $100.0 million in gross proceeds, from time to time during the term of the Sales Agreement, through an “at-the-market” equity offering program. As of March 31, 2023, we had received net proceeds of $9.2 million from sales of common shares under the Sales Agreement.

In April 2022, we received net proceeds of $9.8 million from the funding of the Term A loan facility with Oxford. In September 2022, we received net proceeds of $24.9 million from the funding of the Term B loan facility with Oxford.

In February 2023, we received $60.0 million in gross proceeds from a private placement financing in which we issued and sold 17,648,596 of our common shares at an offering price of $3.40 per share.

We believe that our existing cash, cash equivalents and investments as of March 31, 2023 will be sufficient to fund our operating expenses and capital expenditure requirements into the first quarter of 2025. Following the May 2023 announcement to cease further clinical development of our FPI-1966 program and $20.0 million in gross proceeds from our private placement which is expected to close in May 2023, we believe that our cash, cash equivalents and investments will be sufficient to fund our operating expenses and capital expenditure requirements into the second quarter of 2025. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings, debt financings, collaborations, strategic alliances, and marketing, distribution or licensing arrangements with third parties. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest may be materially diluted, and the terms of such securities could include liquidation or other preferences that adversely affect your rights as a common shareholder. Debt financing and preferred equity financing, if available, may involve agreements that include restrictive

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covenants that limit our ability to take specific actions, such as incurring additional debt, making capital expenditures, creating liens, redeeming shares or declaring dividends. If we raise funds through collaborations, strategic alliances, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates, or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings or other arrangements when needed, we would be required to delay, limit, reduce or terminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Critical Accounting Policies and Significant Judgments and Estimates

Our condensed consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States. The preparation of our condensed consolidated financial statements and related disclosures requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, costs and expenses, and the disclosure of contingent assets and liabilities in our condensed consolidated financial statements. We base our estimates on historical experience, known trends and events and various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.

While our significant accounting policies are described in more detail in Note 2 to our condensed consolidated financial statements, we believe that the following accounting policies are those most critical to the judgments and estimates used in the preparation of our condensed consolidated financial statements.

Collaborative Arrangements

We consider the nature and contractual terms of arrangements and assess whether an arrangement involves a joint operating activity pursuant to which we are an active participant and are exposed to significant risks and rewards dependent on the commercial success of the activity. If we are an active participant and are exposed to significant risks and rewards dependent on the commercial success of the activity, we account for such arrangement as a collaborative arrangement under ASC 808. ASC 808 describes arrangements within its scope and considerations surrounding presentation and disclosure, with recognition matters subjected to other authoritative guidance, in certain cases by analogy.

For arrangements determined to be within the scope of ASC 808 where a collaborative partner is not a customer for certain research and development activities, we account for payments received for the reimbursement of research and development costs as a contra-expense in the period such expenses are incurred. This reflects the joint risk sharing nature of these activities within a collaborative arrangement. We classify payments owed or receivables recorded as other current liabilities or prepaid expenses and other current assets, respectively, in our consolidated balance sheets.

If payments from the collaborative partner to us represent consideration from a customer in exchange for distinct goods and services provided, then we account for those payments within the scope of ASC 606.

Revenue Recognition

In accordance with ASC 606, we recognize revenue when a customer obtains control of promised goods or services, in an amount that reflects the consideration which we expect to receive in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, we perform the following five steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations within the contract and (v) recognize revenue when (or as) we satisfy a performance obligation.

We only apply the five-step model to contracts when we determine that it is probable we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer.

At contract inception, once the contract is determined to be within the scope of ASC 606, we assess the goods or services promised within the contract to determine whether each promised good or service is a performance obligation. The promised goods or services in our arrangements typically consist of a license to our intellectual property and/or research and development services. We may provide customers with options to additional items in such arrangements, which are accounted for separately when the customer elects to exercise such options, unless the option provides a material right to the customer. Performance obligations are promises in a contract to transfer a distinct good or service to the customer that (i) the customer can benefit from on its own or together with other readily available resources, and (ii) is separately identifiable from other promises in the contract. Goods or services that are not individually distinct performance obligations are combined with other promised goods or services until such combined group of promises meet the requirements of a performance obligation.

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We determine transaction price based on the amount of consideration we expect to receive for transferring the promised goods or services in the contract. Consideration may be fixed, variable, or a combination of both. At contract inception for arrangements that include variable consideration, we estimate the probability and extent of consideration we expect to receive under the contract utilizing either the most likely amount method or expected amount method, whichever best estimates the amount expected to be received. We then consider any constraints on the variable consideration and include in the transaction price variable consideration to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved.

We then allocate the transaction price to each performance obligation based on the relative standalone selling price and recognize as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) control is transferred to the customer and the performance obligation is satisfied. For performance obligations which consist of licenses and other promises, we utilize judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress. We evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition.

We record amounts as accounts receivable when the right to consideration is deemed unconditional. Amounts received, or that are unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract are recognized as deferred revenue. Amounts expected to be recognized as revenue within the 12 months following the balance sheet date are classified as the current portion of deferred revenue. Amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as deferred revenue, net of current portion.

Our revenue generating arrangements typically include upfront license fees, milestone payments and/or royalties.

If a license is determined to be distinct from the other performance obligations identified in the arrangement, we recognize revenue from nonrefundable, up-front fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. For licenses that are bundled with other promises, we utilize judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. We evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition.

At the inception of an agreement that includes research and development milestone payments, we evaluate each milestone to determine when and how much of the milestone to include in the transaction price. We first estimate the amount of the milestone payment that we could receive using either the expected value or the most likely amount approach. We primarily use the most likely amount approach as this approach is generally most predictive for milestone payments with a binary outcome. Then, we consider whether any portion of the estimated amount is subject to the variable consideration constraint (that is, whether it is probable that a significant reversal of cumulative revenue would not occur upon resolution of the uncertainty). We update the estimate of variable consideration included in the transaction price at each reporting date which includes updating the assessment of the likely amount of consideration and the application of the constraint to reflect current facts and circumstances.

For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, we will recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied).

During the three months ended March 31, 2023 and 2022, we recognized less than $0.1 million and $0.6 million, respectively, in collaboration revenue under the AstraZeneca Agreement in the condensed consolidated statement of operations and comprehensive loss.

Accrued Research and Development Expenses

As part of the process of preparing our condensed consolidated financial statements, we are required to estimate our accrued research and development expenses. This process involves estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual costs. The majority of our service providers invoice us in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advance payments. We make estimates of our accrued expenses as of each balance sheet date in the consolidated financial statements based on facts and circumstances known to us at that time. At each end period, we confirm the accuracy of these estimates with the service providers and make adjustments, if necessary. Examples of estimated accrued research and development expenses include those related to fees paid to:

•vendors in connection with preclinical development activities;

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•CROs in connection with preclinical studies and clinical trials; and

•CDMOs in connection with the production of preclinical and clinical trial materials.

We record the expense and accrual related to contract research and manufacturing based on our estimates of the services received and efforts expended considering a number of factors, including our knowledge of the progress towards completion of the research, development and manufacturing activities, invoicing to date under the contracts, communication from the CROs, CDMOs and other companies of any actual costs incurred during the period that have not yet been invoiced and the costs included in the contracts and purchase orders. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. In accruing service fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, we adjust the accrual or the amount of prepaid expenses accordingly. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there have not been any material adjustments to our prior estimates of accrued research and development expenses.

Share-Based Compensation

We measure all share-based awards granted to employees, directors and non-employee consultants based on their fair value on the date of the grant using the Black-Scholes option-pricing model and recognize compensation expense for those awards over the requisite service period, which is generally the vesting period of the respective award. We issue share-based awards with only service-based vesting conditions and record the expense for these awards using the straight-line method. We have not issued any share-based awards with performance-based vesting conditions that are within our control and that may be considered probable prior to occurrence or with market-based vesting conditions.

The Black-Scholes option-pricing model uses as inputs the fair value of our common shares and assumptions we make for the volatility of our common shares, the expected term of our stock options, the risk-free interest rate for a period that approximates the expected term of our stock options and our expected dividend yield. As of January 1, 2023, we began using a blended average of our historical volatility and the historical volatility of a publicly traded set of peer companies to calculate the expected volatility when valuing our stock options. Prior to January 1, 2023, since we were historically a private company which lacked sufficient company-specific historical and implied volatility information, we estimated our expected share volatility based on the historical volatility of a publicly traded set of peer companies.

Emerging Growth Company Status

The Jumpstart Our Business Startups Act of 2012, or the JOBS Act, permits an “emerging growth company” such as us to take advantage of an extended transition period to comply with new or revised accounting standards applicable to public companies until those standards would otherwise apply to private companies. We have elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, we will not be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies and our financial statements may not be comparable to other public companies that comply with new or revised accounting pronouncements as of public company effective dates. We may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for private companies.

We will cease to be an emerging growth company on the date that is the earliest of (i) the last day of the fiscal year in which we have total annual gross revenues of $1.235 billion or more, (ii) the last day of our fiscal year following the fifth anniversary of the date of the closing of our IPO, (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous three years or (iv) the date on which we are deemed to be a large accelerated filer under the rules of the Securities and Exchange Commission.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

As of March 31, 2023 and December 31, 2022, we had an aggregate cash, cash equivalents, restricted cash and investments balance of $222.5 million and $188.1 million, respectively, which consisted of cash, money market funds, U.S. and Canadian Government agency debt securities, corporate bonds, municipal bonds and commercial paper. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of U.S. interest rates, particularly because the majority of our investments are short-term in nature. Due to the short-term duration of our investment portfolio and the low risk profile of our investments, we believe an immediate 10% change in interest rates would not have a material effect on the fair market value of our investment portfolio. We have the ability to hold our investments until maturity, and therefore, we would not expect our operating results or cash flows to be affected to any significant degree, by the effect of a change in market interest rates on our investment portfolio.

As of March 31, 2023, we had $35.0 million of borrowings outstanding under the Loan Agreement. Interest on the outstanding borrowings under the Loan Agreement accrues at a floating per annum rate equal to the greater of (i) 8.00% and (ii) the sum of (a) 1-Month CME Term Secured Overnight Financing Rate, or SOFR, (b) 0.10% and (c) 7.90%. An immediate 10% change in the one-month SOFR rate would not have a material impact on our debt-related obligations, financial position or results of operations.

Foreign Currency Exchange Risk

Our reporting currency is the U.S. dollar. The functional currency of our operating company in Canada and operating company in the U.S. is also the U.S. dollar. As a result, we record no cumulative translation adjustments related to translation of unrealized foreign exchange gains or losses.

For the remeasurement of local currency to the U.S. dollar functional currency of the Canadian entity, assets and liabilities are translated into U.S. dollars at the exchange rate in effect on the balance sheet date, and income items and expenses are translated into U.S. dollars at the average exchange rate in effect during the period. Resulting transaction gains (losses) are included in other income (expense), net in the consolidated statements of operations and comprehensive loss, as incurred. During the three months ended March 31, 2023 and 2022, recognized transaction gains and losses were insignificant.

We do not believe that we are subject to significant risk related to foreign currency exchange rate changes, and we do not expect that foreign currency transaction gains and losses will have a material effect on our financial position or results of operations in the foreseeable future.

Effects of Inflation

Inflation generally affects us by increasing our cost of labor, research supplies and materials and manufacturing raw materials. We do not believe that inflation had a material effect on our business, financial condition or results of operations during the three months ended March 31, 2023 and 2022.

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Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and our principal financial officer, evaluated, as of the end of the period covered by this Quarterly Report on Form 10-Q, the effectiveness of our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Based on the evaluation of our disclosure controls and procedures as of March 31, 2023, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures as of such date are effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended March 31, 2023 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

On February 13, 2023, we filed an Inter Partes Review, or IPR, petition with the United States Patent and Trademark Office, or USPTO, to challenge the validity of a certain issued U.S. Patent relating to FPI-2265. We cannot predict if the IPR will be instituted by the USPTO or, if instituted, we will prevail.

We are not currently a party to any other material legal proceedings. From time to time, we may become involved in other litigation or legal proceedings relating to claims arising from the ordinary course of business.

Item 1A. Risk Factors.

Careful consideration should be given to the following risk factors, in addition to the other information set forth in this Quarterly Report on Form 10-Q, including our condensed consolidated financial statements and the related notes, and in other documents that we file with the SEC, in evaluating our company and our business. Investing in our common shares involves a high degree of risk. If any of the following risks actually occur, our business, financial condition, results of operations and future growth prospects could be materially and adversely affected.

The risks described below are not intended to be exhaustive and are not the only risks facing the company. New risk factors can emerge from time to time, and it is not possible to predict the impact that any factor or combination of factors may have on our business, financial condition, results of operations and future growth prospects.

Please see page ii of this Quarterly Report on Form 10-Q for a summary of the principal risks that we believe are specific to Fusion, followed by more detailed descriptions of all risk factors below, both those that are company-specific, as well as those that are more generally associated with both our industry and ownership of securities in general.

Company Specific Risk Factors

Risks Related to Our Financial Condition and Capital Requirements

We have incurred significant losses since inception, and we expect to incur losses over the next several years and may not be able to achieve or sustain revenues or profitability in the future.

Investment in drug and biopharmaceutical product development is a highly speculative undertaking and entails substantial upfront capital expenditures and significant risk that any potential product candidate will fail to demonstrate adequate efficacy or an acceptable safety profile, gain regulatory approval and become commercially viable. We are still in the early stages of development of our product candidates, and our lead product candidate is only in a Phase 2 clinical trial. We have no products licensed for commercial sale and have not generated any revenue from product sales to date, and we continue to incur significant research and development and other expenses related to our ongoing operations. To date, we have financed our operations primarily through equity financings.

We have incurred significant net losses in each period since our inception in December 2014. For the three months ended March 31, 2023, we reported a net loss of $24.3 million. For the years ended December 31, 2022 and 2021, we reported net losses of $87.6 million and $81.0 million, respectively. As of March 31, 2023, we had an accumulated deficit of $306.2 million. We expect to continue to incur significant losses for the foreseeable future, and we expect these losses to increase substantially if and as we:

•continue our research and development efforts and submit biologics license applications, or BLAs, for our lead product candidates and submit investigational new drug applications, or INDs, and BLAs and new drug applications, or NDAs, for our other biologic and drug product candidates, respectively;

•conduct preclinical studies and clinical trials for our current and future product candidates;

•continue to develop our library of proprietary linkers for our Fast-Clear technology;

•seek to identify additional product candidates;

•acquire or in-license other product candidates, targeting molecules and technologies;

•continue strategic investments in manufacturing and supply chain capabilities, including the production and supply of 225Ac;

•add operational, financial and management information systems and personnel, including personnel to support the development of our product candidates and help us comply with our obligations as a public company;

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•hire and retain additional personnel, such as clinical, quality control, scientific, commercial and administrative personnel;

•seek marketing approvals for any product candidates that successfully complete clinical trials;

•establish a sales, manufacturing, marketing and distribution infrastructure and scale-up manufacturing capabilities, whether alone or with third parties, to commercialize any product candidates for which we may obtain regulatory approval, if any; and

•expand, maintain and protect our intellectual property portfolio.

Because of the numerous risks and uncertainties associated with drug and biopharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses we will incur or when, if ever, we will be able to achieve profitability. Even if we succeed in commercializing one or more of our product candidates, we will continue to incur substantial research and development and other expenditures to develop, seek regulatory approval for, and market additional product candidates. We may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenue. Our prior losses and expected future losses have had and will continue to have an adverse effect on our shareholders’ equity and working capital.

We will require substantial additional financing, which may not be available on acceptable terms, or at all. A failure to obtain this necessary capital when needed could force us to delay, limit, reduce or terminate our product development or commercialization efforts.

Our operations have consumed substantial amounts of cash since inception. We expect to continue to spend substantial amounts to continue the clinical development of FPI-2265, our newly acquired PSMA-I&T asset, FPI-1434, FPI-2059 and FPI-2068, which recently received IND clearance from the FDA and is being jointly developed with AstraZeneca under our collaboration agreement, the planned IND-enabling studies and future clinical trials for our other product candidates and to continue to identify new product candidates. We will require significant additional amounts of funding in order to launch and commercialize our product candidates.

On June 30, 2020, we completed an initial public offering of our common shares by issuing 12,500,000 common shares, at $17.00 per share, for net proceeds of approximately $193.1 million. As of March 31, 2023, we had approximately $222.5 million in cash, cash equivalents, restricted cash and investments. Based on our research and development plans, we expect our cash, cash equivalents and investments at March 31, 2023 will enable us to fund our operating expenses and capital expenditure requirements into the first quarter of 2025. Following the May 2023 announcement to cease further clinical development of our FPI-1966 program and $20.0 million in gross proceeds from our private placement which is expected to close in May 2023, we believe that our cash, cash equivalents and investments will be sufficient to fund our operating expenses and capital expenditure requirements into the second quarter of 2025. We will require significant additional amounts of cash in order to continue to develop, launch and commercialize our current and future product candidates to the extent that such launch and commercialization are not the responsibility of a future collaborator that we may contract with in the future. In addition, other unanticipated costs may arise in the course of our development efforts. Because the design and outcome of our planned and anticipated clinical trials is highly uncertain, we cannot reasonably estimate the actual amounts necessary to successfully complete the development and commercialization of any product candidate we develop.

Our future capital requirements depend on many factors, including:

•the scope, progress, results and costs of researching and developing FPI-2265, FPI-1434, FPI-2059 and FPI-2068 and our other product candidates;

•the timing of, and the costs involved in, obtaining marketing approvals for our current and future product candidates;

•the number of future product candidates and potential additional indications that we may pursue and their development requirements;

•the cost and timing of establishing our own manufacturing facilities and manufacturing our product candidates for clinical trials in preparation for regulatory approval and in preparation for commercialization;

•the cost and availability of 225Ac or any other medical isotope we may incorporate into our product candidates;

•if approved, the costs of commercialization activities for any approved product candidate to the extent such costs are not the responsibility of any future collaborators, including the costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

•subject to receipt of regulatory approval and revenue, if any, received from commercial sales for any approved indications for any of our product candidates;

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•the extent to which we in-license or acquire rights to other products, product candidates or technologies;

•our headcount growth and associated costs as we expand our research and development capabilities and establish a commercial infrastructure;

•the costs of preparing, filing and prosecuting patent applications and maintaining and protecting our intellectual property rights, including enforcing and defending intellectual property related claims; and

•the costs of operating as a public company.

We cannot be certain that additional funding will be available on acceptable terms, or at all. If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue the development or commercialization of our product candidates or other research and development initiatives. Any of our current or future license agreements may also be terminated if we are unable to meet the payment or other obligations under the agreements.

We have not generated any revenue from product sales to date and may never be profitable.

Our ability to become profitable depends upon our ability to generate revenue. To date, we have not generated any revenue from product sales. We do not expect to generate significant product revenue unless or until we successfully complete clinical development and obtain regulatory approval of, and then successfully commercialize, at least one of our product candidates. Other than FPI-2265, FPI-1434, FPI-2059 and FPI-2068, all of our product candidates are in the preclinical stages of clinical development and will require additional preclinical studies or clinical development as well as regulatory review and approval, substantial investment, access to sufficient commercial manufacturing capacity and significant marketing efforts before we can generate any revenue from product sales. As such, we face significant development risk as our product candidates advance further through preclinical and clinical development. Our ability to generate revenue depends on a number of factors, including, but not limited to:

•timely completion of our preclinical studies and our current and future clinical trials, which may be significantly slower or more costly than we currently anticipate and will depend substantially upon the performance of third-party contractors;

•our ability to complete IND-enabling studies and successfully submit INDs or comparable applications to allow us to initiate clinical trials for our current or any future product candidates;

•whether we are required by the U.S. Food and Drug Administration, or FDA, or similar foreign regulatory authorities to conduct additional clinical trials or other studies beyond those planned to support the approval and commercialization of our product candidates or any future product candidates;

•our ability to demonstrate to the satisfaction of the FDA or similar foreign regulatory authorities the safety, efficacy and acceptable risk-to-benefit profile of our product candidates or any future product candidates;

•the prevalence, duration and severity of potential side effects or other safety issues experienced with our product candidates or future product candidates, if any;

•the timely receipt of necessary marketing approvals from the FDA or similar foreign regulatory authorities;

•the willingness of physicians, operators of clinics and patients to utilize or adopt any of our product candidates or future product candidates as potential cancer treatments;

•our ability, and the ability of third parties with whom we contract, to manufacture adequate clinical and commercial supplies of our product candidates or any future product candidates, remain in good standing with regulatory authorities and develop, validate and maintain commercially viable manufacturing processes that are compliant with current good manufacturing practices, or cGMP;

•our ability to successfully develop a commercial strategy and thereafter commercialize our product candidates or any future product candidates in the United States and internationally, if licensed for marketing, reimbursement, sale and distribution in such countries and territories, whether alone or in collaboration with others; and

•our ability to establish and enforce intellectual property rights in and to our product candidates or any future product candidates.

Many of the factors listed above are beyond our control and could cause us to experience significant delays or prevent us from obtaining regulatory approvals or commercialize our product candidates. Even if we are able to commercialize our product candidates, we may not achieve profitability soon after generating product sales, if ever. If we are unable to generate sufficient revenue through the sale of our product candidates or any future product candidates, we may be unable to continue operations without continued funding.

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Our limited operating history may make it difficult for you to evaluate the success of our business to date and to assess our future viability.

We are a clinical-stage oncology company with a limited operating history. We were founded to advance certain intellectual property relating to radiopharmaceuticals that had been developed by the Centre for Probe Development and Commercialization, or CPDC, in December 2014, and our operations to date have been limited to organizing and staffing our company, business planning, raising capital, conducting discovery and research activities, filing patent applications, identifying potential product candidates, initiating and conducting our Phase 1 clinical trials, undertaking preclinical studies, in-licensing product candidates for development, and establishing arrangements with third parties for the manufacture of initial quantities of our product candidates and component materials. We have only advanced four product candidates to clinical development. We have not yet demonstrated our ability to successfully complete any clinical trials, obtain marketing approvals, manufacture a commercial-scale product or arrange for a third party to do so on our behalf, or conduct sales, marketing and distribution activities necessary for successful product commercialization. Consequently, any predictions you make about our future success or viability may not be as accurate as they could be if we had a longer operating history.

In addition, we may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors. We will need to transition at some point from a company with a research and development focus to a company capable of supporting commercial activities. We may not be successful in such a transition.

Raising additional capital may cause dilution to our shareholders, restrict our operations or require us to relinquish rights to our technologies or product candidates.

We expect our expenses to increase in connection with our planned operations. Unless and until we can generate a substantial amount of revenue from our product candidates, we expect to finance our future cash needs through public or private equity offerings, debt financings, collaborations, licensing arrangements or other sources, or any combination of the foregoing. In addition, we may seek additional capital due to favorable market conditions or strategic considerations, even if we believe that we have sufficient funds for our current or future operating plans. To the extent that we raise additional capital through the sale of common shares, convertible securities or other equity securities, your ownership interest may be diluted, and the terms of these securities could include liquidation or other preferences and anti-dilution protections that could adversely affect your rights as a common shareholder. In addition, debt financing, if available, may result in fixed payment obligations and may involve agreements that include restrictive covenants that limit our ability to take specific actions, such as incurring additional debt, making capital expenditures, creating liens, redeeming shares or declaring dividends, that could adversely impact our ability to conduct our business. Our pledge of our assets as collateral to secure our obligations under our loan and security agreement, the Loan Agreement, with Oxford Finance LLC, or Oxford, may limit our ability to obtain additional debt financing. Under the Loan Agreement, we are also restricted from paying dividends on our common shares, granting liens, making investments, making acquisitions, making certain restricted payments, selling assets and making certain other uses of our cash without the lenders’ consent, subject in each case to certain exceptions. In addition, securing financing could require a substantial amount of time and attention from our management and may divert a disproportionate amount of their attention away from day-to-day activities, which may adversely affect our management’s ability to oversee the development of our product candidates. If we raise additional funds through collaborations, strategic alliances, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams or product candidates or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds when needed, we would be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Our ability to use our net operating loss carryforwards to offset future taxable income may be subject to certain limitations.

In general, where control of a corporation has been acquired by a person or group of persons, subsection 111(5) of the Income Tax Act (Canada), or the Canadian Tax Act, and equivalent provincial income tax legislation restrict a corporation’s ability to carry forward net operating losses from preceding taxation years. We have not performed a detailed analysis to determine whether an acquisition of control for the purposes of subsection 111(5) of the Canadian Tax Act has occurred after each of our previous issuances of our common shares or preferred shares or our subsidiary’s preferred exchangeable shares. As of December 31, 2022, we had $170.2 million of Canadian net operating loss carryforwards that begin to expire in 2035. In addition, we had $6.4 million of Canadian research and development tax credit carryforwards that begin to expire in 2037 and an available Canadian research and development expenditure pool of $35.5 million, which expenditures are available to reduce future taxable income and generally have an unlimited carryforward period. Research and development tax credits and expenditures are subject to verification by the tax authorities, and, accordingly, these amounts may vary. Future changes in our share ownership, some of which are outside of our control, could result in an acquisition of control for the purposes of subsection 111(5) of the Canadian Tax Act. Therefore, our ability to utilize our existing net operating loss carryforwards, research and development tax credits and research and development expenditure pool, as well as tax attributes from any

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companies that we may acquire in the future, may be subject to limitations. As a result, even if we attain profitability, we may be unable to use a material portion of our net operating losses and other tax attributes, which could negatively impact our future cash flows.

We have a significant amount of debt which may affect our ability to operate our business and secure additional financing in the future.

In April 2022, we borrowed $10.0 million under the Loan Agreement. In September 2022, we borrowed an additional $25.0 million, under the Loan Agreement.

Our obligations under the Loan Agreement are secured by substantially all of our assets. The Loan Agreement requires us, and any debt arrangements or instruments we may enter into in the future may require us, to comply with various covenants that limit our ability to, among other things:

•dispose of assets;

•complete mergers or acquisitions;

•incur or guarantee indebtedness;

•sell or encumber certain assets;

•pay dividends or make other distributions to holders of our common shares, including by way of certain share buybacks;

•make specified investments;

•engage in different lines of business;

•change certain key management personnel; and

•engage in certain transactions with our affiliates.

These covenants may make it difficult to operate our business. A failure by us to comply with the covenants could result in an event of default, which could adversely affect our ability to respond to changes in our business and manage our operations. Upon the occurrence of an event of default, including the occurrence of a material adverse change, the lender could elect to declare all amounts outstanding to be due and payable and exercise other remedies. Because our debt under the Loan Agreement bears interest at floating interest rates based on the 1-month Secured Overnight Financing Rate, a new index calculated by reference to short-term repurchase agreements backed by Treasury securities, increases in interest rates could materially increase our interest expense. If the indebtedness were to be accelerated, our future financial condition could be materially adversely affected.

We may incur additional indebtedness in the future. The instruments governing such indebtedness could contain provisions that are as, or more, restrictive than our existing debt instruments. If we are unable to repay, refinance or restructure our indebtedness when payment is due, the lenders could proceed against any collateral granted to them to secure such indebtedness or force us into bankruptcy or liquidation. Further, if our business is subject to liquidation, the right to repayment of the obligations under the Loan Agreement and any other holders of indebtedness would be senior to the rights of the holders of our common shares to receive any proceeds from the liquidation.

Risks Related to the Development of Our Product Candidates

Our approach to the discovery and development of product candidates represents a novel approach to radiation therapy, which creates significant and potentially unpredictable challenges for us.

Our future success depends on the successful development of our product candidates, which are designed to treat advanced solid tumors using Targeted Alpha Therapies, or TAT, product candidates, representing a novel approach to radiopharmaceutical therapy. Alpha emitting isotope oncology therapy is relatively new, and only one alpha emitting isotope therapy has been approved in the United States or the European Union and only a limited number of clinical trials of products based on alpha emitting isotope therapies have commenced. As such, it is difficult to accurately predict the developmental challenges we may incur for our product candidates as they proceed through product discovery or identification, preclinical studies and clinical trials. In addition, beyond the limited universe of patients treated with Xofigo, an approved radiopharmaceutical for the treatment of treatment resistant prostate cancer, assessments of the long-term safety of targeted alpha emitting isotope therapies in humans have been limited, and there may be long-term effects from treatment with any of our future product candidates that we cannot predict at this time. It is difficult for us to predict the time and cost of the development of our product candidates, and we cannot predict whether the application of our technology, or any similar or competitive technologies, will result in the identification, development, and regulatory approval of any products. There can be no assurance that any development problems we experience in the future related to our technology or any of our research programs will not

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cause significant delays or unanticipated costs, or that such development problems can be solved at all. Any of these factors may prevent us from completing our preclinical studies and clinical trials that we may initiate or commercializing any product candidates we may develop on a timely or profitable basis, if at all. In addition, the success of our TATs, including our lead product candidates, will depend on several factors, including the following:

•sourcing clinical and, if successfully approved for commercial sale, commercial supplies, including 225Ac, for the materials used to manufacture our product candidates;

•building-out and scaling up our manufacturing facilities to produce adequate amounts of our product candidates;

•utilizing imaging analogues or other companion diagnostics to visualize tumor uptake in advance of administering our product candidates, which may increase the risk of adverse side effects;

•educating medical personnel regarding the potential side effect profile of our product candidates;

•facilitating patient access to the limited number of facilities able to administer our product candidates, if licensed;

•using medicines to manage adverse side effects of our product candidates that may not adequately control the side effects or that may have detrimental impacts on the efficacy of the treatment; and

•establishing sales and marketing capabilities upon obtaining any regulatory approval to gain market acceptance of a novel therapy.

We are early in our development efforts. If we are unable to advance our product candidates through clinical development, obtain regulatory approval and ultimately commercialize our product candidates, or if we experience significant delays in doing so, our business will be materially harmed.

We are early in our development efforts. FPI-2265, our most advanced product candidate is in Phase 2 and FPI-1434, FPI-2059 and FPI-2068, our other product candidates, are still in the early stages of clinical development. Our ability to generate product revenues, which we do not expect will occur for many years, if ever, will depend heavily on the successful development and eventual commercialization of one or more of our product candidates. The success of our product candidates will depend on several factors, including the following:

•successful completion of preclinical studies;

•successful initiation of clinical trials;

•successful patient enrollment in, and completion, of clinical trials;

•the ability to successfully develop, in-license or otherwise acquire additional targeting molecules for our TATs;

•receipt and related terms of marketing approvals from applicable regulatory authorities;

•obtaining and maintaining patent and trade secret protection and regulatory exclusivity for our product candidates;

•making and maintaining arrangements with third-party manufacturers, or building and maintaining our own manufacturing capabilities, for both clinical and commercial supplies of our product candidates;

•establishing sales, marketing and distribution capabilities and successfully launching commercial sales of our products, if and when approved, whether alone or in collaboration with others;

•acceptance of our products, if and when approved, by patients, the medical community and third-party payors;

•effectively competing with other cancer therapies;

•obtaining and maintaining third-party coverage and adequate reimbursement; and

•maintaining a continued acceptable safety profile of our products following regulatory approval.

If we do not achieve one or more of these factors in a timely manner or at all, we could experience significant delays or be unable to successfully commercialize our product candidates, which would materially harm our business.

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Our business is highly dependent on our lead product candidates, FPI-2265, FPI-1434, FPI-2059 and FPI-2068, as the lead investigational assets for our TAT platform and we must complete preclinical studies and clinical testing before we can seek regulatory approval and begin commercialization of any of our other product candidates. If we are unable to obtain regulatory approval for, and successfully commercialize FPI-2265, FPI-1434, FPI-2059 or FPI-2068, our business may be materially harmed and such failure may affect the viability of our other product candidates.

There is no guarantee that any of our product candidates will proceed in preclinical or clinical development or achieve regulatory approval. The process for obtaining marketing approval for any product candidate is very long and risky and there will be significant challenges for us to address in order to obtain marketing approval as planned or, if at all.

There is no guarantee that the results obtained in current and planned preclinical studies or our Phase 1 clinical trials of FPI-2265, FPI-1434, FPI-2059 or FPI-2068 or future clinical trials will be sufficient to obtain regulatory approval. In addition, because our lead product candidates are our most advanced product candidates, and because our future product candidates that use antibodies as a targeting molecule are based or will be based on our Fast-Clear technology, if our lead product candidates encounter safety or efficacy problems, developmental delays, regulatory issues, or other problems, our development plans and business related to our other current or future product candidates using antibodies could be significantly harmed. A failure of either of our lead product candidates may affect the ability to obtain regulatory approval to continue or conduct clinical programs for our other or future product candidates. Further, competitors who are developing products with similar technology may experience problems with their products that could identify problems that would potentially harm our business.

Clinical development involves a lengthy and expensive process with uncertain outcomes, and results of earlier studies and trials may not be predictive of future clinical trial results. If our preclinical studies and clinical trials are not sufficient to support regulatory approval of any of our product candidates, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development of such product candidate.

We cannot be certain that our preclinical study and clinical trial results will be sufficient to support regulatory approval of our product candidates. Clinical testing is expensive and can take many years to complete, and its outcomes are inherently uncertain. Human clinical trials are expensive and difficult to design and implement, in part because they are subject to rigorous regulatory requirements. Our clinical trials may not be conducted as planned or completed on schedule, if at all, and failure can occur at any time during the preclinical study or clinical trial process. Despite promising preclinical or clinical results, any product candidate can unexpectedly fail at any stage of preclinical or clinical development. The historical failure rate for product candidates in our industry is high.

We may experience delays in obtaining the FDA’s authorization, or the authorization of similar foreign regulatory authorities, to initiate clinical trials. Additionally, we cannot be certain that preclinical studies or clinical trials for our product candidates will begin on time, not require redesign, enroll an adequate number of subjects on time, or be completed on schedule, if at all. Clinical trials can be delayed or terminated for a variety of reasons, including delays or failures related to:

•the availability of financial resources to commence and complete the planned trials;

•the FDA or similar foreign regulatory authorities disagreeing as to the design or implementation of our clinical trials;

•delays in obtaining regulatory approval or authorization to commence a clinical trial, including delays or issues relating to our use of imaging analogues or any future companion diagnostics we may develop;

•reaching agreement on acceptable terms with prospective contract research organizations, or CROs, and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and clinical trial sites;

•obtaining institutional review board, or IRB, research ethics board, or REB, or ethics committee approval at each clinical trial site;

•recruiting an adequate number of suitable patients to participate in a clinical trial;

•having subjects complete a clinical trial or return for post-treatment follow-up;

•clinical trial sites deviating from clinical trial protocol or dropping out of a clinical trial;

•having third-party contractors fail to complete their obligations in a timely manner or failing to comply with applicable regulatory requirements;

•addressing subject safety concerns that arise during the course of a clinical trial;

•adding a sufficient number of clinical trial sites; or

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•obtaining sufficient product supply of our product candidates, and components thereof, including 225Ac for use in preclinical studies or clinical trials from third-party suppliers.

If we are required to conduct additional clinical trials or other testing of our product candidates beyond those that we currently contemplate, if we are unable to successfully complete clinical trials of our product candidates or other testing, if the results of these trials or tests are not positive or are not as positive as we expect or if there are safety concerns, our business and results of operations may be adversely affected and we may incur significant additional costs. Accordingly, our clinical trial costs are likely to be significantly higher than those for more conventional therapeutic technologies or drug product candidates.

We could also experience delays if physicians encounter unresolved ethical issues associated with enrolling patients in clinical trials of our product candidates in lieu of prescribing existing treatments that have established safety, efficacy, potency and purity profiles. We could also encounter delays if a clinical trial is suspended or terminated by us, by the IRBs or REBs of the institutions in which such clinical trials are being conducted, by the Data Safety Monitoring Board for such clinical trial or by the FDA or similar foreign regulatory authorities. Such authorities may suspend or terminate a clinical trial due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical trial protocols, inspection of the clinical trial operations or trial site by the FDA or similar regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from the product candidates, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial.

If we experience delays in the completion, or termination, of any preclinical study or clinical trial of our product candidates, the commercial prospects of our product candidates may be harmed, and our ability to generate revenues from any of these product candidates will be delayed or not realized at all. In addition, any delays in completing our preclinical studies or clinical trials may increase our costs, slow down the development of our product candidates and approval process and jeopardize our ability to commence product sales and generate revenues. Any of these occurrences may significantly harm our business, financial condition and prospects. In addition, many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of our product candidates. If one or more of our product candidates that use antibodies as a targeting molecule generally prove to be ineffective, unsafe or commercially unviable, our antibody-based pipeline using the Fast-Clear technology could have little, if any, value, which would have a material and adverse effect on our business, financial condition, results of operations and prospects.

The commercial success of our products and product candidates will depend upon public perception of radiopharmaceuticals and the degree of their market acceptance by physicians, patients, healthcare payors and others in the medical community.

Adverse events in clinical trials of our product candidates or in clinical trials of others developing similar products and the resulting negative publicity, as well as any other adverse events in the field of radiopharmaceuticals that may occur in the future, could result in a decrease in demand for our products or any product candidates that we may develop. If public perception is influenced by claims that radiopharmaceuticals or specific therapies within radiopharmaceuticals are unsafe, our products or product candidates may not be accepted by the general public or the medical community.

In particular, the future commercial success of our products and product candidates, as applicable, depends and will depend upon, among other things, these products and product candidates gaining and maintaining acceptance by physicians, patients, third-party payors and other members of the medical community as efficacious and cost-effective alternatives to competing products and treatments. If any of our products or product candidates do not achieve and maintain an adequate level of acceptance, we may not generate material sales of that product or product candidate or be able to successfully commercialize it. The degree of market acceptance of our products and product candidates will depend on a number of factors, including:

•our ability to provide acceptable evidence of safety and efficacy;

•the prevalence and severity of any side effects;

•publicity concerning our products and product candidates or competing products and treatments;

•availability, relative cost and relative efficacy of alternative and competing treatments;

•the ability to offer our products for sale at competitive prices;

•the relative convenience and ease of administration of our products and product candidates;

•the willingness of the target patient population to try new products and product candidates and of physicians to prescribe these products and product candidates;

•the strength of marketing and distribution support; and

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•the sufficiency of coverage or reimbursement by third parties.

If our products, if approved, do not become widely accepted by potential customers, physicians, patients, third-party payors and other members of the medical community, such a lack of acceptance could have a material adverse effect on our business, financial condition and results of operations.

We expect to develop many of our product candidates, and potentially future product candidates, in combination with other therapies, which exposes us to additional risks.

We intend to develop FPI-2265, FPI-1434, FPI-2059 and FPI-2068, and may develop future product candidates, for use in combination with one or more currently approved cancer therapies. For example, in May 2021, we announced that we had entered into a clinical trial collaboration with a subsidiary of Merck to evaluate FPI-1434 in combination with Merck’s anti-PD-1 (programmed death receptor-1) therapy, KEYTRUDA® (pembrolizumab), in patients with solid tumors expressing insulin-like growth factor 1 receptor. Even if any product candidate we develop was to receive marketing approval or be commercialized for use in combination with other existing therapies, we would continue to be subject to the risks that the FDA or similar foreign regulatory authorities could revoke approval of the therapy used in combination with our product candidate or that safety, efficacy, manufacturing or supply issues could arise with these existing therapies. Combination therapies are commonly used for the treatment of cancer, and we would be subject to similar risks if we develop any of our product candidates for use in combination with other drugs or for indications other than cancer. This could result in our own products being removed from the market or being less successful commercially.

We may also evaluate our current or any other future product candidates in combination with one or more other cancer therapies that have not yet been approved for marketing by the FDA or similar foreign regulatory authorities. We will not be able to market and sell any product candidate we develop in combination with any such unapproved cancer therapies that do not ultimately obtain marketing approval.

If the FDA or similar foreign regulatory authorities do not approve these other drugs or revoke their approval of, or if safety, efficacy, manufacturing, or supply issues arise with, the drugs we choose to evaluate in combination with our current product candidates or any product candidate we develop, we may be unable to obtain approval of or market any such product candidate we develop.

We may be unable to obtain regulatory approval for our product candidates under applicable regulatory requirements. The denial or delay of any such approval would delay commercialization of our product candidates and adversely impact our potential to generate revenue, our business and our results of operations.

The research, testing, manufacturing, labeling, licensure, sale, marketing and distribution of biologic products and drugs are subject to extensive regulation by the FDA and similar regulatory authorities in the United States and other countries, and such regulations differ from country to country. We are not permitted to market our product candidates in the United States or in any foreign countries until they receive the requisite marketing approval from the applicable regulatory authorities of such jurisdictions.

The FDA and similar foreign regulatory authorities can delay, limit or deny marketing authorization of our product candidates for many reasons, including:

•our inability to demonstrate to the satisfaction of the FDA or similar foreign regulatory authority that any of our product candidates are safe, potent and pure, or safe and effective, for their proposed indication;

•the FDA’s or the applicable foreign regulatory authority’s disagreement with our trial protocols, trial designs or the interpretation of data from preclinical studies or clinical trials;

•our inability to demonstrate that the clinical and other benefits of any of our product candidates outweigh any safety or other perceived risks;

•the FDA’s or the applicable foreign regulatory authority’s requirement for additional preclinical studies or clinical trials;

•the results of clinical trials may not meet the level of statistical significance required by the FDA or similar foreign regulatory authorities for marketing approval, or that regulatory authorities may require us to include a larger number of patients than we anticipated;

•the FDA’s or the applicable foreign regulatory authority’s failure to approve the manufacturing processes or facilities of third-party manufacturers upon which we rely;

•the quality of our product candidates or other materials necessary to conduct preclinical studies or clinical trials of our product candidates, including any potential companion diagnostics, may be insufficient or inadequate;

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•the potential for approval policies or regulations of the FDA or similar foreign regulatory authorities to significantly change in a manner rendering our clinical data insufficient for marketing approval; or

•the data collected from clinical trials of our product candidates may not be sufficient to the satisfaction of the FDA or comparable foreign regulatory authorities to support the submission of a BLA, NDA, or other comparable submission in foreign jurisdictions or to obtain approval of our product candidates in the United States or elsewhere.

Any of these factors, many of which are beyond our control, may result in our failing to obtain regulatory approval to market any of our product candidates, which would significantly harm our business, results of operations and prospects. Of the large number of biologic and drug product candidates in development, only a small percentage successfully complete the FDA or similar regulatory approval processes and are commercialized. Even if we eventually complete clinical testing and receive marketing authorization from the FDA or similar foreign regulatory authorities for any of our product candidates, the FDA or similar foreign regulatory authority may grant approval contingent on the performance of costly additional clinical trials which may be required after approval. The FDA or similar foreign regulatory authority also may approve our product candidates for a more limited indication or a narrower patient population than we originally requested, and the FDA similar other foreign regulatory authority, may not approve our product candidates with the labeling that we believe is necessary or desirable for the successful commercialization of such product candidates.

In addition, even if the trials are successfully completed, preclinical and clinical data are often susceptible to varying interpretations and analyses, and we cannot guarantee that the FDA or similar foreign regulatory authorities will interpret the results as we do, and more clinical trials could be required before we submit our product candidates for approval. To the extent that the results of the clinical trials are not satisfactory to the FDA or similar foreign regulatory authorities for support of a marketing application, approval of our product candidates may be significantly delayed, or we may be required to expend significant additional resources, which may not be available to us, to conduct additional clinical trials in support of potential approval of our product candidates.

Any delay in obtaining, or inability to obtain, applicable regulatory approval would delay or prevent commercialization of our product candidates and would materially adversely impact our business and prospects.

Our preclinical studies and clinical trial may fail to adequately demonstrate the safety, potency and purity, or safety and effectiveness, of any of our product candidates, which would prevent or delay development, regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of our product candidates, including our lead product candidates, we must demonstrate through lengthy, complex and expensive preclinical studies and clinical trials that our product candidates are both safe and effective for use in each target indication. Preclinical studies and clinical trials are expensive and can take many years to complete, and their outcomes are inherently uncertain. Failure can occur at any time during the preclinical study and clinical trial processes, and, because our product candidates are in an early stage of development, there is a high risk of failure and we may never succeed in developing marketable products.

Any preclinical studies or clinical trials that we may conduct may not demonstrate the safety, potency and purity, or safety and effectiveness, necessary to obtain regulatory approval to market our product candidates. If the results of our ongoing or future preclinical studies and clinical trials are inconclusive, if we do not meet the clinical endpoints with statistical and clinically meaningful significance, or if there are safety concerns associated with our product candidates, we may be prevented or delayed in obtaining marketing approval for such product candidates. In some instances, there can be significant variability in results between different preclinical studies and clinical trials of the same product candidate due to numerous factors, including changes in trial procedures set forth in protocols, differences in the size and type of the patient populations, changes in and adherence to the clinical trial protocols and the rate of dropout among clinical trial participants.

In addition, for our Phase 2 clinical trial of FPI-2265, assuming successful transfer of RadioMedix’s IND for 225Ac-PSMA-I&T, and our Phase 1 clinical trials of FPI-1434, FPI-2059 and FPI-2068 and any future clinical trials that may be completed for our product candidates, we cannot guarantee that the FDA or similar foreign regulatory authorities will interpret the results as we do, and more trials could be required before we submit our product candidates for approval. To the extent that the results of the trials are not satisfactory to the FDA or similar foreign regulatory authorities to support a marketing application, approval of our product candidates may be significantly delayed or prevented entirely, or we may be required to expend significant additional resources, which may not be available to us, to conduct additional trials in support of potential approval of our product candidates.

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The results of preclinical studies and early-stage clinical trials may not be predictive of future results. Initial success in our ongoing clinical trials may not be indicative of results obtained when these trials are completed or in later-stage trials.

The results of preclinical studies may not be predictive of the results of clinical trials, and the results of any early-stage clinical trials we commence may not be predictive of the results of the later-stage clinical trials. In addition, initial success in clinical trials may not be indicative of results obtained when such trials are completed. For example, our ongoing trials of FPI-2265, FPI-1434, FPI-2059 and FPI-2068 utilize an “open-label” trial design. An “open-label” clinical trial is one where both the patient and investigator know whether the patient is receiving the investigational product candidate or either an existing approved drug or placebo. Most typically, open-label clinical trials test only the investigational product candidate and sometimes may do so at different dose levels. Open-label clinical trials are subject to various limitations that may exaggerate any therapeutic effect as patients in open-label clinical trials are aware when they are receiving treatment. Open-label clinical trials may be subject to a “patient bias” where patients perceive their symptoms to have improved merely due to their awareness of receiving an experimental treatment. In addition, open-label clinical trials may be subject to an “investigator bias” where those assessing and reviewing the physiological outcomes of the clinical trials are aware of which patients have received treatment and may interpret the information of the treated group more favorably given this knowledge. The results from an open-label trial may not be predictive of future clinical trial results with any of our product candidates for which we include an open-label clinical trial when studied in a controlled environment with a placebo or active control.

There can be no assurance that any of our current or future clinical trials will ultimately be successful or support further clinical development of any of our product candidates. There is a high failure rate for drugs and biologics proceeding through clinical trials.

A number of companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in clinical development even after achieving promising results in earlier studies, and any such setbacks in our clinical development could have a material adverse effect on our business and operating results. Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses and many companies that believed their product candidates performed satisfactorily in preclinical studies or clinical trials nonetheless failed to obtain FDA approval or approval from foreign regulatory authorities.

Interim, “top-line” and preliminary data from our clinical trials that we announce or publish from time to time may change as more patient data become available and are subject to audit and verification procedures that could result in material changes in the final data.

From time to time, we may publish interim, “top-line” or preliminary data from our clinical trials, which is based on a preliminary analysis of then-available data, and the results and related findings and conclusions are subject to change following a full analysis of all data related to the particular trial. We also make assumptions, estimations, calculations and conclusions as part of our analyses of data, and we may not have received or had the opportunity to fully and carefully evaluate all data. For example, our planned and ongoing Phase 1 and Phase 2 trials are and will be an open-label trial and we may decide to disclose interim, “top-line,” or preliminary safety data at certain points in its development. Such data from clinical trials that we may complete are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data become available. Interim, “top-line” or preliminary data also remain subject to audit and verification procedures that may result in the final data being materially different from the preliminary data we previously published. As a result, interim, “top-line,” and preliminary data should be viewed with caution until the final data are available. Adverse differences between interim, “top-line” or preliminary data and final data could significantly harm our reputation and business prospects.

In addition, the information we choose to publicly disclose regarding a particular study or clinical trial is distilled from a large body of raw data and you or others may not agree with what we determine is the material or otherwise appropriate information to include in our disclosures, and any information we determine not to disclose may ultimately be deemed significant with respect to future decisions, conclusions, views, activities or otherwise regarding a particular drug, product candidate or our business. If the interim, “top-line,” or preliminary data that we report differ from actual results, or if others, including regulatory authorities, disagree with the conclusions reached, our ability to obtain approval for and commercialize our product candidates, our business, prospects, financial condition and results of operations may be harmed.

Risks associated with the in-licensing or acquisition of drug candidates could cause substantial delays in the preclinical and clinical development of our drug candidates.

We acquired rights to FPI-2265 from RadioMedix Inc., or RadioMedix, in February 2023, after exercising our rights under an option and asset purchase agreement entered into in November 2022. Because we were not involved in the preclinical or clinical development of FPI-2265 prior to such date, we may experience difficulties in the transition of certain development activities from RadioMedix and its affiliates to us, which may result in delays in clinical trials, as well as problems in our development efforts, particularly if we do not receive all of the necessary information, reports and data from RadioMedix and its affiliates in a timely manner. Moreover, the current IND for FPI-2265 is an investigator sponsored IND and will need to be appropriately transferred to us. Once

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transferred, the IND will be considered a corporate sponsored IND by regulatory authorities which could result in additional requirements to the protocol or overall clinical trial design that could cause delays to the ongoing Phase 2 clinical study. In addition, we have had no involvement with or control over the preclinical and clinical development of FPI-2265 to date. We have relied on RadioMedix having conducted such research and development in accordance with the applicable protocol, legal, regulatory and scientific standards, having accurately reported the results of all clinical trials conducted prior to our agreement with RadioMedix and having correctly collected and interpreted the data from these trials. To the extent any of these has not occurred, expected development time and costs may be increased which could adversely affect any future revenue from this drug candidate.

We may also acquire or in-license additional drug candidates for preclinical or clinical development in the future as we continue to build our pipeline. The risks associated with acquiring or in-licensing current or future drug candidates could result in delays in the commencement or completion of our preclinical studies and clinical trials, if ever, and our ability to generate revenues from our drug candidates may be delayed.

We have never commercialized a product candidate and may experience delays or unexpected difficulties in obtaining regulatory approval for our current and future product candidates.

We have never obtained regulatory approval for, or commercialized, a biologic or drug. It is possible that the FDA may refuse to accept any or all of our planned BLAs or NDAs for substantive review or may conclude after review of our data that our application is insufficient to obtain regulatory approval for any product candidates. If the FDA does not approve any of our planned BLAs or NDAs, it may require that we conduct additional costly clinical trials, preclinical studies or manufacturing validation studies before it will reconsider our applications. Depending on the extent of these or any other FDA-required studies, approval of any BLA, NDA, or other application that we submit may be significantly delayed, possibly for several years, or may require us to expend more resources than we have available. Any failure or delay in obtaining regulatory approvals would prevent us from commercializing our product candidates, generating revenues and achieving and sustaining profitability. It is also possible that additional studies, if performed and completed, may not be considered sufficient by the FDA to approve any BLA, NDA, or other application that we submit. If any of these outcomes occur, we may be forced to abandon the development of our product candidates, which would materially adversely affect our business and could potentially cause us to cease operations. We face similar risks for our applications in foreign jurisdictions.

Since the number of patients that we plan to enroll in our ongoing Phase 1 clinical trials are small, the results from such clinical trials, once completed, may be less reliable than results achieved in larger clinical trials, which may hinder our efforts to obtain regulatory approval for our product candidates.

In our planned and ongoing Phase 1 clinical trials, we are evaluating the safety and tolerability of our product candidates to determine the maximum tolerated dose of such product candidate. The preliminary results of clinical trials with smaller sample sizes can be disproportionately influenced by various biases associated with the conduct of small clinical trials, such as the potential failure of the smaller sample size to accurately depict the features of the broader patient population, which limits the ability to generalize the results across a broader community, thus making the clinical trial results less reliable than clinical trials with a larger number of patients. In addition, our tumor agnostic clinical trial designs, together with the small sample size, may not allow us to enroll a sufficient number of patients with tumor types most likely to respond to our treatment. As a result, there may be less certainty that such product candidates would achieve a statistically significant effect in any future clinical trials. If we conduct any future clinical trials of our product candidates with a larger sample size, we may not achieve a statistically significant result or the same level of statistical significance, if any, that we might have anticipated based on the results observed in our initial Phase 1 clinical trials.

Our product candidates may cause adverse events, undesirable side effects or have other properties that could halt their preclinical or clinical development, prevent, delay, or cause the withdrawal of their regulatory approval, limit their commercial potential, or result in significant negative consequences, including death of patients. If any of our product candidates receive marketing approval and we, or others, later discover that the drug is less effective than previously believed or causes undesirable side effects that were not previously identified, our ability, or that of any potential future collaborators, to market the biologic or drug could be compromised.

As with most biologic and drug products, use of our product candidates could be associated with undesirable side effects or adverse events which can vary in severity from minor reactions to death and in frequency from infrequent to prevalent. Undesirable side effects or unacceptable toxicities caused by our product candidates could cause us or regulatory authorities to interrupt, delay, or halt clinical trials.

Treatment-related undesirable side effects or adverse events could also affect patient recruitment or the ability of enrolled subjects to complete the trial, or could result in potential product liability claims. In addition, these side effects may not be appropriately or timely recognized or managed by the treating medical staff, particularly outside of the research institutions that collaborate with us. We expect to have to educate and train medical personnel using our product candidates to understand their side effect profiles, both for our Phase

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1 clinical trials and any future clinical trials and upon any commercialization of any product candidates. Inadequate training in recognizing or managing the potential side effects of our product candidates could result in adverse events to patients, including death. Any of these occurrences may materially and adversely harm our business, financial condition, results of operations and prospects.

Clinical trials of our product candidates must be conducted in carefully defined subsets of patients who have agreed to enter into clinical trials. Consequently, it is possible that our clinical trials, or those of any potential future collaborator, may indicate an apparent positive effect of a product candidate that is greater than the actual positive effect, if any, or alternatively fail to identify undesirable side effects. If one or more of our product candidates receives marketing approval and we, or others, discover that the drug is less effective than previously believed or causes undesirable side effects that were not previously identified, including during any long-term follow-up observation period recommended or required for patients who receive treatment using our products, a number of potentially significant negative consequences could result, including:

•regulatory authorities may withdraw approvals of such product, seize the product, or seek an injunction against its manufacture or distribution;

•we, or any future collaborators, may be required to recall the product, change the way such product is administered to patients or conduct additional clinical trials;

•additional restrictions may be imposed on the marketing of, or the manufacturing processes for, the particular product;

•regulatory authorities may require additional warnings on the label, such as a “black box” warning or a contraindication, or impose distribution or use restrictions;

•we, or any future collaborators, may be required to create a Risk Evaluation and Mitigation Strategy, or REMS, which could include a medication guide outlining the risks of such side effects for distribution to patients, a communication plan for healthcare providers, and/or other elements to assure safe use;

•we, or any future collaborators, may be subject to fines, injunctions or the imposition of civil or criminal penalties;

•we, or any future collaborators, could be sued and held liable for harm caused to patients;

•the drug may become less competitive; and

•our reputation may suffer.

Any of the foregoing could prevent us from achieving or maintaining market acceptance of the particular product candidate, if approved, and could significantly harm our business, results of operations, and prospects, and could adversely impact our financial condition, results of operations or the market price of our common shares.

Our business may be adversely affected by a pandemic, epidemic or outbreak of an infectious disease, such as the COVID-19 pandemic.

Our business could be adversely affected by health epidemics in regions where we have concentrations of clinical trial sites or other business activities and could cause significant disruption in the operations of third-party contract manufacturers and contract research organizations upon whom we rely, as well as our ability to recruit patients for our clinical trials. For example, the COVID-19 pandemic had unpredictable impacts on global societies, economies, financial markets, and business practices around the world.

We experienced some temporary delays or disruptions due to the COVID-19 pandemic, including pauses in and delays to patient dosing, limited or reduced patient access to ICU beds, hospitals and healthcare resources generally, delayed initiation of new clinical trial sites and limited on-site personnel support at various trial sites. In addition, certain of our third-party manufacturers and suppliers paused their operations in the early stages of the pandemic, and some paused their operations again as additional waves of the COVID-19 pandemic impacted local communities and/or as a result of national and local regulations.

In the event of another pandemic, epidemic or other outbreak of an infectious disease, we would actively monitor and manage our response and evaluate the actual and potential impacts to our business operations, including on our ongoing and planned clinical trials. We would work closely with our third-party vendors, collaborators, and other parties in order to seek to advance our programs and pipeline of product candidates, while keeping the health and safety of our employees and their families, partners, third-party vendors, healthcare providers, patients and communities a top priority.

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The market opportunities for our product candidates may be smaller than we anticipated or may be limited to those patients who are ineligible for or have failed prior treatments. If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

Our current and future target patient populations are based on our beliefs and estimates regarding the incidence or prevalence of certain types of cancers that may be addressable by our product candidates, which is derived from a variety of sources, including scientific literature and surveys of clinics. Our projections may prove to be incorrect and the number of potential patients may turn out to be lower than expected. Even if we obtain significant market share for our product candidates, because the potential target populations could be small, we may never achieve profitability without obtaining regulatory approval for additional indications, including use of our product candidates for front-line and second-line therapy.

We expect to initially seek approval of some of our product candidates as second- or third-line therapies for patients who have failed other approved treatments. Subsequently, for those product candidates that prove to be sufficiently beneficial, if any, we would expect to seek approval as a second-line therapy and potentially as a front-line therapy, but there is no guarantee that our product candidates, even if approved for third-line therapy, would be approved for second-line or front-line therapy. In addition, we may have to conduct additional clinical trials prior to gaining approval for second-line or front-line therapy.

We may encounter difficulties enrolling patients in our clinical trials, and our clinical development activities could thereby be delayed or otherwise adversely affected.

The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the trial until its conclusion. We may experience difficulties in patient enrollment in our clinical trials for a variety of reasons, including:

•the size and nature of the patient population;

•the patient eligibility criteria defined in the protocol;

•the size of the trial population required for analysis of the trial’s primary endpoints;

•the proximity of patients to trial sites;

•the design of the trial;

•our ability to recruit clinical trial investigators with the appropriate competencies and experience;

•competing clinical trials for similar therapies or other new therapeutics not involving our product candidates and/or related technologies;

•clinicians’ and patients’ perceptions as to the potential advantages and side effects of alpha therapies of the product candidate being studied in relation to other available therapies, including any new drugs or treatments that may be approved for the indications we are investigating;

•our ability to obtain and maintain patient consents; and

•the risk that patients enrolled in clinical trials will not complete a clinical trial.

In addition, our clinical trials will compete with other clinical trials for product candidates that are in the same therapeutic areas as our product candidates, and this competition will reduce the number and types of patients available to us, because some patients who might have opted to enroll in our trials may instead opt to enroll in a trial being conducted by one of our competitors. We may conduct some of our clinical trials at the same clinical trial sites that some of our competitors use, which will reduce the number of patients who are available for our clinical trials at such clinical trial sites. Moreover, because our product candidates represent a departure from more commonly used methods for cancer treatment, potential patients and their doctors may be inclined to only use conventional therapies, such as chemotherapy and external beam radiation, rather than enroll patients in any future clinical trial.

Even if we are able to enroll a sufficient number of patients in our clinical trials, delays in patient enrollment may result in increased costs or may affect the timing or outcome of the planned clinical trials, which could prevent completion of these trials and adversely affect our ability to advance the development of our product candidates.

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We currently have no marketing and sales organization and have no experience in marketing products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell our product candidates, if approved for commercial sale, we may not be able to generate product revenue.

We currently have no sales, marketing or distribution capabilities and have no experience in marketing products. We intend to develop an in-house marketing organization and sales force, which will require significant capital expenditures, management resources and time. We will have to compete with other pharmaceutical and biotechnology companies to recruit, hire, train and retain marketing and sales personnel.

If we are unable or decide not to establish internal sales, marketing and distribution capabilities, we will pursue collaborative arrangements regarding the sales and marketing of our products, if licensed. However, there can be no assurance that we will be able to establish or maintain such collaborative arrangements, or if we are able to do so, that they will have effective sales forces. Any revenue we receive will depend upon the efforts of such third parties, which may not be successful. We may have little or no control over the marketing and sales efforts of such third parties and our revenue from product sales may be lower than if we had commercialized our product candidates ourselves. We also face competition in our search for third parties to assist us with the sales and marketing efforts of our product candidates.

There can be no assurance that we will be able to develop in-house sales and distribution capabilities or establish or maintain relationships with third-party collaborators to commercialize any product in the United States or in other jurisdictions for which we are able to obtain regulatory approval.

We may expend our resources to pursue a particular product candidate and forgo the opportunity to capitalize on product candidates or indications that may ultimately be more profitable or for which there is a greater likelihood of success.

We have limited financial and personnel resources and are placing significant focus on the development of our lead product candidates, and as such, we may forgo or delay pursuit of opportunities with other future product candidates that later prove to have greater commercial potential. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities. Our spending on current and future research and development programs and other future product candidates for specific indications may not yield any commercially viable future product candidates. For example, in May 2023, we announced that we had ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision. If we do not accurately evaluate the commercial potential or target market for a particular future product candidate, we may relinquish valuable rights to those future product candidates through collaboration, licensing or other royalty arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to such future product candidates.

We currently conduct and may in the future conduct clinical trials for our product candidates outside the United States, and the FDA and similar foreign regulatory authorities may not accept data from such trials.

We are currently conducting clinical trials in Canada and may in the future choose to conduct additional clinical trials outside the United States, including in Australia, Europe or other foreign jurisdictions. The acceptance of trial data from clinical trials conducted outside the United States by the FDA may be subject to certain conditions. In cases where data from clinical trials conducted outside the United States are intended to serve as the sole basis for marketing approval in the United States, the FDA will generally not approve the application on the basis of foreign data alone unless (i) the data are applicable to the United States population and United States medical practice; (ii) the trials were performed by clinical investigators of recognized competence; and (iii) the data may be considered valid without the need for an on-site inspection by the FDA or, if the FDA considers such an inspection to be necessary, the FDA is able to validate the data through an on-site inspection or other appropriate means. Additionally, the FDA’s clinical trial requirements, including sufficient size of patient populations and statistical powering, must be met. Many foreign regulatory bodies have similar approval requirements. In addition, such foreign trials would be subject to the applicable local laws of the foreign jurisdictions where the trials are conducted. There can be no assurance that the FDA or any similar foreign regulatory authority will accept data from trials conducted outside of the United States or the applicable jurisdiction. If the FDA or any similar foreign regulatory authority does not accept such data, it would result in the need for additional trials, which would be costly and time-consuming and delay aspects of our business plan, and which may result in our product candidates not receiving approval or clearance for commercialization in the applicable jurisdiction.

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Risks Related to Our Reliance on Third Parties and Manufacturing

Presently, some of our product candidates are biologics and the manufacture of such product candidates is complex. Currently, and even after the future completion of the construction of our own manufacturing facility, we rely, and will continue to rely, on third parties to manufacture our lead product candidates for our ongoing clinical trials and our preclinical studies as well as any preclinical studies or clinical trials of our future product candidates that we may conduct. We also expect to rely on third parties for the commercial manufacturing process of our product candidates, if approved. Our business could be harmed if those third parties fail to provide us with sufficient quantities of product supplies or product candidates, or fail to do so at acceptable quality levels or prices.

Presently, some of our product candidates are biologics and the process of manufacturing them is complex, highly regulated and subject to multiple risks. As a result of these complexities, the cost to manufacture biologics is generally higher than traditional small molecule chemical compounds, and the manufacturing process for biologics is less reliable and is more difficult to reproduce. In addition, manufacturing our product candidates will require many reagents, which are substances used in our manufacturing processes to bring about chemical or biological reactions, and other specialty materials and equipment, some of which are manufactured or supplied by small companies with limited resources and experience to support commercial biologics production. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects, and other supply disruptions. If microbial, viral or other contaminations are discovered in our product candidates or in the manufacturing facilities in which our product candidates are made, such manufacturing facilities may need to be closed for an extended period of time to investigate and remedy the contamination. We cannot assure you that any stability failures or other issues relating to the manufacture of our product candidates will not occur in the future. Further, as product candidates are developed through preclinical to late-stage clinical trials towards approval and commercialization, it is common that various aspects of the development program, such as manufacturing methods, are altered along the way in an effort to optimize processes and results. Such changes carry the risk that they will not achieve these intended objectives, and any of these changes could cause our product candidates to perform differently and affect the results of planned clinical trials or other future clinical trials.

Although we are currently in the process of establishing our own manufacturing facility, we currently intend to continue to rely on outside vendors to manufacture supplies and process our product candidates for preclinical studies and clinical trials under the guidance of our management team. Our manufacturing process may be more difficult or expensive than the approaches currently in use. We may make changes as we work to optimize the manufacturing process, and we cannot be sure that even minor changes in the process will not result in significantly different products that may not be as safe and effective as any product candidates deployed by our third-party research institution collaborators.

We are substantially dependent on third-party entities for supply our raw material and manufacturing. To date, we have obtained the actinium for our Phase 1 clinical trials from the U.S. Department of Energy, or DoE. The raw material for our TATs is shipped to third-party CDMOs, which manufacture the product candidate. In December 2020, we entered into a collaboration agreement and supply agreement with the TRIUMF entities for the development, production and supply of 225Ac to us which was amended in August 2021. Under the agreement, we will invest up to $20.0 million CAD in TRIUMF for the advancement of processes, technology and intellectual property around the manufacture of 225Ac along with preferred access and pricing to 225Ac. In June 2022, we announced that we entered into a collaboration and supply agreement with Niowave, Inc., or Niowave, for the development, production, and supply of 225Ac. Under the agreement, we will invest up to $5 million in Niowave to further develop their technology to increase current production capacity of 225Ac, and in return we will have guaranteed access to a pre-determined percentage of Niowave’s capacity of the resulting 225Ac, as well as preferred access to any excess supply produced. In January 2023, we announced that we entered into a supply agreement with BWXT Medical Ltd., or BWXT, for the supply of 225Ac. TRIUMF, Niowave and BWXT may not be able to supply us with 225Ac at the level of production to meet our clinical or commercial needs. We may also be unable to enter into supply agreements with other third parties for the supply of 225Ac at the level of production to meet our clinical or commercial needs.

Even after we establish our own manufacturing facility, we expect to rely on third-party manufacturers or third-party collaborators for the manufacture of our product candidates and for commercial supply of any of our product candidates for which we or any of our potential future collaborators obtain marketing approval. We may be unable to maintain agreements with our existing third-party manufacturers, or to establish additional agreements with third-party manufacturers or to do so on acceptable terms. Even if we are able to establish agreements with third-party manufacturers, reliance on third-party manufacturers entails additional risks, including:

•the number of potential manufacturers is limited and any new manufacturers are subject to the FDA’s review and approval of a supplemental BLA or NDA. This approval would require new testing and may require pre-approval inspections of the new manufacturer by the FDA. In addition, a new manufacturer would have to be educated in, or develop substantially equivalent processes for, production of our products;

•our third-party manufacturers might be unable to timely manufacture our product or produce the quantity and quality required to meet our clinical and commercial needs, if any;

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•our third-party manufacturers may not be able to execute our manufacturing procedures and other logistical support requirements appropriately;

•our third-party manufacturers may not perform as agreed, according to our schedule or specifications, or at all, may not devote sufficient resources to our product candidates, may give greater priority to the supply of other products over our product candidates, or may not remain in the contract manufacturing business for the time required to supply our clinical trials or to successfully produce, store, and distribute our products;

•our third-party manufacturers are subject to ongoing periodic unannounced inspection by the FDA and corresponding state agencies, and similar foreign regulatory authorities to ensure strict compliance with cGMPs and other government regulations and corresponding foreign standards. We do not have control over third-party manufacturers’ compliance with these and/or any other applicable regulations and standards;

•we may not own, or may have to share, the intellectual property rights to any improvements made by our third-party manufacturers in the manufacturing process for our products;

•our third-party manufacturers could breach, terminate or not renew their agreement with us at a time that is costly or inconvenient for us;

•clinical and, if approved, commercial supplies for the raw materials and components used to manufacture and process our product candidates, particularly those for which we have no other source or supplier, may not be available or may not be suitable or acceptable for use due to material or component defects;

•the possible mislabeling of clinical supplies, potentially resulting in the wrong dose amounts being supplied or active drug or placebo not being properly identified;

•the possible misappropriation of our proprietary information, including our trade secrets and know-how;

•the possibility of clinical supplies not being delivered to clinical sites on time, leading to clinical trial interruptions, or of drug supplies not being distributed to commercial vendors in a timely manner, resulting in lost sales; and

•our third-party manufacturers may have unacceptable or inconsistent product quality success rates and yields.

In addition, if any third-party manufacturer with whom we contract fails to perform its obligations, we may be forced to manufacture the materials ourselves, for which we currently do not have the capabilities or resources, or enter into an agreement with a different third-party manufacturer, which we may not be able to do on reasonable terms, if at all. In either scenario, our clinical trials supply could be delayed significantly as we establish alternative supply sources. In some cases, the technical skills required to manufacture our products or product candidates may be unique or proprietary to the original third-party manufacturer and we may have difficulty, or there may be contractual restrictions prohibiting us from, transferring such skills to a back-up or alternate supplier, or we may be unable to transfer such skills at all. In addition, if we are required to change our third-party manufacturer for any reason, we will be required to verify that the new third-party manufacturer maintains facilities and procedures that comply with quality standards and with all applicable regulations. We will also need to verify, such as through a manufacturing comparability study, that any new manufacturing process will produce our product candidate according to the specifications previously submitted to the FDA or another regulatory authority. The delays associated with the verification of a new third-party manufacturer could negatively affect our ability to develop product candidates or commercialize our products in a timely manner or within budget. Furthermore, a third-party manufacturer may possess technology related to the manufacture of our product candidate that such third-party manufacturer owns independently. This would increase our reliance on such third-party manufacturers or require us to obtain a license from such third-party manufacturer in order to have another third-party manufacturer manufacture our product candidates. In addition, changes in manufacturers often involve changes in manufacturing procedures and processes, which could require that we conduct bridging studies between our prior clinical supply used in our clinical trials and that of any new manufacturer. We may be unsuccessful in demonstrating the comparability of clinical supplies which could require the conduct of additional clinical trials.

Our third-party manufacturers and clinical reagent suppliers may be subject to damage or interruption from, among other things, fire, natural or man-made disaster, power loss, telecommunications failure, unauthorized entry, computer viruses, denial-of-service attacks, acts of terrorism, human error, vandalism or sabotage, financial insolvency, bankruptcy and similar events.

Each of these risks could delay or prevent the completion of our ongoing and future clinical trials or the approval of any of our product candidates by the FDA or similar foreign regulatory authorities, resulting in higher costs or adversely impact commercialization of our product candidates. Any shortages in the supply of such raw materials used in the manufacture of our product candidates could delay or prevent the completion of our clinical trials or the approval of any of our product candidates by the FDA or similar foreign regulatory authorities, resulting in higher costs or adversely impact commercialization of our product candidates. In addition, we may rely on third parties to perform certain specification tests on our product candidates prior to delivery to patients. If these tests are not

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appropriately done and test data are not reliable, patients could be put at risk of serious harm and the FDA or similar foreign regulatory authorities could place significant restrictions on our company until deficiencies are remedied.

The facilities used by our contract manufacturers to manufacture our product candidates may be subject to inspections that will be conducted after we submit our BLA or NDA to the FDA. We do not have complete control over all aspects of the manufacturing process of, and are dependent on, our contract manufacturing partners for compliance with cGMP regulations. Any product candidates that we may develop may compete with product candidates of other companies for access to manufacturing facilities. There are a limited number of manufacturers that operate under cGMP regulations and that might be capable of manufacturing for us. In order to advance many of our current or future products through further stages of clinical development, we will need to produce the Fast-Clear linker and bifunctional chelate in compliance with cGMP regulations, or find a third-party manufacturer that is capable of doing so. Our failure, or the failure of our third-party manufacturers, to comply with applicable regulations could result in sanctions being imposed on us, including fines, injunctions, civil penalties, delays, suspension or withdrawal of approvals, license revocation, seizures or recalls of product candidates or drugs, operating restrictions and criminal prosecutions, any of which could significantly and adversely affect supplies of our drugs and harm our business and results of operations.

Our contract manufacturers’ failure to achieve and maintain high manufacturing standards, in accordance with applicable regulatory requirements, or the incidence of manufacturing errors, could result in patient injury or death, product shortages, product recalls or withdrawals, delays or failures in product testing or delivery, cost overruns or other problems that could seriously harm our business. Contract manufacturers often encounter difficulties involving production yields, quality control and quality assurance, as well as shortages of qualified personnel.

We are currently in the process of establishing our own manufacturing facility and infrastructure in addition to relying on CDMOs for the manufacture of our product candidates, which will be costly, time-consuming, and which may not be successful.

In June 2021, we entered into a lease agreement with Hamilton, Ontario-based McMaster University for approximately 27,000 square feet of space at our current headquarters for the purpose of establishing a manufacturing facility to supplement our existing agreements with CDMOs for the manufacture of drug substance and drug product for preclinical and clinical needs. We expect that construction of our own manufacturing facility will provide us with enhanced control of material supply for preclinical studies, clinical trials, and commercialization, enable more rapid implementation of process changes, and allow for better long-term margins if any of our product candidates successfully complete clinical trials and receive marketing approval.

We have no experience as a company in the construction or operation of a manufacturing facility and may never be successful in building our own manufacturing facility or capabilities. As a result, we will need to hire additional personnel to manage our operations and facilities and develop the necessary infrastructure to continue the research and development, manufacture and eventual commercialization, if approved, of our product candidates. We may encounter problems hiring and retaining the experienced scientific, quality control, and manufacturing personnel needed to operate our manufacturing processes, which could result in delays in production or difficulties in maintaining compliance with applicable regulatory requirements. Establishing and maintaining manufacturing operations may require a reallocation of other resources, particularly the time and attention of certain of our senior management, as well as potentially significant capital expenditures. If we fail to complete the planned facility in an efficient manner, or fail to recruit the required personnel and generally manage our growth effectively, the development and production of our product candidates could be curtailed or delayed. Even if we are successful, our manufacturing capabilities could be affected by cost-overruns, unexpected delays, equipment failures, labor shortages, natural disasters, power failures and numerous other factors that could prevent us from realizing the intended benefits of our manufacturing strategy and have a material adverse effect on our business.

Any problems in our manufacturing process or facilities could make us a less attractive collaborator for potential partners, including larger pharmaceutical companies and academic research institutions, which could limit our access to additional attractive development programs.

We do not have experience as a company managing a manufacturing facility.

Operating our own manufacturing facility will require significant resources, and we do not have experience as a company in managing a manufacturing facility. In part because of this lack of experience, we cannot be certain that our manufacturing plans will be completed on time, if at all, or if manufacturing of product candidates from our own manufacturing facility for our planned clinical trials will begin or be completed on time, if at all. In part because of our inexperience, we may have unacceptable or inconsistent product quality success rates and yields, and we may be unable to maintain adequate quality control, quality assurance, and qualified personnel. In addition, if we switch from our current contract manufacturers to our own manufacturing facility for one or more of our product candidates in the future, we may need to conduct additional preclinical studies to bridge our modified product candidates to earlier versions. Failure to successfully obtain and operate our planned manufacturing facility could adversely affect the commercial viability of our product candidates.

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We may be unable to obtain a sufficient supply of product candidates to support clinical development or at commercial scale.

We manufacture our product candidates for patients, on-demand, because of the decay of the radioisotopes used for both imaging (111In) and for therapy (225Ac). We have developed intellectual property, know-how and trade secrets related to the manufacturing process of 225Ac and our product candidates so that we can provide clinical candidates to the patients in a timely manner.

111In, is a key component of our imaging analogues. We source medical grade 111In from a single source. Currently, we believe there is sufficient supply of 111In to advance our ongoing and planned clinical trials, support additional trials we may undertake utilizing 111In and for commercialization of our product candidates. We continually evaluate 111In manufacturers and suppliers and intend to have redundant suppliers prior to the commercial launch of FPI-2265, FPI-1434, FPI-2059 or FPI-2068, if either is approved. While we consider 111In to be readily available, there can be no guarantee that we will be able to secure another 111In supplier or obtain on terms that are acceptable to us.

225Ac is a key component of our product candidates, as well as other product candidates that we might consider for development with the 225Ac payload. We are continually working to ensure that there are adequate quantities of 225Ac available today to meet our current needs; however, our present main supplier, the DoE, has encountered supply shortages which could affect our business operations and results of operations. In December 2020, we entered into a collaboration agreement and supply agreement with the TRIUMF entities for the development, production and supply of 225Ac to us which was amended in August 2021. In June 2022, we announced that we entered into a collaboration and supply agreement with Niowave, Inc., or Niowave, for the development, production, and supply of 225Ac. In January 2023, we announced that we entered into a supply agreement with BWXT Medical Ltd., or BWXT, for the supply of 225Ac.

In addition, our contract for supply of 225Ac from the DoE must be renewed upon the end of its term, and the current contract extends through December 2023. There can be no assurance that the DoE will renew the contract or that change its policies that allow for the sale of this isotope to us. Failure to acquire sufficient quantities of medical grade 225Ac would make it impossible to effectively complete clinical trials and to commercialize any 225Ac-based product candidates that we may develop and would materially harm our business.

Our ability to conduct clinical trials to advance our product candidates is dependent on our ability to manufacture our product candidates in a cGMP compliant manner. Currently, we are dependent on third-party manufacturers, although, on June 2, 2021, we announced that we had entered a 15-year lease agreement with Hamilton, Ontario-based McMaster University to build a cGMP-compliant radiopharmaceutical manufacturing facility. However, we do not expect this facility to be operational until 2024. In the meantime, we must rely on our third-party manufacturers and suppliers. These suppliers may not perform their contracted services or may breach or terminate their agreements with us. Our suppliers are subject to regulations and standards that are overseen by regulatory and government agencies and we have no control over our suppliers’ compliance to these standards. Failure to comply with regulations and standards may result in their inability to supply isotope could result in delays in our clinical trials, which could have a negative impact on our business. We expect to continue to rely on third-party suppliers as we currently do even after the expected completion of our manufacturing facility in 2024.

We rely on third parties to conduct our current and planned clinical trials and plan to rely on third parties to conduct future clinical trials. If these third parties do not properly and successfully carry out their contractual duties or meet expected deadlines, we may not be able to obtain regulatory approval of or commercialize our product candidates.

We depend and will continue to depend on independent investigators and collaborators, such as medical institutions, CROs, contract development and manufacturing organizations, or CDMOs, and strategic partners to conduct our preclinical studies and clinical trials, including our ongoing and planned Phase 1 clinical trials. We also expect to enlist independent investigators, such as medical institutions and a CRO in the clinical development of FPI-2265. We expect to have to negotiate budgets and contracts with CROs, trial sites and CDMOs which may result in delays to our development timelines and increased costs. We will rely heavily on these third parties over the course of our clinical trials, and we control only certain aspects of their activities. As a result, we will have less direct control over the conduct, timing and completion of these clinical trials and the management of data developed through clinical trials than would be the case if we were relying entirely upon our own staff. Nevertheless, we are responsible for ensuring that each of our studies is conducted in accordance with applicable protocol, legal and regulatory requirements and scientific standards, and our reliance on third parties does not relieve us of our regulatory responsibilities. We and these third parties are required to comply with good clinical practices, or GCPs, which are regulations and guidelines enforced by the FDA and similar foreign regulatory authorities for product candidates in clinical development. Regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of these third parties fail to comply with applicable GCP regulations, the clinical data generated in our clinical trials may be deemed unreliable and the FDA or similar foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that, upon inspection, such regulatory authorities will determine that any of our clinical trials comply with the GCP regulations. In addition, our clinical trials must be conducted with biologic

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or drug product produced under cGMP regulations, and will require a large number of test patients. Our failure or any failure by these third parties to comply with these regulations or to recruit a sufficient number of patients may require us to repeat clinical trials, which would delay the regulatory approval process. Moreover, our business may be implicated if any of these third parties violates federal or state fraud and abuse or false claims laws and regulations or healthcare privacy and security laws.

Any third parties conducting our clinical trials are not and will not be our employees and, except for remedies available to us under our agreements with such third parties, we cannot control whether or not they devote sufficient time and resources to our ongoing, clinical and preclinical product candidates. These third parties may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical trials or other drug development activities, which could affect their performance on our behalf. If these third parties do not successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols or regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to complete development of, obtain regulatory approval of or successfully commercialize our product candidates. As a result, our financial results and the commercial prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenue could be delayed.

Switching or adding third parties to conduct our clinical trials involves substantial cost and requires extensive management time and focus and may ultimately be unsuccessful. In addition, there is a natural transition period when a new third party commences work. As a result, delays occur, which can materially impact our ability to meet our desired clinical development timelines.

The strategic collaboration agreement with AstraZeneca is important to our business. We may depend on AstraZeneca or additional third parties for the development and commercialization of our other programs and future product candidates. Our current and future collaborators may control aspects of our clinical trials, which could result in delays or other obstacles in the commercialization of the product candidates we develop. If our collaborations are not successful, we may not be able to capitalize on the market potential of these product candidates.

Under the strategic collaboration agreement, the Collaboration Agreement, entered into between us and AstraZeneca UK Limited, or AstraZeneca, in October 2020, we and AstraZeneca will jointly discover, develop and commercialize next-generation alpha-emitting radiopharmaceuticals and combination therapies for the treatment of cancer by leveraging our TAT platform and expertise in radiopharmaceuticals with AstraZeneca’s portfolio of antibodies and cancer therapeutics. As an example, Fusion is jointly developing FPI-2068 with AstraZeneca under the companies' multi-asset collaboration agreement. FPI-2068 is a targeted alpha therapy designed to deliver actinium-225 to various solid tumors that express EGFR and cMET. For the combination therapies, the parties will evaluate potential combination strategies involving our existing assets, including our FPI-1434 product candidates, in combination with certain of AstraZeneca’s existing therapeutics for the treatment of various cancers. AstraZeneca is obligated to fully fund all research and development activities for the combination strategies.

Our current Collaboration Agreement poses, and potential future collaborations involving our product candidates may pose, the following risks to us:

•collaborators have significant discretion in determining the efforts and resources that they will apply to these collaborations;

•collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our products or product candidates;

•collaborators may not properly enforce, maintain or defend our intellectual property rights or may use our proprietary information in a way that gives rise to actual or threatened litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential litigation, or other intellectual property proceedings;

•disputes may arise between a collaborator and us that cause the delay or termination of the research, development or commercialization of the product candidate, or that result in costly litigation or arbitration that diverts management attention and resources;

•if a present or future collaborator of ours were to be involved in a business combination, the continued pursuit and emphasis on our product development or commercialization program under such collaboration could be delayed, diminished or terminated; and

•collaboration agreements may restrict our rights to independently pursue new product candidates.

As a result, if we enter into additional collaboration agreements and strategic partnerships or license our intellectual property or products, we may not be able to realize the benefit of such transactions if we are unable to successfully integrate them with our existing operations, which could delay our timelines or otherwise adversely affect our business. We also cannot be certain that we will achieve

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the revenue or specific income expected of the Collaboration Agreement, or future strategic collaboration and licenses, which would harm our business prospects and financial condition.

We and AstraZeneca can each terminate the strategic collaboration agreement under certain circumstances. Termination of the strategic collaboration agreement could prevent us from further developing or commercializing products directed to the molecular targets which are the subject of the strategic collaboration agreement and could prevent us from obtaining milestones and revenues for such product candidates. Any of these events would have a material adverse effect on our results of operations and financial condition.

If the antibody targets or de novo radioconjugates subject to the AstraZeneca Collaboration Agreement fail to advance or experience unacceptable safety or efficacy results if clinically developed, this could adversely impact the reputation of our Fast-Clear technology and our ability to engage in future collaborations.

If the antibody targets or novel TATs associated with the AstraZeneca Collaboration Agreement fail to advance into the clinic, or experience negative results with respect to safety, efficacy, manufacturability, or other features of research and development, this could adversely affect the reputation of our Fast-Clear linker technology and our ability to engage in future collaborations. To the extent these assets do not successfully advance through clinical development, this may impair our ability to leverage our platform or to further expand the use of our platform and generate future revenue, which could have a material adverse effect on our business.

We may form or seek additional collaborations or strategic alliances or enter into additional licensing arrangements in the future, and we may not realize the benefits of such collaborations, alliances or licensing arrangements.

We may form or seek additional strategic alliances, create joint ventures or collaborations, or enter into additional licensing arrangements with third parties that we believe will complement or augment our development and commercialization efforts with respect to our product candidates and any future product candidates that we may develop. Any of these relationships may require us to incur non-recurring and other charges, increase our near and long-term expenditures, issue securities that dilute our existing shareholders or disrupt our management and business.

In addition, we face significant competition in seeking appropriate strategic partners and the negotiation process is time-consuming and complex. We may not be successful in our efforts to establish a strategic partnership or other alternative arrangements for our product candidates because they may be deemed to be at too early of a stage of development for collaborative effort and third parties may not view our product candidates as having the requisite potential to demonstrate safety, potency and purity and obtain marketing approval.

Further, collaborations involving our product candidates are subject to numerous risks, which may include the following:

•collaborators have significant discretion in determining the efforts and resources that they will apply to a collaboration;

•collaborators may not pursue development and commercialization of our product candidates or may elect not to continue or renew development or commercialization of our product candidates based on clinical trial results, changes in their strategic focus due to the acquisition of competitive products, availability of funding or other external factors, such as a business combination that diverts resources or creates competing priorities;

•collaborators may delay clinical trials, provide insufficient funding for a clinical trial, stop a clinical trial, abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing;

•collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our product candidates;

•a collaborator with marketing and distribution rights to one or more products may not commit sufficient resources to their marketing and distribution;

•collaborators may not properly maintain or defend our intellectual property rights or may use our intellectual property or proprietary information in a way that gives rise to actual or threatened litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential liability;

•disputes may arise between us and a collaborator that cause the delay or termination of the research, development or commercialization of our product candidates, or that result in costly litigation or arbitration that diverts management attention and resources;

•collaborations may be terminated and, if terminated, may result in a need for additional capital to pursue further development or commercialization of the applicable product candidates; and

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•collaborators may own or co-own intellectual property covering our products that results from our collaborating with them, and in such cases, we would not have the exclusive right to commercialize such intellectual property.

As a result, if we enter into collaboration agreements and strategic partnerships or license our product candidates, we may not be able to realize the benefit of such transactions if we are unable to successfully integrate them with our existing operations and company culture, which could delay our timelines or otherwise adversely affect our business. We also cannot be certain that, following a strategic transaction or license, we will achieve the revenue or specific net income that justifies such transaction. Any delays in entering into new collaborations or strategic partnership agreements related to our product candidates could delay the development and commercialization of our product candidates in certain geographies for certain indications, which would harm our business, prospects, financial condition and results of operations.

If we or third parties, such as CROs or CDMOs, use hazardous and biological materials in a manner that causes injury or violates applicable law, we may be liable for damages.

Our research and development activities may involve the controlled use of potentially hazardous substances, including chemical and biological materials, by us or third parties, such as CROs and CDMOs. The use of 111In and 225Ac-labeled antibody treatments involves the inherent risk of exposure from gamma ray emissions, which can alter or harm healthy cells in the body. We and such third parties are subject to federal, state, provincial and local laws and regulations in the United States, Canada and other foreign jurisdictions governing the use, manufacture, storage, handling, and disposal of medical and hazardous materials. Although we believe that our and such third-parties’ procedures for using, handling, storing and disposing of these materials comply with legally prescribed standards, we cannot completely eliminate the risk of contamination or injury resulting from medical or hazardous materials. As a result of any such contamination or injury, we may incur liability or local, city, state, provincial or federal authorities may curtail the use of these materials and interrupt our business operations. In the event of an accident, we could be held liable for damages or penalized with fines, and the liability could exceed our resources. Compliance with applicable environmental laws and regulations is expensive, and current or future environmental regulations may impair our research, development and production efforts, which could harm our business, prospects, financial condition, or results of operations. We currently maintain insurance coverage for injuries resulting from the hazardous materials we use; however, future claims may exceed the amount of our coverage. Also, we do not have insurance coverage for pollution cleanup and removal. Currently the costs of complying with such federal, state, provincial, local and foreign environmental regulations are not significant, and consist primarily of waste disposal expenses. However, they could become expensive, and current or future environmental laws or regulations may impair our research, development, production and commercialization efforts.

Risks Related to Government Regulation

The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of our product candidates.

We have not previously submitted a BLA or NDA to the FDA or similar marketing applications to similar foreign regulatory authorities. A BLA or NDA must include extensive preclinical and clinical data and supporting information to establish the product candidate’s safety, purity and potency for biologics, or safety and effectiveness for drugs, for each desired indication. The BLA or NDA must also include significant information regarding the manufacturing controls for the product. We expect the novel nature of our product candidates to create further challenges in obtaining regulatory approval. For example, we believe any future BLAs will be reviewed primarily by the FDA’s Center for Drug Evaluation and Research, or CDER, but that CDER will seek consultation or review by the FDA’s Center for Biologics Evaluation and Research and Center for Devices and Radiological Health, or CDRH. In addition, we believe any future NDAs will be reviewed primarily by CDER, but that CDER will seek consultation or review by CDRH. Accordingly, the regulatory approval pathway for our product candidates may be uncertain, complex, expensive and lengthy, and regulatory approval may not be obtained.

Securing regulatory approval also requires the submission of information about the biologic and drug manufacturing process and inspection of manufacturing facilities by the relevant regulatory authority. The FDA or similar foreign regulatory authorities may fail to approve our manufacturing processes or facilities, whether run by us or our CDMOs. In addition, if we make manufacturing changes to our product candidates in the future, we may need to conduct additional preclinical studies to bridge our modified product candidates to earlier versions.

Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may ultimately lead to the denial of regulatory approval of our product candidates.

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We may seek orphan drug designation for product candidates we develop, and we may be unsuccessful or may be unable to maintain the benefits associated with orphan drug designation, including the potential for market exclusivity.

As part of our business strategy, we may seek orphan drug designation for any product candidates we develop, and we may be unsuccessful. Regulatory authorities in some jurisdictions, including the United States and Europe, may designate drugs and biologics for relatively small patient populations as orphan drugs. Under the Orphan Drug Act, the FDA may designate a drug or biologic as an orphan drug if it is a drug or biologic intended to treat a rare disease or condition, which is defined as a patient population of fewer than 200,000 individuals annually in the United States, or a patient population greater than 200,000 in the United States where there is no reasonable expectation that the cost of developing the drug or biologic will be recovered from sales in the United States. In the United States, orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages and user-fee waivers.

Similarly, in the EU, the European Commission grants orphan designation after receiving the opinion of the EMA Committee for Orphan Medicinal Products on an orphan designation application, if the sponsor for the product can establish that: (1) the product is intended for the diagnosis, prevention or treatment of a life-threatening or chronically debilitating condition; (2) either (i) such condition affects no more than five in 10,000 persons in the EU when the application is made, or (ii) it is unlikely that the product, without the benefits derived from orphan status, would generate sufficient return in the EU to justify the necessary investment in its development; and (3) there exists no satisfactory method of diagnosis, prevention or treatment of such condition authorized for marketing in the EU, or, if such a method exists, the product would be a significant benefit to those affected by that condition. In the EU, orphan designation entitles a party to a number of incentives, such as protocol assistance and scientific advice specifically for designated orphan medicinal products, and potential fee reductions depending on the status of the sponsor.

Generally, if a drug or biologic with an orphan drug designation subsequently receives the first marketing approval for the indication for which it has such designation, the drug or biologic is entitled to a period of marketing exclusivity, which precludes the European Medicines Agency, or EMA, or the FDA from approving another marketing application for the same drug and for the same indication during the period of exclusivity, except in limited circumstances. The applicable period is seven years in the United States and 10 years in the EU. The EU exclusivity period can be reduced to six years if a product no longer meets the criteria for orphan designation or if the product is sufficiently profitable such that market exclusivity is no longer justified.

Even if we obtain orphan drug exclusivity for a product candidate, that exclusivity may not effectively protect the product candidate from competition because different therapies can be approved for the same condition and the same therapies can be approved for different conditions but used off-label. Even after an orphan drug is approved, the FDA can subsequently approve the same drug for the same condition if the FDA concludes that the later drug or biologic is clinically superior in that it is shown to be safer, more effective or makes a major contribution to patient care. In addition, a designated orphan drug may not receive orphan drug exclusivity if it is approved for a use that is broader than the indication for which it received orphan designation. Moreover, orphan drug exclusive marketing rights in the United States may be lost if the FDA later determines that the request for designation was materially defective or if the manufacturer is unable to assure sufficient quantity of the drug or biologic to meet the needs of patients with the rare disease or condition. Orphan drug designation neither shortens the development time or regulatory review time of a drug or biologic nor gives the drug or biologic any advantage in the regulatory review or approval process. While we may seek orphan drug designation for applicable indications for our current and any future product candidates, we may never receive such designations. Even if we do receive such designation, there is no guarantee that we will enjoy the benefits of that designation.

A breakthrough therapy designation by the FDA, even if granted for any of our product candidates, may not lead to a faster development or regulatory review or approval process and it does not increase the likelihood that our product candidates will receive marketing approval.

We may seek breakthrough therapy designation for some or all of our future product candidates. A breakthrough therapy is defined as a drug or biologic that is intended, alone or in combination with one or more other drugs or biologics, to treat a serious or life-threatening disease or condition and preliminary clinical evidence indicates that the drug, or biologic, may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. For product candidates that have been designated as breakthrough therapies, sponsors may obtain more frequent interaction with and communication with the FDA to help to identify the most efficient path for clinical development. Drugs or biologics designated as breakthrough therapies by the FDA may also be eligible for other expedited approval programs, including accelerated approval.

Designation as a breakthrough therapy is within the discretion of the FDA. Accordingly, even if we believe one of our product candidates meets the criteria for designation as a breakthrough therapy, the FDA may disagree and instead determine not to make such designation. In any event, the receipt of a breakthrough therapy designation for a product candidate may not result in a faster development process, review or approval and does not assure ultimate approval by the FDA. In addition, even if one or more of our product candidates

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qualify as breakthrough therapies, the FDA may later decide that the product no longer meets the conditions for qualification. As such, even though we intend to seek breakthrough therapy designation for FPI-1434 and some or all of our future product candidates for the treatment of advanced solid tumors, there can be no assurance that we will receive breakthrough therapy designation or that even if we do receive it, that such designation will have a material impact on our development program.

A fast track designation by the FDA, even if granted for our current product candidates, or any other future product candidates, may not lead to a faster development or regulatory review or approval process and does not increase the likelihood that our product candidates will receive marketing approval.

If a drug or biologic is intended for the treatment of a serious or life-threatening condition and the product demonstrates the potential to address unmet medical needs for this condition, the sponsor may apply for FDA fast track designation for a particular indication. We may seek fast track designation for certain of our current or future product candidates, but there is no assurance that the FDA will grant this status to any of our proposed product candidates. If granted, fast track designation makes a product eligible for more frequent interactions with FDA to discuss the development plan and clinical trial design, as well as rolling review of the application, which means that the company can submit completed sections of its marketing application for review prior to completion of the entire submission. Marketing applications of products candidates with fast track designation may qualify for priority review under the policies and procedures offered by the FDA, but the fast track designation does not assure any such qualification or ultimate marketing approval by the FDA. The FDA has broad discretion whether or not to grant fast track designation, so even if we believe a particular product candidate is eligible for this designation, there can be no assurance that the FDA would decide to grant it. Even if we do receive fast track designation, we may not experience a faster development process, review or approval compared to conventional FDA procedures, and receiving a fast track designation does not provide any assurance of ultimate FDA approval. In addition, the FDA may withdraw fast track designation if it believes that the designation is no longer supported by data from our clinical development program. In addition, the FDA may withdraw any fast track designation at any time.

Accelerated approval by the FDA, even if granted for our current product candidates, or any other future product candidates, may not lead to a faster development or regulatory review or approval process and it does not increase the likelihood that our product candidates will receive marketing approval.

We may seek accelerated approval of our current or future product candidates. A product may be eligible for accelerated approval if it treats a serious or life-threatening condition and generally provides a meaningful advantage over available therapies. In addition, it must demonstrate an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, or IMM, that is reasonably likely to predict an effect on IMM or other clinical benefit. As a condition of approval, the FDA may require that a sponsor of a drug or biologic receiving accelerated approval perform adequate and well-controlled post-marketing clinical trials, and, under the Food and Drug Omnibus Reform Act of 2022, or FDORA, the FDA is now permitted to require, as appropriate, that such trials be underway prior to approval or within a specific time period after the date of approval for a product granted accelerated approval. Under FDORA, the FDA has increased authority for expedited procedures to withdraw approval of a drug or indication approved under accelerated approval if, for example, the confirmatory trial fails to verify the predicted clinical benefit of the product.. In addition, the FDA currently requires, unless otherwise informed by the agency, pre-approval of promotional materials for products receiving accelerated approval, which could adversely impact the timing of the commercial launch of the product. Thus, even if we seek to utilize the accelerated approval pathway, we may not be able to obtain accelerated approval and, even if we do, we may not experience a faster development, regulatory review or approval process for that product. In addition, receiving accelerated approval does not assure that the product will eventually be converted to a traditional approval.

We may seek designated platform technology designation for our TAT platform technology, but we might not receive such designation, and even if we do, such designation may not lead to a faster regulatory review or approval process.

We may seek designated platform technology designation for our TAT platform technology. Under FDORA, a platform technology incorporated within or utilized by a drug or biological product is eligible for designation as a designated platform technology if (1) the platform technology is incorporated in, or utilized by, a drug approved under an NDA or BLA; (2) preliminary evidence submitted by the sponsor of the approved or licensed drug, or a sponsor that has been granted a right of reference to data submitted in the application for such drug, demonstrates that the platform technology has the potential to be incorporated in, or utilized by, more than one drug without an adverse effect on quality, manufacturing, or safety; and (3) data or information submitted by the applicable person indicates that incorporation or utilization of the platform technology has a reasonable likelihood to bring significant efficiencies to the drug development or manufacturing process and to the review process. A sponsor may request the FDA to designate a platform technology as a designated platform technology concurrently with, or at any time after, submission of an IND for a drug that incorporates or utilizes the platform technology that is the subject of the request. If so designated, the FDA may expedite the development and review of any subsequent original NDA or BLA for a drug that uses or incorporates the platform technology. Designated platform technology designation is within the discretion of the FDA. Accordingly, even if we believe our TAT platform technology meets the criteria for

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such designation, the FDA may disagree and instead determine not to grant such designation. In addition, the receipt of designated platform technology designation for a platform technology does not ensure that a drug will be developed more quickly or receive FDA approval. Moreover, the designated platform technology designation may be withdrawn by the FDA if the FDA believes that the designation no longer meets the criteria for such designation.

If we are unable to successfully develop, validate and obtain regulatory approval for companion diagnostic tests for our product candidates that require or would commercially benefit from such tests, or experience significant delays in doing so, we may not realize the full commercial potential of these product candidates.

In connection with the clinical development of our product candidates for certain indications, we may work with collaborators to develop or obtain access to in vitro or in vivo companion diagnostic tests to identify patient subsets within a disease category who may derive selective and meaningful benefit from our product candidates. Such companion diagnostics would be used during our clinical trials as well as in connection with the commercialization of our product candidates. To be successful, we or our collaborators will need to address a number of scientific, technical, regulatory and logistical challenges. The FDA and similar foreign regulatory authorities regulate in vitro companion diagnostics as medical devices and, under that regulatory framework, will likely require the conduct of clinical trials to demonstrate the safety and effectiveness of any diagnostics we may develop, which we expect will require separate regulatory clearance or approval prior to commercialization.

We may rely on third parties for the design, development and manufacture of companion diagnostic tests for our therapeutic product candidates that may require such tests. If we enter into such collaborative agreements, we will be dependent on the sustained cooperation and effort of our future collaborators in developing and obtaining approval for these companion diagnostics. It may be necessary to resolve issues, such as selectivity/specificity, analytical validation, reproducibility or clinical validation of companion diagnostics, during the development and regulatory approval processes. Moreover, even if data from preclinical studies and early clinical trials appear to support development of a companion diagnostic for a product candidate, data generated in later clinical trials may fail to support the analytical and clinical validation of the companion diagnostic. We and our future collaborators may encounter difficulties in developing, obtaining regulatory approval for, manufacturing and commercializing companion diagnostics similar to those we face with respect to our therapeutic candidates themselves, including issues with achieving regulatory clearance or approval, production of sufficient quantities at commercial scale and with appropriate quality standards, and in gaining market acceptance. If we are unable to successfully develop companion diagnostics for these therapeutic product candidates, or experience delays in doing so, the development of these therapeutic product candidates may be adversely affected, these therapeutic product candidates may not obtain marketing approval, and we may not realize the full commercial potential of any of these therapeutics that obtain marketing approval. As a result, our business, results of operations and financial condition could be materially harmed. In addition, a diagnostic company with whom we contract may decide to discontinue selling or manufacturing the companion diagnostic test that we anticipate using in connection with development and commercialization of our product candidates or our relationship with such diagnostic company may otherwise terminate. We may not be able to enter into arrangements with another diagnostic company to obtain supplies of an alternative diagnostic test for use in connection with the development and commercialization of our product candidates or do so on commercially reasonable terms, which could adversely affect and/or delay the development or commercialization of our therapeutic candidates.

If approved, our investigational products regulated as biologics may face competition from biosimilars approved through an abbreviated regulatory pathway sooner than anticipated.

The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010, or collectively the ACA, includes a subtitle called the Biologics Price Competition and Innovation Act of 2009, or BPCIA, which created an abbreviated approval pathway for biological products that are biosimilar to or interchangeable with an FDA-licensed reference biological product. Under the BPCIA, an application for a biosimilar product may not be submitted to the FDA until four years following the date that the reference product was first licensed by the FDA. In addition, the approval of a biosimilar product may not be made effective by the FDA until 12 years from the date on which the reference product was first licensed. During this 12-year period of exclusivity, another company may still market a competing version of the reference product if the FDA approves a BLA for the competing product containing the sponsor’s own preclinical data and data from adequate and well-controlled clinical trials to demonstrate the safety, purity and potency of the other company’s product. The law is complex and is still being interpreted and implemented by the FDA. As a result, its ultimate impact, implementation and meaning are subject to uncertainty, and any processes adopted by the FDA to implement the BPCIA could have a material adverse effect on the future commercial prospects for our biological products.

We believe that any of our product candidates approved as a biological product under a BLA should qualify for the 12-year period of exclusivity. However, there is a risk that this exclusivity could be shortened due to congressional action or otherwise, or that the FDA will not consider our investigational medicines to be reference products for competing products, potentially creating the opportunity for generic competition sooner than anticipated. Other aspects of the BPCIA, some of which may impact the BPCIA exclusivity provisions, have also been the subject of recent litigation. Moreover, the extent to which a biosimilar, once licensed, will be substituted for any one

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of our reference products in a way that is similar to traditional generic substitution for non-biological products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still developing.

If competitors are able to obtain marketing approval for biosimilars referencing our products, our products may become subject to competition from such biosimilars, with the attendant competitive pressure and consequences.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not mean that we will be successful in obtaining regulatory approval of our product candidates in other jurisdictions.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not guarantee that we will be able to obtain or maintain regulatory approval in any other jurisdiction, while a failure or delay in obtaining regulatory approval in one jurisdiction may have a negative effect on the regulatory approval process in others. For example, even if the FDA grants marketing approval of a product candidate, similar foreign regulatory authorities must also approve the manufacturing, marketing and promotion of the product candidate in those countries. Approval and licensure procedures vary among jurisdictions and can involve requirements and administrative review periods different from, and greater than, those in the United States, including additional preclinical studies or clinical trials as clinical trials conducted in one jurisdiction may not be accepted by regulatory authorities in other jurisdictions. In many jurisdictions outside the United States, a product candidate must be approved for reimbursement before it can be approved for sale in that jurisdiction. In some cases, the price that we intend to charge for our products is also subject to approval.

We may also submit marketing applications in other countries. Regulatory authorities in jurisdictions outside of the United States have requirements for approval of product candidates with which we must comply prior to marketing in those jurisdictions. Obtaining similar foreign regulatory approvals and compliance with similar foreign regulatory requirements could result in significant delays, difficulties and costs for us and could delay or prevent the introduction of our products in certain countries. If we fail to comply with the regulatory requirements in international markets and/or receive applicable marketing approvals, our target market will be reduced and our ability to realize the full market potential of our product candidates will be harmed.

Disruptions at the FDA, the SEC and other government agencies caused by funding shortages or global health concerns could hinder their ability to hire and retain key leadership and other personnel, prevent new products and services from being developed or commercialized in a timely manner or otherwise prevent those agencies from performing normal business functions on which the operation of our business may rely, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes. Average review times at the agency have fluctuated in recent years as a result. In addition, government funding of the SEC and other government agencies on which our operations may rely, including those that fund research and development activities, is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs or biologics to be reviewed and/or approved by necessary government agencies, which would adversely affect our business. If a prolonged government shutdown occurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business.

Since March 2020 when foreign and domestic inspections of facilities were largely placed on hold, the FDA has been working to resume pre-pandemic levels of inspection activities, including routine surveillance, bioresearch monitoring and pre-approval inspections on a prioritized basis. Should FDA determine that an inspection is necessary for approval and an inspection cannot be completed during the review cycle due to restrictions on travel, and the FDA does not determine a remote interactive evaluation to be adequate, the agency has stated that it generally intends to issue, depending on the circumstances, a complete response letter or defer action on the application until an inspection can be completed. During the COVID-19 public health emergency, a number of companies announced receipt of complete response letters due to the FDA’s inability to complete required inspections for their applications. Regulatory authorities outside the U.S. may adopt similar restrictions or other policy measures in response to the COVID-19 pandemic and may experience delays in their regulatory activities.

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Even if we receive regulatory approval of our product candidates, we will be subject to ongoing regulatory obligations and continued regulatory review, which may result in significant additional expense and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated problems with our product candidates.

Following potential approval of any of our current or future product candidates, the FDA or similar foreign regulatory authorities may impose significant restrictions on a product’s indicated uses or marketing or impose ongoing requirements for potentially costly and time-consuming post-approval studies, post-market surveillance or clinical trials to monitor the safety and efficacy of the product. The FDA may also require a risk evaluation and mitigation strategy in order to license our product candidates, which could entail requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. In addition, if the FDA or similar foreign regulatory authority approves our product candidates, the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion, import, export and recordkeeping for our product candidates will be subject to extensive and ongoing regulatory requirements. These requirements include submissions of safety and other post-marketing information and reports, registration, as well as continued compliance with cGMPs and GCPs, for any clinical trials that we conduct post-approval. As such, we and our contract manufacturers will be subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in any BLA, NDA, other marketing application and previous responses to inspectional observations. Additionally, manufacturers and manufacturers’ facilities are required to comply with extensive FDA, and comparable foreign regulatory authority requirements, including ensuring that quality control and manufacturing procedures conform to cGMP regulations and applicable product tracking and tracing requirements. Further, under FDORA, sponsors of approved drugs and biologics must provide six months’ notice to the FDA of any changes in marketing status, such as the withdrawal of a drug, and failure to do so could result in the FDA placing the product on a list of discontinued products, which would revoke the product’s ability to be marketed. Later discovery of previously unknown problems with our product candidates, including adverse events of unanticipated severity or frequency, or with our third-party manufacturers or manufacturing processes, or failure to comply with regulatory requirements, may result in, among other things:

•restrictions on the marketing or manufacturing of our product candidates, withdrawal of the product from the market or voluntary or mandatory product recalls;

•revisions to the labeling, including limitation on approved uses or the addition of additional warnings, contraindications or other safety information, including boxed warnings;

•imposition of a REMS which may include distribution or use restrictions;

•requirements to conduct additional post-market clinical trials to assess the safety of the product;

•fines, warning or untitled letters or holds on clinical trials;

•refusal by the FDA or similar foreign regulatory authorities to approve pending applications or supplements to approved applications filed by us or suspension or revocation of license approvals;

•product seizure or detention, or refusal to permit the import or export of our product candidates; and

•injunctions or the imposition of civil or criminal penalties.

The FDA’s and similar regulatory authorities’ policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action, either in the United States or abroad. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained and we may not achieve or sustain profitability.

Our relationships with healthcare providers and physicians and third-party payors will be subject to applicable anti-kickback, fraud and abuse and other healthcare laws and regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm and diminished profits and future earnings.

We are subject to applicable fraud and abuse and other healthcare laws and regulations, including, without limitation, the U.S. federal Anti-Kickback Statute and the U.S. federal False Claims Act, or FCA, which may constrain the business or financial arrangements and relationships through which we sell, market and distribute our products. In particular, the promotion, sales and marketing of healthcare items and services, as well as certain business arrangements in the healthcare industry (e.g., healthcare providers, physicians and third-party payors), are subject to extensive laws designed to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, structuring and commission(s), certain customer incentive programs and other business arrangements generally. We also may be subject to patient information and privacy and security regulation by both the federal government and the states and foreign jurisdictions in which we

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conduct our business. The applicable federal, state and foreign healthcare laws and regulations laws that may affect our ability to operate include, but are not limited to:

•The Anti-Kickback Statute, which prohibits the knowing and willful offer, receipt or payment of remuneration in exchange for, or to induce or reward, the referral of patients or the use of products or services that would be paid for in whole or part by Medicare, Medicaid or other federal healthcare programs. Remuneration has been broadly defined to include anything of value, including but not limited to cash, improper discounts and free or reduced-price items and services. A person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation. Further, U.S. courts have found that if “one purpose” of remuneration is to induce referrals, the U.S. federal Anti-Kickback Statute is violated. The Anti-Kickback Statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on the one hand and prescribers, purchasers, and formulary managers on the other. There are a number of statutory exceptions and regulatory safe harbors protecting some common activities from prosecution; but the exceptions and safe harbors are drawn narrowly and require strict compliance in order to offer protection. A claim including items or services resulting from a violation of the U.S. federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the FCA. On December 2, 2020, the Office of Inspector General, or OIG, published further modifications to the federal Anti-Kickback Statute. Under the final rules, OIG added safe harbor protections under the Anti-Kickback Statute for certain coordinated care and value-based arrangements among clinicians, providers, and others. This rule (with exceptions) became effective January 19, 2021. Implementation of this change and new safe harbors for point-of-sale reductions in price for prescription pharmaceutical products and pharmacy benefit manager service fees are currently under review by the Biden administration and may be amended or repealed. Further, the Inflation Reduction Act of 2022, the IRA, delayed implementation of the new safe harbors for point-of-sale reductions in price for prescription pharmaceutical products and pharmacy benefit manager service fees until January 1, 2032.We continue to evaluate what effect, if any, the rule will have on our business. Many states have similar laws that apply to their state healthcare programs as well as private payors. Violations of anti-kickback and other applicable laws can result in exclusion from federal healthcare programs and substantial civil and criminal penalties for each violation, plus up to three times the amount of the false claims involved, and imprisonment.

•The U.S. federal civil and criminal false claims laws and civil monetary penalty laws, including the FCA, which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, false or fraudulent claims for payment to, or approval by Medicare, Medicaid, or other federal healthcare programs, knowingly making, using or causing to be made or used a false record or statement material to a false or fraudulent claim or an obligation to pay or transmit money to the federal government, or knowingly concealing or knowingly and improperly avoiding or decreasing or concealing an obligation to pay money to the federal government. The FCA has been used to prosecute persons submitting claims for payment that are inaccurate or fraudulent, that are for services not provided as claimed, or for services that are not medically necessary. The FCA includes a whistleblower provision that allows individuals to bring actions on behalf of the federal government and share a portion of the recovery of successful claims. Some U.S. state law equivalents of the above federal laws, such as the Anti-Kickback Statute and FCA, apply to items or services regardless of whether the good or service was reimbursed by a government program, so called all-payor laws. These all-payor laws could apply to our sales and marketing activities even if the Anti-Kickback Statute and FCA laws are inapplicable.

•The federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which created new federal criminal statutes that prohibit knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program or obtain, by means of false or fraudulent pretenses, representations, or promises, any of the money or property owned by, or under the custody or control of, any healthcare benefit program, regardless of the payor (e.g., public or private) and knowingly and willfully falsifying, concealing or covering up by any trick or device a material fact or making any materially false statements in connection with the delivery of, or payment for, healthcare benefits, items or services relating to healthcare matters. Similar to the U.S. federal Anti-Kickback Statute, a person or entity can be found guilty of violating HIPAA without actual knowledge of the statute or specific intent to violate it.

•HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009, or HITECH, and their implementing regulations, and as amended again by the Final HIPAA Omnibus Rule, published in January 2013, which imposes certain obligations, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information without appropriate authorization by covered entities subject to the rule, such as health plans, healthcare clearinghouses and certain healthcare providers, as well as their business associates that perform certain services involving the use or disclosure of individually identifiable health information also implicate our business. HITECH also created new tiers of civil monetary penalties, amended HIPAA to make civil and criminal penalties directly applicable to business associates, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts to enforce the federal HIPAA laws and seek attorneys’ fees and costs associated with pursuing federal civil actions.

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•The federal Physician Payment Sunshine Act, created under the ACA, and its implementing regulations, which require manufacturers of drugs, devices, biologicals and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program (with certain exceptions) to report annually to the Centers for Medicare & Medicaid Services, or CMS, within the United States Department of Health and Human Services, or HHS, information related to payments or other transfers of value made to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors) and teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members. Effective January 1, 2022, these reporting obligations will extend to include transfers of value made to certain non-physician providers such as physician assistants and nurse practitioners.

The scope and enforcement of each of these laws is uncertain and subject to rapid change in the current environment of healthcare reform, especially in light of the lack of applicable precedent and regulatory guidance. Federal and state enforcement bodies have recently increased their scrutiny of interactions between healthcare companies, healthcare providers and other third parties, including charitable foundations, which has led to a number of investigations, prosecutions, convictions and settlements in the healthcare industry. Responding to investigations can be time-and resource-consuming and can divert management’s attention from the business. Any such investigation or settlement could increase our costs or otherwise have an adverse effect on our business.

If our marketing or other arrangements were determined to violate anti-kickback or related laws, including the FCA or an all-payor law, then we could be subject to penalties, including administrative, civil and criminal penalties, damages, fines, disgorgement, the exclusion from participation in federal and state healthcare programs, individual imprisonment, reputational harm, and the curtailment or restructuring of our operations, as well as additional reporting obligations and oversight if we become subject to a corporate integrity agreement or other agreement to resolve allegations of non- compliance with these laws. Any action for violation of these laws, even if successfully defended, could cause us to incur significant legal expenses and divert management’s attention from the operation of the business. Prohibitions or restrictions on sales or withdrawal of future marketed products could materially affect business in an adverse way. Efforts to ensure that our business arrangements will comply with applicable healthcare laws may involve substantial costs.

Similar state, local, and foreign fraud and abuse laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or marketing arrangements and claims involving healthcare items or services. Such laws are generally broad and are enforced by various state agencies. Also, many states have similar fraud and abuse statutes or regulations that may be broader in scope and may apply regardless of payor, in addition to items and services reimbursed under Medicaid and other state programs. Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant federal government compliance guidance, and require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures. Several states also impose other marketing restrictions or require pharmaceutical companies to make marketing or price disclosures to the state and require the registration of pharmaceutical sales representatives. State and foreign laws, including for example the European Union General Data Protection Regulation, which became effective May 2018 also govern the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts. There are ambiguities as to what is required to comply with these state requirements and if we fail to comply with an applicable state law requirement we could be subject to penalties. Finally, there are state and foreign laws governing the privacy and security of health information, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.

State and federal authorities have aggressively targeted pharmaceutical companies for alleged violations of these anti-fraud statutes, based on improper research or consulting contracts with doctors, certain marketing arrangements with pharmacies and other healthcare providers that rely on volume-based pricing, off-label marketing schemes, and other improper promotional practices. Companies targeted in such prosecutions have paid substantial fines, have been ordered to implement extensive corrective action plans, and have in many cases become subject to consent decrees severely restricting the manner in which they conduct their business, among other consequences. Additionally, federal and state regulators have brought criminal actions against individual employees responsible for alleged violations. If we become the target of such an investigation or prosecution based on our contractual relationships with providers or institutions, or our marketing and promotional practices, we could face similar sanctions, which would materially harm our business.

Also, the Foreign Corrupt Practices Act and similar worldwide anti-bribery laws generally prohibit companies and their intermediaries from making improper payments to non-U.S. officials for the purpose of obtaining or retaining business. Our internal control policies and procedures may not protect us from reckless or negligent acts committed by our employees, future distributors, partners, collaborators or agents. Violations of these laws, or allegations of such violations, could result in fines, penalties or prosecution and have a negative impact on our business, results of operations and reputation.

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Even if we receive marketing approval, coverage and adequate reimbursement may not be available for our current or future product candidates, which could make it difficult for us to sell the product profitably.

Market acceptance and sales of our product candidates, if approved, will depend in part on the extent to which reimbursement for these products and related treatments will be available from third-party payors, including government health administration authorities, managed care organizations and other private health insurers. Obtaining coverage and adequate reimbursement approval for a product from a government or other third-party payor is a time-consuming and costly process that could require us to provide supporting scientific, clinical and cost effectiveness data for the use of our products to the payor.

Patients who are prescribed products for the treatment of their conditions generally rely on third-party payors to reimburse all or part of the costs associated with their prescription drugs. There is significant uncertainty related to third-party payor coverage and reimbursement of newly approved products. Third-party payors decide which therapies they will pay for and establish reimbursement levels. While no uniform policy for coverage and reimbursement exists in the United States, third-party payors often rely upon Medicare coverage policy and payment limitations in setting their own coverage and reimbursement policies. However, decisions regarding the extent of coverage and amount of reimbursement to be provided for any product candidate will be made on a payor-by-payor basis. Therefore, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage, and adequate reimbursement, for the product. Additionally, a third-party payor’s decision to provide coverage for a therapy does not imply that an adequate reimbursement rate will be approved.

Factors that payors consider when determining reimbursement are based on whether the product is:

•a covered benefit under its health plan;

•safe, effective and medically necessary;

•appropriate for the specific patient;

•cost-effective; and

•neither experimental nor investigational.

Each payor determines whether or not it will provide coverage for a therapy, what amount it will pay the manufacturer for the therapy and on what tier of its formulary it will be placed. The position on a payor’s list of covered drugs and biological products, or formulary, generally determines the co-payment that a patient will need to make to obtain the therapy and can strongly influence the adoption of such therapy by patients and physicians. Patients who are prescribed treatments for their conditions and providers prescribing such services generally rely on third-party payors to reimburse all or part of the associated healthcare costs. Patients are unlikely to use our products unless coverage is provided and reimbursement is adequate to cover a significant portion of the cost of our products. In addition, because our current product candidates and our other product candidates require the product to be physician-administered, separate reimbursement for the products themselves may or may not be available. Instead, the administering physician may only be reimbursed for providing the treatment or procedure in which our products are used.

There may be significant delays in obtaining such coverage and reimbursement for newly approved products, and coverage may be more limited than the purposes for which the product is approved by the FDA or comparable foreign regulatory authorities. In the United States, the principal decisions about reimbursement for new medicines are typically made by the Centers for Medicare & Medicaid Services, or CMS, an agency within the U.S. Department of Health and Human Services. CMS decides whether and to what extent a new medicine will be covered and reimbursed under Medicare and private payors tend to follow CMS to a substantial degree.

Moreover, eligibility for coverage and reimbursement does not imply that a product will be paid for in all cases or at a rate that covers our costs, including research, development, intellectual property, manufacture, sale and distribution expenses. Interim reimbursement levels for new products, if applicable, may also not be sufficient to cover our costs and may not be made permanent. Reimbursement rates may vary according to the use of the product and the clinical setting in which it is used, may be based on reimbursement levels already set for lower cost products and may be incorporated into existing payments for other services. Net prices for products may be reduced by mandatory discounts or rebates required by government healthcare programs or private payors, by any future laws limiting pharmaceutical prices and by any future relaxation of laws that presently restrict imports of product from countries where they may be sold at lower prices than in the United States. In addition, many pharmaceutical manufacturers must calculate and report certain price reporting metrics to the government, such as average sales price and best price. Penalties may apply in some cases when such metrics are not submitted accurately and timely.

Third-party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications. We cannot be sure that coverage and reimbursement will be available for any product that we commercialize and, if reimbursement is available, what the level of reimbursement will be. Inadequate coverage and reimbursement may impact the demand

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for, or the price of, any product for which we obtain marketing approval. If coverage and adequate reimbursement are not available, or are available only at limited levels, we may not be able to successfully commercialize any of our product candidates. Even if coverage is provided, the approved reimbursement amount may not be high enough to allow us to establish or maintain pricing sufficient to realize a sufficient return on our investment. Government authorities and third-party payors, such as private health insurers and health maintenance organizations, decide which medications they will pay for and establish reimbursement levels.

Outside the United States, international operations are generally subject to extensive governmental price controls and other market regulations, and we believe the increasing emphasis on cost containment initiatives in Europe, Canada and other countries has and will continue to put pressure on the pricing and usage of our product candidates. In many countries, the prices of medical products are subject to varying price control mechanisms as part of national health systems. Other countries allow companies to fix their own prices for medical products but monitor and control company profits. Additional foreign price controls or other changes in pricing regulation could restrict the amount that we are able to charge for our product candidates. Accordingly, in markets outside the United States, the reimbursement for our products may be reduced compared with the United States and may be insufficient to generate commercially reasonable revenue and profits.

Moreover, increasing efforts by governmental and third-party payors in Canada, the United States and other jurisdictions to cap or reduce healthcare costs may cause such organizations to limit both coverage and the level of reimbursement for newly approved products and, as a result, they may not cover or provide adequate payment for our product candidates. We expect to experience pricing pressures in connection with the sale of any of our product candidates due to the trend toward managed healthcare, the increasing influence of health maintenance organizations and additional legislative changes. The downward pressure on healthcare costs in general, particularly prescription drugs and surgical procedures and other treatments, has become very intense. As a result, increasingly high barriers are being erected to the entry of new products.

Legislative or regulatory healthcare reforms in the United States and other countries may make it more difficult and costly for us to obtain regulatory clearance or approval of our current or future product candidates and to produce, market and distribute our products after clearance or approval is obtained.

From time to time, legislation is drafted and introduced in the U.S. Congress or other countries that could significantly change the statutory provisions governing the regulatory clearance or approval, manufacture and marketing of regulated products or the reimbursement thereof. In addition, regulations and guidance are often revised or reinterpreted by the FDA and similar regulatory authorities in ways that may significantly affect our business and our products. Any new regulations or revisions or reinterpretations of existing regulations may impose additional costs or lengthen review times for our product candidates. Such changes could, among other things, require:

•changes to manufacturing or marketing methods;

•changes to product labeling or promotional materials;

•recall, replacement, or discontinuance of one or more of our products; and

•additional recordkeeping.

In the United States, there have been and continue to be a number of legislative initiatives and judicial challenges to contain healthcare costs. For example, in March 2010, the ACA was passed, which substantially changed the way healthcare is financed by both the government and private insurers and significantly impacts the U.S. pharmaceutical industry. The ACA, among other things, addresses a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs that are inhaled, infused, instilled, implanted or injected, increases the minimum Medicaid rebates owed by manufacturers under the Medicaid Drug Rebate Program and extends the rebate program to individuals enrolled in Medicaid managed care organizations, establishes annual fees and taxes on manufacturers of certain branded prescription drugs and creates a new Medicare Part D coverage gap discount program, in which manufacturers must now agree to offer 50% (increased to 70% pursuant to the Bipartisan Budget Act of 2018, effective as of 2019) point of sale discounts off negotiated prices of applicable brand drugs to eligible beneficiaries during their coverage gap period, as a condition for the manufacturer’s outpatient drugs to be covered under Medicare Part D, and provided incentives to programs that increase the federal government’s comparative effectiveness research.

Since its enactment, there have been numerous judicial, administrative, executive and legislative challenges to certain aspects of the ACA, and we expect there will be additional challenges and amendments to the ACA in the future. On June 17, 2021, the U.S. Supreme Court dismissed the most recent judicial challenge to the ACA brought by several states without specifically ruling on the constitutionality of the ACA. Prior to the Supreme Court’s decision, President Biden issued an executive order to initiate a special enrollment period from February 15, 2021 through August 15, 2021 for purposes of obtaining health insurance coverage through the ACA marketplace. The executive order also instructed certain governmental agencies to review and reconsider their existing policies

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and rules that limit access to healthcare, including among others, reexamining Medicaid demonstration projects and waiver programs that include work requirements, and policies that create unnecessary barriers to obtaining access to health insurance coverage through Medicaid or the ACA. It is unclear how other healthcare reform measures of the Biden administration or other efforts, if any, to challenge, repeal or replace the ACA will impact our business.

In addition, other legislative changes have been proposed and adopted since the ACA was enacted. These changes include aggregate reductions to Medicare payments to providers of 2% per fiscal year pursuant to the Budget Control Act of 2011, which began in 2013, and due to subsequent legislative amendments to the statute, including the Bipartisan Budget Act of 2018 will remain in effect through 2030 unless additional U.S. Congressional action is taken. The American Taxpayer Relief Act of 2012, among other things, further reduced Medicare payments to several providers, including hospitals and cancer treatment centers, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Due to the Statutory Pay-As-You-Go Act of 2010, estimated budget deficit increases resulting from the American Rescue Plan Act of 2021, and subsequent legislation, Medicare payments to providers will be further reduced starting in 2025 absent further legislation. These laws and regulations may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used. These new laws and regulations may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used.

There has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices. Specifically, there have been several recent U.S. Congressional inquiries and proposed federal and state legislation designed to, among other things, bring more transparency to drug pricing, reduce the cost of prescription drugs under Medicare, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drugs. President Biden has issued multiple executive orders that have sought to reduce prescription drug costs. In addition, in February 2023, HHS issued a proposal in response to an October 2022 executive order from President Biden that includes a proposed prescription drug pricing model that will test whether targeted Medicare payment adjustments will sufficiently incentivize manufacturers to complete confirmatory trials for drugs approved through FDA’s accelerated approval pathway. Although a number of these and other proposed measures may require authorization through additional legislation to become effective, and the Biden administration may reverse or otherwise change these measures, both the Biden administration and Congress have indicated that they will continue to seek new legislative measures to control drug costs.

In addition, there have been several changes to the 340B drug pricing program, which imposes ceilings on prices that certain drug and biologic manufacturers can charge for medications sold to certain health care facilities. It is unclear how these developments could affect covered hospitals who might purchase our future products and affect the rates we may charge such facilities for our approved products in the future, if any. On July 24, 2020 and September 13, 2020, former President Trump announced several executive orders related to prescription drug pricing that seek to implement several of the former administration's proposals. In response, the FDA released a final rule on September 24, 2020, which went into effect on November 30, 2020, providing guidance for states to build and submit importation plans for drugs from Canada. However, on December 29, 2021 CMS rescinded the Most Favored Nations rule. Additionally, on November 30, 2020, HHS published a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The rule also creates a new safe harbor for price reductions reflected at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit managers and manufacturers. Pursuant to court order, the removal and addition of the aforementioned safe harbors were delayed and recent legislation imposed a moratorium on implementation of the rule until January 1, 2026. The IRA further delayed implementation of this rule to January 1, 2032. Although a number of these, and other proposed measures may require authorization through additional legislation to become effective, and the Biden administration may reverse or otherwise change these measures, Congress has indicated that it will continue to seek new legislative and/or administrative measures to control drug costs. At the state level, legislatures have increasingly passed legislation and implemented regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

Further, on May 30, 2018, the Right to Try Act, was signed into law into the U.S. The law, among other things, provides a federal framework for certain patients to access certain investigational new drug products that have completed a Phase 1 clinical trial and that are undergoing investigation for FDA approval. Under certain circumstances, eligible patients can seek treatment without enrolling in clinical trials and without obtaining FDA permission under the FDA expanded access program. There is no obligation for a pharmaceutical manufacturer to make its drug products available to eligible patients as a result of the Right to Try Act.

In addition, on July 9, 2021, President Biden issued an executive order directing the FDA to, among other things, work with states and tribes to safely import prescription drugs from Canada and to continue to clarify and improve the approval framework for generic

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drugs and biosimilars, including the standards for interchangeability of biological products, facilitate the development and approval of biosimilar and interchangeable products, clarify existing requirements and procedures related to the review and submission of BLAs, and identify and address any efforts to impede generic drug and biosimilar competition.

IRA includes several provisions that may impact our business to varying degrees, including provisions that reduce the out-of-pocket spending cap for Medicare Part D beneficiaries from $7,050 to $2,000 starting in 2025, thereby effectively eliminating the coverage gap; impose new manufacturer financial liability on certain drugs under Medicare Part D, allow the U.S. government to negotiate Medicare Part B and Part D price caps for certain high-cost drugs and biologics without generic or biosimilar competition; require companies to pay rebates to Medicare for certain drug prices that increase faster than inflation; and delay until January 1, 2032 the implementation of the HSS rebate rule that would have limited the fees that pharmacy benefit managers can charge. Further, under the IRA, orphan drugs are exempted from the Medicare drug price negotiation program, but only if they have one rare disease designation and for which the only approved indication is for that disease or condition. If a product receives multiple rare disease designations or has multiple approved indications, it may not qualify for the orphan drug exemption. The effects of the IRA on our business and the healthcare industry in general is not yet known.

We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance companies, managed care organizations and other payors of healthcare services to contain or reduce costs of healthcare and/or impose price controls may adversely affect:

•the demand for our product candidates, if we obtain regulatory approval;

•our ability to set a price that we believe is fair for our approved products;

•our ability to generate revenue and achieve or maintain profitability;

•the level of taxes that we are required to pay; and

•the availability of capital.

Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors, which may adversely affect our future profitability.

Further, on December 31, 2020, CMS published a new rule, effective January 1, 2023, requiring manufacturers to ensure the full value of co-pay assistance is passed on to the patient or these dollars will count toward the Average Manufacturer Price and Best Price calculation of the drug. On May 17, 2022, the U.S. District Court for the District of Columbia granted the Pharmaceutical Research and Manufacturers of America's (PhRMA) motion for summary judgment invalidating the accumulator adjustment rule.

We expect that these and other healthcare reform measures that may be adopted in the future, any of which could limit the amounts that the U.S. Federal Government will pay for healthcare drugs and services, which could result in reduced demand for our drug candidates or additional pricing pressures.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels in the U.S. directed at broadening the availability of healthcare and containing or lowering the cost of healthcare. Individual U.S. states have become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain drug access and marketing cost disclosure and transparency measures, and designed to encourage importation from other countries and bulk purchasing. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability or commercialize our products. Such reforms could have an adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain regulatory approval and may affect our overall financial condition and ability to develop product candidates. If we or any third parties we may engage are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we or such third parties are not able to maintain regulatory compliance, our current or any future product candidates we may develop may lose any regulatory approval that may have been obtained and we may not achieve or sustain profitability.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could have a material adverse effect on the success of our business.

We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory procedures and the handling, use, storage, treatment and disposal of hazardous materials and wastes. Our operations involve the use of hazardous and flammable materials, including chemicals and biological and radioactive materials. Our operations also produce hazardous waste products. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous

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materials, we could be held liable for any resulting damages, and any liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties.

Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive materials.

Risks Related to Our Intellectual Property

If we are unable to obtain and maintain patent protection for any products we develop and for our technology, or if the scope of the patent protection obtained is not sufficiently broad, our competitors could develop and commercialize products and technology similar or identical to ours, and our ability to commercialize any product candidates we may develop, and our technology may be adversely affected.

Our success depends in large part on our ability to obtain and maintain patent protection in the United States and other countries with respect to our product candidates, their respective components, formulations, combination therapies, methods used to manufacture them and methods of treatment and development that are important to our business. If we do not adequately protect our intellectual property rights, competitors may be able to erode or negate any competitive advantage we may have, which could harm our business and ability to achieve profitability. To protect our proprietary position, we file patent applications in the United States and abroad related to our novel product candidates that are important to our business; we may in the future also license or purchase patent applications filed by others. If we are unable to secure or maintain patent protection with respect to our Fast-Clear linker technology and any proprietary products and technology we develop, our business, financial condition, results of operations, and prospects could be materially harmed.

If the scope of the patent protection we or our potential licensors obtain is not sufficiently broad, we may not be able to prevent others from developing and commercializing technology and products similar or identical to ours. The degree of patent protection we require to successfully compete in the marketplace may be unavailable or severely limited in some cases and may not adequately protect our rights or permit us to gain or keep any competitive advantage. We cannot provide any assurances that any of our patents have, or that any of our pending patent applications that mature into issued patents will include, claims with a scope sufficient to protect our current and future product candidates or otherwise provide any competitive advantage. In addition, to the extent that we license intellectual property in the future, we cannot assure you that those licenses will remain in force. In addition, the laws of foreign countries may not protect our rights to the same extent as the laws of the United States. Furthermore, patents have a limited lifespan. In the United States, the natural expiration of a patent is generally 20 years after it is filed (21 years if first filed as a provisional application). Various extensions may be available; however, the life of a patent, and the protection it affords, is limited. Given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized.

Even if they are unchallenged, our patents and pending patent applications, if issued, may not provide us with any meaningful protection or prevent competitors from designing around our patent claims to circumvent our patents by developing similar or alternative technologies or therapeutics in a non-infringing manner. For example, a third party may develop a competitive therapy that provides benefits similar to one or more of our product candidates but that uses a formulation and/or a device that falls outside the scope of our patent protection. If the patent protection provided by the patents and patent applications we hold or pursue with respect to our product candidates is not sufficiently broad to impede such competition, our ability to successfully commercialize our product candidates could be negatively affected, which would harm our business. We currently own or have exclusively in-licensed all of our patents or patent applications. Similar risks would apply to any patents or patent applications that we may own and those which we may license in the future. In many cases, in-licensed intellectual property is at greater risk, as we may not have access to all information or to prosecution and other aspects of the acquisition, maintenance and enforcement of the in-licensed intellectual property.

Patent positions of life sciences companies can be uncertain and involve complex factual and legal questions. No consistent policy governing the scope of claims allowable in the fields of antibodies and radiopharmaceuticals has emerged in the United States. The scope of patent protection in jurisdictions outside of the United States is also uncertain. Changes in either the patent laws or their interpretation in any jurisdiction that we seek patent protection may diminish our ability to protect our inventions, maintain and enforce our intellectual property rights; and, more generally, may affect the value of our intellectual property, including the narrowing of the scope of our patents and any that we may license.

The patent prosecution process is complex, expensive, time-consuming and inconsistent across jurisdictions. We may not be able to file, prosecute, maintain, enforce, or license all necessary or desirable patent rights at a commercially reasonable cost or in a timely manner. In addition, we may not pursue or obtain patent protection in all relevant markets. It is possible that we will fail to identify important patentable aspects of our research and development efforts in time to obtain appropriate or any patent protection. While we

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enter into non-disclosure and confidentiality agreements with parties who have access to confidential or patentable aspects of our research and development efforts, including for example, our employees, corporate collaborators, external academic scientific collaborators, CROs, contract manufacturers, consultants, advisors and other third parties, any of these parties may breach the agreements and disclose such output before a patent application is filed, thereby endangering our ability to seek patent protection. In addition, publications of discoveries in the scientific and scholarly literature often lag behind the actual discoveries, and patent applications in the United States and other jurisdictions are typically not published until 18 months after filing, or in some cases not until issuance as a patent. Consequently, we cannot be certain that we were the first to file for patent protection on the inventions claimed in our patents or pending patent applications.

The issuance, scope, validity, enforceability and commercial value of our patent rights are highly uncertain. Further, the scope of the invention claimed in a patent application can be significantly reduced before the patent is issued, and this scope can be reinterpreted after issuance. Even where patent applications we currently own, license, or that we may license in the future issue as patents, they may not issue in a form that will provide us with adequate protection to prevent competitors or other third parties from competing with us, or otherwise provide us with a competitive advantage. Any patents that eventually issue may be challenged, narrowed or invalidated by third parties. Consequently, we do not know whether any of our product candidates will be protectable or remain protected by valid and enforceable patent rights. Our competitors or other third parties may be able to evade our patent rights by developing new antibodies, biosimilar antibodies, or alternative technologies or products in a non-infringing manner.

The issuance or grant of a patent is not irrefutable as to its inventorship, scope, validity or enforceability, and our patents may be challenged in the courts or patent offices in the United States and abroad. There may be prior art of which we are not aware that may affect the validity or enforceability of a patent claim. There also may be prior art of which we are aware, but which we do not believe affects the validity or enforceability of a claim, which may, nonetheless, ultimately be found to affect the validity or enforceability of a claim. We may in the future, become subject to a third-party pre-issuance submission of prior art or opposition, derivation, revocation, re-examination, post-grant and inter partes review, or interference proceeding and other similar proceedings challenging our patent rights or the patent rights of others in the U.S. Patent and Trademark Office, or the USPTO, or other foreign patent office. An unfavorable determination in any such submission, proceeding or litigation could reduce the scope of, or invalidate, our patent rights, allow third parties to commercialize our technology or products and compete directly with us, without payment to us, or extinguish our ability to manufacture or commercialize products without infringing third-party patent rights.

In addition, given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized. As a result, our intellectual property may not provide us with sufficient rights to exclude others from commercializing products similar or identical to ours. Moreover, some of our owned and in-licensed patents and patent applications are, and may in the future be, co-owned with third parties. If we are unable to obtain an exclusive license to any such third-party co-owners’ interest in such patents or patent applications, such co-owners may be able to license their rights to other third parties, including our competitors, and our competitors could market competing products and technology. In addition, we or our licensors may need the cooperation of any such co-owners of our owned and in-licensed patents in order to enforce such patents against third parties, and such cooperation may not be provided to us or our licensors. Any of the foregoing could have a material adverse effect on our competitive position, business, financial conditions, results of operations and prospects.

We depend on intellectual property licensed from third parties and termination of any of these licenses could result in the loss of significant rights, which would harm our business.

We are dependent on patents, know-how and proprietary technology, both our own and licensed from others. In December 2016, we entered into the ImmunoGen License Agreement with ImmunoGen, Inc., or ImmunoGen, pursuant to which we acquired a worldwide, exclusive, sublicensable royalty-bearing license to use, develop, manufacture and commercialize, and otherwise exploit any radiopharmaceutical conjugate that includes or incorporates ImmunoGen’s monoclonal antibody to IGF-1R and the related amino acid sequence, and any antibody derived therefrom, including the naked antibody we utilize in FPI-1434 for the treatment, prevention, diagnosis, control and maintenance of all diseases and disorders. In February 2017, we entered into the CPDC License Agreement with CPDC, pursuant to which we acquired a worldwide, exclusive license to (i) all of CPDC’s patents and patent applications throughout the world covering or relating to the technology owned or licensable by CPDC relating to its IGF-1R program and the associated novel linker technology and (ii) all of CPDC’s technical information related to such technology, including the right to sublicense any or all such rights to such technology. On April 1, 2021, we acquired Ipsen’s intellectual property and assets related to IPN-1087 and were granted a license to certain related intellectual property from 3B Pharmaceuticals GmbH.

These agreements impose numerous obligations, such as diligence and payment obligations. Any termination of these licenses could result in the loss of significant rights and could harm our ability to commercialize our product candidates. These licenses do and future licenses may include provisions that impose obligations and restrictions on us. This could delay or otherwise negatively impact a transaction that we may wish to enter into.

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Disputes may also arise between us and our licensors regarding intellectual property subject to a license agreement, including disputes concerning:

•the scope of rights granted under the license agreement and other interpretation-related issues;

•whether and the extent to which our technology and processes infringe on intellectual property of the licensor that is not subject to the licensing agreement;

•our right to sublicense patent and other rights to third parties under collaborative development relationships;

•our diligence obligations with respect to the use of the licensed technology in relation to our development and commercialization of our product candidates, and what activities satisfy those diligence obligations; and

•the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our partners.

If disputes over intellectual property that we have licensed prevent or impair our ability to maintain our current licensing arrangements on acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

We are generally also subject to all of the same risks with respect to protection of intellectual property that we license, as we are for intellectual property that we own, which are described below. If we or our licensors fail to adequately protect this intellectual property, our ability to commercialize products could suffer.

If we fail to comply with our obligations under our patent licenses with third parties, we could lose license rights that are important to our business.

We are a party to license agreements with third parties pursuant to which we in-license key patent and patent applications for use in one or more of our product candidates. These existing licenses impose various diligence, milestone payment, royalty, insurance and other obligations on us. If we fail to comply with these obligations, the licensors may have the right to terminate the licenses, in which event we would not be able to develop or market the products covered by such licensed intellectual property.

We rely on certain of our licensors to file and prosecute patent applications and maintain patents and otherwise protect the intellectual property we license from them and may continue to do so in the future. We have limited control over these activities or any other intellectual property that may be related to our in-licensed intellectual property. For example, we cannot be certain that such activities by these licensors have been or will be conducted in compliance with applicable laws and regulations or will result in valid and enforceable patents and other intellectual property rights. We have limited control over the manner in which our licensors initiate an infringement proceeding against a third-party infringer of the intellectual property rights, or defend certain of the intellectual property that is licensed to us. It is possible that any licensors’ infringement proceeding or defense activities may be less vigorous than had we conducted them ourselves.

Our proprietary position depends upon patents that are manufacturing, formulation or method-of-use patents, which may not prevent a competitor or other third party from using the same product candidate for another use.

Composition-of-matter patents on the active pharmaceutical ingredient, or API, in prescription drug products are generally considered to be the strongest form of intellectual property protection for drug products because such patents provide protection without regard to any particular method of use or manufacture or formulation of the API used. We currently have claims in an in-licensed issued U.S. patent that cover the antibody composition of matter incorporated in some of our product candidates. We license at least one issued U.S. patent with claims that cover the FPI-1434 product candidate. We are pursuing claims in our owned and in-licensed pending patent applications to provide additional compositions of matter coverage, including coverage of our product candidates. We cannot be certain that claims in any future patents issuing from our pending owned or in-licensed patent applications or our future owned or in-licensed patent applications will cover the composition of matter of our current or future product candidates.

However, we do not own or in-license any composition of matter patents or patent applications in the United States or any other jurisdiction with respect to our FPI-2265 product candidate. Further, we do not currently own or in-license any U.S. or foreign patents or patent applications covering the method of use of our FPI-2265 product candidate. We do own a U.S. provisional patent application with claims directed to formulations related to our FPI-2265 product candidate and we intend to file additional patent applications in the future that cover our FPI-2265 product candidate, but we cannot be certain that our future owned or licensed patent applications will cover our FPI-2265 product candidate. As a result, our owned patent portfolio and any patent portfolio we may license in the future may not provide us with adequate and continuing patent protection sufficient to exclude others from commercializing products similar or identical to our FPI-2265 product candidate.

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Method-of-use patents protect the use of a product for the specified method and formulation patents cover formulations of the active pharmaceutical ingredient, or API. These types of patents do not prevent a competitor or other third party from developing or marketing an identical product for an indication that is outside the scope of the patented method or from developing a different formulation that is outside the scope of the patented formulation. Moreover, with respect to method-of-use patents, even if competitors or other third parties do not actively promote their product for our targeted indications or uses for which we may obtain patents, physicians may recommend that patients use these products off-label, or patients may do so themselves. Although off-label use may infringe or contribute to the infringement of method-of-use patents, the practice is common, and this type of infringement is difficult to prevent or prosecute. In addition, there are numerous publications and other prior art that may be relevant to our owned or in-licensed method-of-use patents and patent applications and may be used to challenge the validity of these owned or in-licensed patents and patent applications in litigation or other intellectual property-related proceedings. If these types of challenges are successful, our owned or in-licensed patents and patent applications may be narrowed or found to be invalid and we may lose valuable intellectual property rights. Any of the foregoing could have a material adverse effect on our business, financial conditions, prospects and results of operations.

If our efforts to protect the proprietary nature of the intellectual property related to our technologies are not adequate, we may not be able to compete effectively in our market.

We rely upon a combination of patents, confidentiality agreements, trade secret protection and license agreements to protect the intellectual property related to our technologies. Any disclosure to or misappropriation by third parties of our confidential proprietary information could enable competitors to quickly duplicate or surpass our technological achievements, thus eroding our competitive position in our market. We, or any future partners, collaborators, licensors or licensees, may fail to identify patentable aspects of inventions made in the course of development and commercialization activities before it is too late to obtain patent protection on them. Therefore, we may miss potential opportunities to strengthen our patent position.

It is possible that defects of form in the preparation or filing of our patents or patent applications may exist, or may arise in the future, for example with respect to proper priority claims, inventorship, claim scope, or requests for patent term adjustments. If we or our partners, collaborators, licensees or licensors fail to establish, maintain or protect such patents and other intellectual property rights, such rights may be reduced or eliminated. If our partners, collaborators, licensees or licensors are not fully cooperative or disagree with us as to the prosecution, maintenance or enforcement of any patent rights, such patent rights could be compromised. If there are material defects in the form, preparation, prosecution, or enforcement of our patents or patent applications, such patents may be invalid and/or unenforceable, and such applications may never result in valid, enforceable patents. Any of these outcomes could impair our ability to prevent competition from third parties, which may have an adverse impact on our business.

We anticipate additional patent applications will be filed both in the United States and in other countries, as appropriate. However, we cannot predict:

•if additional patent applications covering new technologies related to our product candidates will be filed;

•if and when patents will issue;

•the degree and range of protection any issued patents will afford us against competitors, including whether third parties will find ways to invalidate or otherwise circumvent our patents;

•whether any of our intellectual property will provide any competitive advantage;

•whether any of our patents that may be issued may be challenged, invalidated, modified, revoked, circumvented, found to be unenforceable or otherwise may not provide any competitive advantage;

•whether or not others will obtain patents claiming aspects similar to those covered by our patents and patent applications; or

•whether we will need to initiate or defend litigation or administrative proceedings which may be costly regardless of whether we win or lose.

Additionally, we cannot be certain that the claims in our pending patent applications covering composition of matter of our product candidates will be considered patentable by the USPTO, or by patent offices in foreign countries, or that the claims in any of our issued patents will be considered valid or patentable by courts in the United States or foreign countries.

Method of use patents protect the use of a product for the specified method. These types of patents do not prevent a competitor from making and marketing a product that is identical to our product for an indication that is outside the scope of the patented method. Moreover, even if competitors do not actively promote their product for our targeted indications, physicians may prescribe these products “off-label.” Although off-label prescriptions may, but not necessarily, contribute to a finding of infringement of method of use patents, the practice is common and such infringement is difficult to prevent or prosecute.

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The strength of patents in the biotechnology and pharmaceutical field involves complex legal and scientific questions and can be uncertain. The patent applications that we own or in-license may fail to result in issued patents with claims that cover our product candidates or uses thereof in the United States or in foreign countries. Even if the patents do successfully issue, third parties may challenge the validity, enforceability or scope thereof, which may result in such patents being narrowed, invalidated or held unenforceable. Furthermore, even if they are unchallenged, our patents and patent applications may not adequately protect our intellectual property or prevent others from designing around our claims. If the breadth or strength of protection provided by the patents or patent applications we hold with respect to our product candidates is threatened, it could dissuade companies from collaborating with us to develop, and threaten our ability to commercialize, our product candidates.

Further, if we encounter delays in our clinical trials, the period of time during which we could market our product candidates under patent protection would be reduced. Since patent applications in the United States and most other countries are confidential for a period of time after filing, we cannot be certain that we were the first to file any patent application related to our product candidates if we file such applications in the future. Furthermore, for U.S. applications in which all claims are entitled to a priority date before March 16, 2013, an interference proceeding can be provoked by a third-party or instituted by the USPTO to determine who was the first to invent any of the subject matter covered by the patent claims. We cannot be certain that we are the first to invent the inventions covered by pending patent applications and, if we are not, we may be subject to priority disputes. We may be required to disclaim part or all of the term of certain patents or all of the term of certain patent applications. Various post grant review proceedings, such as inter partes review and post grant review, are available for any interested third party to challenge the validity of claims in our issued patents. While these post grant review proceedings have been used less frequently to invalidate biotech patents, there has been a higher number of successful challenges in other technology areas. Post grant review is a relatively new procedure in the U.S. and some other jurisdictions. These procedures and even long-standing procedures in foreign jurisdictions or in any jurisdiction where they exist might affect future results. No assurance can be given that, if challenged, our patents would be declared by a court to be valid or enforceable or that even if found valid and enforceable, that a competitor’s technology or product would be found by a court to infringe our patents. We may analyze patents or patent applications of our competitors that we believe are relevant to our activities, and consider that we are free to operate in relation to our product candidates, but our competitors may obtain issued claims, including in patents we consider to be unrelated to our products or activities, which block our efforts or may potentially result in our product candidates or our activities infringing such claims. The possibility exists that others will develop products which have the same effect as our products on an independent basis which do not infringe our patents or other intellectual property rights, or will design around the claims of patents that we have had issued that cover our products.

Recent or future patent reform legislation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents. In March 2013, under the Leahy-Smith America Invents Act, or America Invents Act, or AIA, the United States moved from a “first to invent” to a “first-to-file” system. Under a “first-to-file” system, assuming the other requirements for patentability are met, the first applicant to file a patent application generally will be entitled to a patent on the invention regardless of whether another applicant made the invention earlier. The AIA includes a number of other significant changes to U.S. patent law, including provisions that affect the way patent applications are prosecuted, redefine what is relevant prior art and establish a new post-grant review system. The effects of these changes are currently unclear as the USPTO developed new regulations and procedures in connection with the AIA and many of the substantive changes to patent law, including the “first-to-file” provisions, first became effective in March 2013. These regulations and procedures remain subject to change. In addition, the courts have yet to address many of the provisions of the AIA and the applicability of the AIA and resulting regulations. The impact of the AIA on the scope, validity or enforceability of on specific patents discussed herein have not been determined and would need to be reviewed. The AIA implementation may increase uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents, all of which could have a material adverse effect on our business and financial condition.

If we are unable to protect the confidentiality of our trade secrets, our business and competitive position would be harmed.

In addition to the protection afforded by patents, we seek to rely on trade secret protection, confidentiality agreements, and license agreements to protect proprietary know-how that is not patentable, processes for which patents are difficult to enforce and any other elements of our product discovery and development processes that involve proprietary know-how, information, or technology that is not covered by our patents. Although we require all of our employees to assign their inventions to us, and require all of our employees, consultants, advisors and any third parties who have access to our proprietary know-how, information, or technology to enter into confidentiality agreements, we cannot be certain that our trade secrets and other confidential proprietary information will not be disclosed to our competitors or that competitors will not otherwise gain access to our trade secrets or independently develop substantially equivalent information and techniques. Furthermore, the laws of some foreign countries do not protect proprietary rights to the same extent or in the same manner as the laws within the United States. As a result, we may encounter significant problems in protecting and defending our intellectual property both in the United States and abroad. If we are unable to prevent unauthorized material disclosure of our intellectual property to third parties, we will not be able to establish or maintain a competitive advantage in our market, which could materially adversely affect our business, operating results and financial condition.

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Courts outside the United States are sometimes less willing to protect trade secrets. If we choose to go to court to stop a third party from using any of our trade secrets, we may incur substantial costs. These lawsuits may consume our time and other resources even if we are successful. For example, significant elements of our products, including confidential aspects of sample preparation, methods of manufacturing, cell culturing conditions, computational-biological algorithms, and related processes and software, are based on unpatented trade secrets. Although we take steps to protect our proprietary information and trade secrets, including through contractual means with our employees and consultants, third parties may independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our trade secrets or disclose our technology.

We may not be able to meaningfully protect our trade secrets. It is our policy to require our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors to execute confidentiality agreements upon the commencement of employment or consulting relationships with us. These agreements provide that all confidential information concerning our business or financial affairs developed or made known to the individual or entity during the course of the party’s relationship with us is to be kept confidential and not disclosed to third parties except in specific circumstances. In the case of employees, the agreements provide that all inventions conceived by the individual, and which are related to our current or planned business or research and development or made during normal working hours, on our premises or using our equipment or proprietary information, are our exclusive property. In addition, we take other appropriate precautions, such as physical and technological security measures, to guard against misappropriation of our proprietary technology by third parties. We have also adopted policies and conduct training that provides guidance on our expectations, and our advice for best practices, in protecting our trade secrets. Despite these undertakings, we may not be able to effectively protect our trade secrets.

Third-party claims of intellectual property infringement may prevent or delay our product discovery and development efforts.

Our commercial success depends in part on our avoiding infringement of the patents and proprietary rights of third parties. There is a substantial amount of litigation involving the infringement of patents and other intellectual property rights in the biotechnology and pharmaceutical industries. We may be exposed to, or threatened with, future litigation by third parties having patent or other intellectual property rights and who allege that our product candidates, uses and/or other proprietary technologies infringe their intellectual property rights. We are aware of certain third party patent rights that some may argue cover our FPI-2265, our PSMA I&T product candidate or its use. We have filed an Inter Partes Review, or IPR, petition with the USPTO to challenge the validity of a certain issued U.S. Patent. In the event that we are unsuccessful in the IPR and that such patent has not expired at the time of approval of FPI-2265, our PSMA I&T product candidate and the patent owners were to bring an infringement action against us, we may have to argue that FPI-2265, our PSMA I&T product candidate, its manufacture or use does not infringe a valid claim of the patent in question. Furthermore, if we were to challenge the validity of this or any other issued U.S. patent in court, we would need to overcome a statutory presumption of validity that attaches to every U.S. patent. This means that in order to prevail, we would need to present clear and convincing evidence as to the invalidity of the patent’s claims. There is no assurance that a court would find in our favor on questions of infringement or validity. In the event that a patent is successfully asserted against us such that the patent is found to be valid and enforceable and infringed by FPI-2265, our PSMA I&T product candidate or its use, unless we obtain a license to such a patent, which may not be available on commercially reasonable terms or at all, we could be prevented from continuing to develop or commercialize our product.

Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we are developing our product candidates. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk that our product candidates may give rise to claims of infringement of the patent rights of others increases. Moreover, it is not always clear to industry participants, including us, which patents exist which may be found to cover various types of drugs, products or their methods of use or manufacture. Thus, because of the large number of patents issued and patent applications currently pending in our fields, there may be a risk that third parties may allege they have patent rights which are infringed by our product candidates, technologies or methods.

If a third party alleges that we infringe its intellectual property rights, we may face a number of issues, including, but not limited to:

•infringement and other intellectual property misappropriation which, regardless of merit, may be expensive and time-consuming to litigate and may divert our management’s attention from our core business;

•substantial damages for infringement or misappropriation, which we may have to pay if a court decides that the product candidate or technology at issue infringes on or violates the third-party’s rights, and, if the court finds we have willfully infringed intellectual property rights, we could be ordered to pay treble damages and the patent owner’s attorneys’ fees;

•an injunction prohibiting us from manufacturing, marketing or selling our product candidates, or from using our proprietary technologies, unless the third party agrees to license its patent rights to us;

•even if a license is available from a third party, we may have to pay substantial royalties, upfront fees and other amounts, and/or grant cross-licenses to intellectual property rights protecting our products; and

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•we may be forced to try to redesign our product candidates or processes so they do not infringe third-party intellectual property rights, an undertaking which may not be possible or which may require substantial monetary expenditures and time.

Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially greater resources. In addition, any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to raise the funds necessary to continue our operations or could otherwise have a material adverse effect on our business, results of operations, financial condition and prospects.

Third parties may assert that we are employing their proprietary technology without authorization. Generally, conducting preclinical and clinical trials and other development activities in the United States is not considered an act of infringement. If FPI-2265, FPI-1434, FPI-2059, FPI-2068 or another product candidate is approved by the FDA, a third party may then seek to enforce its patent by filing a patent infringement lawsuit against us. While we may believe that patent claims or other intellectual property rights of a third party would not have a materially adverse effect on the commercialization of our product candidates, we may be incorrect in this belief, or we may not be able to prove it in litigation. In this regard, patents issued in the United States by law enjoy a presumption of validity that can be rebutted only with evidence that is “clear and convincing,” a heightened standard of proof. There may be issued third-party patents of which we are currently unaware with claims to compositions, formulations, methods of manufacture or methods for treatment related to the use or manufacture of our product candidates. Patent applications can take many years to issue. There may be currently pending patent applications which may later result in issued patents that may be infringed by our product candidates. Moreover, we may fail to identify relevant patents or incorrectly conclude that a patent is invalid, not enforceable, exhausted, or not infringed by our activities. If any third-party patents, held now or obtained in the future by a third party, were found by a court of competent jurisdiction to cover the manufacturing process of our product candidates, constructs or molecules used in or formed during the manufacturing process, or any final product or methods use of the product, the holders of any such patents may be able to block our ability to commercialize the product candidate unless we obtained a license under the applicable patents, or until such patents expire or they are finally determined to be held invalid or unenforceable. Similarly, if any third-party patent were held by a court of competent jurisdiction to cover any aspect of our formulations, any combination therapies or patient selection methods, the holders of any such patent may be able to block our ability to develop and commercialize the product candidate unless we obtained a license or until such patent expires or is finally determined to be held invalid or unenforceable. In either case, such a license may not be available on commercially reasonable terms or at all. If we are unable to obtain a necessary license to a third-party patent on commercially reasonable terms, or at all, our ability to commercialize our product candidates may be impaired or delayed, which could in turn significantly harm our business. Even if we obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. In addition, if the breadth or strength of protection provided by our patents and patent applications is threatened, it could dissuade companies from collaborating with us to license, develop or commercialize current or future product candidates.

Parties making claims against us may seek and obtain injunctive or other equitable relief, which could effectively block our ability to further develop and commercialize our product candidates. Defense of these claims, regardless of their merit, could involve substantial litigation expense and would be a substantial diversion of employee resources from our business. In the event of a successful claim of infringement against us, we may have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, obtain one or more licenses from third parties, pay royalties or redesign our infringing products, which may be impossible or require substantial time and monetary expenditure. We cannot predict whether any such license would be available at all or whether it would be available on commercially reasonable terms. Furthermore, even in the absence of litigation, we may need or may choose to obtain licenses from third parties to advance our research or allow commercialization of our product candidates. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In that event, we would be unable to further develop and commercialize our product candidates, which could harm our business significantly.

We may not be successful in obtaining or maintaining necessary rights to product components and processes for our development pipeline through acquisitions and in-licenses.

Presently we have rights to certain patents and applications through licenses from third parties and own patents and patent applications related to our product candidates. Because additional product candidates or therapies, including combination therapies with our product candidates may require the use of proprietary rights held by third parties, the growth of our business will likely depend in part on our ability to acquire, in-license or use these proprietary rights.

Our product candidates may also require specific formulations to work effectively and efficiently and rights to the formulations may be held by others. Similarly, efficient production or delivery of our product candidates may also require specific compositions or methods, and the rights to these may be owned by third parties. We may be unable to acquire or in-license compositions, methods of use, processes or other intellectual property rights from third parties that we identify as necessary or important to our business operations. If we fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all, it would harm our business. We may need to cease use of the compositions or methods covered by such third-party intellectual property rights, and/or may need to seek to develop

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alternative approaches that do not infringe on such intellectual property rights which may entail additional costs and development delays, even if it is possible and we were able to develop such alternatives. Even if we are able to obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies that we have licensed. In that event, we may be required to expend significant time and resources to develop or license replacement technologies. Moreover, the specific targeting vectors that will be used with our product candidates may be covered by the intellectual property rights of others.

Additionally, we have and may continue to collaborate with academic institutions to accelerate our preclinical research or development under written agreements with these institutions. In certain cases, these institutions provide us with an option to negotiate a license to any of the institution’s rights in technology resulting from the collaboration. Regardless of such option, we may be unable to negotiate a license within the specified timeframe or under terms that are acceptable to us. If we are unable to do so, the institution may offer the intellectual property rights to others, potentially blocking our ability to pursue our program. If we are unable to successfully obtain rights to required third-party intellectual property or to maintain the existing intellectual property rights we have, we may have to abandon development of such program and our business and financial condition could suffer.

The licensing and acquisition of third-party intellectual property rights is a competitive area, and companies, which may be more established, or have greater resources than we do, may also be pursuing strategies to license or acquire third-party intellectual property rights that we may consider necessary or attractive in order to commercialize our product candidates. More established companies may have a competitive advantage over us due to their size, cash resources and greater clinical development and commercialization capabilities.

We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time-consuming and unsuccessful.

Competitors may infringe our patents or the patents of our licensors. To counter infringement or unauthorized use, we may be required to take legal action to enforce our patents or our licensors’ patents against such infringing activity. Such enforcement proceedings against infringers can be expensive and time-consuming.

In addition, in an infringement proceeding, a court may decide that one or more of our patents is not valid or is unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the compositions or activities in question. An adverse result in any litigation or defense proceedings could put one or more of our patents at risk of being invalidated, held unenforceable, or interpreted narrowly and could put our patent applications at risk of not issuing. Defense against these assertions, non-infringement, invalidity or unenforceability regardless of their merit, would involve substantial litigation expense and would be a substantial diversion of employee resources from our business. In the event of a successful claim of infringement against us, we may have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, obtain one or more licenses from third parties, pay royalties or redesign our infringing products, which may be impossible or require substantial time and monetary expenditure.

Post-grant proceedings provoked by third parties or brought by the USPTO may be brought to determine the validity or priority of inventions with respect to our patents or patent applications or those of our licensors. An unfavorable outcome could result in a loss of our current patent rights and could require us to cease using the related technology or to attempt to license rights to it from the prevailing party. Our business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms. Litigation or post-grant proceedings may result in a decision adverse to our interests and, even if we are successful, may result in substantial costs and distract our management and other employees. We may not be able to prevent, alone or with our licensors, misappropriation of our trade secrets or confidential information, particularly in countries where the laws may not protect those rights as fully as those within the United States.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common shares.

Obtaining and maintaining our patent protection depends on compliance with various procedural, document submission, fee payment and other requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these requirements.

Some of our pending patent applications may not be allowed in the future. We cannot be certain that an allowed patent application will become an issued patent. There may be events that cause withdrawal of the allowance of a patent application. For example, after a patent application has been allowed, but prior to being issued, material that could be relevant to patentability may be identified. In such circumstances, the applicant may pull the application from allowance in order for the USPTO to review the application in view of the

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new material. We cannot be certain that the USPTO will issue the application in view of the new material. Further, periodic maintenance fees on any issued patent are due to be paid to the USPTO and foreign countries may require the payment of maintenance fees or patent annuities during the lifetime of a patent application and/or any subsequent patent that issues from the application. The USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent application process and following the issuance of a patent. While an inadvertent lapse can in many cases be cured by payment of a late fee or by other means in accordance with the applicable rules, there are situations in which noncompliance can result in abandonment or lapse of the patent or patent application. Such noncompliance can result in partial or complete loss of patent rights in the relevant jurisdiction. Noncompliance events that could result in abandonment or lapse of a patent or patent application include, but are not limited to, failure to respond to official actions within prescribed time limits, non-payment of fees and failure to properly legalize and submit formal documents. Such an event could have a material adverse effect on our business.

Issued patents covering our product candidates could be found invalid or unenforceable if challenged in court or the USPTO.

If we or one of our licensing partners initiate legal proceedings against a third party to enforce a patent covering one of our product candidates, the defendant could counterclaim that the patent covering our product candidate, as applicable, is invalid and/or unenforceable. In patent litigation in the United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace, and there are various grounds upon which a third party can assert invalidity or unenforceability of a patent. Third parties may also raise similar claims before administrative bodies in the United States or abroad, even outside the context of litigation. Such mechanisms include re-examination, inter partes review, post grant review and equivalent proceedings in foreign jurisdictions (such as opposition proceedings). Such proceedings could result in revocation or amendment to our patents in such a way that they no longer cover our product candidates. The outcome following legal assertions of invalidity and unenforceability is unpredictable. With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art, of which we, our patent counsel and the patent examiner were unaware during prosecution. If a defendant were to prevail on a legal assertion of invalidity and/or unenforceability, or if we are otherwise unable to adequately protect our rights, we would lose at least part, and perhaps all, of the patent protection on our product candidates. Such a loss of patent protection could have a material adverse impact on our business and our ability to commercialize or license our technology and product candidates.

Changes to patent law in the United States and in foreign jurisdictions could diminish the value of patents in general, thereby impairing our ability to protect our products.

As is the case with other drug and biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the drug and biopharmaceutical industry involves both technological and legal complexity, and is therefore costly, time-consuming and inherently uncertain. In addition, the United States has passed wide-ranging patent reform legislation under the AIA. Moreover, recent U.S. Supreme Court rulings have narrowed the scope of patent protection available in certain circumstances and weakened the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts, and the USPTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents or to enforce our existing patents and patents that we might obtain in the future. We cannot predict how future decisions by the courts, Congress or the USPTO may impact the value of our patents. Similarly, any adverse changes in the patent laws of other jurisdictions could have a material adverse effect on our business and financial condition. Changes in the laws and regulations governing patents in other jurisdictions could similarly have an adverse effect on our ability to obtain and effectively enforce our patent rights.

Our European patents and patent applications could be challenged in the recently created Unified Patent Court, or UPC, for the European Union, that is expected to be fully ratified in 2023. We may decide to opt out our European patents and patent applications from the UPC. However, if certain formalities and requirements are not met, our European patents and patent applications could be challenged for non-compliance and brought under the jurisdiction of the UPC. We cannot be certain that our European patents and patent applications will avoid falling under the jurisdiction of the UPC, if we decide to opt out of the UPC. Under the UPC, a granted European patent would be valid and enforceable in numerous European countries. A successful invalidity challenge to a European patent under the UPC would result in loss of patent protection in those European countries. Accordingly, a single proceeding under the UPC could result in the partial or complete loss of patent protection in numerous European countries, rather than in each validated European country separately as such patents always have been adjudicated. Such a loss of patent protection could have a material adverse impact on our business and our ability to commercialize our technology and product candidates and, resultantly, on our business, financial condition, prospects and results of operations.

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We have limited foreign intellectual property rights and may not be able to protect our intellectual property rights throughout the world.

Certain of our key patent families have been filed in the United States; however, we have less robust intellectual property rights outside the United States, and, in particular, we may not be able to pursue patent coverage of our product candidates in certain countries outside of the United States. Filing, prosecuting and defending patents on product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States may be less extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. The breadth and strength of our patents issued in foreign jurisdictions or regions may not be the same as the corresponding patents issued in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise infringing products to certain territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing. Most of our patent portfolio is at the very early stage. We will need to decide whether and in which jurisdictions to pursue protection for the various inventions in our portfolio prior to applicable deadlines.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protections, particularly those relating to drug and biopharmaceutical products. This difficulty with enforcing patents could make it difficult for us to stop the infringement of our patents or marketing of competing products otherwise generally in violation of our proprietary rights. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly, put our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

We may be subject to claims challenging the inventorship or ownership of our patents and other intellectual property.

We generally enter into confidentiality and intellectual property assignment agreements with our employees, consultants, and contractors. These agreements generally provide that inventions conceived by the party in the course of rendering services to us will be our exclusive property. However, those agreements may not be honored and may not effectively assign intellectual property rights to us. Moreover, there may be some circumstances, where we are unable to negotiate for such ownership rights. Disputes regarding ownership or inventorship of intellectual property can also arise in other contexts, such as collaborations and sponsored research. If we are subject to a dispute challenging our rights in or to patents or other intellectual property, such a dispute could be expensive and time-consuming. If we were unsuccessful, we could lose valuable rights in intellectual property that we regard as our own.

The intellectual property landscape around our radiopharmaceutical product candidates is crowded, and third parties may initiate legal proceedings alleging that we are infringing, misappropriating, or otherwise violating their intellectual property rights, the outcome of which would be uncertain and could have a material adverse effect on the success of our business. We are aware of certain third-party patents and third-party patent applications in this landscape that may, if issued as patents, be asserted to encompass our technology.

We may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential information of third parties.

We have received confidential and proprietary information from third parties. In addition, we employ individuals who were previously employed at other biotechnology or pharmaceutical companies. We may be subject to claims that we or our employees, consultants or independent contractors have inadvertently or otherwise used or disclosed confidential information of these third parties or our employees’ former employers or our consultants’ or contractors’ current or former clients or customers. Litigation may be necessary to defend against these claims. Even if we are successful in defending against these claims, litigation could result in substantial cost and be a distraction to our management and employees. If we are not successful, we could lose access or exclusive access to valuable intellectual property.

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We may be subject to damages resulting from claims that we or our employees have wrongfully used or disclosed alleged trade secrets of our competitors or are in breach of non-competition or non-solicitation agreements with our competitors.

Many of our employees were previously employed at other biotechnology and pharmaceutical companies, including our competitors or potential competitors, in some cases until recently. We may be subject to claims that we or our employees have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of these former employers or competitors. In addition, we may in the future be subject to claims that we caused an employee to breach the terms of his or her non-competition or non-solicitation agreement. Litigation may be necessary to defend against these claims. Even if we are successful in defending against these claims, litigation could result in substantial costs and could be a distraction to management. If our defense to those claims fails, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. Any litigation or the threat thereof may adversely affect our ability to hire employees. A loss of key personnel or their work product could hamper or prevent our ability to commercialize product candidates, which could have an adverse effect on our business, financial condition and results of operations.

If we do not obtain patent term extension and data exclusivity for any of our current or future product candidates, our business may be materially harmed.

Depending upon the timing, duration and specifics of any FDA marketing approval of any of our current or future product candidates, one or more of our U.S. patents may be eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, or the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent extension term of up to five years as compensation for patent term lost during the FDA regulatory review process. A patent term extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval, only one patent may be extended and only those claims covering the approved drug, a method for using it, or a method for manufacturing it may be extended. However, we may not be granted an extension because of, for example, failing to exercise due diligence during the testing phase or regulatory review process, failing to apply for a patent extension within applicable deadlines, failing to apply prior to expiration of relevant patents, or otherwise failing to satisfy applicable requirements. Moreover, the applicable time period or the scope of patent protection afforded could be less than we request. If we are unable to obtain patent term extension or the term of any such extension is less than we believe we are entitled to, our competitors may obtain approval of competing products sooner than we would expect, and our business, financial condition, results of operations, and prospects could be materially harmed.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our marks of interest and our business may be adversely affected.

Our trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. We rely on both registration and common law protection for our trademarks. We may not be able to protect our rights to these trademarks and trade names or may be forced to stop using these names, which we need for name recognition by potential partners or customers in our markets of interest. During the trademark registration process, we may receive Office Actions from the USPTO objecting to the registration of our trademark. Although we would be given an opportunity to respond to those objections, we may be unable to overcome such rejections. In addition, in the USPTO and in comparable agencies in many foreign jurisdictions, third parties are given an opportunity to oppose pending trademark applications and/or to seek the cancellation of registered trademarks. Opposition or cancellation proceedings may be filed against our trademarks, and our trademarks may not survive such proceedings. If we are unable to establish name recognition based on our trademarks and trade names, we may not be able to compete effectively and our business may be adversely affected.

Numerous factors may limit any potential competitive advantage provided by our intellectual property rights.

The degree of future protection afforded by our intellectual property rights, whether owned or in-licensed, is uncertain because intellectual property rights have limitations, and may not adequately protect our business, provide a barrier to entry against our competitors or potential competitors, or permit us to maintain our competitive advantage. Moreover, if a third party has intellectual property rights that cover the practice of our technology, we may not be able to fully exercise or extract value from our intellectual property rights. The following examples are illustrative:

•pending patent applications that we own or license may not lead to issued patents;

•patents, should they issue, that we own or license, may not provide us with any competitive advantages, or may be challenged and held invalid or unenforceable;

•others may be able to develop and/or practice technology that is similar to our technology or aspects of our technology but that is not covered by the claims of any of our owned or in-licensed patents, should any such patents issue;

•third parties may compete with us in jurisdictions where we do not pursue and obtain patent protection;

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•we (or our licensors) might not have been the first to make the inventions covered by a pending patent application that we own or license;

•we (or our licensors) might not have been the first to file patent applications covering a particular invention;

•others may independently develop similar or alternative technologies without infringing our intellectual property rights;

•we may not be able to obtain and/or maintain necessary licenses on reasonable terms or at all;

•third parties may assert an ownership interest in our intellectual property and, if successful, such disputes may preclude us from exercising exclusive rights, or any rights at all, over that intellectual property;

•we may not be able to maintain the confidentiality of our trade secrets or other proprietary information;

•we may not develop or in-license additional proprietary technologies that are patentable; and

•the patents of others may have an adverse effect on our business.

Should any of these events occur, they could materially harm our business and the results of our operation.

Risks Related to Employee Matters and Managing Growth

We are highly dependent on our key personnel, and if we are not successful in attracting and retaining highly qualified personnel, we may not be able to successfully implement our business strategy.

Our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends upon our ability to attract and retain highly qualified managerial, scientific and medical personnel. We are highly dependent on our management, scientific and medical personnel, including John Valliant, our Chief Executive Officer. The loss of the services of any of our executive officers, other key employees and other scientific and medical advisors, and an inability to find suitable replacements could result in delays in product development and harm our business.

We conduct our operations at our facilities in Hamilton, Ontario and Boston, Massachusetts. These regions are headquarters to many other drug and biopharmaceutical companies and many academic and research institutions. Competition for skilled personnel in our market is intense and may limit our ability to hire and retain highly qualified personnel on acceptable terms or at all. Changes to U.S., Canadian or similar foreign immigration and work authorization laws and regulations, including those that restrain the flow of scientific and professional talent, can be significantly affected by political forces and levels of economic activity. Our business may be materially adversely affected if legislative or administrative changes to U.S., Canadian or similar foreign immigration or visa laws and regulations impair our hiring processes and goals or projects involving personnel who are not U.S. or Canadian citizens.

To encourage valuable employees to remain at our company, in addition to salary and cash incentives, we have provided stock options that vest over time. The value to employees of stock options that vest over time may be significantly affected by movements in our share price that are beyond our control, and may at any time be insufficient to counteract more lucrative offers from other companies. Despite our efforts to retain valuable employees, members of our management, scientific and development teams may terminate their employment with us on short notice. Although we have employment agreements with our key employees, these employment agreements provide for at-will employment, which means that any of our employees could leave our employment at any time, with or without notice. Our success also depends on our ability to continue to attract, retain and motivate highly skilled junior, mid-level and senior managers as well as junior, mid-level and senior scientific and medical personnel.

We will need to grow the size of our organization, and we may experience difficulties in managing this growth.

As of March 31, 2023, we had 106 full-time employees. As our development and commercialization plans and strategies develop, we expect to need additional managerial, operational, sales, marketing, financial and other personnel, as well as additional facilities to expand our operations. Future growth would impose significant added responsibilities on members of management, including:

•identifying, recruiting, integrating, maintaining and motivating additional employees;

•managing our internal development efforts effectively, including the clinical and FDA review process for our product candidates, while complying with our contractual obligations to contractors and other third parties; and

•improving our operational, financial and management controls, reporting systems and procedures.

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Our future financial performance and our ability to commercialize our product candidates will depend, in part, on our ability to effectively manage any future growth, and our management may also have to divert a disproportionate amount of its attention away from day-to-day activities in order to devote a substantial amount of time to managing these growth activities.

We currently rely, and for the foreseeable future will continue to rely, in substantial part on certain independent organizations, advisors and consultants to provide certain services, including certain aspects of regulatory approval, clinical trial management and manufacturing. There can be no assurance that the services of independent organizations, advisors and consultants will continue to be available to us on a timely basis when needed, or that we can find qualified replacements. In addition, if we are unable to effectively manage our outsourced activities or if the quality or accuracy of the services provided by consultants is compromised for any reason, our clinical trials may be extended, delayed or terminated, and we may not be able to obtain regulatory approval of our product candidates or otherwise advance our business. There can be no assurance that we will be able to manage our existing consultants or find other competent outside contractors and consultants on economically reasonable terms, or at all. If we are not able to effectively expand our organization by hiring new employees and expanding our groups of consultants and contractors, or we are not able to effectively build out new facilities to accommodate this expansion, we may not be able to successfully implement the tasks necessary to further develop and commercialize our product candidates and, accordingly, may not achieve our research, development and commercialization goals.

Risks Related to Ownership of our Common Shares

The price of our common shares may be volatile, and you could lose all or part of your investment.

The trading price of our common shares is likely to be highly volatile and could be subject to wide fluctuations in response to various factors, some of which are beyond our control, including limited trading volume These factors include:

•the results of our ongoing, planned or any future preclinical studies, clinical trials or clinical development programs;

•the commencement, enrollment or results of clinical trials of our product candidates or any future clinical trials we may conduct, or changes in the development status of our product candidates;

•adverse results or delays in preclinical studies and clinical trials;

•our decision to initiate a clinical trial, not to initiate a clinical trial or to terminate an existing clinical trial;

•any delay in our regulatory filings or any adverse regulatory decisions, including failure to receive regulatory approval of our product candidates;

•changes in laws or regulations applicable to our products, including but not limited to clinical trial requirements for approvals;

•adverse developments concerning our manufacturers or our manufacturing plans;

•our inability to obtain adequate product supply for any licensed product or inability to do so at acceptable prices;

•our inability to establish collaborations, if needed;

•our failure to commercialize our product candidates;

•departures of key scientific or management personnel;

•unanticipated serious safety concerns related to the use of our product candidates;

•introduction of new products or services offered by us or our competitors;

•announcements of significant acquisitions, strategic partnerships, joint ventures or capital commitments by us or our competitors;

•our ability to effectively manage our growth;

•the size and growth of our initial cancer target markets;

•our ability to successfully treat additional types of cancers or at different stages;

•actual or anticipated variations in quarterly operating results;

•our cash position;

•our failure to meet the estimates and projections of the investment community or that we may otherwise provide to the public;

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•publication of research reports about us or our industry, or immunotherapy in particular, or positive or negative recommendations or withdrawal of research coverage by securities analysts;

•changes in the market valuations of similar companies;

•overall performance of the equity markets;

•sales of our common shares by us or our shareholders in the future;

•trading volume of our common shares;

•changes in accounting practices;

•ineffectiveness of our internal controls;

•disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain patent protection for our technologies;

•significant lawsuits, including patent or shareholder litigation;

•general political and economic conditions; and

•other events or factors, many of which are beyond our control.

In addition, the stock market in general, and The Nasdaq Global Select Market and drug and biopharmaceutical companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market price of our common shares, regardless of our actual operating performance. In the past, securities class action litigation has often been instituted against companies following periods of volatility in the market price of a company’s securities. This type of litigation, if instituted, could result in substantial costs and a diversion of management’s attention and resources, which would harm our business, financial condition and results of operations.

An active trading market for our common shares may not develop or be sustainable, and you may not be able to resell your shares at or above the purchase price.

In June 2020, we closed our initial public offering. Prior to that offering, there was no public market for our common shares. Although we have completed our initial public offering and our common shares are listed and trading on the Nasdaq Global Select Market, an active trading market for our shares may not be sustained. If an active market for our common shares does not continue, it may be difficult for our shareholders to sell their shares without depressing the market price for the shares or sell their shares at or above the prices at which they acquired their shares or sell their shares at the time they would like to sell. Any inactive trading market for our common shares may also impair our ability to raise capital to continue to fund our operations by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.

If securities analysts publish negative evaluations of our stock, the price of our stock could decline.

The trading market for our common shares will rely, in part, on the research and reports that industry or financial analysts publish about us or our business. If one or more of the analysts covering our business downgrade their evaluations of our shares, the price of our shares could decline. If one or more of these analysts cease to cover our common shares, we could lose visibility in the market for our common shares, which, in turn, could cause our common share price to decline.

We do not intend to pay dividends on our common shares, so any returns will be limited to the value of our common shares.

We currently anticipate that we will retain future earnings for the development, operation and expansion of our business and do not anticipate declaring or paying any cash dividends for the foreseeable future. In addition, the terms of our Loan Agreement preclude us from paying dividends without the lenders’ consent, and any future debt agreements that we may enter into may preclude us from paying dividends without the lenders’ consent or at all. Any return to shareholders will therefore be limited to the appreciation of their common shares, which may never occur.

Our principal shareholders and management own a significant percentage of our shares and will be able to exert significant influence over matters subject to shareholder approval.

Our executive officers, directors, and 5% shareholders beneficially own a significant portion of our common shares. Therefore, these shareholders may have the ability to influence us through this ownership position. These shareholders may be able to determine

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all matters requiring shareholder approval. For example, these shareholders may be able to control elections of directors, amendments of our organizational documents or approval of any merger, sale of assets or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common shares that you may feel are in your best interest as one of our shareholders.

We are an emerging growth company and a smaller reporting company, and we cannot be certain if the reduced reporting requirements applicable to emerging growth companies and smaller reporting companies will make our common shares less attractive to investors.

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act, or JOBS Act. For as long as we continue to be an emerging growth company, we may take advantage of exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, as amended, or the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, exemptions from the requirements of holding nonbinding advisory votes on executive compensation and shareholder approval of any golden parachute payments not previously approved, and an exemption from compliance with the requirement of the Public Accounting Oversight Board regarding the communication of critical audit matters in the auditor’s report on the financial statements. We could be an emerging growth company for up to five years following the year in which we completed our initial public offering, although circumstances could cause us to lose that status earlier. We will remain an emerging growth company until the earlier of (1) the last day of the fiscal year (a) following the fifth anniversary of the date of the closing of our initial public offering, (b) in which we have total annual gross revenue of at least $1.235 billion or (c) in which we are deemed to be a large accelerated filer, which requires the market value of our common shares that are held by non-affiliates to exceed $700 million as of the prior June 30th, and (2) the date on which we have issued more than $1.0 billion in non-convertible debt during the prior three-year period.

Under the JOBS Act, emerging growth companies can also delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, we are not subject to the same new or revised accounting standards as other public companies that are not emerging growth companies and our financial statements may not be comparable to other public companies that comply with new or revised accounting pronouncements as of public company effective dates. We may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for private companies.

Further, even after we no longer qualify as an emerging growth company, we may still qualify as a “smaller reporting company,” which would allow us to take advantage of many of the same exemptions from disclosure requirements, including reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements. In addition, if we are a smaller reporting company with less than $100 million in annual revenue, we would not be required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, or Section 404.

We cannot predict if investors will find our common shares less attractive because we may rely on these exemptions. If some investors find our common shares less attractive as a result, there may be a less active trading market for our common shares and our share price may be more volatile.

We have incurred, and will continue to incur significant increased costs as a result of operating as a public company, and our management is required to devote substantial time to new compliance initiatives.

As a public company, we have incurred, and will continue to incur significant legal, accounting, insurance and other expenses that we did not incur as a private company. We are subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the Exchange Act, which requires, among other things, that we file with the SEC annual, quarterly and current reports with respect to our business and financial condition. In addition, the Sarbanes-Oxley Act, as well as rules subsequently adopted by the Securities and Exchange Commission, or SEC, and The Nasdaq Global Select Market to implement provisions of the Sarbanes-Oxley Act, impose significant requirements on public companies, including requiring establishment and maintenance of effective disclosure and financial controls and changes in corporate governance practices. Further, in July 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act, or the Dodd-Frank Act, was enacted. There are significant corporate governance and executive compensation related provisions in the Dodd-Frank Act that require the SEC to adopt additional rules and regulations in these areas, such as “say-on-pay” and proxy access. Recent legislation permits emerging growth companies to implement many of these requirements over a longer period and up to five years from the pricing of our initial public offering. We intend to take advantage of this new legislation but cannot guarantee that we will not be required to implement these requirements sooner than budgeted or planned and thereby incur unexpected expenses. Shareholder activism, the current political environment and the current high level of government intervention and regulatory

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reform may lead to substantial new regulations and disclosure obligations, which may lead to additional compliance costs and impact the manner in which we operate our business in ways we cannot currently anticipate.

Pursuant to Section 404, in our second annual report due to be filed with the SEC after becoming a public company, we will be required to furnish a report by our management on our internal control over financial reporting. However, while we remain an emerging growth company or a smaller reporting company with less than $100 million in annual revenue, we will not be required to include an attestation report on internal control over financial reporting issued by our independent registered public accounting firm. To achieve compliance with Section 404 within the prescribed period, we will be engaged in a process to document and evaluate our internal control over financial reporting, which is both costly and challenging. In this regard, we will need to continue to dedicate internal resources, potentially engage outside consultants, adopt a detailed work plan to assess and document the adequacy of internal control over financial reporting, continue steps to improve control processes as appropriate, validate through testing whether such controls are functioning as documented, and implement a continuous reporting and improvement process for internal control over financial reporting. Despite our efforts, there is a risk that we will not be able to conclude, within the prescribed timeframe or at all, that our internal control over financial reporting is effective as required by Section 404. In addition, investors’ perceptions that our internal controls are inadequate or that we are unable to produce accurate financial statements on a timely basis may harm the market price of our shares.

Sales of a substantial number of our common shares by our existing shareholders in the public market could cause our share price to fall.

If our existing shareholders sell, or indicate an intention to sell, substantial amounts of our common shares in the public market, the market price of our common shares could decline. In addition, common shares that are either subject to outstanding options or reserved for future issuance under our 2020 Plan and our 2020 Employee Share Purchase Plan will become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules and certain rules under the Securities Act of 1933, as amended, or the Securities Act. Additionally, common shares that are issuable upon the exercise of outstanding warrants to purchase our common shares will become eligible for sale in the public market to the extent permitted by Rule 144 and Rule 701 under the Securities Act. If these additional common shares are sold, or if it is perceived that they will be sold, in the public market, the trading price of our common shares could decline.

Our by-laws and certain Canadian legislation contain provisions that may have the effect of delaying, preventing or making undesirable an acquisition of all or a significant portion of our shares or assets or preventing a change in control.

Certain provisions of our by-laws and certain Canadian legislation, together or separately, could discourage potential acquisition proposals, delay or prevent a change in control and limit the price that certain investors may be willing to pay for our common shares. For instance, our by-laws contain provisions that establish certain advance notice procedures for nomination of candidates for election as directors at shareholders’ meetings. The Canada Business Corporations Act requires that any shareholder proposal that includes nominations for the election of directors must be signed by one or more holders of shares representing in the aggregate not less than five percent of the shares or five percent of a class of shares of the corporation entitled to vote at the meeting to which the proposal is to be presented.

A non-Canadian must file an application for review with the Minister responsible for the Investment Canada Act and obtain approval of the Minister prior to acquiring control of a “Canadian business” within the meaning of the Investment Canada Act, where prescribed financial thresholds are exceeded. A reviewable acquisition may not proceed unless the Minister is satisfied that the investment is likely to be of net benefit to Canada. This could prevent or delay a change of control and may eliminate or limit strategic opportunities for shareholders to sell their common shares. Furthermore, limitations on the ability to acquire and hold our common shares may be imposed by the Competition Act (Canada). This legislation permits the Commissioner of Competition, or Commissioner, to review any acquisition or establishment, directly or indirectly, including through the acquisition of shares, of control over or of a significant interest in us. Otherwise, there are no limitations under the laws of Canada, or in the Articles of the Corporation, as amended, on the rights of non-Canadians to hold or vote our common shares. Any of these provisions may discourage a potential acquirer from proposing or completing a transaction that may have otherwise presented a premium to our shareholders.

Our by-laws designate specific courts in Canada and the United States as the exclusive forum for certain litigation that may be initiated by our shareholders, which could limit our shareholders’ ability to obtain a favorable judicial forum for disputes with us.

Pursuant to our by-laws, unless we consent in writing to the selection of an alternative forum, the courts of the Province of Ontario and the appellate courts therefrom shall, to the fullest extent permitted by law, be the sole and exclusive forum for: (a) any derivative action or proceeding brought on our behalf; (b) any action or proceeding asserting a claim of breach of fiduciary duty owed by any director, officer or other employee of ours to us; (c) any action or proceeding asserting a claim arising out of any provision of the Canada Business Corporations Act or our articles or by-laws (as either may be amended from time to time); or (d) any action or proceeding

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asserting a claim or otherwise related to our affairs, or the Canadian Forum Provision. The Canadian Forum Provision will not apply to any causes of action arising under the Securities Act or the Exchange Act. In addition, our by-laws further provide that unless we consent in writing to the selection of an alternative forum, the United States District Court for the District of Massachusetts shall be the sole and exclusive forum for resolving any complaint filed in the United States asserting a cause of action arising under the Securities Act, or the U.S. Federal Forum Provision. In addition, our by-laws provide that any person or entity purchasing or otherwise acquiring any interest in our common shares is deemed to have notice of and consented to the Canadian Forum Provision and the U.S. Federal Forum Provision; provided, however, that shareholders cannot and will not be deemed to have waived our compliance with the U.S. federal securities laws and the rules and regulations thereunder.

The Canadian Forum Provision and the U.S. Federal Forum Provision in our by-laws may impose additional litigation costs on shareholders in pursuing any such claims. Additionally, the forum selection clauses in our by-laws may limit our shareholders’ ability to bring a claim in a judicial forum that they find favorable for disputes with us or our directors, officers or employees, which may discourage the filing of lawsuits against us and our directors, officers and employees, even though an action, if successful, might benefit our shareholders. In addition, while the Delaware Supreme Court ruled in March 2020 that federal forum selection provisions purporting to require claims under the Securities Act be brought in federal court are “facially valid” under Delaware law, there is uncertainty as to whether other courts, including courts in Canada and other courts within the U.S., will enforce our U.S. Federal Forum Provision. If the U.S. Federal Forum Provision is found to be unenforceable, we may incur additional costs associated with resolving such matters. The U.S. Federal Forum Provision may also impose additional litigation costs on shareholders who assert that the provision is not enforceable or invalid. The courts of the Province of Ontario and the United States District Court for the District of Massachusetts may also reach different judgments or results than would other courts, including courts where a shareholder considering an action may be located or would otherwise choose to bring the action, and such judgments may be more or less favorable to us than our shareholders.

Because we are a Canadian company, it may be difficult to serve legal process or enforce judgments against us.

We are incorporated and maintain operations in Canada. In addition, while many of our directors and officers reside in the United States, several of them reside outside of the United States. Accordingly, service of process upon us may be difficult to obtain within the United States. Furthermore, because certain of our assets are located outside the United States, any judgment obtained in the United States against us, including one predicated on the civil liability provisions of the U.S. federal securities laws, may not be collectible within the United States. Therefore, it may not be possible to enforce those actions against us.

In addition, it may be difficult to assert U.S. securities law claims in original actions instituted in Canada. Canadian courts may refuse to hear a claim based on an alleged violation of U.S. securities laws against us or these persons on the grounds that Canada is not the most appropriate forum in which to bring such a claim. Even if a Canadian court agrees to hear a claim, it may determine that Canadian law and not U.S. law is applicable to the claim. If U.S. law is found to be applicable, the content of applicable U.S. law must be proved as a fact, which can be a time-consuming and costly process. Certain matters of procedure will also be governed by Canadian law. Furthermore, it may not be possible to subject foreign persons or entities to the jurisdiction of the courts in Canada. Similarly, to the extent that our assets are located in Canada, investors may have difficulty collecting from us any judgments obtained in the U.S. courts and predicated on the civil liability provisions of U.S. securities provisions.

If we fail to establish and maintain proper and effective internal control over financial reporting, our operating results and our ability to operate our business could be harmed.

Effective internal control over financial reporting is necessary for us to provide reliable financial reports and, together with effective disclosure controls and procedures, are designed to prevent or detect material misstatements due to fraud or error. Any failure to implement required new or improved controls, or difficulties encountered in their implementation could cause us to fail to meet our reporting obligations. In addition, any testing conducted by us in connection with Section 404 of the Sarbanes-Oxley Act, or any subsequent testing by our independent registered public accounting firm, may reveal deficiencies in our internal control over financial reporting that are deemed to be material weaknesses or that may require prospective or retroactive changes to our financial statements or identify other areas for further attention or improvement. Inadequate internal controls could also cause investors to lose confidence in our reported financial information, which could have a negative effect on the trading price of our common shares.

Implementing any appropriate changes to our internal controls may distract our officers and employees, entail substantial costs to modify our existing processes, and take significant time to complete. These changes may not, however, be effective in maintaining the adequacy of our internal controls, and any failure to maintain that adequacy, or consequent inability to produce accurate financial statements on a timely basis, could increase our operating costs and harm our business. In our efforts to maintain proper and effective internal control over financial reporting, we may discover material weaknesses in our internal control over financial reporting, which we may not successfully remediate on a timely basis or at all. Any failure to identify or remediate any material weaknesses identified by us or to implement required new or improved controls, or difficulties encountered in their implementation, could cause us to fail to meet our reporting obligations or result in material misstatements in our financial statements. If we identify one or more material

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weaknesses in the future, it could result in an adverse reaction in the financial markets due to a loss of confidence in the reliability of our financial statements, which may harm the market price of our shares.

If we are a CFC there could be materially adverse U.S. federal income tax consequences to certain U.S. Holders of our common shares.

Each “Ten Percent Shareholder” (as defined below) in a non-U.S. corporation that is classified as a controlled foreign corporation, or a CFC, for U.S. federal income tax purposes generally is required to include in income for U.S. federal tax purposes such Ten Percent Shareholder’s pro rata share of the CFC’s “Subpart F income,” global intangible low taxed income, and investment of earnings in U.S. property, even if the CFC has made no distributions to its shareholders. Subpart F income generally includes dividends, interest, rents, royalties, gains from the sale of securities and income from certain transactions with related parties. In addition, a Ten Percent Shareholder that realizes gain from the sale or exchange of shares in a CFC may be required to classify a portion of such gain as dividend income rather than capital gain. An individual that is a Ten Percent Shareholder with respect to a CFC generally would not be allowed certain tax deductions or foreign tax credits that would be allowed to a Ten Percent Shareholder that is a U.S. corporation. Failure to comply with these reporting obligations may subject a Ten Percent Shareholder to significant monetary penalties and may prevent the statute of limitations with respect to such Ten Percent Shareholder’s U.S. federal income tax return for the year for which reporting was due from starting.

A non-U.S. corporation generally will be classified as a CFC for U.S. federal income tax purposes if Ten Percent Shareholders own, directly or indirectly, more than 50% of either the total combined voting power of all classes of stock of such corporation entitled to vote or of the total value of the stock of such corporation. A ‘‘Ten Percent Shareholder’’ is a United States person (as defined by the Code) who owns or is considered to own 10% or more of the total combined voting power of all classes of stock entitled to vote or 10% or more of the total value of all classes of stock of such corporation. We believe that we were not a CFC in the 2022 taxable year, however, it is possible that we may become a CFC in the 2023 taxable year or in a subsequent taxable year. The determination of CFC status is complex and includes attribution rules, the application of which is not entirely certain. In addition, recent changes to the attribution rules relating to the determination of CFC status may make it difficult to determine our CFC status for any taxable year. In addition, it is possible that a shareholder treated as a U.S. person for U.S. federal income tax purposes will acquire, directly or indirectly, enough of our common shares to be treated as a Ten Percent Shareholder. We cannot provide any assurances that we will assist holders of our common shares in determining whether we are treated as a CFC or whether any holder of the common shares is treated as a Ten Percent Shareholder with respect to any such CFC or furnish to any Ten Percent Shareholders information that may be necessary to comply with the aforementioned reporting and tax paying obligations.

U.S. Holders should consult their tax advisors with respect to the potential adverse U.S. tax consequences of becoming a Ten Percent Shareholder in a CFC. If we are classified as both a CFC and a PFIC (as defined below), we generally will not be treated as a PFIC with respect to those U.S. Holders that meet the definition of a Ten Percent Shareholder during the period in which we are a CFC.

We may be or become a passive foreign investment company, which could result in adverse U.S. federal income tax consequences to U.S. Holders.

The rules governing passive foreign investment companies, or PFICs, can have adverse effects on holders of our common shares who, for U.S. federal income tax purposes, are a beneficial owner of common shares and are (i) an individual who is a citizen or resident of the United States; (ii) a corporation, or other entity taxable as a corporation, created or organized in or under the laws of the United States, any state therein or the District of Columbia; (iii) an estate the income of which is subject to U.S. federal income taxation regardless of its source; or (iv) a trust if (1) a U.S. court is able to exercise primary supervision over the administration of the trust and one or more U.S. persons have authority to control all substantial decisions of the trust or (2) the trust has a valid election to be treated as a U.S. person under applicable U.S. Treasury Regulations (each such holder, a “U.S. Holder”) for U.S. federal income tax purposes.

Generally, if, for any taxable year, at least 75% of our gross income is passive income (the “income test”), or at least 50% of the value of our assets (generally, using a quarterly average) is attributable to assets that produce passive income or are held for the production of passive income (including cash) (the “asset test”), we would be characterized as a PFIC for U.S. federal income tax purposes. The determination of whether we are a PFIC, which must be made annually after the close of each taxable year, depends on the particular facts and circumstances and may also be affected by the application of the PFIC rules, which are subject to differing interpretations. Our status as a PFIC will depend on the composition of our income and the composition and value of our assets (including goodwill and other intangible assets), which will be affected by how, and how quickly, we spend any cash that is raised in any financing transaction. As a publicly traded CFC or not a CFC for such year, the value of our assets generally may be determined by reference to the market value of our common shares, which may be volatile. Moreover, our ability to earn specific types of income that will be treated as non-passive for purposes of the PFIC rules is uncertain with respect to future years. For our taxable year ended December 31, 2022, we believe we may be classified as a PFIC, however it is uncertain whether we will be a PFIC for our taxable year ending December

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31, 2023 or future taxable years. We cannot provide any assurances regarding our PFIC status for any past, current or future taxable years.

If we are a PFIC during a U.S. Holder’s holding period, such U.S. Holder would be subject to adverse U.S. federal income tax consequences, such as ineligibility for certain preferred tax rates on capital gains or on actual or deemed dividends, interest charges on certain taxes treated as deferred, and additional reporting requirements under U.S. federal income tax laws and regulations. A U.S. Holder may in certain circumstances mitigate adverse tax consequences of the PFIC rules by filing an election to treat the PFIC as a qualified electing fund, or QEF, or, if shares of the PFIC are “marketable stock” for purposes of the PFIC rules, by making a mark-to-market election with respect to the shares of the PFIC. We will determine our PFIC status at the end of each taxable year and will satisfy any applicable record keeping and reporting requirements that apply to a QEF, including providing to you, for each taxable year that we determine we are or, in our reasonable determination, may be a PFIC (in which case we will also determine the PFIC status of each of our subsidiaries), a PFIC Annual Information Statement containing information necessary for you to make a QEF Election with respect to us. We may elect to provide such information on our website. You are urged to consult your tax advisors regarding our PFIC status, the potential consequences to you if we were to become a PFIC, including the availability, and advisability, of, and procedure for making, QEF elections.

General Risks

Adverse developments affecting the financial services industry, such as actual events or concerns involving liquidity, defaults, or non-performance by financial institutions or transactional counterparties, could adversely affect the Company’s current and projected business operations and its financial condition and results of operations.

Actual events involving limited liquidity, defaults, non-performance or other adverse developments that affect financial institutions, transactional counterparties or other companies in the financial services industry or the financial services industry generally, or concerns or rumors about any events of these kinds or other similar risks, have in the past and may in the future lead to market-wide liquidity problems. For example, on March 10, 2023, Silicon Valley Bank (“SVB”) was closed by the California Department of Financial Protection and Innovation, which appointed the Federal Deposit Insurance Corporation (“FDIC”) as receiver. Similarly, on March 12, 2023, Signature Bank (“Signature”) and Silvergate Capital Corp. were each swept into receivership, and on May 1, 2023 First Republic Bank (“First Republic”) was placed into receivership. Although a statement by the Department of the Treasury, the Federal Reserve and the FDIC indicated that all depositors of SVB would have access to all of their money after only one business day of closure, including funds held in uninsured deposit accounts, borrowers under credit agreements, letters of credit and certain other financial instruments with SVB, Signature, First Republic or any other financial institution that is placed into receivership by the FDIC may be unable to access undrawn amounts thereunder. Although we are not a borrower or party to any such instruments with SVB, Signature, First Republic or any other financial institution currently in receivership, if any of our lenders or counterparties to any such instruments were to be placed into receivership, we may be unable to access such funds. In addition, if any of our customers, suppliers or other parties with whom we conduct business are unable to access funds pursuant to such instruments or lending arrangements with such a financial institution, such parties’ ability to pay their obligations to us or to enter into new commercial arrangements requiring additional payments to us could be adversely affected. In this regard, counterparties to SVB credit agreements and arrangements, and third parties such as beneficiaries of letters of credit (among others), may experience direct impacts from the closure of SVB and uncertainty remains over liquidity concerns in the broader financial services industry. Similar impacts have occurred in the past, such as during the 2008-2010 financial crisis.

Inflation and rapid increases in interest rates have led to a decline in the trading value of previously issued government securities with interest rates below current market interest rates. Although the U.S. Department of Treasury, FDIC and Federal Reserve Board have announced a program to provide up to $25 billion of loans to financial institutions secured by certain of such government securities held by financial institutions to mitigate the risk of potential losses on the sale of such instruments, widespread demands for customer withdrawals or other liquidity needs of financial institutions for immediate liquidity may exceed the capacity of such program. Additionally, there is no guarantee that the U.S. Department of Treasury, FDIC and Federal Reserve Board will provide access to uninsured funds in the future in the event of the closure of other banks or financial institutions, or that they would do so in a timely fashion.

Although we assess our banking and customer relationships as we believe necessary or appropriate, our access to funding sources and other credit arrangements in amounts adequate to finance or capitalize our current and projected future business operations could be significantly impaired by factors that affect the Company, the financial institutions with which the Company has credit agreements or arrangements directly, or the financial services industry or economy in general. These factors could include, among others, events such as liquidity constraints or failures, the ability to perform obligations under various types of financial, credit or liquidity agreements or arrangements, disruptions or instability in the financial services industry or financial markets, or concerns or negative expectations about the prospects for companies in the financial services industry. These factors could involve financial institutions or financial

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services industry companies with which the Company has financial or business relationships, but could also include factors involving financial markets or the financial services industry generally.

The results of events or concerns that involve one or more of these factors could include a variety of material and adverse impacts on our current and projected business operations and our financial condition and results of operations. These could include, but may not be limited to, the following:

•Delayed access to deposits or other financial assets or the uninsured loss of deposits or other financial assets;

•Delayed or lost access to, or reductions in borrowings available under the Loan Agreement, revolving existing credit facilities or other working capital sources and/or delays, inability or reductions in the company’s ability to refund, roll over or extend the maturity of, or enter into new credit facilities or other working capital resources;

•Potential or actual breach of contractual obligations that require the Company to maintain letters of credit or other credit support arrangements;

•Potential or actual breach of financial covenants in our Loan Agreement or other credit arrangements;

•Potential or actual cross-defaults in other credit agreements, credit arrangements or operating or financing agreements; or

•Termination of cash management arrangements and/or delays in accessing or actual loss of funds subject to cash management arrangements.

In addition, investor concerns regarding the U.S. or international financial systems could result in less favorable commercial financing terms, including higher interest rates or costs and tighter financial and operating covenants, or systemic limitations on access to credit and liquidity sources, thereby making it more difficult for us to acquire financing on acceptable terms or at all. Any decline in available funding or access to our cash and liquidity resources could, among other risks, adversely impact our ability to meet our operating expenses, financial obligations or fulfill our other obligations, result in breaches of our financial and/or contractual obligations or result in violations of federal or state wage and hour laws. Any of these impacts, or any other impacts resulting from the factors described above or other related or similar factors not described above, could have material adverse impacts on our liquidity and our current and/or projected business operations and financial condition and results of operations.

In addition, any further deterioration in the macroeconomic economy or financial services industry could lead to losses or defaults by our customers or suppliers, which in turn, could have a material adverse effect on our current and/or projected business operations and results of operations and financial condition. For example, a customer may fail to make payments when due, default under their agreements with us, become insolvent or declare bankruptcy, or a supplier may determine that it will no longer deal with us as a customer. In addition, a customer or supplier could be adversely affected by any of the liquidity or other risks that are described above as factors that could result in material adverse impacts on the Company, including but not limited to delayed access or loss of access to uninsured deposits or loss of the ability to draw on existing credit facilities involving a troubled or failed financial institution. Any customer or supplier bankruptcy or insolvency, or the failure of any customer to make payments when due, or any breach or default by a customer or supplier, or the loss of any significant supplier relationships, could result in material losses to the Company and may have a material adverse impact on our business.

We may be exposed to financial risk related to the fluctuation of foreign exchange rates and the degrees of volatility of those rates.

We may be adversely affected by foreign currency fluctuations. Our reporting currency is the U.S. dollar. The functional currency of our operating company in Canada, operating company in the United States and former non-operating company in Ireland is also the U.S. dollar. To date, we have been primarily funded through issuances of equity that have been denominated in U.S. dollars. However, a significant portion of our expenditures are paid in Canadian dollars, and we are, therefore, subject to foreign currency fluctuations that may, from time to time, impact our financial position and results of operations.

Our employees, independent contractors, consultants, commercial collaborators, principal investigators, vendors and other agents may engage in misconduct or other improper activities, including non-compliance with regulatory standards and requirements.

We are exposed to the risk that our employees, independent contractors, consultants, commercial collaborators, principal investigators, vendors and other agents may engage in fraudulent conduct or other illegal activity. Misconduct by these parties could include intentional, reckless or negligent conduct or disclosure of unauthorized activities to us that violates applicable regulations, including those laws requiring the reporting of true, complete and accurate information to regulatory agencies, manufacturing standards and U.S. federal and state healthcare laws and regulations. In particular, sales, marketing and business arrangements in the healthcare

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industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and other abusive practices. We could face liability under the U.S. federal Anti-Kickback Statute and similar U.S. state laws. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, referrals, customer incentive programs and other business arrangements. Misconduct by these parties could also involve the improper use of individually identifiable information, including, without limitation, information obtained in the course of clinical trials, which could result in significant regulatory sanctions and serious harm to our reputation. Further, should violations include promotion of unapproved (off-label) uses one or more of our products, we could face significant regulatory sanctions for unlawful promotion, as well as substantial penalties under the FCA, and similar state laws. Similar concerns could exist in jurisdictions outside of the United States as well. We have adopted a code of conduct applicable to all of our employees, but it is not always possible to identify and deter misconduct by employees and other third parties, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to comply with these laws or regulations. The precautions we take to detect and prevent misconduct may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business, including the imposition of civil, criminal and administrative penalties, damages, monetary fines, imprisonment, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of noncompliance with these laws, contractual damages, reputational harm, diminished profits and future earnings, and curtailment of our operations, any of which could adversely affect our ability to operate our business, financial condition and results of operations.

If our security measures are breached or unauthorized access to individually identifiable health information or other personally identifiable information is otherwise obtained, our reputation may be harmed, and we may incur significant liabilities.

Unauthorized access to, or security breaches of, our systems and databases could result in unauthorized access to data and information and loss, compromise or corruption of such data and information. Present and future CROs, contractors and consultants also could experience breaches of security leading to the exposure of confidential and sensitive information. Such breaches of security could be caused by computer hacking, phishing attacks, ransomware, dissemination of computer viruses, worms and other destructive or disruptive software, denial of service attacks, and other malicious activity, which may be heretofore unknown. The number and complexity of these threats continue to increase over time.

Most healthcare providers, including research institutions from which we obtain patient health information, are subject to privacy and security regulations promulgated under HIPAA, as amended by the HITECH. We are not currently classified as a covered entity or business associate under HIPAA and thus are not directly subject to its requirements or penalties. However, any person may be prosecuted under HIPAA’s criminal provisions either directly or under aiding-and-abetting or conspiracy principles. Consequently, depending on the facts and circumstances, we could face substantial criminal penalties if we knowingly receive individually identifiable health information from a HIPAA-covered healthcare provider or research institution that has not satisfied HIPAA’s requirements for disclosure of individually identifiable health information. In addition, we may maintain sensitive personally identifiable information, including health information, that we receive throughout the clinical trial process, in the course of our research collaborations, and directly from individuals (or their healthcare providers) who enroll in our patient assistance programs. As such, we may be subject to state laws requiring notification of affected individuals and state regulators in the event of a breach of personal information, which is a broader class of information than the health information protected by HIPAA.

Furthermore, certain health privacy laws, data breach notification laws, consumer protection laws and genetic testing laws may apply directly to our operations and/or those of our collaborators and may impose restrictions on our collection, use and dissemination of individuals’ health information. Patients about whom we or our collaborators obtain health information, as well as the providers who share this information with us, may have statutory or contractual rights that limit our ability to use and disclose the information. We may be required to expend significant capital and other resources to ensure ongoing compliance with applicable privacy and data security laws. Claims that we have violated individuals’ privacy rights or breached our contractual obligations, even if we are not found liable, could be expensive and time-consuming to defend and could result in adverse publicity that could harm our business.

In the event of a security breach, our company could suffer loss of business, severe reputational damage adversely affecting investor confidence, regulatory investigations and orders, litigation, indemnity obligations, damages for contract breach, penalties for violation of applicable laws or regulations, significant costs for remediation and other liabilities. For example, the loss of preclinical study or clinical trial data from completed or future preclinical studies or clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability and the further development and commercialization of our product candidates could be delayed.

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We have incurred and expect to incur significant expenses to prevent security breaches, including costs related to deploying additional personnel and protection technologies, training employees, and engaging third-party solution providers and consultants. Although we expend significant resources to create security protections that shield our customer data against potential theft and security breaches, such measures cannot provide absolute security. Moreover, as we outsource more of our information systems to vendors and rely more on cloud-based information systems, the related security risks will increase, and we will need to expend additional resources to protect our technology and information systems.

Business disruptions could seriously harm our future revenue and financial condition and increase our costs and expenses.

Our operations, and those of our CROs, CDMOs and other contractors and consultants, could be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, hurricanes, typhoons, fires, extreme weather conditions, medical epidemics and other natural or man-made disasters or business interruptions, for which we are predominantly self-insured. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and increase our costs and expenses. We rely on third-party manufacturers to produce and process our product candidates on a patient-by-patient basis. Our ability to obtain clinical supplies of our product candidates could be disrupted if the operations of these suppliers are affected by a man-made or natural disaster or other business interruption.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our product candidates.

We face an inherent risk of product liability as a result of the planned clinical testing of our product candidates and will face an even greater risk if we commercialize any products. For example, we may be sued if our product candidates cause or are perceived to cause injury or are found to be otherwise unsuitable during clinical testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted under state consumer protection acts. If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit commercialization of our product candidates. Even successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims may result in:

•decreased demand for our product candidates or products that we may develop;

•injury to our reputation;

•withdrawal of clinical trial participants;

•initiation of investigations by regulators;

•costs to defend the related litigation;

•a diversion of management’s time and our resources;

•substantial monetary awards to trial participants or patients;

•product recalls, withdrawals or labeling, marketing or promotional restrictions;

•loss of revenue;

•exhaustion of any available insurance and our capital resources; the inability to commercialize any product candidate; and

•a decline in our share price.

Failure to obtain or retain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or inhibit the commercialization of products we develop, alone or with corporate collaborators. Although we have clinical trial insurance, our insurance policies also have various exclusions, and we may be subject to a product liability claim for which we have no coverage. We may have to pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts. Even if our agreements with any future corporate collaborators entitle us to indemnification against losses, such indemnification may not be available or adequate should any claim arise.

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Unstable market and economic conditions may have serious adverse consequences on our business, financial condition and share price.

As widely reported, global credit and financial markets have experienced extreme volatility and disruptions in the past several years, including severely diminished liquidity and credit availability, declines in consumer confidence, declines in economic growth, increases in unemployment rates and uncertainty about economic stability. There can be no assurance that further deterioration in credit and financial markets and confidence in economic conditions will not occur. Our general business strategy may be adversely affected by any such economic downturn, volatile business environment or continued unpredictable and unstable market conditions. If the current equity and credit markets deteriorate, it may make any necessary debt or equity financing more difficult, more costly and more dilutive. Failure to secure any necessary financing in a timely manner and on favorable terms could have a material adverse effect on our growth strategy, financial performance and share price and could require us to delay or abandon clinical development plans.

These developments, or the perception that any of them could occur, have had and may continue to have a material adverse effect on global economic conditions and the stability of global financial markets, and may significantly reduce global market liquidity, restrict the ability of key market participants to operate in certain financial markets or restrict our access to capital. In addition, there is a risk that one or more of our current service providers, manufacturers and other partners may not survive an economic downturn, which could directly affect our ability to attain our operating goals on schedule and on budget. Any of these factors could have a material adverse effect on our business, financial condition and results of operations and reduce the price of our common shares.

Our business may be impacted by political events, war, terrorism, business interruptions and other geopolitical events and uncertainties beyond our control.

War, terrorism, geopolitical uncertainties and other business interruptions could cause damage to, disrupt or cancel the conduct of our clinical trials on a global or regional basis, which could have a material adverse effect on our business, clinical sites or vendors with which we do business. Such events could also decrease patient demand to enroll in our clinical trials or make it difficult or impossible for us to deliver products and services to our clinical investigational sites. In addition, territorial invasions can lead to cybersecurity attacks on companies, such as ours, located far outside of the conflict zone. In the event of prolonged business interruptions due to geopolitical events, we could incur significant losses, require substantial recovery time and experience significant expenditures in order to resume our business or clinical operations. We have no operations in Russia or Ukraine, but we do not and cannot know if the current uncertainties in these geopolitical areas, which are unfolding in real-time, may escalate and result in broad economic and security conditions or rationing of medical supplies, which could limit our ability to conduct clinical trials outside Canada and the U.S. or result in material implications for our business.

Global economic uncertainty and weakening product demand caused by political instability, changes in trade agreements and conflicts, such as the conflict between Russia and Ukraine, could adversely affect our business.

Political developments impacting government spending and international trade, including potential government shutdowns and trade disputes and tariffs, may negatively impact markets and cause weaker macro-economic conditions. The continuing effect of any or all of these events could adversely harm our operations and weaken our financial results.

Inflation could adversely affect our business, financial condition or results of operations.

Inflation rates across the globe have been rapidly increasing since 2021. Economists generally believe that this recent spike in the inflation rate has been driven by a number of factors including (among others) global supply chain issues, the increased cost of oil and other commodities, changes in consumer buying patterns during the COVID-19 pandemic and the massive influx of money into certain economies as a result of governmental rescue and stimulus programs implemented since the beginning of the COVID-19 pandemic. The current Russia-Ukraine conflict, which has resulted in increased energy prices and sanctions disrupting the normal patterns of global trade, has exacerbated inflationary conditions. To address recent high inflation rates, the Federal Reserve has announced several 0.5% and 0.75% increases to its benchmark interest rate and may approve additional rate increases in 2023. Such increases may be significant and likely spell the end, for the foreseeable future, of what has been a prolonged period of low interest rates.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Recent Sales of Unregistered Equity Securities

On May 10, 2023, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with the purchasers named therein (the “Investors”).

Pursuant to the Purchase Agreement, the Company agreed to sell an aggregate of 4,784,689 of its common shares (the “Shares”), no par value per share (the “Common Shares”), at a purchase price of $4.18 per share, to the Investors for approximately $20.0 million in aggregate gross proceeds (collectively, the “Offering”). The Offering is expected to close on or about May 15, 2023. The Company will pay expenses associated with the sale of these Shares.

On May 10, 2023, in connection with the Purchase Agreement, the Company entered into a Registration Rights Agreement (the “Registration Rights Agreement”), with the Investors. Pursuant to the Registration Rights Agreement, the Company agreed to prepare and file a registration statement with the SEC within 45 calendar days after the closing of the Offering for purposes of registering the resale of the Shares and any Common Shares as a dividend or other distribution with respect to the Shares. The Company agreed to use its commercially reasonable efforts to cause this registration statement to be declared effective by the SEC within 60 days after the filing of the registration statement.

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

None.

103

Item 6. Exhibits.

Exhibit Number	Description
10.1†*	Third Amendment to Loan and Security Agreement, dated as of March 30, 2023, by and between Oxford Finance LLC and the Company
10.2†	Option and Asset Purchase Agreement by and between the Company and RadioMedix, Inc., dated as of November 14, 2022 (filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K/A filed on February 14, 2023 (File No. 001-39344) and incorporated by reference herein)
10.3##	Securities Purchase Agreement, dated as of February 13, 2023, by and among the Company and the Investors named therein (filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K/A filed on February 14, 2023 (File No. 001-39344) and incorporated by reference herein)
10.4##	Registration Rights Agreement, dated as of February 13, 2023, by and among the Company and the Investors named therein (filed as Exhibit 10.3 to the Company’s Current Report on Form 8-K/A filed on February 14, 2023 (File No. 001-39344) and incorporated by reference herein)
31.1*	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1#	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2#	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	Inline XBRL Instance Document (the instance does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document)
101.SCH	Inline XBRL Taxonomy Extension Schema Document
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)

* Filed herewith.

† Portions of this exhibit (indicated by asterisks) have been redacted in compliance with Regulation S-K Item 601(b)(10)(iv).

# This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, except to the extent specifically incorporated by reference into such filing.

## The representations and warranties contained in this agreement were made only for purposes of the transactions contemplated by the agreement as of specific dates and may have been qualified by certain disclosures between the parties and a contractual standard of materiality different from those generally applicable under securities laws, among other limitations. The representations and warranties were made for purposes of allocating contractual risk between the parties to the agreement and should not be relied upon as a disclosure of factual information relating to the Company, the Investors or the transactions contemplated by the agreement.

104

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Fusion Pharmaceuticals Inc.
Date: May 11, 2023	By:	/s/ John Valliant
		John Valliant
		Chief Executive Officer
Date: May 11, 2023	By:	/s/ John Crowley
		John Crowley
		Chief Financial Officer

105

EX-10

Exhibit 10.1

CERTAIN CONFIDENTIAL PORTIONS OF THIS EXHIBIT HAVE BEEN OMITTED AND REPLACED WITH “[***]”. SUCH IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO THE COMPANY IF DISCLOSED.

THIRD AMENDMENT TO
LOAN AND SECURITY AGREEMENT

THIS THIRD AMENDMENT TO LOAN AND SECURITY AGREEMENT (this “Amendment”) is entered into as of March 30, 2023, by and among OXFORD FINANCE LLC, a Delaware limited liability company with an office located at 115 South Union Street, Suite 300, Alexandria, VA 22314, as collateral agent (in its individual capacity, “Oxford”; and in its capacity as collateral agent, “Collateral Agent”), the Lenders listed on Schedule 1.1 of the Loan Agreement (as defined below) or otherwise party thereto from time to time including Oxford in its capacity as a Lender, OXFORD FINANCE CREDIT FUND II, LP, by its manager Oxford Finance Advisors, LLC, with an office located at 115 South Union Street, Suite 300, Alexandria, VA 22314 (“OFCF II”), OXFORD FINANCE FUNDING IX, LLC, with an office locatedat 115 South Union Street, Suite 300, Alexandria, VA 22314 (“OFF IX”), OXFORD FINANCE FUNDING 2023-1, LLC, with an office locatedat 115 South Union Street, Suite 300, Alexandria, VA 22314 (“OFF 2023-1”), OXFORD FINANCE FUNDING XIII, LLC, with an office locatedat 115 South Union Street, Suite 300, Alexandria, VA 22314 (“OFF XIII”) (each a “Lender” and collectively, the “Lenders”), FUSION PHARMACEUTICALS INC., a corporation organized under the federal laws of Canada (“CAN Borrower”), with an office located at 270 Longwood Road South, Hamilton, Ontario, L8P 0A6, Canada, and FUSION PHARMACEUTICALS US INC., a Delaware corporation (“US Borrower” and together with CAN Borrower, individually and collectively as the context requires, jointly and severally, “Borrower”), with an office located at 2 International Place, Suite 2310, Boston, Massachusetts 02110.

Recitals

WHEREAS, Collateral Agent, Borrower and the Lenders party thereto from time to time have entered into that certain Loan and Security Agreement, dated as of April 4, 2022 (as amended, supplemented or otherwise modified from time to time, the “Loan Agreement”) pursuant to which the Lenders have provided to Borrower certain loans in accordance with the terms and conditions thereof;

WHEREAS, Borrower has requested that Collateral Agent and the Lenders make certain revisions to the Loan Agreement, but only to the extent, in accordance with the terms, subject to the conditions and in reliance upon the representations and warranties set forth below; and

WHEREAS, although the Lenders and Collateral Agent are under no obligation to do so, the Lenders and Collateral Agent have agreed to make certain revisions to the Loan Agreement, but only to the extent, in accordance with the terms, subject to the conditions and in reliance upon the representations and warranties set forth below;

Now, Therefore, in consideration of the promises, covenants and agreements contained herein, and other good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, Borrower, the Lenders and Collateral Agent hereby agree as follows:

1.Definitions. Capitalized terms used herein but not otherwise defined shall have the respective meanings given to them in the Loan Agreement.

2.Amendments.

2.1Section 10 of the Loan Agreement is hereby amended and restated in its entirety as follows:

10. NOTICES

All notices, consents, requests, approvals, demands, or other communication (collectively, “Communication”) by any party to this Agreement or any other Loan Document must be in writing and shall be deemed to have been validly served, given, or delivered: (a) upon the earlier of actual receipt and three (3) Business Days after deposit in the U.S. mail, first class, registered or certified mail return receipt requested, with proper postage prepaid; (b) upon transmission, when sent by electronic mail transmission; (c) one (1) Business Day after deposit with a reputable overnight courier with all charges prepaid; or (d) when delivered, if hand‑delivered by messenger, all of which shall be addressed to the party to be notified and sent to the address, or email address indicated below. Any of Collateral Agent, Lender or Borrower may change its mailing address, or email address by giving the other party written notice thereof in accordance with the terms of this Section 10.

If to Borrower:	c/o FUSION PHARMACEUTICALS INC. 270 Longwood Road South Hamilton, ON, L8P 0A6, Canada Attn: Corey Manchester and Maria Stahl Email: manchester@fusionpharma.com; stahl@fusionpharma.com
with a copy (which shall not constitute notice) to:	GOODWIN PROCTER LLP 100 Northern Avenue Boston, MA 02210 Attn: Anne Bandes Email: abandes@goodwinlaw.com
If to Collateral Agent: with a copy to:	OXFORD FINANCE LLC 115 South Union Street Suite 300 Alexandria, VA 22314 Attention: Legal Department Email: LegalDepartment@oxfordfinance.com OXFORD FINANCE CREDIT FUND II, LP c/o Oxford Finance Advisors, LLC, its manager 115 South Union Street Suite 300 Alexandria, VA 22314 Attention: Legal Department Fax: (703) 519-5225 Email: Legal Department@oxfordfinance.com
with a copy to:	OXFORD FINANCE FUNDING IX, LLC 115 South Union Street Suite 300 Alexandria, VA 22314

	Attention: Legal Department Fax: (703) 519-5225 Email: Legal Department@oxfordfinance.com
with a copy to:	OXFORD FINANCE FUNDING 2023-1, LLC 115 South Union Street Suite 300 Alexandria, VA 22314 Attention: Legal Department Fax: (703) 519-5225 Email: Legal Department@oxfordfinance.com
with a copy to:	OXFORD FINANCE FUNDING XIII, LLC 115 South Union Street Suite 300 Alexandria, VA 22314 Attention: Legal Department Fax: (703) 519-5225 Email: Legal Department@oxfordfinance.com
with a copy (which shall not constitute notice) to:	TROUTMAN PEPPER HAMILTON SANDERS LLP 401 9th Street, NW, Suite 1000 Washington, DC 20004 Attn: Charles Charpentier Email: charles.charpentier@troutman.com

2.2Section 13.1 of the Loan Agreement is hereby amended by amending and restating the following definition in its entirety as follows:

“Term C Draw Period” is the period commencing on the date that Borrower makes a public announcement that [***] is sufficient to continue the [***] prior to March 31, 2024 and ending on the earlier of (a) March 31, 2024, and (b) the occurrence and during the continuance of an Event of Default; provided, however, that the Term C Draw Period shall not commence if on the date of the occurrence of such public announcement an Event of Default has occurred and is continuing.

2.3Exhibit C of the Loan Agreement is hereby amended and restated in their entirety as set forth on Exhibit C attached hereto.

3.Limitation of Amendment.

3.1The amendments in Section 2 above are effective for the purposes set forth herein and shall be limited precisely as written and shall not be deemed to (a) be a consent to any amendment, waiver or modification of any other term or condition of any Loan Document, or (b) otherwise prejudice any right, remedy or obligation which Collateral Agent or any Lender or Borrower may now have or may have in the future under or in connection with any Loan Document, as amended hereby.

3.2This Amendment shall be construed in connection with and as part of the Loan Documents and all terms, conditions, representations, warranties, covenants and agreements set forth in the Loan Documents, except as herein amended, are hereby ratified and confirmed and shall remain in full force and effect.

4.Representations and Warranties. To induce Collateral Agent and the Lenders to enter into this Amendment, Borrower hereby represents and warrants to Collateral Agent and Lenders as follows:

4.1Immediately after giving effect to this Amendment (a) the representations and warranties contained in the Loan Documents are true, accurate and complete in all material respects as of the date hereof provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the text thereof; and provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date and (b) no Event of Default has occurred and is continuing;

4.2Borrower has the corporate power and due authority to execute and deliver this Amendment and to perform its obligations under the Loan Agreement, as amended by this Amendment;

4.3The organizational documents of Borrower delivered to Collateral Agent and the Lenders on the Effective Date, or subsequent thereto, remain true, accurate and complete and have not been amended, supplemented or restated and are and continue to be in full force and effect;

4.4The execution and delivery by Borrower of this Amendment and the performance by Borrower obligations under the Loan Agreement, as amended by this Amendment, have been duly authorized;

4.5The execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, do not (a) contravene, conflict with, constitute a default under or violate any material Requirement of Law applicable thereto, (b) contravene, conflict or violate any applicable order, writ, judgment, injunction, decree, determination or award of any Governmental Authority by which Borrower, or any of its property or assets may be bound or affected, (c) conflict with any of Borrower’s organizational documents, including their respective Operating Documents or (d) constitute an event of default under any material agreement by which Borrower, or its properties, are bound;

4.6The execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, do not require any action by, filing, registration, or qualification with, or Governmental Approval from, any Governmental Authority (except such Governmental Approvals which have already been obtained and are in full force and effect or are being obtained pursuant to Section 6.1(b) of the Loan Agreement), and

4.7This Amendment has been duly executed and delivered by Borrower and constitutes the binding obligation of Borrower, enforceable against Borrower in accordance with its terms, except as such enforceability may be limited by bankruptcy, insolvency, reorganization, liquidation, moratorium or other similar laws of general application and equitable principles relating to or affecting creditors’ rights.

5.Release by Borrower.

7.1 FOR GOOD AND VALUABLE CONSIDERATION, Borrower hereby forever relieves, releases, and discharges Collateral Agent and the Lenders and their respective present or former employees, officers, directors, agents, representatives, attorneys, and each of them, from any and all claims, debts, liabilities, demands, obligations, promises, acts, agreements, costs and expenses, actions and causes of action, of every type, kind, nature, description or character whatsoever, whether known or unknown, suspected or unsuspected, absolute or contingent, arising out of or in any manner whatsoever connected with or related to facts, circumstances, issues, controversies or claims existing or arising from the beginning

of time through and including the date of execution of this Amendment (collectively “Released Claims”). Without limiting the foregoing, the Released Claims shall include any and all liabilities or claims arising out of or in any manner whatsoever connected with or related to the Loan Documents, the Recitals hereto, any instruments, agreements or documents executed in connection with any of the foregoing or the origination, negotiation, administration, servicing and/or enforcement of any of the foregoing.

7.2 In furtherance of this release, Borrower expressly acknowledges and waives any and all rights under Section 1542 of the California Civil Code, which provides as follows:

“A general release does not extend to claims that the creditor or releasing party does not know or suspect to exist in his or her favor at the time of executing the release and that, if known by him or her, would have materially affected his or her settlement with the debtor or released party.” (Emphasis added.)

7.3 By entering into this release, Borrower recognizes that no facts or representations are ever absolutely certain and it may hereafter discover facts in addition to or different from those which it presently knows or believes to be true, but that it is the intention of Borrower hereby to fully, finally and forever settle and release all matters, disputes and differences, known or unknown, suspected or unsuspected; accordingly, if Borrower should subsequently discover that any fact that it relied upon in entering into this release was untrue, or that any understanding of the facts was incorrect, Borrower shall not be entitled to set aside this release by reason thereof, regardless of any claim of mistake of fact or law or any other circumstances whatsoever. Borrower acknowledges that it is not relying upon and has not relied upon any representation or statement made by Collateral Agent or any Lender with respect to the facts underlying this release or with regard to any of such party’s rights or asserted rights.

7.4 This release may be pleaded as a full and complete defense and/or as a cross-complaint or counterclaim against any action, suit, or other proceeding that may be instituted, prosecuted or attempted in breach of this release. Borrower acknowledges that the release contained herein constitutes a material inducement to Collateral Agent and the Lenders to enter into this Amendment, and that Collateral Agent and the Lenders would not have done so but for Collateral Agent’s and the Lenders’ expectation that such release is valid and enforceable in all events.

7.5 Borrower hereby represents and warrants to Collateral Agent and the Lenders, and Collateral Agent and the Lenders are relying thereon, as follows:

(a) Except as expressly stated in this Amendment, neither Collateral Agent, the Lenders nor any agent, employee or representative of Collateral Agent or any Lender has made any statement or representation to Borrower regarding any fact relied upon by Borrower in entering into this Amendment.

(b) Borrower has made such investigation of the facts pertaining to this Amendment and all of the matters appertaining thereto, as it deems necessary.

(c) The terms of this Amendment are contractual and not a mere recital.

(d) This Amendment has been carefully read by Borrower, the contents hereof are known and understood by Borrower, and this Amendment is signed freely, and without duress, by Borrower.

(e) Borrower represents and warrants that it is the sole and lawful owner of all right, title and interest in and to every claim and every other matter which it releases herein, and that it has not heretofore assigned or transferred, or purported to assign or transfer, to any person, firm or entity any claims

or other matters herein released. Borrower shall indemnify Collateral Agent and the Lenders, defend and hold them harmless from and against all claims based upon or arising in connection with prior assignments or purported assignments or transfers of any claims or matters released herein.

6.Counterparts. This Amendment may be executed in any number of counterparts and all of such counterparts taken together shall be deemed to constitute one and the same instrument.

7.Integration. Except as expressly set forth herein, the Loan Agreement shall continue in full force and effect without alteration or amendment. This Amendment and the Loan Documents represent the entire agreement about this subject matter and supersede prior negotiations or agreements.

8.Governing Law. This Amendment and the rights and obligations of the parties hereto shall be governed by and construed in accordance with the laws of the State of New York.

9.Effectiveness. This Amendment shall be deemed effective upon:

(i)the due execution and delivery to Collateral Agent and the Lenders of this Amendment by each party hereto;

(ii)Borrower’s payment of a fully-earned and non-refundable modification fee to Collateral Agent in an amount equal to $35,000; and

(iii)Borrower’s payment of all Lenders’ Expenses, including reasonable and documented attorney’s fees and out-of-pocket expenses, incurred through the date hereof, which may be debited (or ACH’d) from any of Borrower’s accounts with the Lenders.

[Balance of Page Intentionally Left Blank]

In Witness Whereof, the parties hereto have caused this Third Amendment to Loan and Security Agreement to be duly executed and delivered as of the date first set forth above.

BORROWER:

FUSION PHARMACEUTICALS INC.

By /s/ John Valliant

Name: John Valliant

Title: Chief Executive Officer

FUSION PHARMACEUTICALS US INC.

By /s/ John Valliant

Name: John Valliant

Title: President

COLLATERAL AGENT AND LENDER:

OXFORD FINANCE LLC

By /s/ Colette H. Featherly

Name: Colette H. Featherly

Title: Senior Vice President

LENDERS:

OXFORD FINANCE CREDIT FUND II, LP

By: Oxford Finance Advisors, LLC, its manager

By /s/ Colette H. Featherly

Name: Colette H. Featherly

Title: Senior Vice President

OXFORD FINANCE FUNDING IX, LLC

By /s/ Colette H. Featherly

Name: Colette H. Featherly

Title: Secretary

OXFORD FINANCE FUNDING 2023-1, LLC

By /s/ Colette H. Featherly

Name: Colette H. Featherly

Title: Secretary

OXFORD FINANCE FUNDING XIII, LLC

By /s/ Colette H. Featherly

Name: Colette H. Featherly

Title: Secretary

[Signature Page to Third Amendment to Loan and Security Agreement]

EXHIBIT C

Compliance Certificate

TO:	OXFORD FINANCE LLC, as Collateral Agent and Lender OXFORD FINANCE CREDIT FUND II, LP, as Lender OXFORD FINANCE FUNDING IX, LLC, as Lender OXFORD FINANCE FUNDING 2023-1, LLC, as Lender OXFORD FINANCE FUNDING XIII, LLC, as Lender
FROM:	FUSION PHARMACEUTICALS INC. FUSION PHARMACEUTICALS US INC.

The undersigned authorized officer (“Officer”) of each of FUSION PHARMACEUTICALS INC., and FUSION PHARMACEUTICALS US INC. (individually and collectively, “Borrower”), hereby certifies that in accordance with the terms and conditions of the Loan and Security Agreement by and among Borrower, Collateral Agent, and the Lenders from time to time party thereto (the “Loan Agreement;” capitalized terms used but not otherwise defined herein shall have the meanings given them in the Loan Agreement),

(a) Borrower is in complete compliance for the period ending _______________ with all required covenants except as noted below;

(b) There are no existing Events of Default, except as noted below;

(c) Except as noted below, all representations and warranties of Borrower stated in the Loan Documents are true and correct in all material respects on this date and for the period described in (a), above; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the text thereof; and provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date.

(d) Borrower, and each of Borrower’s Subsidiaries, has timely filed all required tax returns and reports, Borrower, and each of Borrower’s Subsidiaries, has timely paid all foreign, federal, state, provincial, municipal and local taxes, assessments, deposits and contributions owed by Borrower, or Subsidiary, except as otherwise permitted pursuant to the terms of Section 5.8 of the Loan Agreement;

(e) No Liens have been levied or claims made against Borrower or any of its Subsidiaries relating to unpaid employee payroll or benefits of which Borrower has not previously provided written notification to Collateral Agent and the Lenders.

Attached are the required documents, if any, supporting our certification(s). The Officer, on behalf of Borrower, further certifies that the attached financial statements are prepared in accordance with Generally Accepted Accounting Principles (GAAP) and are consistently applied from one period to the next except as explained in an accompanying letter or footnotes and except, in the case of unaudited financial statements, for the absence of footnotes and subject to year‑end audit adjustments as to the interim financial statements.

Please indicate compliance status since the last Compliance Certificate by circling Yes, No, or N/A under “Complies” column.

	Reporting Covenant	Requirement	Actual	Complies
1)	Financial statements	Monthly within 30 days		Yes	No	N/A
2)	Annual (CPA Audited) statements	Within 120 days after FYE		Yes	No	N/A

3)	Annual Financial Projections/Budget (prepared on a monthly basis)	Annually (within 60 days of FYE), and when revised		Yes	No	N/A
4)	A/R & A/P agings	If applicable		Yes	No	N/A
5)	8‑K, 10‑K and 10‑Q Filings	If applicable, within 5 days of filing		Yes	No	N/A
6)	Compliance Certificate	Monthly within 30 days		Yes	No	N/A
7)	IP Report	When required		Yes	No	N/A
8)	Total amount of Borrower’s cash and cash equivalents at the last day of the measurement period		$________	Yes	No	N/A
9)	Total amount of Borrower’s Subsidiaries’ cash and cash equivalents at the last day of the measurement period		$________	Yes	No	N/A
10)	Permitted Investments (Clause (e)): Up to CAD$5.5mm in 2022 and CAD$15mm, in aggregate, during loan term.		[See Attached Schedule I]	Yes	No	N/A
11)	Permitted Investments (Clause (f)): Up to $5mm in 2022 and $1mm in annual milestone payments (in aggregate)		[See Attached Schedule I]	Yes	No	N/A
12)	Permitted Investments (Clause (s)): Up to $5mm upfront and $1mm in annual milestone payments		[See Attached Schedule I]	Yes	No	N/A

Deposit and Securities Accounts

(Please list all accounts; attach separate sheet if additional space needed)

	Institution Name	Account Number	New Account?		Account Control Agreement in place?
1)			Yes	No	Yes	No
2)			Yes	No	Yes	No
3)			Yes	No	Yes	No
4)			Yes	No	Yes	No

Other Matters

1)	Have there been any changes in management since the last Compliance Certificate?	Yes	No
2)	Have there been any transfers/sales/disposals/retirement of Collateral or IP prohibited by the Loan Agreement?	Yes	No

3)	Have there been any new or pending claims or causes of action against Borrower that involve more than Two Hundred Fifty Thousand Dollars ($250,000)?	Yes	No
4)	Have there been any amendments of or other changes to the Operating Documents of Borrower or any of its Subsidiaries? If yes, provide copies of any such amendments or changes with this Compliance Certificate.	Yes	No

Exceptions

Please explain any exceptions with respect to the certification above: (If no exceptions exist, state “No exceptions.” Attach separate sheet if additional space needed.)

FUSION PHARMACEUTICALS INC.

By

Name:

Title:

FUSION PHARMACEUTICALS US INC.

By

Name:

Title:

Date:

LENDER USE ONLY
Received by:	Date:
Verified by:	Date:
Compliance Status: Yes No

SCHEDULE I

(Permitted Investments Schedule)

Permitted Investments Schedule	H1'22	H2'22	H1'23	H2'23	H1'24	H2'24	H1'25	H2'25
Investment in TRIUMF Innovations Inc. - Permitted Investments (e)  Up to CAD$5.5mm in 2022 and CAD$15mm, in aggregate, during loan term.
Investment Ac-225 unrelated to Canadian JV - Permitted Investments (f) Up to $5mm in 2022 and $1mm in annual milestone payments (in aggregate)
Investments in PSMA I&T associated assets - Permitted Investments (s) Up to $5mm upfront and $1mm in annual milestone payments

EX-31

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John Valliant, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Fusion Pharmaceuticals Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 11, 2023	By:	/s/ John Valliant
		John Valliant
		Chief Executive Officer

EX-31

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John Crowley, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Fusion Pharmaceuticals Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 11, 2023	By:	/s/ John Crowley
		John Crowley
		Chief Financial Officer

EX-32

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Fusion Pharmaceuticals Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, John Valliant, Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 11, 2023	By:	/s/ John Valliant
		John Valliant
		Chief Executive Officer

EX-32

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Fusion Pharmaceuticals Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, John Crowley, Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 11, 2023	By:	/s/ John Crowley
		John Crowley
		Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2023	May 02, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Trading Symbol	FUSN
Entity Registrant Name	Fusion Pharmaceuticals Inc.
Entity Central Index Key	0001805890
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		63,846,009
Entity Tax Identification Number	00-0000000
Entity File Number	001-39344
Entity Address, Address Line One	270 Longwood Rd., S.
Entity Address, City or Town	Hamilton
Entity Address, State or Province	ON
Entity Address, Country	CA
Entity Address, Postal Zip Code	L8P 0A6
City Area Code	289
Local Phone Number	799-0891
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	CA
Title of 12(b) Security	Common shares, no par value per share
Security Exchange Name	NASDAQ

XML

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 53,617	$ 43,861
Accounts receivable	89	61
Short-term investments	156,227	127,013
Prepaid expenses and other current assets	10,272	7,609
Restricted cash	419	454
Total current assets	220,624	178,998
Property and equipment, net	5,141	4,631
Deferred tax assets	5,300	4,806
Restricted cash	849	1,018
Long-term investments	11,338	15,761
Operating lease right-of-use assets	17,840	5,684
Other non-current assets	5,459	8,166
Total assets	266,551	219,064
Current liabilities:
Accounts payable	1,904	2,686
Accrued expenses and other current liabilities	10,353	10,605
Income taxes payable	97
Deferred revenue	333	333
Operating lease liabilities	4,638	1,443
Total current liabilities	17,325	15,067
Long-term debt, net of discount	34,360	34,233
Income taxes payable, net of current portion	299	299
Deferred revenue, net of current portion	2,667	2,667
Operating lease liabilities, net of current portion	11,067	4,577
Total liabilities	65,718	56,843
Commitments and contingencies (Note 15)
Shareholders’ equity:
Common shares, no par value, unlimited shares authorized as of March 31, 2023 and December 31, 2022; 63,201,559 and 44,805,627 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively
Additional paid-in capital	507,071	444,552
Accumulated other comprehensive loss	(85)	(469)
Accumulated deficit	(306,153)	(281,862)
Total shareholders' equity	200,833	162,221
Total liabilities and shareholders’ equity	$ 266,551	$ 219,064

XML

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Common stock, no par value	$ 0	$ 0
Common stock, shares issued	63,201,559	44,805,627
Common stock, shares outstanding	63,201,559	44,805,627

XML

Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Total revenue	$ 28	$ 585
Type of Revenue [Extensible List]	us-gaap:CollaborativeArrangementMember	us-gaap:CollaborativeArrangementMember
Operating expenses:
Research and development	$ 15,877	$ 12,661
General and administrative	9,006	8,449
Total operating expenses	24,883	21,110
Loss from operations	(24,855)	(20,525)
Other income (expense):
Interest income	1,921	83
Interest expense	(1,223)
Other (expense) income, net	(145)	478
Total other income, net	553	561
Loss before benefit for income taxes	(24,302)	(19,964)
Income tax benefit	11	55
Net loss	(24,291)	(19,909)
Unrealized gain (loss) on investments	384	(463)
Comprehensive loss	$ (23,907)	$ (20,372)
Net loss per share attributable to common shareholders-basic	$ (0.45)	$ (0.46)
Net loss per share attributable to common shareholders-diluted	$ (0.45)	$ (0.46)
Weighted-average common shares outstanding-basic	53,775,985	43,170,076
Weighted-average common shares outstanding-diluted	53,775,985	43,170,076

XML

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Private Placement [Member]	At-The-Market Offering [Member]	Common Shares [Member]	Common Shares [Member] Private Placement [Member]	Common Shares [Member] At-The-Market Offering [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Private Placement [Member]	Additional Paid-in Capital [Member] At-The-Market Offering [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2021	$ 231,456						$ 425,821			$ (194,250)	$ (115)
Beginning Balance (in shares) at Dec. 31, 2021				43,073,727
Issuance of common shares, net of issuance costs			$ 1,627						$ 1,627
Issuance of common shares, net of issuance costs (in shares)						222,726
Issuance of common shares upon exercise of stock options	82						82
Issuance of common shares upon exercise of stock options (in shares)				34,685
Share-based compensation expense	2,633						2,633
Unrealized gain (loss) on investments	(463)										(463)
Net loss	(19,909)									(19,909)
Ending Balance at Mar. 31, 2022	215,426						430,163			(214,159)	(578)
Ending Balance (in shares) at Mar. 31, 2022				43,331,138
Beginning Balance at Dec. 31, 2022	$ 162,221			$ 444,552						(281,862)	(469)
Beginning Balance (in shares) at Dec. 31, 2022				44,805,627
Issuance of common shares, net of issuance costs		$ 56,003	$ 3,367					$ 56,003	$ 3,367
Issuance of common shares, net of issuance costs (in shares)					17,648,596	747,336
Issuance of common shares upon exercise of stock options (in shares)	0
Share-based compensation expense	$ 3,149						3,149
Unrealized gain (loss) on investments	384										384
Net loss	(24,291)									(24,291)
Ending Balance at Mar. 31, 2023	$ 200,833						$ 507,071			$ (306,153)	$ (85)
Ending Balance (in shares) at Mar. 31, 2023				63,201,559

XML

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (24,291)	$ (19,909)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	3,149	2,633
Depreciation and amortization expense	273	203
Non-cash lease expense	405	281
Non-cash interest expense	127
(Accretion) amortization of (discounts) premiums on investments, net	(1,101)	188
Deferred tax benefit	(494)	(340)
Other	(1)	26
Changes in operating assets and liabilities:
Accounts receivable	(28)	31
Prepaid expenses and other current assets	(2,663)	2,731
Operating lease right-of-use assets		182
Other non-current assets	177	(75)
Accounts payable	(704)	(563)
Accrued expenses and other current liabilities	(35)	355
Deferred revenue		(438)
Income taxes payable	97
Operating lease liabilities	(346)	(276)
Net cash used in operating activities	(25,435)	(14,971)
Cash flows from investing activities:
Purchases of investments	(62,422)	(17,330)
Maturities of investments	39,117	37,056
Purchases of property and equipment	(1,223)	(595)
Net cash (used in) provided by investing activities	(24,528)	19,131
Cash flows from financing activities:
Proceeds from issuance of common shares from private placement	60,005
Proceeds from issuance of common shares from at-the-market offering, net of issuance costs	3,367	1,627
Payment of offering costs	(3,857)
Proceeds from issuance of common shares upon exercise of stock options		82
Net cash provided by financing activities	59,515	1,709
Net increase in cash, cash equivalents and restricted cash	9,552	5,869
Cash, cash equivalents and restricted cash at beginning of period	45,333	54,789
Cash, cash equivalents and restricted cash at end of period	54,885	60,658
Supplemental disclosure of cash flow information:
Cash paid for interest	1,096
Right-of-use assets obtained in exchange for new operating lease liabilities	12,560	339
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued expenses	169	217
Common share issuance costs included in accounts payable and accrued expenses	$ 145
Debt issuance costs included in accounts payable and accrued expenses		$ 60

XML

Nature of the Business and Basis of Presentation

3 Months Ended

Mar. 31, 2023

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of the Business and Basis of Presentation

1.Nature of the Business and Basis of Presentation

Fusion Pharmaceuticals Inc., together with its consolidated subsidiary (“Fusion” or the “Company”), is a clinical-stage oncology company focused on developing next-generation radiopharmaceuticals as precision medicines. The Company was formed and subsequently incorporated as Fusion Pharmaceuticals Inc. in December 2014 under the Canada Business Corporations Act. The Company was founded to advance certain intellectual property relating to radiopharmaceuticals that had been developed by the Centre for Probe Development and Commercialization, a radiopharmaceutical research and good manufacturing practice production center. The Company is headquartered in Hamilton, Ontario.

The Company is subject to risks and uncertainties common to early-stage companies in the biotechnology industry, including, but not limited to, successful discovery and development of its product candidates, development by competitors of new technological innovations, dependence on key personnel, the ability to attract and retain qualified employees, protection of proprietary technology, compliance with governmental regulations, the impact of the COVID-19 pandemic and overall market conditions, the ability to secure additional capital to fund operations and commercial success of its product candidates. Product candidates currently under development will require extensive preclinical and clinical testing and regulatory approval prior to commercialization. These efforts require significant amounts of additional capital, adequate personnel, and infrastructure and extensive compliance-reporting capabilities. Even if the Company’s drug development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales.

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of the Company and its wholly-owned subsidiary, Fusion Pharmaceuticals US Inc. All intercompany accounts and transactions have been eliminated in consolidation.

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the ordinary course of business. Since inception, the Company has funded its operations primarily with proceeds from sales of its convertible preferred shares, including borrowings under a convertible promissory note, which converted into convertible preferred shares, proceeds from sales of its former Irish subsidiary’s preferred exchangeable shares, proceeds from its initial public offering completed in June 2020, proceeds from its “at-the-market” equity offering program (see Note 9), proceeds from its loan and security agreement with Oxford Finance LLC executed in April 2022 (see Note 8), and proceeds from a private placement financing completed in February 2023 (see Note 9). The Company has incurred recurring losses since its inception, including net losses of $24.3 million and $19.9 million for the three months ended March 31, 2023 and 2022, respectively. In addition, as of March 31, 2023, the Company had an accumulated deficit of $306.2 million. The Company expects to continue to generate operating losses for the foreseeable future. As of the issuance date of these condensed consolidated financial statements, the Company expects that its cash, cash equivalents and investments will be sufficient to fund its operating expenses and capital expenditure requirements for at least the next 12 months. The future viability of the Company is dependent on its ability to raise additional capital to finance its operations.

Impacts of COVID-19 and Market Conditions on Our Business

The Company believes its financial results for the three months ended March 31, 2023 and year ended December 31, 2022 were not significantly impacted by the COVID-19 pandemic. The Company believes its hybrid and remote working arrangements have had limited impact on its ability to maintain internal operations during the three months ended March 31, 2023 and year ended December 31, 2022. Further, disruption of global financial markets and a recession or market correction, including as a result of the COVID-19 pandemic, the ongoing military conflict between Russia and Ukraine and the related sanctions imposed against Russia, and other global macroeconomic factors such as inflation and the recent banking industry volatility, could reduce the Company’s ability to access capital, which could, in the future, negatively affect its business and the value of its common shares.

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2.Summary of Significant Accounting Policies

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and

liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the accrual of research and development expenses, valuations of share-based awards, valuation allowance of deferred tax assets, and revenue recognition. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates when there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results may differ from those estimates or assumptions.

Unaudited Interim Financial Information

The accompanying condensed consolidated balance sheet as of March 31, 2023, the condensed consolidated statement of operations and comprehensive loss, and the condensed consolidated statement of shareholders’ equity, and the condensed consolidated statement of cash flows for the three months ended March 31, 2023 and 2022 are unaudited. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of March 31, 2023 and the results of its operations and its cash flows for the three months ended March 31, 2023 and 2022. The results for the three months ended March 31, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.

The accompanying balance sheet as of December 31, 2022 has been derived from the Company’s audited financial statements for the year ended December 31, 2022. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited interim condensed consolidated financial statements should be read in conjunction with the audited annual consolidated financial statements as of December 31, 2022, and notes thereto, which are included in the Company’s Annual Report on Form 10-K that was filed with the SEC on March 16, 2023.

Foreign Currency and Currency Translation

The reporting currency of the Company is the U.S. dollar. The functional currency of the Company’s operating company in Canada and operating company in the U.S. is also the U.S. dollar. As a result, the Company records no cumulative translation adjustments related to translation of unrealized foreign exchange gains or losses.

For the remeasurement of local currencies to the U.S. dollar functional currency of the Canadian entity, assets and liabilities are translated into U.S. dollars at the exchange rate in effect on the balance sheet date, and income items and expenses are translated into U.S. dollars at the average exchange rate in effect during the period. Resulting transaction gains (losses) are included in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss, as incurred.

Adjustments that arise from exchange rate changes on transactions denominated in a currency other than the local currency are included in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss, as incurred.

During the three months ended March 31, 2023 and 2022, the Company recorded $(0.3) million and $0.3 million, respectively, of foreign currency (losses) gains in the condensed consolidated statements of operations and comprehensive loss.

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents consist of standard checking accounts, money market accounts, and all highly liquid investments with an original maturity of three months or less at the date of purchase.

As of March 31, 2023 and December 31, 2022, the Company was required to maintain a separate cash balance of $0.2 million to collateralize corporate credit cards with a bank, which was classified as restricted cash, current, on its condensed consolidated balance sheets. The Company also maintained a $0.1 million guaranteed investment certificate to fulfill certain contractual obligations which was classified as restricted cash, current, as of March 31, 2023 and December 31, 2022.

In connection with the Company’s lease agreement entered into in October 2019 (see Note 14), the Company maintained a letter of credit of $1.5 million for the benefit of the landlord, which was reduced to $1.0 million during the three months ended March 31, 2023. As of March 31, 2023, $0.2 million and $0.8 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash. As of December 31, 2022, $0.2 million and $1.0 million of the underlying cash balance

collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash.

As of March 31, 2023 and December 31, 2022, the cash, cash equivalents and restricted cash of $54.9 million and $45.3 million, respectively, presented in the condensed consolidated statements of cash flows included cash and cash equivalents of $53.6 million and $43.9 million, respectively, and restricted cash of $1.3 million and $1.5 million, respectively.

Investments

The Company adopted ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”) effective January 1, 2023, and the adoption did not have a material impact on its condensed consolidated financial statements.

The Company determines the appropriate classification of its investments in debt securities at the time of purchase and re-evaluates such determination at each balance sheet date. The Company classifies its investments as current or non-current based on each instrument’s underlying maturity date. Investments with original maturities of greater than three months and remaining maturities less than twelve months are classified as current and are included in short-term investments in the condensed consolidated balance sheets. Investments with remaining maturities greater than one year from the balance sheet date are classified as non-current and are included in long-term investments in the condensed consolidated balance sheets. The Company’s investments are classified as available-for-sale, are reported at fair value and consist of U.S. and Canadian government agency debt securities, corporate bonds, and commercial paper. Unrealized gains and losses are included in other comprehensive (loss) income as a component of shareholders’ equity until realized. Amortization and accretion of premiums and discounts are recorded in interest income. Realized gains and losses on debt securities are included in other (expense) income, net.

The Company reviews its portfolio of available-for-sale debt securities, using both quantitative and qualitative factors, to determine if declines in fair value below cost have resulted from a credit-related loss or other factors. If the decline in fair value is due to credit-related factors, a loss is recognized in net loss, and if the decline in fair value is not due to credit-related factors, the loss is recorded in other comprehensive loss. No credit losses were recorded during the periods presented.

Deferred Offering Costs

The Company capitalizes certain legal, professional accounting and other third-party fees that are directly associated with in-process equity financings as deferred offering costs until such financings are consummated. After consummation of an equity financing, these costs are recorded as a reduction of the proceeds from the offering in shareholders’ equity as a reduction of additional paid-in capital generated as a result of the offering. Should an in-process equity financing be abandoned, the deferred offering costs would be expensed immediately as a charge to operating expenses in the condensed consolidated statements of operations and comprehensive loss. The Company recorded $0.2 million of deferred offering costs as of March 31, 2023 and December 31, 2022 in other non-current assets.

Collaborative Arrangements

The Company considers the nature and contractual terms of arrangements and assesses whether an arrangement involves a joint operating activity pursuant to which the Company is an active participant and is exposed to significant risks and rewards dependent on the commercial success of the activity. If the Company is an active participant and is exposed to significant risks and rewards dependent on the commercial success of the activity, the Company accounts for such arrangement as a collaborative arrangement under ASC 808, Collaborative Arrangements. ASC 808 describes arrangements within its scope and considerations surrounding presentation and disclosure, with recognition matters subjected to other authoritative guidance, in certain cases by analogy.

For arrangements determined to be within the scope of ASC 808 where a collaborative partner is not a customer for certain research and development activities, the Company accounts for payments received for the reimbursement of research and development costs as a contra-expense in the period such expenses are incurred. This reflects the joint risk sharing nature of these activities within a collaborative arrangement. The Company classifies payments owed or receivables recorded as other current liabilities or prepaid expenses and other current assets, respectively, in the Company’s consolidated balance sheets.

If payments from the collaborative partner to the Company represent consideration from a customer in exchange for distinct goods and services provided, then the Company accounts for those payments within the scope of ASC 606, Revenue from Contracts with Customers (“ASC 606”). Please refer to Note 3, “Collaboration Agreement” for additional details regarding the Company’s Strategic Collaboration Agreement with AstraZeneca UK Limited (“AstraZeneca”) (the “AstraZeneca Agreement”).

Revenue from Contracts with Customers

In accordance with ASC 606, the Company recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the Company expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that the Company determines are within the scope of ASC 606, it performs the following five steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations within the contract and (v) recognize revenue when (or as) the Company satisfies a performance obligation.

The Company only applies the five-step model to contracts when it determines that it is probable it will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer.

At contract inception, once the contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within the contract to determine whether each promised good or service is a performance obligation. The promised goods or services in the Company’s arrangements typically consist of a license to the Company’s intellectual property and/or research and development services. The Company may provide customers with options to additional items in such arrangements, which are accounted for separately when the customer elects to exercise such options, unless the option provides a material right to the customer. Performance obligations are promises in a contract to transfer a distinct good or service to the customer that (i) the customer can benefit from on its own or together with other readily available resources, and (ii) is separately identifiable from other promises in the contract. Goods or services that are not individually distinct performance obligations are combined with other promised goods or services until such combined group of promises meet the requirements of a performance obligation.

The Company determines transaction price based on the amount of consideration the Company expects to receive for transferring the promised goods or services in the contract. Consideration may be fixed, variable, or a combination of both. At contract inception for arrangements that include variable consideration, the Company estimates the probability and extent of consideration it expects to receive under the contract utilizing either the most likely amount method or expected amount method, whichever best estimates the amount expected to be received. The Company then considers any constraints on the variable consideration and includes in the transaction price variable consideration to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved.

The Company then allocates the transaction price to each performance obligation based on the relative standalone selling price and recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) control is transferred to the customer and the performance obligation is satisfied. For performance obligations which consist of licenses and other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

The Company records amounts as accounts receivable when the right to consideration is deemed unconditional. Amounts received, or that are unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract are recognized as deferred revenue. Amounts expected to be recognized as revenue within the 12 months following the balance sheet date are classified as the current portion of deferred revenue. Amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as deferred revenue, net of current portion.

The Company’s revenue generating arrangements typically include upfront license fees, milestone payments and/or royalties.

If a license is determined to be distinct from the other performance obligations identified in the arrangement, the Company recognizes revenue from nonrefundable, up-front fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. For licenses that are bundled with other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

At the inception of an agreement that includes research and development milestone payments, the Company evaluates each milestone to determine when and how much of the milestone to include in the transaction price. The Company first estimates the amount of the milestone payment that the Company could receive using either the expected value or the most likely amount approach. The Company primarily uses the most likely amount approach as this approach is generally most predictive for milestone payments with a binary outcome. Then, the Company considers whether any portion of the estimated amount is subject to the variable consideration constraint (that is, whether it is probable that a significant reversal of cumulative revenue would not occur upon resolution of the uncertainty). The Company updates the estimate of variable consideration included in the transaction price at each reporting date which

includes updating the assessment of the likely amount of consideration and the application of the constraint to reflect current facts and circumstances.

For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company will recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied).

For the three months ended March 31, 2023 and 2022, the Company recorded less than $0.1 million and $0.6 million, respectively, of revenue under collaboration agreements. Please refer to Note 3, “Collaboration Agreement” for additional details regarding revenue recognition under the AstraZeneca Agreement.

Business Combinations

In determining whether an acquisition should be accounted for as a business combination or asset acquisition, the Company first determines whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this is the case, the single identifiable asset or the group of similar assets is not deemed to be a business, and is instead deemed to be an asset. If this is not the case, the Company then further evaluates whether the single identifiable asset or group of similar identifiable assets and activities includes, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. If so, the Company concludes that the single identifiable asset or group of similar identifiable assets and activities is a business.

The Company accounts for business combinations using the acquisition method of accounting. Application of this method of accounting requires that (i) identifiable assets acquired (including identifiable intangible assets) and liabilities assumed generally be measured and recognized at fair value as of the acquisition date and (ii) the excess of the purchase price over the net fair value of identifiable assets acquired and liabilities assumed be recognized as goodwill, which is not amortized for accounting purposes but is subject to testing for impairment at least annually. Acquired in-process research and development (“IPR&D”) is recognized at fair value and initially characterized as an indefinite-lived intangible asset, irrespective of whether the acquired IPR&D has an alternative future use. Transaction costs related to business combinations are expensed as incurred. Determining the fair value of assets acquired and liabilities assumed in a business combination requires management to use significant judgment and estimates, especially with respect to intangible assets.

During the measurement period, which extends no later than one year from the acquisition date, the Company may record certain adjustments to the carrying value of the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, all adjustments are recorded in the consolidated statements of operations as operating expenses or income.

To date, the Company has not recorded any acquisitions as a business combination.

Asset Acquisitions

The Company measures and recognizes asset acquisitions that are not deemed to be business combinations based on the cost to acquire the assets, which includes transaction costs. Goodwill is not recognized in asset acquisitions. In an asset acquisition, the cost allocated to acquire IPR&D with no alternative future use is charged to expense at the acquisition date.

Contingent consideration in asset acquisitions payable in the form of cash is recognized when payment becomes probable and reasonably estimable, unless the contingent consideration meets the definition of a derivative, in which case the amount becomes part of the asset acquisition cost when acquired. Contingent consideration payable in the form of a fixed number of the Company’s own shares is measured at fair value as of the acquisition date and recognized when the issuance of the shares becomes probable. Upon recognition of the contingent consideration payment, the amount is included in the cost of the acquired asset or group of assets, or, if related to IPR&D with no alternative future use, charged to expense.

Fair Value Measurements

Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried

at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable:

•Level 1—Quoted prices in active markets for identical assets or liabilities.

•Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data.

•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

The Company’s cash equivalents and investments are carried at fair value, determined according to the fair value hierarchy described above (see Note 4). The carrying values of the Company’s amounts due for Canadian harmonized sales tax, accounts payable and accrued expenses approximate their fair values due to the short-term nature of these liabilities.

Leases

The Company accounts for leases in accordance with ASC 842, Leases. At contract inception, the Company determines if an arrangement is or contains a lease. A lease conveys the right to control the use of an identified asset for a period of time in exchange for consideration. If determined to be or contain a lease, the lease is assessed for classification as either an operating or finance lease at the lease commencement date, defined as the date on which the leased asset is made available for use by the Company, based on the economic characteristics of the lease. For each lease with a term greater than twelve months, the Company records a right-of-use asset and lease liability.

A right-of-use asset represents the economic benefit conveyed to the Company by the right to use the underlying asset over the lease term. A lease liability represents the obligation to make lease payments arising from the lease. The Company records amortization of operating right-of-use assets and accretion of lease liabilities as a single lease cost on a straight-line basis over the lease term. The Company elected the practical expedient to not separate lease and non-lease components and therefore measures each lease payment as the total of the fixed lease and associated non-lease components. Lease liabilities are measured at the lease commencement date and calculated as the present value of the future lease payments in the contract using the rate implicit in the contract, when available. If an implicit rate is not readily determinable, the Company uses its incremental borrowing rate measured as the rate at which the Company could borrow, on a fully collateralized basis, a commensurate loan in the same currency over a period consistent with the lease term at the commencement date. Right-of-use assets are measured as the lease liability plus initial direct costs and prepaid lease payments, less lease incentives granted by the lessor. The lease term is measured as the noncancelable period in the contract, adjusted for any options to extend or terminate when it is reasonably certain the Company will extend the lease term via such options based on an assessment of economic factors present as of the lease commencement date. The Company elected the practical expedient to not recognize leases with a lease term of twelve months or less.

The Company assesses its right-of-use assets for impairment consistent with the assessment performed for long-lived assets used in operations. If an impairment is recognized on operating lease right-of-use assets, the lease liability continues to be recognized using the same effective interest method as before the impairment and the operating lease right-of-use asset is amortized over the remaining term of the lease on a straight-line basis.

The Company’s operating leases are presented in the condensed consolidated balance sheet as operating lease right-of-use assets, classified as noncurrent assets, and operating lease liabilities, classified as current and noncurrent liabilities based on the discounted lease payments to be made within the proceeding twelve months. Variable costs associated with a lease, such as maintenance and utilities, are not included in the measurement of the lease liabilities and right-of-use assets but rather are expensed when the events determining the amount of variable consideration to be paid have occurred.

Research, Development and Manufacturing Contract Costs and Accruals

The Company has entered into various research, development and manufacturing contracts with research institutions and other companies. These agreements are generally cancelable, and related costs are recorded as research and development expenses as incurred. The Company records accruals for estimated ongoing research, development and manufacturing costs. When billing terms under these contracts do not coincide with the timing of when the work is performed, the Company is required to make estimates of outstanding obligations to those third parties as of period end. Any accrual estimates are based on a number of factors, including the Company’s knowledge of the progress towards completion of the research, development and manufacturing activities, invoicing to date under the contracts, communication from the research institutions and other companies of any actual costs incurred during the period that have not yet been invoiced and the costs included in the contracts. Significant judgments and estimates may be made in determining the

accrued balances at the end of any reporting period. Actual results could differ from the estimates made by the Company. The historical accrual estimates made by the Company have not been materially different from the actual costs.

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in shareholders’ equity that result from transactions and economic events other than those with shareholders. For the three months ended March 31, 2023 and 2022, unrealized gains and losses on investments are included in other comprehensive (loss) income as a component of shareholders’ equity until realized.

Net Loss per Share

Basic net income (loss) per share attributable to common shareholders is computed by dividing the net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted net income (loss) attributable to common shareholders is computed by adjusting net income (loss) attributable to common shareholders to reallocate undistributed earnings based on the potential impact of dilutive securities. Diluted net income (loss) per share attributable to common shareholders is computed by dividing the diluted net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period, including potential dilutive common shares. For purpose of this calculation, outstanding stock options, restricted stock units and warrants are considered potential dilutive common shares.

Recently Adopted Accounting Pronouncements

The Company qualifies as “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected to “opt in” to the extended transition related to complying with new or revised accounting standards, which means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company will adopt the new or revised standard at the time nonpublic companies adopt the new or revised standard and will do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for private companies.

In June 2016, the FASB issued ASU 2016-13 which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with an expected loss model. It also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. In November 2018, the FASB issued ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, which narrowed the scope and changed the effective date for non-public entities for ASU 2016-13. The FASB subsequently issued supplemental guidance within ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief (“ASU 2019-05”). ASU 2019-05 provides an option to irrevocably elect the fair value option for certain financial assets previously measured at amortized cost basis. This guidance is effective for the Company for annual periods beginning after December 15, 2022, including interim periods within that fiscal year. The Company adopted ASU 2016-13 effective January 1, 2023, and the adoption did not have a material impact on its condensed consolidated financial statements.

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Collaboration Agreement

3 Months Ended

Mar. 31, 2023

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Collaboration Agreement

3.Collaboration Agreement

Strategic Collaboration Agreement with AstraZeneca UK Limited

In October 2020, the Company and AstraZeneca entered into the AstraZeneca Agreement pursuant to which the Company and AstraZeneca will work to jointly discover, develop and commercialize next-generation alpha-emitting radiopharmaceuticals and combination therapies for the treatment of cancer globally by leveraging the Company’s Targeted Alpha Therapies (“TATs”) platform and expertise in radiopharmaceuticals with AstraZeneca’s leading portfolio of antibodies and cancer therapeutics, including DNA damage response inhibitors (“DDRis”). Each party retains full ownership over its existing assets.

The AstraZeneca Agreement consists of two distinct collaboration programs: novel TATs and combination therapies. Under the AstraZeneca Agreement, the parties may develop up to three novel TATs (the “Novel TATs Collaboration”). The parties will also evaluate up to five potential combination strategies involving the Company’s existing assets, including the Company’s lead candidate FPI-1434, in combination with certain of AstraZeneca’s existing therapeutics for the treatment of various cancers (the “Combination Therapies Collaboration”).

The AstraZeneca Agreement expires on a TAT-by-TAT and combination-by-combination basis upon the later of the expiration of development and exclusivity obligations relating to such TAT or combination or, if such TAT or combination is commercialized as a product under the AstraZeneca Agreement, the expiration of the commercial life of such product. The Company and AstraZeneca can each terminate the AstraZeneca Agreement for the other party’s uncured material breach following the applicable notice period. Each of the Company and AstraZeneca may also terminate the AstraZeneca Agreement with respect to any TAT or combination product if such party determines that the continued development of such TAT or combination product is not commercially viable, or for a material safety issue with respect to such TAT or combination product.

Novel TATs Collaboration

As part of the Novel TATs Collaboration, the parties may develop up to three novel TATs. The Company and AstraZeneca will share development costs equally (with each party responsible for the cost of its own supply in connection with such development). Either party has the right to opt out of the co-development and co-commercialization arrangement at pre-determined timepoints and obtain exclusive rights to a novel TAT in exchange for milestone payments to the other party of up to $145.0 million per novel TAT and a low or high single-digit royalties on future sales (depending on the opt out time point). If neither party opts out, and unless otherwise agreed by the parties, AstraZeneca will lead worldwide commercialization activities for the novel TATs, subject to the Company’s option to co-promote the TATs in the U.S. All profits and losses resulting from such commercialization activities will be shared equally. In January 2022, the Company announced the nomination of the first novel TAT candidate under the Novel TATs Collaboration, which the Company refers to as FPI-2068. FPI-2068 is a TAT designed to deliver 225Ac to various solid tumors that express epidermal growth factor receptor (“EGFR”) and mesenchymal epithelial transition factor (“cMET”). In April 2023, the Company announced the clearance of investigational new drug applications (“INDs”) for FPI-2068 and its corresponding imaging analogue, FPI-2107, by the FDA.

The Novel TATs Collaboration is within the scope of ASC 808 as the Company and AstraZeneca are both active participants in the research and development activities and are exposed to significant risks and rewards that are dependent on commercial success of the activities of the arrangement. The research and development activities are a unit of account under the scope of ASC 808 and are not promises to a customer under the scope of ASC 606.

The Company records its portion of the research and development expenses as the related expenses are incurred. All payments received or amounts due from AstraZeneca for reimbursement of shared costs are accounted for as an offset to research and development expense. For the three months ended March 31, 2023 and 2022, the Company incurred $1.6 million and $0.7 million, respectively, in research and development expenses relating to the Novel TATs Collaboration which was offset by $0.6 million and $0.3 million, respectively, in amounts due from AstraZeneca for reimbursement of shared costs. As of March 31, 2023 and December 31, 2022, the Company recorded $0.9 million and $0.4 million, respectively, due from AstraZeneca for reimbursement of shared costs in prepaid expenses and other current assets.

Combination Therapies Collaboration

As part of the Combination Therapies Collaboration, the parties will evaluate up to five potential combination strategies involving the Company’s existing assets, including the Company’s lead candidate FPI-1434, in combination with certain of AstraZeneca’s existing therapeutics for the treatment of various cancers. The Company received an upfront payment of $5.0 million from AstraZeneca in December 2020 associated with the Combination Therapies Collaboration. AstraZeneca will fully fund all research and development activities for the combination strategies, until such point as the Company may opt-in to the clinical development activities.

The Company also has the right to opt-out of clinical development activities relating to these combination therapies. In such instance, the Company will be responsible for repaying its share of the development costs via a royalty on the additional combination sales only if its drug is approved on the basis of clinical development solely conducted by AstraZeneca, in which case the royalty payments shall also include a variable risk premium based on the number of the Company’s product candidates to have received regulatory approval at that time.

Each party will have the sole right, on a country-by-country basis, to commercialize its respective contributed compound as a component of any combination therapy for which such party’s contributed compound may be commercialized under a separate marketing authorization from the other party’s contributed compound to such combination therapy. The parties will negotiate in good faith on a combination therapy-by-combination therapy basis the terms and conditions to co-commercialize any combination therapy

that is to be commercialized under a single marketing authorization. During the period of time commencing with the inclusion of an available molecular target in the selection pool for development as a combination therapy and ending upon the end of the nomination period or earlier removal of such combination target from such pool, the Company will not undertake any preclinical or clinical studies combining the Company’s TAT platform with any compound modulating the activity of such combination target. Following selection of a target under the AstraZeneca Agreement and payment of an exclusivity fee by AstraZeneca, and provided that AstraZeneca enrolls its first patient in a clinical trial as further defined in the AstraZeneca Agreement within a pre-defined period of time of such selection, the Company will not undertake any preclinical or clinical studies combining the Company’s TAT platform with compounds modulating the same combination target for the duration of the evaluation period for such combination target, as further defined in the AstraZeneca Agreement. Within a certain time period following initiation of the evaluation period with respect to a combination target, AstraZeneca has the exclusive right to undertake, alone or in collaboration with the Company, all further clinical or preclinical combination studies with respect to a combination target by paying certain exclusivity fees. The Company is eligible to receive future payments of up to $40.0 million, including those for the achievement of certain clinical milestones and exclusivity fees.

The Company determined the research and development activities associated with the Combination Therapies Collaboration are a key component of its central operations and AstraZeneca has contracted with the Company to obtain goods and services which are an output of the Company’s ordinary activities in exchange for consideration. Further, the Company does not share the risks and rewards of the underlying research activities making AstraZeneca a customer for the Combination Therapies Collaboration which falls within the scope of ASC 606.

To determine the appropriate amount of revenue to be recognized under ASC 606, the Company performed the following steps: (i) identify the promised goods or services in the contract, (ii) determine whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract, (iii) measure the transaction price, including the constraint on variable consideration, (iv) allocate the transaction price to the performance obligations and (v) recognize revenue when (or as) the Company satisfies each performance obligation.

Under ASC 606 the Company accounts for (i) the license it conveyed to AstraZeneca with respect to certain intellectual property and (ii) the obligations to perform research and development services as part of the Combination Therapies Collaboration as a single performance obligation under the AstraZeneca Agreement. The Company concluded AstraZeneca’s right to purchase exclusive options to obtain certain development, manufacturing and commercialization rights represent customer options that are not performance obligations as they do not contain any discounts or other rights that would be considered a material right in the arrangement. Such options will be accounted for upon AstraZeneca’s election.

The Company determined the transaction price under ASC 606 at the inception of the AstraZeneca Agreement to be the $5.0 million upfront payment. The cost reimbursement payments for all costs incurred by the Company under the Combination Therapies Collaboration represent variable consideration that is not constrained. Additionally, the clinical milestone payments represent variable consideration that is constrained. In making this assessment, the Company considered several factors, including the fact that achievement of the milestones are outside its control and contingent upon the future success of clinical trials and AstraZeneca’s actions. The payments related to the achievement of certain clinical milestones do not relate to separate, distinct performance obligations.

Under ASC 606, the Company recognizes revenue using the cost-to-cost method, which it believes best depicts the transfer of control to the customer. Under the cost-to-cost method, the extent of progress towards completion is measured based on the ratio of actual costs incurred to the total estimated costs expected upon satisfying the identified performance obligation. Under this method, revenue is recorded as a percentage of the estimated transaction price based on the extent of progress towards completion. Under ASC 606, the estimated transaction price includes variable consideration that is not constrained. The Company does not include variable consideration to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will occur when any uncertainty associated with the variable consideration is resolved. The estimate of the Company’s measurement of progress and estimate of variable consideration to be included in the transaction price will be updated at each reporting date as a change in estimate.

For the clinical milestone payments, the Company utilizes the most likely amount method to determine the amounts recognized and timing of recognition. Once the constraint is removed, the clinical milestone payments will be accounted for with the research and development services for the purposes of revenue recognition which will occur over time as the services are provided. Upon the achievement of any milestone for specified clinical development events, the Company will utilize the same cost-to-cost model with a cumulative catch-up recognized in the period in which any such event occurs.

The Company will re-evaluate the transaction price at the end of each reporting period and as uncertain events are resolved, or other changes in circumstances occur, adjust its estimate of the transaction price if necessary. The Company initially recorded the $5.0 million upfront fee as a contract liability for deferred revenue in its consolidated balance sheet.

The following table presents changes in the Company’s accounts receivable and contract liabilities for the three months ended March 31, 2023 (in thousands):

	Balance as of						Balance as of
	December 31, 2022		Additions		Deductions		March 31, 2023
Accounts receivable	$	61	$	28	$	—	$	89
Contract liabilities:
Deferred revenue	$	3,000	$	—	$	—	$	3,000

During the three months ended March 31, 2023 and 2022, the Company recognized the following revenue (in thousands):

	Three Months Ended March 31,
	2023		2022
Revenue recognized in the period from:
Amounts included in deferred revenue at the beginning of the period	$	—	$	438

The current portion of deferred revenue and deferred revenue, net of current portion, are $0.3 million and $2.7 million as of March 31, 2023, respectively, which reflects the Company’s estimate of the revenue it expects to recognize within the next 12 months and beyond 12 months, respectively. The Company expects to recognize the revenue associated with the AstraZeneca Agreement in subsequent periods through the year ending December 31, 2026.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

4.Fair Value Measurements

The following tables present information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy used to determine such fair values (in thousands):

	Fair Value Measurements as of March 31, 2023 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	14,556	$	—	$	—	$	14,556
Investments:
Commercial paper		—		31,874		—		31,874
Corporate bonds		—		11,371		—		11,371
Canadian Government agency debt securities		—		15,987		—		15,987
U.S. Government agency debt securities		—		108,333		—		108,333
	$	14,556	$	167,565	$	—	$	182,121

	Fair Value Measurements as of December 31, 2022 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	4,241	$	—	$	—	$	4,241
U.S. Government agency debt securities		—		5,974		—		5,974
Investments:
Commercial paper		—		28,792		—		28,792
Corporate bonds		—		14,342		—		14,342
Municipal bonds		—		2,697		—		2,697
Canadian Government agency debt securities		—		19,911		—		19,911
U.S. Government agency debt securities		—		77,032		—		77,032
	$	4,241	$	148,748	$	—	$	152,989

During the three months ended March 31, 2023 and the year ended December 31, 2022, there were no transfers between Level 1, Level 2 and Level 3.

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Investments

3 Months Ended

Mar. 31, 2023

Investments Debt And Equity Securities [Abstract]

Investments

5.Investments

Investments consisted of the following (in thousands):

	March 31, 2023
	Amortized Cost		Fair Value
Due within one year or less	$	156,339	$	156,227
Due after one year through three years		11,311		11,338
	$	167,650	$	167,565

	December 31, 2022
	Amortized Cost		Fair Value
Due within one year or less	$	127,441	$	127,013
Due after one year through three years		15,802		15,761
	$	143,243	$	142,774

As of March 31, 2023, the amortized cost and estimated fair value of investments, by contractual maturity, was as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Current		Non-Current
Commercial paper	$	31,892	$	2	$	(20	)	$	31,874	$	31,874	$	—
Corporate bonds		11,386		1		(16	)		11,371		8,405		2,966
Canadian Government agency debt securities		16,009		47		(69	)		15,987		15,987		—
U.S. Government agency debt securities		108,363		89		(119	)		108,333		99,961		8,372
	$	167,650	$	139	$	(224	)	$	167,565	$	156,227	$	11,338

As of December 31, 2022, the amortized cost and estimated fair value of investments, by contractual maturity, was as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Current		Non-Current
Commercial paper	$	28,804	$	10	$	(22	)	$	28,792	$	28,792	$	—
Corporate bonds		14,354		4		(16	)		14,342		9,469		4,873
Municipal bonds		2,705		—		(8	)		2,697		2,697		—
Canadian Government agency debt securities		20,065		23		(177	)		19,911		19,911		—
U.S. Government agency debt securities		77,315		15		(298	)		77,032		66,144		10,888
	$	143,243	$	52	$	(521	)	$	142,774	$	127,013	$	15,761

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Prepaid Expenses and Other Current Assets

3 Months Ended

Mar. 31, 2023

Prepaid Expense And Other Assets Current [Abstract]

Prepaid Expenses and Other Current Assets

6.Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Prepaid external research and development expenses	$	5,282	$	3,741
Prepaid insurance		629		1,295
Prepaid software subscriptions		612		402
Income tax receivable		—		386
Interest receivable		591		332
Other receivable due from AstraZeneca		938		352
Canadian harmonized sales tax receivable		923		592
Other		1,297		509
	$	10,272	$	7,609

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Accrued Expenses

3 Months Ended

Mar. 31, 2023

Payables And Accruals [Abstract]

Accrued Expenses

7.Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Accrued employee compensation and benefits	$	2,532	$	4,140
Accrued external research and development expenses		5,539		4,914
Accrued professional and consulting fees		1,782		916
Unearned grant income		435		591
Other		65		44
	$	10,353	$	10,605

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Debt

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Debt

8.Debt

Long-term debt, net of discount, consisted of the following (in thousands):

	March 31,
	2023
Principal amount of long‑term debt	$	35,000
Less: Current portion of long‑term debt		—
Long‑term debt, net of current portion		35,000
Accretion of Final Fee		195
Debt discount		(835	)
Long‑term debt, net of discount	$	34,360

Loan Agreement

On April 4, 2022 (the “Original Closing Date”), the Company entered into a loan and security agreement (the “Loan Agreement”) with Oxford Finance LLC, as collateral agent and lender (the “Lender”). The Lender initially agreed to make available to the Company term loans in an aggregate principal amount of up to $75.0 million under the Loan Agreement. The Company plans to use the proceeds of the term loans for working capital and general corporate purposes. The Loan Agreement initially provided a term loan commitment of $75.0 million in three potential tranches: (i) a $25.0 million Term A loan facility, with $10.0 million funded on the Original Closing Date and the remaining $15.0 million to be funded at the request of the Company on a one-time basis at any time prior to April 4, 2023, (ii) a $25.0 million Term B loan facility to be funded at the request of the Company, subject to certain conditions being met, no later than June 30, 2023, and (iii) a $25.0 million Term C loan facility to be funded at the Lender’s sole discretion. The term loan facilities have a maturity date of April 1, 2027. Initially borrowings under all three loan facilities bear interest at a floating per annum rate equal to the greater of (i) 8.00% and (ii) the sum of (a) the greater of (x) 1 Month LIBOR Rate and (y) 0.10% plus (b) 7.90%.

On August 23, 2022, the Company and the Lender entered into a Consent and First Amendment to Loan and Security Agreement to amend certain terms of the Loan Agreement.

On September 21, 2022, the Company and the Lender entered into a Second Amendment to Loan and Security Agreement (the “Second Amendment”). The Second Amendment provides a term loan commitment of $75.0 million in four potential tranches: (i) a $10.0 million Term A loan facility, funded on the Original Closing Date, (ii) a $25.0 million Term B loan facility, funded at the request of the Company subject to certain conditions having been met, for which funding took place in connection with the execution of the Second Amendment, (iii) a $15.0 million Term C loan facility to be funded at the request of the Company, subject to certain conditions being met, no later than April 4, 2023, and (iv) a $25.0 million Term D loan facility to be funded at the Lender’s sole discretion. The term loan facilities have a maturity date of April 1, 2027. The floating per annum rate of interest for borrowings under all four loan facilities was amended to the greater of (i) 8.00% and (ii) the sum of (a) 1-Month CME Term SOFR (as defined in the Second Amendment), (b) 0.10% and (c) 7.90%.

Additionally, on March 30, 2023, the Company and the Lender entered into a Third Amendment to Loan and Security Agreement (together with the Loan Agreement, Consent and First Amendment to Loan and Security Agreement, and Second Amendment, the “Amended Loan Agreement”) to amend the availability of the Term C loan facility which is to be funded at the request of the Company, subject to certain conditions being met, no later than March 31, 2024, under the Amended Loan Agreement.

As the terms of the amendments were not substantially different than the terms of the Loan Agreement, the amendments were accounted for as a debt modification. Issuance costs paid to the Lender in connection with the amendments were recorded as an additional

debt discount and will be amortized to interest expense over the remaining term, together with unamortized original issuance costs, using the effective interest method.

The Company is permitted to make interest-only payments on any outstanding amount due under the term loans through June 1, 2025, after which time principal will also be repaid based on an amortization schedule.

The Company is obligated to pay a fee equal to 4.00% of the aggregate amount of the term loans funded (the “Final Fee”), to occur upon the earliest of (i) the maturity date, (ii) the acceleration of the term loans, and (iii) the prepayment of the term loans. The Company accretes the Final Fee that will be due at final repayment to outstanding debt by charges to interest expense over the term of the loans using the effective-interest method.

The Company has the option to prepay all, but not less than all, of the outstanding principal balance of the term loans under the Loan Agreement. If the Company prepays all or a portion of the term loans prior to the maturity date, it is obligated to pay the Lender a prepayment fee based on a percentage of the outstanding principal balance of the loans, equal to 3.00% if the payment occurs on or before 12 months after the funding date of the applicable loan, 2.00% if the prepayment occurs more than 12 months after, but on or before 24 months after, the funding date of the applicable loan, or 1.00% if the prepayment occurs more than 24 months after, but on or before 36 months after, the funding date of the applicable loan, and no prepayment fee is required thereafter.

The Loan Agreement contains financial covenants that require the Company to maintain certain minimum cash balances generally equal to 55% of the outstanding principal or 110% of the outstanding principal in cases where the cash balances are not maintained in accounts pledged as collateral for the benefit of the Lender. The Company was in compliance with all such covenants as of March 31, 2023. The Loan Agreement contains customary representations, warranties and covenants and also includes customary events of default, including payment defaults, breaches of covenants, change of control and a material adverse change default. Upon the occurrence of an event of default, a default interest rate of an additional 5.00% per annum may be applied to the outstanding loan balances, and the Lender may declare all outstanding obligations immediately due and payable. The Company’s obligations under the Loan Agreement are collateralized by a first priority security interest in substantially all of its assets.

As of March 31, 2023, the estimated future principal payments due were as follows (in thousands):

Year Ending December 31,
2023 (nine months)	$	—
2024		—
2025		10,652
2026		18,261
2027		6,087
	$	35,000

In connection with the Loan Agreement and the funding of the Term A loan facility, the Company issued warrants to the Lender (the “Term A Warrants”) (see Note 9) to purchase an aggregate of 26,110 common shares, equal to 2.00% of the $10.0 million funded from the Term A loan facility divided by the exercise price of $7.66 per share.

In connection with the funding of the Term B loan facility, the Company issued warrants to the Lender (the “Term B Warrants”) (see Note 9) to purchase an aggregate 170,010 common shares, equal to 2.00% of the $25.0 million funded from the Term B loan facility divided by the exercise price of $2.94 per share.

The Company is obligated to issue additional warrants (the “Additional Warrants”) to the Lender in the event the Term C loan facility and/or the Term D loan facility is funded. The Additional Warrants will also be equal to 2.00% of the term loan funded. Each warrant will terminate ten years from the date of its original issuance.

The Company accounted for the Term A Warrants and Term B Warrants as equity instruments since they were indexed to the common shares and met the criteria for equity classification. The relative fair value of the Term A Warrants and Term B Warrants were $0.1 million and $0.4 million, respectively, and were recorded as a debt discount. This amount is being amortized to interest expense over the term of the loans using the effective-interest method. The Company estimated the fair value of the Term A Warrants and Term B Warrants using the Black-Scholes option-pricing model.

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Equity

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Equity

9.Equity

Common Shares

On February 13, 2023, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with the purchasers named therein (the “Investors”). Pursuant to the Purchase Agreement, the Company agreed to sell an aggregate of 17,648,596 of its common shares, no par value per share, at a purchase price equal to $3.40 per share, which represents the closing price on the Nasdaq Global Select Market on February 10, 2023, to the Investors for net proceeds of approximately $56.0 million after deducting fees and offering costs (collectively, the “Offering”). The Offering closed on February 16, 2023.

In July 2021, the Company entered into an Open Market Sales AgreementSM (the “Sales Agreement”) with Jefferies LLC to issue and sell common shares of up to $100.0 million in gross proceeds, from time to time during the term of the Sales Agreement, through an “at-the-market” equity offering program under which Jefferies LLC will act as the Company’s agent and/or principal (the “ATM Facility”). The ATM Facility provides that Jefferies LLC will be entitled to compensation for its services in an amount of up to 3.0% of the gross proceeds of any shares sold under the ATM Facility. The Company has no obligation to sell any shares under the ATM Facility and may, at any time, suspend solicitation and offers under the Sales Agreement. As of March 31, 2023, the Company has sold 2,210,217 common shares for net proceeds of $9.2 million under the Sales Agreement.

As of March 31, 2023, the Company’s articles of the corporation, as amended and restated, authorized the Company to issue unlimited common shares, each with no par value per share.

Each common share entitles the holder to one vote on all matters submitted to a vote of the Company’s shareholders. Common shareholders are entitled to receive dividends, if any, as may be declared by the board of directors. Through March 31, 2023, no cash dividends had been declared or paid by the Company.

Warrants

In January 2020, the Company issued to the existing holders of Class B convertible preferred shares warrants to purchase 3,126,391 Class B convertible preferred shares, at an exercise price of $1.5154 per share, and Fusion Pharmaceuticals (Ireland) Limited, the Company’s former Irish subsidiary, issued to the existing holders of Class B preferred exchangeable shares warrants to purchase 873,609 Class B preferred exchangeable shares, at an exercise price of $1.5154 per share (collectively the “Preferred Share Warrants”). The Preferred Share Warrants were immediately exercisable and expire two years from the date of issuance or upon the earlier occurrence of specified qualifying events.

Upon the closing of the IPO, the warrants to purchase the convertible preferred shares and warrants to purchase the preferred exchangeable shares of the Company’s former Irish subsidiary were converted into warrants to purchase 749,197 common shares at an exercise price of $8.10 per share. In January 2022, the remaining 651,816 of unexercised common share warrants expired.

In April 2022, in connection with the Loan Agreement with Oxford Finance LLC (see Note 8) and the funding of the Term A loan facility, the Company issued warrants to the Lender to purchase an aggregate of 26,110 common shares, equal to 2.00% of the $10.0 million funded from the Term A loan facility divided by the exercise price of $7.66 per share.

In September 2022, the Term B loan facility was funded by Oxford Finance LLC and the Company issued warrants to the Lender to purchase an aggregate of 170,010 common shares, equal to 2.00% of the $25.0 million funded from the Term B loan facility divided by the exercise price of $2.94 per share.

The Company is obligated to issue additional warrants to the Lender in the event the Term C loan facility and/or the Term D loan facility is funded. As of March 31, 2023, there were 196,120 common share warrants outstanding.

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Share-Based Compensation

3 Months Ended

Mar. 31, 2023

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

10.Share-based Compensation

2020 Stock Option and Incentive Plan

On June 18, 2020, the Company’s board of directors adopted the 2020 Stock Option and Incentive Plan (the “2020 Plan”), which became effective on June 24, 2020. The 2020 Plan provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock units, restricted stock awards, unrestricted stock awards, cash-based awards and dividend equivalent rights to the Company’s officers, employees, non-employee directors and consultants. The number of shares initially reserved for issuance under the 2020 Plan was 4,273,350, which is cumulatively increased each January 1 by 4% of the number of the Company’s common shares outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s compensation committee of the board of directors. The common shares underlying any awards that are forfeited, cancelled, held back upon exercise or settlement of an award to satisfy the exercise price or tax withholding, reacquired by the Company prior to vesting, satisfied without the issuance of shares, expire or are otherwise terminated (other than by exercise) under the 2020 Plan and the Company’s 2017 Equity Incentive Plan (the “2017 Plan”) will be added back to the common shares available for issuance under the 2020 Plan. The total number of common shares reserved for issuance under the 2020 Plan was 10,073,459 shares as of March 31, 2023.

As of March 31, 2023, 1,370,967 shares, remained available for future grant under the 2020 Plan. Shares that are expired, forfeited, canceled or otherwise terminated without having been fully exercised will be available for future grant under the 2020 Plan.

2017 Equity Incentive Plan

The 2017 Plan provides for the Company to grant incentive stock options or nonqualified stock options, restricted share awards and restricted share units to employees, officers, directors and non-employee consultants of the Company.

As of March 31, 2023 and December 31, 2022, no shares remained available for future grant under the 2017 Plan. Shares that are expired, forfeited, canceled or otherwise terminated without having been fully exercised will be available for future grant under the 2020 Plan.

2020 Employee Share Purchase Plan

On June 18, 2020, the Company’s board of directors adopted the 2020 Employee Share Purchase Plan (the “ESPP”), which became effective on June 24, 2020. A total of 450,169 common shares were reserved for issuance under this plan. In addition, the number of common shares that may be issued under the ESPP is automatically increased each January 1 by the lesser of (i) 900,338 common shares, (ii) 1% of the number of the Company’s common shares outstanding on the immediately preceding December 31 and (iii) such lesser number of shares as determined by the Company’s compensation committee of the board of directors. As of March 31, 2023, 43,857 shares were issued under the ESPP. The total number of common shares reserved for issuance under the ESPP was 1,746,220 shares as of March 31, 2023.

Stock Option Valuation

The fair value of stock option grants is estimated using the Black-Scholes option-pricing model. The Company historically has been a private company and lacks company-specific historical and implied volatility information. Therefore, it estimates its expected share volatility based on the historical volatility of a publicly traded set of peer companies and expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded share price. For options with service-based vesting conditions, the expected term of the Company’s stock options has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The expected term of stock options granted to non-employee consultants is equal to the contractual term of the option award. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company has never paid cash dividends and does not expect to pay any cash dividends in the foreseeable future.

The following table presents, on a weighted-average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted:

	Three Months Ended March 31,
	2023			2022
Risk-free interest rate		3.85	%		1.72	%
Expected term (in years)		6.0			6.0
Expected volatility		65.2	%		65.7	%
Expected dividend yield		0	%		0	%

Stock Options

The following table summarizes the Company’s stock option activity since December 31, 2022:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)		(in thousands)
Outstanding as of December 31, 2022		10,531,555		$	7.08		7.5	$	4,434
Granted		3,870,000			3.70
Exercised		—			—
Forfeited/cancelled		(456,539	)		7.44
Outstanding as of March 31, 2023		13,945,016		$	6.13		8.2	$	7,165
Vested and expected to vest as of March 31, 2023		13,853,950		$	6.09		8.2	$	7,165
Options exercisable as of March 31, 2023		5,614,768		$	6.68		6.7	$	5,192

Included in the table above are 2,443,800 options outstanding as of March 31, 2023 that were granted outside of the 2020 Plan. The grants were made pursuant to the NASDAQ inducement grant exception in accordance with NASDAQ Listing Rule 5635(c)(4).

The aggregate intrinsic value of options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common shares for those options that had exercise prices lower than the fair value of the Company’s common shares. There were no stock options exercised during the three months ended March 31, 2023. The intrinsic value for stock options exercised during the three months ended March 31, 2022 was $0.2 million. The weighted-average grant-date fair value of stock options granted during the three months ended March 31, 2023 and 2022 was $2.31 and $4.55 per share, respectively.

Restricted Stock Units

The following table summarizes the Company’s restricted stock unit activity since December 31, 2022:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2022		65,500	$	5.91
Granted		—		—
Vested		—		—
Forfeited		—		—
Unvested as of March 31, 2023		65,500	$	5.91

Share-based Compensation

Share-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Research and development expenses	$	1,138	$	885
General and administrative expenses		2,011		1,748
	$	3,149	$	2,633

As of March 31, 2023, total unrecognized share-based compensation expense related to unvested stock options was $27.4 million, which is expected to be recognized over a weighted-average period of 3.0 years. Additionally, as of March 31, 2023, the Company has unrecognized share-based compensation expense of $0.7 million related to unvested stock options with performance-based vesting conditions for which performance has not been deemed probable.

As of March 31, 2023, total unrecognized share-based compensation expense related to unvested restricted stock units was $0.3 million, which is expected to be recognized over a weighted-average period of 2.1 years.

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License Agreements and Asset Acquisitions

3 Months Ended

Mar. 31, 2023

License Agreement [Abstract]

License Agreements and Asset Acquisitions

11.License Agreements and Asset Acquisitions

License Agreement with the Centre for Probe Development and Commercialization Inc.

In November 2015, the Company entered into a license agreement with the Centre for Probe Development and Commercialization Inc. (“CPDC”), a related party (see Note 16) (the “CPDC Agreement”). Under the CPDC Agreement, the Company was granted an exclusive, sublicensable, nontransferable, worldwide license under CPDC’s patent rights related to CPDC’s radiopharmaceutical linker technology to develop, market, make, use and sell certain products for all disease indications and uses in humans, whether diagnostic or therapeutic. The Company has the right to grant sublicenses of its rights. The CPDC Agreement was amended in 2017; however, there were no material changes to the terms of the CPDC Agreement. Also in 2017, the Company entered into a second license agreement with CPDC, under which the Company was granted an exclusive, sublicensable, worldwide license under CPDC’s patent rights related to certain CPDC radiopharmaceutical linker technology to develop, market, make, use and sell certain products for all disease indications and uses in humans. The Company has the right to grant sublicenses of its rights.

The Company has no obligations under any of the agreements with CPDC to make any milestone payments or to pay any royalties or annual maintenance fees to CPDC.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to CPDC or recognize any research and development expenses under the license agreements with CPDC.

License Agreement with ImmunoGen, Inc.

In December 2016, the Company entered into a license agreement with ImmunoGen, Inc. (“ImmunoGen”) (the “ImmunoGen Agreement”). Under the ImmunoGen Agreement, the Company was granted an exclusive, sublicensable, worldwide license under ImmunoGen’s patent rights to use, develop, manufacture and commercialize any radiopharmaceutical conjugate that includes a certain compound and any resulting commercialized products. The Company has the right to grant sublicenses of its rights.

Under the ImmunoGen Agreement, the Company paid an upfront fee of $0.2 million to ImmunoGen. In addition, the Company is obligated to make aggregate milestone payments to ImmunoGen of up to $15.0 million upon the achievement of specified development and regulatory milestones and of up to $35.0 million upon the achievement of specified sales milestones. The Company is also obligated to pay tiered royalties of a low to mid single-digit percentage based on annual net sales by the Company and any of its affiliates and sublicensees. Royalties will be paid by the Company on a country-by-country basis beginning upon the first commercial sale in such country until ten years following the date of the first commercial sale in the United States and five years following the date of the first commercial sale in all non-U.S. countries. In addition, the Company is responsible for all costs and expenses incurred related to the development, manufacture, regulatory approval and commercialization of all licensed products.

Prior to regulatory approval of a licensed product in any country, the Company has the right to terminate the agreement upon 90 days’ prior written notice to ImmunoGen. Upon receipt of its first regulatory approval of a licensed product in any country, the Company has the right to terminate the agreement upon 180 days’ prior written notice to ImmunoGen. If the Company or ImmunoGen fails to comply with any of its obligations or otherwise breaches the agreement, the other party may terminate the agreement. The ImmunoGen Agreement expires upon the expiration date of the last-to-expire royalty term.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to ImmunoGen or recognize any research and development expenses under the ImmunoGen Agreement.

Asset Acquisition from Rainier Therapeutics, Inc. and License Agreement with Genentech, Inc.

In March 2020 (the “Closing”), the Company and Rainier Therapeutics, Inc. (“Rainier”) entered into an asset acquisition agreement (the “Rainier Agreement”). Under the Rainier Agreement, the Company purchased all rights, title and interest to Rainier’s, and any of its affiliates’ and sublicensees’, patents and other tangible and intangible assets to perform research and to develop, manufacture and commercialize a specified compound of antibody molecules that bind to targets for the prevention, treatment and diagnosis of all diseases and conditions only using such compound as an antibody drug conjugate. The Company concluded to account for this purchase as an asset acquisition as substantially all of the fair value of the gross assets acquired was concentrated in a single identifiable asset, the license rights.

In connection with the asset acquisition, the Company paid an upfront fee of $1.0 million to Rainier and recognized this amount as research and development expense in the condensed consolidated statement of operations and comprehensive loss during the year ended December 31, 2020, as the IPR&D acquired had no alternative future use as of the acquisition date.

Unless the Rainier Agreement was terminated pursuant to its terms, which termination initially could not have occurred later than eight months following the Closing (the “Outside Date”), the Company was obligated to pay Rainier an additional amount of $3.5

million and to issue 313,359 of the Company’s common shares on the Outside Date. Since the Rainier Agreement was not terminated by the Outside Date, as further described below, the Company is also obligated to make aggregate milestone payments to Rainier of up to $22.5 million and to issue up to 156,679 of the Company’s common shares upon the achievement of specified development and regulatory milestones and of up to $42.0 million upon the achievement of specified sales milestones.

In the event the Company enters into a transaction with a non-affiliated party relating to the license or sale of substantially all the Company’s rights to develop the specified compound of antibody molecules, the Company will be obligated to pay Rainier a specified percentage of the revenue from such transaction, in an amount ranging from 10% to 30%, based on how long after the Closing the transaction takes place.

The Rainier Agreement could have been terminated at any time prior to the Outside Date upon 30 days’ notice by the Company to Rainier or upon the mutual written consent of both parties. In October 2020, the Company and Rainier entered into a first amendment to the Rainier Agreement (the “First Amended Rainier Agreement”) to extend certain terms of the Rainier Agreement. Specifically, the Outside Date was amended such that termination may not occur later than eleven months following the Closing, or February 10, 2021 (the “Revised Outside Date”). In February 2021, the Company and Rainier entered into a second amendment to the First Amended Rainier Agreement, as amended (the “Second Amended Rainier Agreement”). Pursuant to the Second Amended Rainier Agreement, the Outside Date was further amended such that termination may not occur later than July 1, 2021, and such amendment was made in consideration for early payment of the additional $3.5 million owed to Rainier which the Company paid and recorded as research and development expense during the three months ended March 31, 2021. In May 2021, the Company notified Rainier of its intent to continue development of the asset and issued 313,359 of its common shares to Rainier on July 1, 2021. In August 2022, the Company announced the dosing of the first patient in a Phase 1 study of FPI-1966 and paid a $2.0 million milestone payment and issued 156,679 common shares to Rainier. In May 2023, the Company ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision.

During the three months ended March 31, 2023 and 2022, the Company did not recognize any research and development expense associated with the Second Amended Rainier Agreement.

In connection with the Rainier Agreement, in March 2020, the Company was assigned all of Rainier’s rights and obligations under an exclusive license agreement between BioClin Therapeutics, Inc. and Genentech, Inc. (“Genentech”) (the “Genentech License Agreement”). Pursuant to the Genentech License Agreement, the Company has an exclusive, worldwide, sublicensable license to make, use, research, develop, sell and import certain intellectual property and technology of Genentech relating to a specified antibody and any mutant antibody thereof (the “Licensed Antibodies”), including any products that contain a Licensed Antibody as an active ingredient (the “Products”), for all human uses.

Pursuant to the Genentech License Agreement, the Company is obligated to use commercially reasonable efforts to develop and commercialize at least one Product and the Company is solely responsible for the costs associated with the development, manufacturing, regulatory approval and commercialization of any Products. The manufacture of the antibody by any third-party contract development and manufacturing organization (“CDMO”) must be approved in advance by Genentech. Additionally, Genentech retains the right to use the Licensed Antibodies solely to research and develop molecules other than the Licensed Antibodies.

Under Genentech License Agreement, the Company is obligated to make aggregate milestone payments to Genentech of up to $44.0 million upon the achievement of specified sales milestones. The Company is also obligated to pay to Genentech tiered royalties of a mid to high single-digit percentage based on annual net sales by the Company, and any of its affiliates and sublicensees, for the specified compound of antibody molecules and of a mid to high single-digit percentage based on annual net sales by the Company, and any of its affiliates and sublicensees, for any other compound containing mutant antibody molecules of the specified compound. In addition, the Company is obligated to pay to Genentech royalties of a low single-digit percentage based on quarterly net sales in any country in which the specified compound is not covered by a valid patent claim, and those sales will not be subject to the tiered royalties described above. All royalties may be reduced if the Company obtains a license under a third-party patent that includes the specified compound. Royalties will be paid by the Company on a country-by-country basis beginning upon the first commercial sale in such country until the later of (i) ten years following the date of the first commercial sale of a Product or (ii) the date the specified compound is no longer covered by an enforceable patent. Upon the expiration of the royalty term, the Company will have a fully paid-up license.

The Company has the right to terminate the Genentech License Agreement upon written notice to Genentech if the Company determines in its sole discretion that development or commercialization of Products is not economically or scientifically feasible or appropriate. In addition, if the Company or Genentech fails to comply with any of its obligations or otherwise breaches the agreement, the other party may terminate the agreement. The Genentech License Agreement expires on the date on which all obligations under the agreement related to milestone payments or royalties have passed or expired. In May 2023, the Company ceased further clinical development of FPI-1966 as a result of a portfolio prioritization decision.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to Genentech or recognize any research and development expenses under the Genentech License Agreement.

Collaboration Agreement and Supply Agreement with TRIUMF Innovations, Inc.

On December 10, 2020, the Company entered into a Collaboration Agreement and Supply Agreement (the “Collaboration Agreement”) with TRIUMF Innovations Inc. and TRIUMF JV (collectively, “the TRIUMF entities”) for the development, production and supply of actinium-225 (“225Ac”) to the Company. Under the Collaboration Agreement as executed in December 2020, the Company is obligated to pay the TRIUMF entities an aggregate of $5.0 million CAD upon the achievement of certain milestones. The Collaboration Agreement contemplated that the parties would enter into an amendment thereto to expand the scope of the project and provide for additional milestone payments.

As of March 31, 2023, the TRIUMF entities had achieved certain milestones under the Collaboration Agreement totaling $3.0 million CAD (equivalent to $2.3 million at the time of payment) which were paid during the year ended December 31, 2021 and are being recognized as research and development expense over the period of performance by the TRIUMF entities. During the three months ended March 31, 2023, the Company recognized the amortization of less than $0.1 million as research and development expense under the Collaboration Agreement. During the three months ended March 31, 2022, the Company did not recognize any research and development expense under the Collaboration Agreement.

As previously contemplated, on August 12, 2021, the parties amended the Collaboration Agreement in order to expand the scope of the project and the Company agreed to make an additional financial investment of up to $15.0 million CAD in connection with development of new process technology for the manufacture of 225Ac upon the achievement of certain milestones under an amendment to the Collaboration Agreement (the “Amended Collaboration Agreement”). In connection with the Amended Collaboration Agreement, the parties have formed a company (“NewCo”) to hold certain intellectual property derived from the collaboration. NewCo is jointly owned and managed by the Company and the TRIUMF entities and its purpose is to manufacture 225Ac for the research, clinical and commercial needs of the Company, and in certain circumstances, other third parties. The supply of 225Ac by NewCo to the Company shall be done under a commercial supply agreement, to be negotiated by NewCo and the Company. The Company is expected to purchase at least 50% of its annual 225Ac requirements from NewCo, unless NewCo is unable to supply such necessary quantities to the Company, in which case the Company may use other 225Ac suppliers to meet its commercial needs. As of March 31, 2023, there were no assets held by NewCo.

As of March 31, 2023, the TRIUMF entities had achieved certain milestones under the Amended Collaboration Agreement totaling $8.5 million CAD (equivalent to $6.6 million at the time of payment), of which $2.6 million was paid during the year ended December 31, 2022 and $3.9 million was paid during the year ended December 31, 2021. These amounts are being recognized as research and development expense over the period of performance by the TRIUMF entities. During the three months ended March 31, 2023 and 2022, the Company recognized the amortization of $0.3 million and $0.2 million, respectively, as research and development expense under the Amended Collaboration Agreement.

The Company recorded $2.1 million of milestone payments in prepaid expenses and other current assets and other non-current assets, respectively, as of March 31, 2023 based on its estimate of costs to be incurred over the 12 months following the balance sheet date for both the Collaboration Agreement and the Amended Collaboration Agreement.

Asset Acquisition from Ipsen Pharma SAS

In March 2021, the Company and Ipsen Pharma SAS (“Ipsen”) announced that the parties had entered into an asset purchase agreement (the “Ipsen Agreement”) whereby the Company agreed to acquire Ipsen’s intellectual property and assets related to IPN-1087, a small molecule targeting neurotensin receptor 1 (“NTSR1”), a protein expressed on multiple solid tumor types. The Company intends to combine its expertise and proprietary TAT platform with IPN-1087 to create an alpha-emitting radiopharmaceutical targeting solid tumors expressing NTSR1. The Company and Ipsen submitted a pre-merger notification and report form with the United States Federal Trade Commission and the Antitrust Division of the United States Department of Justice in accordance with the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”). The acquisition closed after completion of this antitrust review in April 2021. The Company concluded to account for this purchase as an asset acquisition as substantially all of the fair value of the gross assets acquired was concentrated in a single identifiable asset, the license rights.

Upon closing of the asset acquisition, the Company paid €0.6 million ($0.8 million at the date of payment) and issued an aggregate of 600,000 common shares to Ipsen under a share purchase agreement which was entered into concurrently with the Ipsen Agreement. Such common shares were issued pursuant to an exemption from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”). The Company is also obligated to pay Ipsen up to an additional €67.5 million upon the achievement of certain development and regulatory milestones; low single digit royalties on potential future net sales; and up to €350.0 million in net sales

milestones, in each case, relating to products covered by the asset purchase agreement. The Company is responsible for paying to a third-party licensor up to a total of €70.0 million in development milestones for up to three indications and mid to low double-digit royalties on potential future net sales of products covered by the license agreement.

During the three months ended March 31, 2023 and 2022, the Company did not make any payments to Ipsen or recognize any research and development expenses under the Ipsen Agreement.

The Ipsen Agreement includes a royalty step down whereby royalties owed to Ipsen will be reduced by certain percentages not to exceed 50%, in the aggregate, of the royalty owed under certain circumstances relating to loss of patent exclusivity, loss of regulatory exclusivity or generics entering a market. Under the asset purchase agreement Ipsen has agreed not to develop a molecule that targets NTSR1 and combines at least one NTSR1 binding moiety and a radionuclide or cytotoxic agent until the earlier of (i) the seventh anniversary of the closing date or (ii) the date of data base lock after completion of the first phase 3 clinical trial for IPN-1087.

Agreement with Merck & Co.

In May 2021, the Company entered into an agreement with two subsidiaries of Merck & Co. (“Merck”). Pursuant to the agreement, Merck will provide to the Company, at no cost, its anti-PD-1 (programmed death receptor-1) therapy, KEYTRUDA® (pembrolizumab) to evaluate in combination with the Company’s lead candidate, FPI-1434. The planned Phase 1 combination trial will evaluate safety, tolerability and pharmacokinetics of FPI-1434 in combination with pembrolizumab and is expected to initiate approximately six to nine months after achieving the recommended Phase 2 dose in the ongoing Phase 1 study of FPI-1434 monotherapy. Under the agreement, the Company will sponsor, fund and conduct the combination trial in accordance with an agreed-upon protocol and Merck agreed to manufacture and supply its compound, at its cost and for no charge to the Company, for use in the clinical trial.

Collaboration and Supply Agreement with Niowave, Inc.

On June 9, 2022, the Company entered into a Collaboration and Supply Agreement with Niowave, Inc. (“Niowave”) (as amended from time to time, the “Niowave Agreement”) for the development, production and supply of 225Ac to the Company. Under the Niowave Agreement, the Company is obligated to pay Niowave an aggregate of $5.0 million upon the achievement of certain milestones.

On September 26, 2022, the Company entered into an amendment to the Niowave Agreement to amend certain terms of the Niowave Agreement, but made no change to the aggregate milestone payments owed under the Niowave Agreement.

As of March 31, 2023, Niowave had achieved certain milestones under the Niowave Agreement totaling $2.8 million, of which $1.9 million was paid during the three months ended March 31, 2023 and $0.9 million was paid during the year ended December 31, 2022. These amounts are being recognized as research and development expense over the period of performance by Niowave. During the three months ended March 31, 2023, the Company recognized $0.2 million as research and development expense under the Niowave Agreement.

RadioMedix Option and Asset Purchase Agreement

On November 14, 2022, the Company and RadioMedix, Inc. (“RadioMedix”) entered into an option and asset purchase agreement (the “RadioMedix Agreement”), pursuant to which RadioMedix granted to the Company the exclusive right, but not the obligation (the “RadioMedix Option”), to acquire certain of RadioMedix’s assets related to its on-going Phase 2 clinical trial evaluating 225Ac PSMA I&T (the “TATCIST Study”), a small molecule targeting prostate specific membrane antigens, expressed on prostate tumors. Such assets include, among other things, the investigational new drug application for the TATCIST Study, any third-party license held, or later acquired, by RadioMedix relating to 225Ac PSMA, and clinical and other data for the TATCIST Study (collectively, the “RadioMedix Assets”). The Company paid RadioMedix an option fee of $0.8 million upon the execution of the RadioMedix Agreement, which was recorded as research and development expense in its consolidated statements of operations and comprehensive loss during the year ended December 31, 2022.

On February 10, 2023, the Company notified RadioMedix of its decision to exercise the RadioMedix Option, paid the $1.5 million option exercise fee and closed the acquisition. During the three months ended March 31, 2023, the Company recognized the $1.5 million option exercise fee as research and development expense under the RadioMedix Agreement.

The alpha-emitting radiopharmaceutical being evaluated in the TATCIST Study is now referred to as FPI-2265.

Pursuant to the terms of the RadioMedix Agreement, the Company is obligated to pay RadioMedix (i) up to an additional $10.5 million upon the achievement of certain clinical and regulatory milestones, (ii) low single-digit royalties on potential future net sales, subject to specified reductions, and (iii) up to an additional $50.0 million in net sales milestones; in each case, relating to products

covered by the RadioMedix Agreement. In addition, in the event RadioMedix or the Company is successful in obtaining certain intellectual property rights from a third party relating to 225Ac PSMA I&T, the amount of the clinical and regulatory milestone payments will be increased by up to an aggregate of $4.0 million and the royalty rates will increase but remain in the low- to mid-single digits.

Pursuant to the RadioMedix Agreement, the Company is prohibited from terminating or deprioritizing the development of 225Ac PSMA I&T, subject to specified exceptions. If the Company terminates or deprioritizes the development of 225-225Ac PSMA I&T, and does not sell, license or otherwise transfer its rights to a third-party within 12 months of such termination, the Company and RadioMedix are required to negotiate the return of 225Ac PSMA I&T and related assets to RadioMedix in return for specified reimbursement costs to the Company.

RadioMedix has agreed, subject to certain exceptions, not to develop or research a molecule that targets PSMA for a certain period of time following the closing date.

Additionally, the Company and RadioMedix have entered into manufacturing agreements under which RadioMedix will supply FPI-2265 to the Company for use in clinical trials. RadioMedix will not be the sole manufacturer to supply FPI-2265 for use in clinical trials.

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Income Taxes

3 Months Ended

Mar. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

12.Income Taxes

The Company is domiciled in Canada and is primarily subject to taxation in that country. During the three months ended March 31, 2023 and 2022, the Company recorded no income tax benefits for the net operating losses incurred or for the research and development tax credits generated in Canada in each period due to its uncertainty of realizing a benefit from those items. During the three months ended March 31, 2023, the Company recorded a tax benefit of less than $0.1 million primarily related to the Company’s foreign-derived intangible income deduction, partially offset by discrete share-based compensation items. Under the Tax Cuts and Jobs Act, taxpayers can no longer immediately expense qualified research and development expenditures. Taxpayers are now required to capitalize and amortize these costs over five years for research conducted within the United States or 15 years for research conducted abroad. As a result, the capitalization requirement increased the Company’s deferred tax assets and current tax liabilities, but also decreased its effective tax rate by increasing the foreign-derived intangible income deduction. During the three months ended March 31, 2022, the Company recorded a tax benefit of $0.1 million related to discrete share-based compensation items arising in the quarter, partially offset by income tax obligations of its operating company in the U.S., which typically generates a profit for tax purposes.

The Company’s tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate (“AETR”), adjusted for the effect of discrete items arising in that quarter. The impact of such inclusions could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings or losses versus annual projections. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter. For the three months ended March 31, 2023 and 2022, the Company excluded Canada from the calculation of the AETR as the Company anticipates an ordinary loss in this jurisdiction for which no tax benefit can be recognized.

The Company has evaluated the positive and negative evidence bearing upon its ability to realize its deferred tax assets both in the United States and Canada, which primarily consist of net operating loss carryforwards in Canada. The Company has considered its history of cumulative net losses in Canada, estimated future taxable income and prudent and feasible tax planning strategies and has concluded that it is more likely than not that the Company will not realize the benefits of its Canadian deferred tax assets. As a result, as of March 31, 2023 and December 31, 2022, the Company has recorded a full valuation allowance against its net deferred tax assets in Canada.

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Net Loss per Share

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Net Loss per Share

13.Net Loss per Share

Net Loss per Share Attributable to Common Shareholders

Basic and diluted net loss per share attributable to common shareholders was calculated as follows (in thousands, except share and per share amounts):

	Three Months Ended March 31,
	2023			2022
Numerator:
Net loss	$	(24,291	)	$	(19,909	)
Denominator:
Weighted-average common shares outstanding—basic and diluted		53,775,985			43,170,076
Net loss per share attributable to common shareholders —basic    and diluted	$	(0.45	)	$	(0.46	)

The Company’s potentially dilutive securities, which include stock options and common share warrants, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted-average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common shareholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common shareholders for the periods indicated because including them would have had an anti-dilutive effect:

	Three Months Ended March 31,
	2023		2022
Options to purchase common shares		13,945,016		10,112,732
Unvested restricted stock units		65,500		—
Warrants to purchase common shares		196,120		—
		14,206,636		10,112,732

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Leases

3 Months Ended

Mar. 31, 2023

Leases [Abstract]

Leases

14.Leases

In August 2018, the Company entered into an operating lease for office space in Hamilton, Ontario. This lease was amended in September 2020 (“New Lease Commencement Date”) and expires in August 2030 with a termination option upon twelve months written notice any time after the fifth anniversary of the New Lease Commencement Date. If the termination option is not exercised, the Company may exercise a renewal option to extend the term for an additional five-year period through August 2035. As the Company is not reasonably certain to extend the lease beyond the allowable termination date, the lease term was determined to end in August 2026 for the purposes of measuring this lease.

In October 2019, the Company entered into an operating lease for office space in Boston, Massachusetts, which expires February 2026 and has no renewal options. In connection with entering into the original lease agreement, the Company issued a letter of credit of $1.5 million for the benefit of the landlord, which was reduced to $1.0 million during the three months ended March 31, 2023. As of March 31, 2023, $0.2 million and $0.8 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash. As of December 31, 2022, $0.2 million and $1.0 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash.

In March 2021, the Company entered into an amendment to its lease for office space in Boston, Massachusetts to expand the area under lease (“Expansion Premises”) and extend the term of the premises currently under lease (“Original Premises”) to align with the lease end date for the Expansion Premises. The additional rent for the Expansion Premises was determined to be commensurate with the additional right-of-use and is accounted for as a new operating lease that was recognized on the Company’s balance sheet since the Company was able to access the Expansion Premises upon execution of the amendment. The Company has made certain improvements to the Expansion Premises, for which the landlord has provided the Company an allowance of $0.2 million which was recorded as a reduction to operating lease right-of-use assets and operating lease liabilities as of December 31, 2021, and for which reimbursement was received during the year ended December 31, 2022. The rental payments for the Expansion Space commenced on January 1, 2022. The lease end date for the Original Premises and the Expansion Premises is April 30, 2027, with no option to extend the lease term. The

lease modification for the extension of the Original Premises and the recognition of the Expansion Premises resulted in increases to the Company’s right-of-use asset balance, which was obtained in exchange for operating lease liabilities, of $0.9 million and $1.2 million, respectively.

In June 2021, the Company entered into a lease for a manufacturing facility in Hamilton, Ontario. The Company currently expects the rent for the manufacturing facility to commence in June 2023, approximately two months after the delivery date of the premises. The Company currently expects the lease end date for the manufacturing facility to be in June 2038. The lease has a five-year renewal option, which the Company is not reasonably certain to exercise and therefore was not included in the expected lease term. Upon execution of the lease in June 2021, the Company paid $2.5 million CAD (equivalent to $2.1 million at the time of payment) which represented an initial direct cost paid prior to the lease commencement date. The Company determined that the lease is an operating lease and commenced for accounting purposes on March 31, 2023, when the Company obtained access to the space for its’ intended use. On March 31, 2023, in connection with the lease commencement for accounting purposes, the Company recorded an operating right-of-use asset of $10.4 million (including the $2.1 million payment that was previously recorded to prepaid rent as a component of other non-current assets) obtained in exchange for an operating lease liability of $8.6 million.

On January 12, 2022, the Company entered into an operating lease for office space in Hamilton, Ontario. This lease was amended and commenced in February 2022 and is set to expire in August 2030. The lease has a five-year renewal option upon twelve months written notice prior to the expiration of the original term, which the Company is not reasonably certain to exercise and therefore was not included in the lease term for the purposes of measuring the lease. As a result, the Company recognized an operating lease liability and operating lease right-of-use asset of $0.3 million at lease commencement in February 2022.

From time to time, the Company enters into arrangements with CDMOs for the manufacture of materials for research and development purposes, including the manufacture of clinical trial materials. These contracts generally provide for certain non-cancellable obligations. The Company concluded that one such agreement contains an embedded lease as a controlled environment room at the facility is designated for the Company’s exclusive use during the term of the agreement. Upon the lease commencement in February 2023, the Company recorded an operating right-of-use asset of $2.2 million and corresponding operating lease liability of $1.5 million. The arrangement expires in March 2025.

The components of operating lease cost, which are included within operating expenses in the accompanying condensed consolidated statements of operations and comprehensive loss, are as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Operating lease cost	$	496	$	366
Variable lease cost		22		13
Total lease cost	$	518	$	379

The following table summarizes supplemental information for the Company’s operating leases:

	As of March 31,
	2023
Weighted-average remaining lease term (in years)		10.0
Weighted average discount rate		10.9	%
Cash paid for amounts included in the measurement of lease liabilities (in thousands)	$	437

As of March 31, 2023, the future maturities of operating lease liabilities are as follows (in thousands):

Year Ending December 31,
2023 (nine months)	$	4,038
2024		3,116
2025		2,578
2026		2,338
2027		1,326
Thereafter		13,429
Total lease payments	$	26,825
Less: imputed interest		(11,120	)
Total lease liabilities	$	15,705

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2023

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

15.Commitments and Contingencies

Manufacturing Commitments

In January 2019, and as amended in September 2020, the Company entered into an agreement with CPDC, a related party (see Note 16), to manufacture clinical trial materials. In August 2022, this agreement was assigned and transferred to a third-party CDMO who is not a related party. As of March 31, 2023, the Company had non-cancelable minimum purchase commitments under the agreement totaling $0.4 million over the following twelve months.

In May 2019, the Company entered into an agreement with a third-party CDMO to manufacture clinical trial materials. As of March 31, 2023, the Company had non-cancelable minimum purchase commitments under the agreement totaling $0.5 million over the following twelve months.

On January 26, 2023, the Company entered into an agreement with another third-party CDMO to manufacture clinical trial materials. As of March 31, 2023, the Company had non-cancelable minimum purchase commitments under the agreement totaling $0.3 million over the following twelve months.

License Agreements

The Company has entered into license agreements with various parties under which it is obligated to make contingent and non-contingent payments (see Note 11).

Indemnification Agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and certain of its executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company is not currently aware of any indemnification claims and has not accrued any liabilities related to such obligations in its condensed consolidated financial statements as of March 31, 2023 or December 31, 2022.

Legal Proceedings

On February 13, 2023, the Company filed an Inter Partes Review (“IPR”) petition with the United States Patent and Trademark Office (“USPTO”) to challenge the validity of a certain issued U.S. Patent relating to FPI-2265. The Company cannot predict if the IPR will be instituted by the USPTO or, if instituted, the Company will prevail.

The Company is not a party to any other litigation and does not have contingency reserves established for any litigation liabilities. At each reporting date, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. The Company expenses as incurred the costs related to such legal proceedings.

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Related Party Transactions

3 Months Ended

Mar. 31, 2023

Related Party Transactions [Abstract]

Related Party Transactions

16.Related Party Transactions

The Company’s chief executive officer, founder and member of the board of directors, John Valliant, Ph.D., is a member of the board of directors at CPDC.

Besides the license agreements entered into with CPDC (see Note 11), the Company had also entered into a Master Services Agreement and a Supply Agreement with CPDC, under which CPDC provided services to the Company related to preclinical and manufacturing services, administrative support services and access to laboratory facilities. In connection with the Supply Agreement, the Company was obligated to pay CPDC an amount of $0.2 million per quarter, or $0.9 million in the aggregate per year, plus fees for materials, packaging and distribution of products supplied to the Company. The Company recognized expenses in connection with the services performed in the normal course of business under the Master Services Agreement and the Supply Agreement in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2022
Research and development expenses	$	990
General and administrative expenses		14
	$	1,004

In August 2022, CPDC transferred and assigned all agreements (including the Master Services Agreement and the Supply Agreement) other than the license agreements (see Note 11) with the Company to AtomVie, a third-party CDMO, who is not a related party. All terms and conditions of the agreements that were transferred and assigned will remain in full force and effect. CPDC’s performance obligations under these agreements will be undertaken by AtomVie.

During the three months ended March 31, 2022, the Company made payments to CPDC in connection with the services described above of $0.7 million. As of March 31, 2023 and December 31, 2022, there were no amounts due to CPDC by the Company in connection with the services described above.

In addition to costs incurred in connection with the services described above, the Company also reimbursed CPDC for purchases on the Company’s behalf from parties with which the Company did not have an account. During the three months ended March 31, 2022, the Company made payments to CPDC of less than $0.1 million for reimbursement of these pass-through costs.

During the three months ended March 31, 2022, the Company recorded $0.2 million of lab equipment purchased from CPDC which they acquired from third-party vendors on its behalf.

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Geographical Information

3 Months Ended

Mar. 31, 2023

Geographic Areas Long Lived Assets [Abstract]

Geographical Information

17.Geographical Information

The Company has operating companies in the United States and Canada. Information about the Company’s long-lived assets, consisting solely of property and equipment, net, by geographic region was as follows (in thousands):

	March 31, 2023		December 31, 2022
United States	$	433	$	465
Canada		4,708		4,166
	$	5,141	$	4,631

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Subsequent Events

3 Months Ended

Mar. 31, 2023

Subsequent Events [Abstract]

Subsequent Events

18.Subsequent Events

Securities Purchase Agreement and Registration Rights Agreement

On May 10, 2023, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with the purchasers named therein (the “Investors”).

Pursuant to the Purchase Agreement, the Company agreed to sell an aggregate of 4,784,689 of its common shares (the “Shares”), no par value per share (the “Common Shares”), at a purchase price of $4.18 per share, to the Investors for approximately $20.0 million in aggregate gross proceeds (collectively, the “Offering”). The Offering is expected to close on or about May 15, 2023.

On May 10, 2023, in connection with the Purchase Agreement, the Company entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with the Investors. Pursuant to the Registration Rights Agreement, the Company agreed to prepare and file a registration statement with the Securities and Exchange Commission (the “SEC”) within 45 calendar days after the closing of the Offering for purposes of registering the resale of the Shares and any Common Shares as a dividend or other distribution with respect to the Shares. The Company agreed to use its commercially reasonable efforts to cause this registration statement to be declared effective by the SEC within 60 days after the filing of the registration statement.

The Offering was exempt from registration pursuant to Section 4(a)(2) of the Securities Act and Regulation D promulgated thereunder, as a transaction by an issuer not involving a public offering. The Investors have acquired the securities not with a view to or for sale in connection with any distribution thereof, and appropriate legends have been affixed to the securities issued in this transaction.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the ordinary course of business. Since inception, the Company has funded its operations primarily with proceeds from sales of its convertible preferred shares, including borrowings under a convertible promissory note, which converted into convertible preferred shares, proceeds from sales of its former Irish subsidiary’s preferred exchangeable shares, proceeds from its initial public offering completed in June 2020, proceeds from its “at-the-market” equity offering program (see Note 9), proceeds from its loan and security agreement with Oxford Finance LLC executed in April 2022 (see Note 8), and proceeds from a private placement financing completed in February 2023 (see Note 9). The Company has incurred recurring losses since its inception, including net losses of $24.3 million and $19.9 million for the three months ended March 31, 2023 and 2022, respectively. In addition, as of March 31, 2023, the Company had an accumulated deficit of $306.2 million. The Company expects to continue to generate operating losses for the foreseeable future. As of the issuance date of these condensed consolidated financial statements, the Company expects that its cash, cash equivalents and investments will be sufficient to fund its operating expenses and capital expenditure requirements for at least the next 12 months. The future viability of the Company is dependent on its ability to raise additional capital to finance its operations.

Impacts of COVID-19 and Market Conditions on Our Business

Impacts of COVID-19 and Market Conditions on Our Business

The Company believes its financial results for the three months ended March 31, 2023 and year ended December 31, 2022 were not significantly impacted by the COVID-19 pandemic. The Company believes its hybrid and remote working arrangements have had limited impact on its ability to maintain internal operations during the three months ended March 31, 2023 and year ended December 31, 2022. Further, disruption of global financial markets and a recession or market correction, including as a result of the COVID-19 pandemic, the ongoing military conflict between Russia and Ukraine and the related sanctions imposed against Russia, and other global macroeconomic factors such as inflation and the recent banking industry volatility, could reduce the Company’s ability to access capital, which could, in the future, negatively affect its business and the value of its common shares.

Use of Estimates

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and

liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the accrual of research and development expenses, valuations of share-based awards, valuation allowance of deferred tax assets, and revenue recognition. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates when there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results may differ from those estimates or assumptions.

Unaudited Interim Financial Information

Unaudited Interim Financial Information

The accompanying condensed consolidated balance sheet as of March 31, 2023, the condensed consolidated statement of operations and comprehensive loss, and the condensed consolidated statement of shareholders’ equity, and the condensed consolidated statement of cash flows for the three months ended March 31, 2023 and 2022 are unaudited. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of March 31, 2023 and the results of its operations and its cash flows for the three months ended March 31, 2023 and 2022. The results for the three months ended March 31, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.

The accompanying balance sheet as of December 31, 2022 has been derived from the Company’s audited financial statements for the year ended December 31, 2022. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited interim condensed consolidated financial statements should be read in conjunction with the audited annual consolidated financial statements as of December 31, 2022, and notes thereto, which are included in the Company’s Annual Report on Form 10-K that was filed with the SEC on March 16, 2023.

Foreign Currency and Currency Translation

Foreign Currency and Currency Translation

The reporting currency of the Company is the U.S. dollar. The functional currency of the Company’s operating company in Canada and operating company in the U.S. is also the U.S. dollar. As a result, the Company records no cumulative translation adjustments related to translation of unrealized foreign exchange gains or losses.

For the remeasurement of local currencies to the U.S. dollar functional currency of the Canadian entity, assets and liabilities are translated into U.S. dollars at the exchange rate in effect on the balance sheet date, and income items and expenses are translated into U.S. dollars at the average exchange rate in effect during the period. Resulting transaction gains (losses) are included in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss, as incurred.

Adjustments that arise from exchange rate changes on transactions denominated in a currency other than the local currency are included in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss, as incurred.

During the three months ended March 31, 2023 and 2022, the Company recorded $(0.3) million and $0.3 million, respectively, of foreign currency (losses) gains in the condensed consolidated statements of operations and comprehensive loss.

Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents consist of standard checking accounts, money market accounts, and all highly liquid investments with an original maturity of three months or less at the date of purchase.

As of March 31, 2023 and December 31, 2022, the Company was required to maintain a separate cash balance of $0.2 million to collateralize corporate credit cards with a bank, which was classified as restricted cash, current, on its condensed consolidated balance sheets. The Company also maintained a $0.1 million guaranteed investment certificate to fulfill certain contractual obligations which was classified as restricted cash, current, as of March 31, 2023 and December 31, 2022.

In connection with the Company’s lease agreement entered into in October 2019 (see Note 14), the Company maintained a letter of credit of $1.5 million for the benefit of the landlord, which was reduced to $1.0 million during the three months ended March 31, 2023. As of March 31, 2023, $0.2 million and $0.8 million of the underlying cash balance collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash. As of December 31, 2022, $0.2 million and $1.0 million of the underlying cash balance

collateralizing this letter of credit was classified as restricted cash, current and non-current, respectively, on the Company’s condensed consolidated balance sheets based on the release date of the restrictions of this cash.

As of March 31, 2023 and December 31, 2022, the cash, cash equivalents and restricted cash of $54.9 million and $45.3 million, respectively, presented in the condensed consolidated statements of cash flows included cash and cash equivalents of $53.6 million and $43.9 million, respectively, and restricted cash of $1.3 million and $1.5 million, respectively.

Investments

Investments

The Company adopted ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”) effective January 1, 2023, and the adoption did not have a material impact on its condensed consolidated financial statements.

The Company determines the appropriate classification of its investments in debt securities at the time of purchase and re-evaluates such determination at each balance sheet date. The Company classifies its investments as current or non-current based on each instrument’s underlying maturity date. Investments with original maturities of greater than three months and remaining maturities less than twelve months are classified as current and are included in short-term investments in the condensed consolidated balance sheets. Investments with remaining maturities greater than one year from the balance sheet date are classified as non-current and are included in long-term investments in the condensed consolidated balance sheets. The Company’s investments are classified as available-for-sale, are reported at fair value and consist of U.S. and Canadian government agency debt securities, corporate bonds, and commercial paper. Unrealized gains and losses are included in other comprehensive (loss) income as a component of shareholders’ equity until realized. Amortization and accretion of premiums and discounts are recorded in interest income. Realized gains and losses on debt securities are included in other (expense) income, net.

The Company reviews its portfolio of available-for-sale debt securities, using both quantitative and qualitative factors, to determine if declines in fair value below cost have resulted from a credit-related loss or other factors. If the decline in fair value is due to credit-related factors, a loss is recognized in net loss, and if the decline in fair value is not due to credit-related factors, the loss is recorded in other comprehensive loss. No credit losses were recorded during the periods presented.

Deferred Offering Costs

Deferred Offering Costs

The Company capitalizes certain legal, professional accounting and other third-party fees that are directly associated with in-process equity financings as deferred offering costs until such financings are consummated. After consummation of an equity financing, these costs are recorded as a reduction of the proceeds from the offering in shareholders’ equity as a reduction of additional paid-in capital generated as a result of the offering. Should an in-process equity financing be abandoned, the deferred offering costs would be expensed immediately as a charge to operating expenses in the condensed consolidated statements of operations and comprehensive loss. The Company recorded $0.2 million of deferred offering costs as of March 31, 2023 and December 31, 2022 in other non-current assets.

Collaborative Arrangements

Collaborative Arrangements

The Company considers the nature and contractual terms of arrangements and assesses whether an arrangement involves a joint operating activity pursuant to which the Company is an active participant and is exposed to significant risks and rewards dependent on the commercial success of the activity. If the Company is an active participant and is exposed to significant risks and rewards dependent on the commercial success of the activity, the Company accounts for such arrangement as a collaborative arrangement under ASC 808, Collaborative Arrangements. ASC 808 describes arrangements within its scope and considerations surrounding presentation and disclosure, with recognition matters subjected to other authoritative guidance, in certain cases by analogy.

For arrangements determined to be within the scope of ASC 808 where a collaborative partner is not a customer for certain research and development activities, the Company accounts for payments received for the reimbursement of research and development costs as a contra-expense in the period such expenses are incurred. This reflects the joint risk sharing nature of these activities within a collaborative arrangement. The Company classifies payments owed or receivables recorded as other current liabilities or prepaid expenses and other current assets, respectively, in the Company’s consolidated balance sheets.

If payments from the collaborative partner to the Company represent consideration from a customer in exchange for distinct goods and services provided, then the Company accounts for those payments within the scope of ASC 606, Revenue from Contracts with Customers (“ASC 606”). Please refer to Note 3, “Collaboration Agreement” for additional details regarding the Company’s Strategic Collaboration Agreement with AstraZeneca UK Limited (“AstraZeneca”) (the “AstraZeneca Agreement”).

Revenue from Contracts with Customers

Revenue from Contracts with Customers

In accordance with ASC 606, the Company recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the Company expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that the Company determines are within the scope of ASC 606, it performs the following five steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations within the contract and (v) recognize revenue when (or as) the Company satisfies a performance obligation.

The Company only applies the five-step model to contracts when it determines that it is probable it will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer.

At contract inception, once the contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within the contract to determine whether each promised good or service is a performance obligation. The promised goods or services in the Company’s arrangements typically consist of a license to the Company’s intellectual property and/or research and development services. The Company may provide customers with options to additional items in such arrangements, which are accounted for separately when the customer elects to exercise such options, unless the option provides a material right to the customer. Performance obligations are promises in a contract to transfer a distinct good or service to the customer that (i) the customer can benefit from on its own or together with other readily available resources, and (ii) is separately identifiable from other promises in the contract. Goods or services that are not individually distinct performance obligations are combined with other promised goods or services until such combined group of promises meet the requirements of a performance obligation.

The Company determines transaction price based on the amount of consideration the Company expects to receive for transferring the promised goods or services in the contract. Consideration may be fixed, variable, or a combination of both. At contract inception for arrangements that include variable consideration, the Company estimates the probability and extent of consideration it expects to receive under the contract utilizing either the most likely amount method or expected amount method, whichever best estimates the amount expected to be received. The Company then considers any constraints on the variable consideration and includes in the transaction price variable consideration to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved.

The Company then allocates the transaction price to each performance obligation based on the relative standalone selling price and recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) control is transferred to the customer and the performance obligation is satisfied. For performance obligations which consist of licenses and other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

The Company records amounts as accounts receivable when the right to consideration is deemed unconditional. Amounts received, or that are unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract are recognized as deferred revenue. Amounts expected to be recognized as revenue within the 12 months following the balance sheet date are classified as the current portion of deferred revenue. Amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as deferred revenue, net of current portion.

The Company’s revenue generating arrangements typically include upfront license fees, milestone payments and/or royalties.

If a license is determined to be distinct from the other performance obligations identified in the arrangement, the Company recognizes revenue from nonrefundable, up-front fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. For licenses that are bundled with other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

At the inception of an agreement that includes research and development milestone payments, the Company evaluates each milestone to determine when and how much of the milestone to include in the transaction price. The Company first estimates the amount of the milestone payment that the Company could receive using either the expected value or the most likely amount approach. The Company primarily uses the most likely amount approach as this approach is generally most predictive for milestone payments with a binary outcome. Then, the Company considers whether any portion of the estimated amount is subject to the variable consideration constraint (that is, whether it is probable that a significant reversal of cumulative revenue would not occur upon resolution of the uncertainty). The Company updates the estimate of variable consideration included in the transaction price at each reporting date which

includes updating the assessment of the likely amount of consideration and the application of the constraint to reflect current facts and circumstances.

For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company will recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied).

For the three months ended March 31, 2023 and 2022, the Company recorded less than $0.1 million and $0.6 million, respectively, of revenue under collaboration agreements. Please refer to Note 3, “Collaboration Agreement” for additional details regarding revenue recognition under the AstraZeneca Agreement.

Business Combinations

Business Combinations

In determining whether an acquisition should be accounted for as a business combination or asset acquisition, the Company first determines whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this is the case, the single identifiable asset or the group of similar assets is not deemed to be a business, and is instead deemed to be an asset. If this is not the case, the Company then further evaluates whether the single identifiable asset or group of similar identifiable assets and activities includes, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. If so, the Company concludes that the single identifiable asset or group of similar identifiable assets and activities is a business.

The Company accounts for business combinations using the acquisition method of accounting. Application of this method of accounting requires that (i) identifiable assets acquired (including identifiable intangible assets) and liabilities assumed generally be measured and recognized at fair value as of the acquisition date and (ii) the excess of the purchase price over the net fair value of identifiable assets acquired and liabilities assumed be recognized as goodwill, which is not amortized for accounting purposes but is subject to testing for impairment at least annually. Acquired in-process research and development (“IPR&D”) is recognized at fair value and initially characterized as an indefinite-lived intangible asset, irrespective of whether the acquired IPR&D has an alternative future use. Transaction costs related to business combinations are expensed as incurred. Determining the fair value of assets acquired and liabilities assumed in a business combination requires management to use significant judgment and estimates, especially with respect to intangible assets.

During the measurement period, which extends no later than one year from the acquisition date, the Company may record certain adjustments to the carrying value of the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, all adjustments are recorded in the consolidated statements of operations as operating expenses or income.

To date, the Company has not recorded any acquisitions as a business combination.

Asset Acquisitions

Asset Acquisitions

The Company measures and recognizes asset acquisitions that are not deemed to be business combinations based on the cost to acquire the assets, which includes transaction costs. Goodwill is not recognized in asset acquisitions. In an asset acquisition, the cost allocated to acquire IPR&D with no alternative future use is charged to expense at the acquisition date.

Contingent consideration in asset acquisitions payable in the form of cash is recognized when payment becomes probable and reasonably estimable, unless the contingent consideration meets the definition of a derivative, in which case the amount becomes part of the asset acquisition cost when acquired. Contingent consideration payable in the form of a fixed number of the Company’s own shares is measured at fair value as of the acquisition date and recognized when the issuance of the shares becomes probable. Upon recognition of the contingent consideration payment, the amount is included in the cost of the acquired asset or group of assets, or, if related to IPR&D with no alternative future use, charged to expense.

Fair Value Measurements

Fair Value Measurements

Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried

at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable:

•Level 1—Quoted prices in active markets for identical assets or liabilities.

•Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data.

•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

The Company’s cash equivalents and investments are carried at fair value, determined according to the fair value hierarchy described above (see Note 4). The carrying values of the Company’s amounts due for Canadian harmonized sales tax, accounts payable and accrued expenses approximate their fair values due to the short-term nature of these liabilities.

Leases

Leases

The Company accounts for leases in accordance with ASC 842, Leases. At contract inception, the Company determines if an arrangement is or contains a lease. A lease conveys the right to control the use of an identified asset for a period of time in exchange for consideration. If determined to be or contain a lease, the lease is assessed for classification as either an operating or finance lease at the lease commencement date, defined as the date on which the leased asset is made available for use by the Company, based on the economic characteristics of the lease. For each lease with a term greater than twelve months, the Company records a right-of-use asset and lease liability.

A right-of-use asset represents the economic benefit conveyed to the Company by the right to use the underlying asset over the lease term. A lease liability represents the obligation to make lease payments arising from the lease. The Company records amortization of operating right-of-use assets and accretion of lease liabilities as a single lease cost on a straight-line basis over the lease term. The Company elected the practical expedient to not separate lease and non-lease components and therefore measures each lease payment as the total of the fixed lease and associated non-lease components. Lease liabilities are measured at the lease commencement date and calculated as the present value of the future lease payments in the contract using the rate implicit in the contract, when available. If an implicit rate is not readily determinable, the Company uses its incremental borrowing rate measured as the rate at which the Company could borrow, on a fully collateralized basis, a commensurate loan in the same currency over a period consistent with the lease term at the commencement date. Right-of-use assets are measured as the lease liability plus initial direct costs and prepaid lease payments, less lease incentives granted by the lessor. The lease term is measured as the noncancelable period in the contract, adjusted for any options to extend or terminate when it is reasonably certain the Company will extend the lease term via such options based on an assessment of economic factors present as of the lease commencement date. The Company elected the practical expedient to not recognize leases with a lease term of twelve months or less.

The Company assesses its right-of-use assets for impairment consistent with the assessment performed for long-lived assets used in operations. If an impairment is recognized on operating lease right-of-use assets, the lease liability continues to be recognized using the same effective interest method as before the impairment and the operating lease right-of-use asset is amortized over the remaining term of the lease on a straight-line basis.

The Company’s operating leases are presented in the condensed consolidated balance sheet as operating lease right-of-use assets, classified as noncurrent assets, and operating lease liabilities, classified as current and noncurrent liabilities based on the discounted lease payments to be made within the proceeding twelve months. Variable costs associated with a lease, such as maintenance and utilities, are not included in the measurement of the lease liabilities and right-of-use assets but rather are expensed when the events determining the amount of variable consideration to be paid have occurred.

Research, Development and Manufacturing Contract Costs and Accruals

Research, Development and Manufacturing Contract Costs and Accruals

The Company has entered into various research, development and manufacturing contracts with research institutions and other companies. These agreements are generally cancelable, and related costs are recorded as research and development expenses as incurred. The Company records accruals for estimated ongoing research, development and manufacturing costs. When billing terms under these contracts do not coincide with the timing of when the work is performed, the Company is required to make estimates of outstanding obligations to those third parties as of period end. Any accrual estimates are based on a number of factors, including the Company’s knowledge of the progress towards completion of the research, development and manufacturing activities, invoicing to date under the contracts, communication from the research institutions and other companies of any actual costs incurred during the period that have not yet been invoiced and the costs included in the contracts. Significant judgments and estimates may be made in determining the

accrued balances at the end of any reporting period. Actual results could differ from the estimates made by the Company. The historical accrual estimates made by the Company have not been materially different from the actual costs.

Comprehensive Loss

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in shareholders’ equity that result from transactions and economic events other than those with shareholders. For the three months ended March 31, 2023 and 2022, unrealized gains and losses on investments are included in other comprehensive (loss) income as a component of shareholders’ equity until realized.

Net Loss per Share

Net Loss per Share

Basic net income (loss) per share attributable to common shareholders is computed by dividing the net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted net income (loss) attributable to common shareholders is computed by adjusting net income (loss) attributable to common shareholders to reallocate undistributed earnings based on the potential impact of dilutive securities. Diluted net income (loss) per share attributable to common shareholders is computed by dividing the diluted net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period, including potential dilutive common shares. For purpose of this calculation, outstanding stock options, restricted stock units and warrants are considered potential dilutive common shares.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

The Company qualifies as “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected to “opt in” to the extended transition related to complying with new or revised accounting standards, which means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company will adopt the new or revised standard at the time nonpublic companies adopt the new or revised standard and will do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for private companies.

In June 2016, the FASB issued ASU 2016-13 which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with an expected loss model. It also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. In November 2018, the FASB issued ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, which narrowed the scope and changed the effective date for non-public entities for ASU 2016-13. The FASB subsequently issued supplemental guidance within ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief (“ASU 2019-05”). ASU 2019-05 provides an option to irrevocably elect the fair value option for certain financial assets previously measured at amortized cost basis. This guidance is effective for the Company for annual periods beginning after December 15, 2022, including interim periods within that fiscal year. The Company adopted ASU 2016-13 effective January 1, 2023, and the adoption did not have a material impact on its condensed consolidated financial statements.

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Collaboration Agreement (Tables)

3 Months Ended

Mar. 31, 2023

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Changes in the Contract Assets and Liabilities

The following table presents changes in the Company’s accounts receivable and contract liabilities for the three months ended March 31, 2023 (in thousands):

	Balance as of						Balance as of
	December 31, 2022		Additions		Deductions		March 31, 2023
Accounts receivable	$	61	$	28	$	—	$	89
Contract liabilities:
Deferred revenue	$	3,000	$	—	$	—	$	3,000

Schedule of Revenue Recognized

During the three months ended March 31, 2023 and 2022, the Company recognized the following revenue (in thousands):

	Three Months Ended March 31,
	2023		2022
Revenue recognized in the period from:
Amounts included in deferred revenue at the beginning of the period	$	—	$	438

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables present information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy used to determine such fair values (in thousands):

	Fair Value Measurements as of March 31, 2023 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	14,556	$	—	$	—	$	14,556
Investments:
Commercial paper		—		31,874		—		31,874
Corporate bonds		—		11,371		—		11,371
Canadian Government agency debt securities		—		15,987		—		15,987
U.S. Government agency debt securities		—		108,333		—		108,333
	$	14,556	$	167,565	$	—	$	182,121

	Fair Value Measurements as of December 31, 2022 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	4,241	$	—	$	—	$	4,241
U.S. Government agency debt securities		—		5,974		—		5,974
Investments:
Commercial paper		—		28,792		—		28,792
Corporate bonds		—		14,342		—		14,342
Municipal bonds		—		2,697		—		2,697
Canadian Government agency debt securities		—		19,911		—		19,911
U.S. Government agency debt securities		—		77,032		—		77,032
	$	4,241	$	148,748	$	—	$	152,989

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Investments (Tables)

3 Months Ended

Mar. 31, 2023

Investments Debt And Equity Securities [Abstract]

Schedule of Investments

Investments consisted of the following (in thousands):

	March 31, 2023
	Amortized Cost		Fair Value
Due within one year or less	$	156,339	$	156,227
Due after one year through three years		11,311		11,338
	$	167,650	$	167,565

	December 31, 2022
	Amortized Cost		Fair Value
Due within one year or less	$	127,441	$	127,013
Due after one year through three years		15,802		15,761
	$	143,243	$	142,774

Amortized Cost and Estimated Fair Value of Investments by Contractual Maturity

As of March 31, 2023, the amortized cost and estimated fair value of investments, by contractual maturity, was as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Current		Non-Current
Commercial paper	$	31,892	$	2	$	(20	)	$	31,874	$	31,874	$	—
Corporate bonds		11,386		1		(16	)		11,371		8,405		2,966
Canadian Government agency debt securities		16,009		47		(69	)		15,987		15,987		—
U.S. Government agency debt securities		108,363		89		(119	)		108,333		99,961		8,372
	$	167,650	$	139	$	(224	)	$	167,565	$	156,227	$	11,338

As of December 31, 2022, the amortized cost and estimated fair value of investments, by contractual maturity, was as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Current		Non-Current
Commercial paper	$	28,804	$	10	$	(22	)	$	28,792	$	28,792	$	—
Corporate bonds		14,354		4		(16	)		14,342		9,469		4,873
Municipal bonds		2,705		—		(8	)		2,697		2,697		—
Canadian Government agency debt securities		20,065		23		(177	)		19,911		19,911		—
U.S. Government agency debt securities		77,315		15		(298	)		77,032		66,144		10,888
	$	143,243	$	52	$	(521	)	$	142,774	$	127,013	$	15,761

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Prepaid Expenses and Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2023

Prepaid Expense And Other Assets Current [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Prepaid external research and development expenses	$	5,282	$	3,741
Prepaid insurance		629		1,295
Prepaid software subscriptions		612		402
Income tax receivable		—		386
Interest receivable		591		332
Other receivable due from AstraZeneca		938		352
Canadian harmonized sales tax receivable		923		592
Other		1,297		509
	$	10,272	$	7,609

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Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2023

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Accrued employee compensation and benefits	$	2,532	$	4,140
Accrued external research and development expenses		5,539		4,914
Accrued professional and consulting fees		1,782		916
Unearned grant income		435		591
Other		65		44
	$	10,353	$	10,605

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Debt (Tables)

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Summary of Long-term Debt, Net of Discount

Long-term debt, net of discount, consisted of the following (in thousands):

	March 31,
	2023
Principal amount of long‑term debt	$	35,000
Less: Current portion of long‑term debt		—
Long‑term debt, net of current portion		35,000
Accretion of Final Fee		195
Debt discount		(835	)
Long‑term debt, net of discount	$	34,360

Summary of Estimated Future Principal Payments Due

As of March 31, 2023, the estimated future principal payments due were as follows (in thousands):

Year Ending December 31,
2023 (nine months)	$	—
2024		—
2025		10,652
2026		18,261
2027		6,087
	$	35,000

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Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Value of Options Estimated on Date of Grant Using Black-Scholes Option Pricing Model

The following table presents, on a weighted-average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted:

	Three Months Ended March 31,
	2023			2022
Risk-free interest rate		3.85	%		1.72	%
Expected term (in years)		6.0			6.0
Expected volatility		65.2	%		65.7	%
Expected dividend yield		0	%		0	%

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity since December 31, 2022:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)		(in thousands)
Outstanding as of December 31, 2022		10,531,555		$	7.08		7.5	$	4,434
Granted		3,870,000			3.70
Exercised		—			—
Forfeited/cancelled		(456,539	)		7.44
Outstanding as of March 31, 2023		13,945,016		$	6.13		8.2	$	7,165
Vested and expected to vest as of March 31, 2023		13,853,950		$	6.09		8.2	$	7,165
Options exercisable as of March 31, 2023		5,614,768		$	6.68		6.7	$	5,192

Summary of Restricted Stock Unit Activity

The following table summarizes the Company’s restricted stock unit activity since December 31, 2022:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2022		65,500	$	5.91
Granted		—		—
Vested		—		—
Forfeited		—		—
Unvested as of March 31, 2023		65,500	$	5.91

Summary of Stock Based Compensation Expense

Share-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Research and development expenses	$	1,138	$	885
General and administrative expenses		2,011		1,748
	$	3,149	$	2,633

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Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Basic and Diluted Net Loss per Share

Basic and diluted net loss per share attributable to common shareholders was calculated as follows (in thousands, except share and per share amounts):

	Three Months Ended March 31,
	2023			2022
Numerator:
Net loss	$	(24,291	)	$	(19,909	)
Denominator:
Weighted-average common shares outstanding—basic and diluted		53,775,985			43,170,076
Net loss per share attributable to common shareholders —basic    and diluted	$	(0.45	)	$	(0.46	)

Summary of Potential Common Shares Excluded from Calculation of Diluted Net Loss per Share

The Company’s potentially dilutive securities, which include stock options and common share warrants, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted-average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common shareholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common shareholders for the periods indicated because including them would have had an anti-dilutive effect:

	Three Months Ended March 31,
	2023		2022
Options to purchase common shares		13,945,016		10,112,732
Unvested restricted stock units		65,500		—
Warrants to purchase common shares		196,120		—
		14,206,636		10,112,732

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Leases (Tables)

3 Months Ended

Mar. 31, 2023

Leases [Abstract]

Component of Operating Lease Cost

The components of operating lease cost, which are included within operating expenses in the accompanying condensed consolidated statements of operations and comprehensive loss, are as follows (in thousands):

	Three Months Ended March 31,
	2023		2022
Operating lease cost	$	496	$	366
Variable lease cost		22		13
Total lease cost	$	518	$	379

Summary of Supplemental Information of Operating Lease

The following table summarizes supplemental information for the Company’s operating leases:

	As of March 31,
	2023
Weighted-average remaining lease term (in years)		10.0
Weighted average discount rate		10.9	%
Cash paid for amounts included in the measurement of lease liabilities (in thousands)	$	437

Summary of Future Maturities of Operating Lease Liabilities

As of March 31, 2023, the future maturities of operating lease liabilities are as follows (in thousands):

Year Ending December 31,
2023 (nine months)	$	4,038
2024		3,116
2025		2,578
2026		2,338
2027		1,326
Thereafter		13,429
Total lease payments	$	26,825
Less: imputed interest		(11,120	)
Total lease liabilities	$	15,705

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Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2023

Related Party Transactions [Abstract]

Schedule of Recognized Expenses in Connection with Services Performed Under Master Services Agreement and Supply Agreement

The Company recognized expenses in connection with the services performed in the normal course of business under the Master Services Agreement and the Supply Agreement in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2022
Research and development expenses	$	990
General and administrative expenses		14
	$	1,004

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Geographical Information (Tables)

3 Months Ended

Mar. 31, 2023

Geographic Areas Long Lived Assets [Abstract]

Schedule of Long-lived Assets by Geographic Areas

The Company has operating companies in the United States and Canada. Information about the Company’s long-lived assets, consisting solely of property and equipment, net, by geographic region was as follows (in thousands):

	March 31, 2023		December 31, 2022
United States	$	433	$	465
Canada		4,708		4,166
	$	5,141	$	4,631

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Nature of the Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Formation and incorporation date	Dec. 31, 2014
Net loss	$ 24,291	$ 19,909
Accumulated deficit	$ 306,153		$ 281,862

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Oct. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Foreign currency transaction (losses) gains	$ (300,000)	$ 300,000
Restricted cash, current	419,000		$ 454,000
Letters of credit	1,000,000.0			$ 1,500,000
Restricted cash	849,000		1,018,000
Cash, cash equivalents and restricted cash	54,900,000		45,300,000
Cash and cash equivalents	53,600,000		43,900,000
Restricted Cash	1,300,000		1,500,000
Deferred offering costs	200,000		200,000
Astra Zeneca U K Limited [Member] | Strategic Collaboration Agreement [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue under collaboration agreement	100,000	$ 600,000
Collateralized Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, current	200,000		200,000
Restricted cash	800,000		1,000,000.0
Collateralize Credit Cards [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, current	200,000		200,000
Guaranteed Investment Certificate [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, current	$ 100,000		$ 100,000

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Collaboration Agreement - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Oct. 31, 2020 USD ($) Collaboration	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development expense		$ 15,877,000	$ 12,661,000
Prepaid expenses and other current assets		10,272,000		$ 7,609,000
Deferred revenue		333,000		333,000
Deferred revenue, non-current		2,667,000		2,667,000
AstraZeneca UK Limited [Member] | Strategic Collaboration Agreement [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Maximum amount for milestones payments to other party	$ 145,000,000.0
Upfront payment received		5,000,000.0
Maximum amount of payments to be received for development milestones		40,000,000.0
Deferred revenue		300,000
Deferred revenue, non-current		2,700,000
AstraZeneca UK Limited [Member] | Strategic Collaboration Agreement [Member] | Novel TATs And Combination Therapies [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of collaborative areas | Collaboration	2
AstraZeneca UK Limited [Member] | Novel TATs Collaboration [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development expense		1,600,000	700,000
Research and development expense offset		600,000	$ 300,000
Prepaid expenses and other current assets		$ 900,000		$ 400,000

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Collaboration Agreement - Schedule of Changes in the Contract Assets and Liabilities (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Contract assets:
Beginning balance	$ 61
Additions	28
Ending balance	89
Contract liabilities:
Beginning balance	3,000
Ending balance	$ 3,000

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Collaboration Agreement - Schedule of Revenue Recognized (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Contract With Customer Asset And Liability [Abstract]
Amounts included in deferred revenue at the beginning of the period	$ 438

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Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investments
Investments	$ 182,121	$ 152,989
Corporate Bond Securities [Member]
Investments
Investments	11,371	14,342
Municipal Bonds [Member]
Investments
Investments		2,697
Money Market Funds [Member]
Cash equivalents
Cash equivalents	14,556	4,241
Commercial Paper [Member]
Investments
Investments	31,874	28,792
Canadian Government Agency Debt Securities [Member]
Investments
Investments	15,987	19,911
U.S. Government Agency Debt Securities [Member]
Cash equivalents
Cash equivalents		5,974
Investments
Investments	108,333	77,032
Level 1
Investments
Investments	14,556	4,241
Level 1 | Money Market Funds [Member]
Cash equivalents
Cash equivalents	14,556	4,241
Level 2
Investments
Investments	167,565	148,748
Level 2 | Corporate Bond Securities [Member]
Investments
Investments	11,371	14,342
Level 2 | Municipal Bonds [Member]
Investments
Investments		2,697
Level 2 | Commercial Paper [Member]
Investments
Investments	31,874	28,792
Level 2 | Canadian Government Agency Debt Securities [Member]
Investments
Investments	15,987	19,911
Level 2 | U.S. Government Agency Debt Securities [Member]
Cash equivalents
Cash equivalents		5,974
Investments
Investments	$ 108,333	$ 77,032

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Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale securities, debt maturities, amortized cost [Abstract]
Amortized Cost, Due within one year or less	$ 156,339	$ 127,441
Amortized Cost, Due after one year through three years	11,311	15,802
Amortized Cost, Investments	167,650	143,243
Available-for-sale securities, debt maturities, Fair Value [Abstract]
Fair Value, Due within one year or less	156,227	127,013
Fair Value, Due after one year through three years	11,338	15,761
Fair value, Investments	$ 167,565	$ 142,774

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Investments - Amortized Cost and Estimated Fair Value of Investments by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Investments, Amortized Cost	$ 167,650	$ 143,243
Available-for-sale Investments, Gross Unrealized Gains	139	52
Available-for-sale Investments, Gross Unrealized Losses	(224)	(521)
Available-for-sale Investments, Fair Value	167,565	142,774
Available-for-sale Investments, Current	156,227	127,013
Available-for-sale Investments, Non Current	11,338	15,761
Commercial Paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Investments, Amortized Cost	31,892	28,804
Available-for-sale Investments, Gross Unrealized Gains	2	10
Available-for-sale Investments, Gross Unrealized Losses	(20)	(22)
Available-for-sale Investments, Fair Value	31,874	28,792
Available-for-sale Investments, Current	31,874	28,792
Corporate Bond Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Investments, Amortized Cost	11,386	14,354
Available-for-sale Investments, Gross Unrealized Gains	1	4
Available-for-sale Investments, Gross Unrealized Losses	(16)	(16)
Available-for-sale Investments, Fair Value	11,371	14,342
Available-for-sale Investments, Current	8,405	9,469
Available-for-sale Investments, Non Current	2,966	4,873
Municipal Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Investments, Amortized Cost		2,705
Available-for-sale Investments, Gross Unrealized Losses		(8)
Available-for-sale Investments, Fair Value		2,697
Available-for-sale Investments, Current		2,697
Canadian Government Agency Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Investments, Amortized Cost	16,009	20,065
Available-for-sale Investments, Gross Unrealized Gains	47	23
Available-for-sale Investments, Gross Unrealized Losses	(69)	(177)
Available-for-sale Investments, Fair Value	15,987	19,911
Available-for-sale Investments, Current	15,987	19,911
U.S. Government Agency Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Investments, Amortized Cost	108,363	77,315
Available-for-sale Investments, Gross Unrealized Gains	89	15
Available-for-sale Investments, Gross Unrealized Losses	(119)	(298)
Available-for-sale Investments, Fair Value	108,333	77,032
Available-for-sale Investments, Current	99,961	66,144
Available-for-sale Investments, Non Current	$ 8,372	$ 10,888

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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Prepaid Expense And Other Assets Current [Abstract]
Prepaid external research and development expenses	$ 5,282	$ 3,741
Prepaid insurance	629	1,295
Prepaid software subscriptions	612	402
Income tax receivable		386
Interest receivable	591	332
Other receivable due from AstraZeneca	938	352
Canadian harmonized sales tax receivable	923	592
Other	1,297	509
Prepaid expenses and other current assets	$ 10,272	$ 7,609

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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Payables And Accruals [Abstract]
Accrued employee compensation and benefits	$ 2,532	$ 4,140
Accrued external research and development expenses	5,539	4,914
Accrued professional and consulting fees	1,782	916
Unearned grant income	435	591
Other	65	44
Accrued expenses	$ 10,353	$ 10,605

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Debt - Summary of Long-term Debt, Net of Discount (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Principal amount of long-term debt	$ 35,000
Long-term debt, net of current portion	35,000
Accretion of Final Fee	195
Debt discount	(835)
Long-term debt, net of discount	$ 34,360	$ 34,233

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Debt - Additional Information (Detail) - USD ($)	Sep. 21, 2022	Apr. 04, 2022	Jan. 31, 2020
Debt Instrument [Line Items]
Number of shares issuable upon exercise of outstanding warrants (in shares)			749,197
Weighted-average exercise price per share (in dollars per share)			$ 8.10
Term Loans [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan facilities bear interest rate	7.90%	7.90%
Debt instrument, description of bear interest rate	The floating per annum rate of interest for borrowings under all four loan facilities was amended to the greater of (i) 8.00% and (ii) the sum of (a) 1-Month CME Term SOFR (as defined in the Second Amendment), (b) 0.10% and (c) 7.90%.Additionally, on March 30, 2023, the Company and the Lender entered into a Third Amendment to Loan and Security Agreement (together with the Loan Agreement, Consent and First Amendment to Loan and Security Agreement, and Second Amendment, the “Amended Loan Agreement”) to amend the availability of the Term C loan facility which is to be funded at the request of the Company, subject to certain conditions being met, no later than March 31, 2024, under the Amended Loan Agreement. As the terms of the amendments were not substantially different than the terms of the Loan Agreement, the amendments were accounted for as a debt modification. Issuance costs paid to the Lender in connection with the amendments were recorded as an additional debt discount and will be amortized to interest expense over the remaining term, together with unamortized original issuance costs, using the effective interest method.	borrowings under all three loan facilities bear interest at a floating per annum rate equal to the greater of (i) 8.00% and (ii) the sum of (a) the greater of (x) 1 Month LIBOR Rate and (y) 0.10% plus (b) 7.90%.
Obligated to pay final fee equal to percentage of aggregate amount of term loan funded		4.00%
Debt instrument, description of bear interest rate		The Company is obligated to pay a fee equal to 4.00% of the aggregate amount of the term loans funded (the “Final Fee”), to occur upon the earliest of (i) the maturity date, (ii) the acceleration of the term loans, and (iii) the prepayment of the term loans. The Company accretes the Final Fee that will be due at final repayment to outstanding debt by charges to interest expense over the term of the loans using the effective-interest method.The Company has the option to prepay all, but not less than all, of the outstanding principal balance of the term loans under the Loan Agreement. If the Company prepays all or a portion of the term loans prior to the maturity date, it is obligated to pay the Lender a prepayment fee based on a percentage of the outstanding principal balance of the loans, equal to 3.00% if the payment occurs on or before 12 months after the funding date of the applicable loan, 2.00% if the prepayment occurs more than 12 months after, but on or before 24 months after, the funding date of the applicable loan, or 1.00% if the prepayment occurs more than 24 months after, but on or before 36 months after, the funding date of the applicable loan, and no prepayment fee is required thereafter.
Default interest rate		5.00%
Loan covenant, minimum cash balances required		55.00%
Loan covenant, minimum cash balances required where cash balance accounts are not maintained		110.00%
Term Loans [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Term loan facilities bear interest rate		0.10%
Term Loans [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member] | SOFR [Member]
Debt Instrument [Line Items]
Term loan facilities bear interest rate	0.10%
Term Loans [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member] | Maximum [Member]
Debt Instrument [Line Items]
Term loans aggregate principal amount		$ 75,000,000.0
Term Loans [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member] | Minimum [Member] | Floating per Annum Rate [Member]
Debt Instrument [Line Items]
Term loan facilities bear interest rate	8.00%	8.00%
Term A and B Loan Facility [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Apr. 01, 2027
Term A B And C Loan Facility [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount		$ 75,000,000.0
Term A B C And D Loan Facility [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount	$ 75,000,000.0
Term A Loan Facility [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount		$ 25,000,000.0
Number of shares issuable upon exercise of outstanding warrants (in shares)		26,110
Weighted-average exercise price per share (in dollars per share)		$ 7.66
Warrants equal to percentage of initial amount funded		2.00%
Debt discount		$ 100,000
Term A Loan Facility [Member] | Loan Agreement [Member] | Funded on Closing Date [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount	10,000,000.0	10,000,000.0
Term A Loan Facility [Member] | Loan Agreement [Member] | Funded, One-time Basis at Any Time Prior to April 4, 2023 [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount		$ 15,000,000.0
Term B Loan Facility [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount	25,000,000.0
Number of shares issuable upon exercise of outstanding warrants (in shares)		170,010
Weighted-average exercise price per share (in dollars per share)		$ 2.94
Warrants equal to percentage of initial amount funded		2.00%
Additional warrants equal to percentage of loan funded		25.00%
Debt discount		$ 400,000
Term B Loan Facility [Member] | Loan Agreement [Member] | Funded, Subject to Certain Conditions Being Met, No Later Than June 30, 2023 [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount		$ 25,000,000.0
Term C Loan Facility [Member] | Loan Agreement [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Additional warrants equal to percentage of loan funded		2.00%
Warrant termination period		10 years
Term C Loan Facility [Member] | Loan Agreement [Member] | Funded, One-time Basis at Any Time Prior to April 4, 2023 [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount	15,000,000.0
Term C Loan Facility [Member] | Loan Agreement [Member] | Funded at Lender's Sole Discretion [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount		$ 25,000,000.0
Term D Loan Facility [Member] | Loan Agreement [Member] | Funded at Lender's Sole Discretion [Member] | Oxford Finance LLC [Member]
Debt Instrument [Line Items]
Term loan commitment amount	$ 25,000,000.0

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Debt - Summary of Estimated Future Principal Payments Due (Detail) $ in Thousands	Mar. 31, 2023 USD ($)
Debt Disclosure [Abstract]
2025	$ 10,652
2026	18,261
2027	6,087
Total	$ 35,000

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Equity - Additional Information (Detail) - USD ($)		1 Months Ended			3 Months Ended
	Feb. 13, 2023	Jan. 31, 2022	Jul. 31, 2021	Jan. 31, 2020	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Apr. 30, 2022
Class Of Stock [Line Items]
Number of shares agreed to sell					63,201,559	44,805,627
Common stock, no par value					$ 0	$ 0
Common stock, voting rights description					Each common share entitles the holder to one vote on all matters submitted to a vote of the Company’s shareholders.
Cash dividends					$ 0
Number of shares issuable upon exercise of outstanding warrants (in shares)				749,197
Weighted-average exercise price per share (in dollars per share)				$ 8.10
Expiration period				2 years
Warrant
Class Of Stock [Line Items]
Unexercised common share warrants expired		651,816
Class B Convertible Preferred Shares [Member]
Class Of Stock [Line Items]
Number of shares issuable upon exercise of outstanding warrants (in shares)				3,126,391
Weighted-average exercise price per share (in dollars per share)				$ 1.5154
Class B Preferred Exchangable Shares [Member]
Class Of Stock [Line Items]
Number of shares issuable upon exercise of outstanding warrants (in shares)				873,609
Weighted-average exercise price per share (in dollars per share)				$ 1.5154
Securities Purchase Agreement [Member]
Class Of Stock [Line Items]
Number of shares agreed to sell	17,648,596
Purchase price per share	$ 3.40
Net proceeds of common shares	$ 56,000,000.0
Common stock, no par value	$ 0
Open Market Sales Agreement [Member]
Class Of Stock [Line Items]
Net proceeds of common shares					$ 9,200,000
Number of common shares issued and sold					2,210,217
Open Market Sales Agreement [Member] | Maximum [Member]
Class Of Stock [Line Items]
Net proceeds of common shares			$ 100,000,000.0
Compensation percentage of gross proceeds			3.00%
Loan Agreement with Oxford Finance LLC
Class Of Stock [Line Items]
Number of shares issuable upon exercise of outstanding warrants (in shares)							170,010	26,110
Weighted-average exercise price per share (in dollars per share)							$ 2.94	$ 7.66
Percentage of initial funding							2.00%	2.00%
Initial funded amount							$ 25,000,000.0	$ 10,000,000.0
Common share warrants outstanding					196,120

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Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Jun. 18, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value for stock options exercised		$ 0.2
Weighted average grant-date fair value of stock options granted	$ 2.31	$ 4.55
Aggregate unrecognized share-based compensation expense	$ 27.4
Unrecognized share-based compensation expense, weighted average period expects for recognition	3 years
Number of shares exercised	0
Outside Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options, granted	2,443,800
Restricted Stock Units R S U [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate unrecognized share-based compensation expense	$ 0.3
Unrecognized share-based compensation expense, weighted average period expects for recognition	2 years 1 month 6 days
2020 Stock Option and incentive plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock reserved for future issuance	10,073,459			4,273,350
Stock incentive plan description	cumulatively increased each January 1 by 4% of the number of the Company’s common shares outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s compensation committee of the board of directors
Annual percentage increase in common stock reserved for future issuance	4.00%
Number of shares remained available for future grant	1,370,967
2017 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock reserved for future issuance	0		0
Number of shares remained available for future grant	0		0
2020 Employee Share Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock reserved for future issuance	1,746,220			450,169
Stock incentive plan description	the number of common shares that may be issued under the ESPP is automatically increased each January 1 by the lesser of (i) 900,338 common shares, (ii) 1% of the number of the Company’s common shares outstanding on the immediately preceding December 31 and (iii) such lesser number of shares as determined by the Company’s compensation committee of the board of directors.
Annual percentage increase in common stock reserved for future issuance	1.00%
Maximum annual increase in common stock reserved for future issuance	900,338
Shares, issued	43,857
Performance Based Vesting [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate unrecognized share-based compensation expense	$ 0.7

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Share-Based Compensation - Fair Value of Options Estimated on Date of Grant Using Black-Scholes Option Pricing Model (Detail)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	3.85%	1.72%
Expected term (in years)	6 years	6 years
Expected volatility	65.20%	65.70%
Expected dividend yield	0.00%	0.00%

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Share-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	10,531,555
Number of Shares, Granted	3,870,000
Number of Shares, Exercised	0
Number of Shares, Forfeited/cancelled	(456,539)
Number of Shares, Ending balance	13,945,016	10,531,555
Number of Shares, Options vested and expected to vest	13,853,950
Number of Shares, Options exercisable	5,614,768
Weighted Average Exercise Price, Beginning balance	$ 7.08
Weighted Average Exercise Price, Granted	3.70
Weighted Average Exercise Price, Forfeited/cancelled	7.44
Weighted Average Exercise Price, Ending balance	6.13	$ 7.08
Weighted Average Exercise Price, Options vested and expected to vest	6.09
Weighted Average Exercise Price, Options exercisable	$ 6.68
Weighted-Average Remaining Contractual Term, Outstanding	8 years 2 months 12 days	7 years 6 months
Weighted Average Remaining Contractual Term, Options vested and expected to vest	8 years 2 months 12 days
Weighted Average Remaining Contractual Term, Options exercisable	6 years 8 months 12 days
Aggregate Intrinsic Value	$ 7,165	$ 4,434
Aggregate Intrinsic Value, Options vested and expected to vest	7,165
Aggregate Intrinsic Value, Options exercisable	$ 5,192

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Share-Based Compensation - Summary of Restricted Stock Unit Activity (Detail)	Mar. 31, 2023 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance | shares	65,500
Number of Shares, Ending balance | shares	65,500
Weighted - Average Grant Date Fair Value, Beginning balance | $ / shares	$ 5.91
Weighted - Average Grant Date Fair Value, Ending balance | $ / shares	$ 5.91

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Share-Based Compensation - Summary of Stock Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 3,149	$ 2,633
Research and Development Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	1,138	885
General and Administrative Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2,011	$ 1,748

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License Agreements and Asset Acquisitions - Additional Information (Detail) € in Millions			1 Months Ended	3 Months Ended				12 Months Ended
	Feb. 10, 2023 USD ($)	Aug. 12, 2021 CAD ($)	Aug. 31, 2022 USD ($) shares	Mar. 31, 2023 USD ($) shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2021 EUR (€)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2023 CAD ($) shares	Jun. 09, 2022 USD ($)	Mar. 31, 2021 EUR (€) shares
Research And Development Arrangement Contract To Perform For Others [Line Items]
Research and development				$ 15,877,000	$ 12,661,000
Assets held				$ 266,551,000				$ 219,064,000
Common stock, shares issued | shares				63,201,559				44,805,627			63,201,559
RadioMedix Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Option fee								$ 800,000
Option exercise fee	$ 1,500,000
RadioMedix Agreement [Member] | Maximum [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Additional amount to be paid on net sales	50,000,000.0
Additional amount to be paid upon achievement of clinical and regulatory milestones	10,500,000
Increase in regulatory milestone payments	$ 4,000,000.0
RadioMedix Agreement [Member] | Research and Development Expense [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Option exercise fee				$ 1,500,000
CPDC [Member] | Research and License Agreement [Member] | Research and Development Expense [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Milestone payment				0	0
ImmunoGen [Member] | Research and License Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront license fee paid				200,000
ImmunoGen [Member] | Research and License Agreement [Member] | Maximum [Member] | Development And Regulatory Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development				15,000,000.0
ImmunoGen [Member] | Research and License Agreement [Member] | Maximum [Member] | Sales Based Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development				35,000,000.0
ImmunoGen [Member] | Research and License Agreement [Member] | Research and Development Expense [Member] | Development And Regulatory Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront license fee paid				0	0
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Additional amount payable under agreement				$ 3,500,000
Non-voting common stock, issued | shares				313,359							313,359
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Development And Regulatory Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development				$ 22,500,000
Non-voting common stock, issued | shares				156,679							156,679
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Sales Based Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development				$ 42,000,000.0
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Phase1
Research And Development Arrangement Contract To Perform For Others [Line Items]
Milestone payment			$ 2,000,000.0
Common stock, shares issued | shares			156,679
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Maximum [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Potential future payment as percentage of amount the Company receives under sublicense agreements				30.00%							30.00%
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Minimum [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Potential future payment as percentage of amount the Company receives under sublicense agreements				10.00%							10.00%
Rainier Therapeutics, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Research and Development Expense [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront license fee paid										$ 1,000,000.0
Research and development				$ 0	0
Additional amount payable under agreement						$ 3,500,000
Genentech, Inc. [Member] | Asset Acquisition and License Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Research and development				0	0
Genentech, Inc. [Member] | Asset Acquisition and License Agreement [Member] | Maximum [Member] | Sales Based Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development				44,000,000.0
TRIUMF Innovations Inc. [Member] | Asset Acquisition and License Agreement [Member] | Accounts Payable [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Total milestone payment achieved				2,300,000							$ 3,000,000.0
TRIUMF Innovations Inc. [Member] | Asset Acquisition and License Agreement [Member] | Development And Regulatory Milestone [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development											5,000,000.0
TRIUMF Innovations Inc. [Member] | Asset Acquisition and License Agreement [Member] | Maximum [Member] | Actinium-225 [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development		$ 15,000,000.0
TRIUMF Innovations Inc. [Member] | Asset Acquisition and License Agreement [Member] | Minimum [Member] | Actinium-225 [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Percentage of annual requirements		50.00%
TRIUMF Innovations Inc. [Member] | Asset Acquisition and License Agreement [Member] | Research and Development Expense [Member] | Maximum [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Amortization expenses				100,000	0
TRIUMF Innovations Inc. [Member] | Amended Collaboration Agreement [Member] | Accounts Payable [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Total milestone payment achieved				6,600,000							$ 8,500,000
Milestone payment paid								2,600,000	$ 3,900,000
TRIUMF Innovations Inc. [Member] | Amended Collaboration Agreement [Member] | Research and Development Expense [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Amortization expenses				300,000	200,000
TRIUMF Innovations Inc. [Member] | Collaboration Agreement and Amended Collaboration Agreement [Member] | Prepaid Expenses and Other Current Assets [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Milestone payment				2,100,000
TRIUMF Innovations Inc. [Member] | Collaboration Agreement and Amended Collaboration Agreement [Member] | Other Non-current Assets [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Milestone payment				2,100,000
NewCo [Member] | Asset Acquisition and License Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Assets held				0
Ipsen Pharma S A S | Asset Acquisition and License Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront license fee paid						$ 800,000	€ 0.6
Research and development				$ 0	$ 0
Common stock, shares issued | shares						600,000							600,000
Additional amount to be paid upon achievment of development and regulatory milestone | €							67.5
Additional amount to be paid on net sales | €													€ 350.0
Maximum amount of payments to be received for development milestones | €							€ 70.0
Ipsen Pharma S A S | Asset Acquisition and License Agreement [Member] | Maximum [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Decrease in percentage of royalties				50.00%
Collaboration And Supply Agreement With Niowave Inc [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development												$ 5,000,000.0
Collaboration And Supply Agreement With Niowave Inc [Member] | Asset Acquisition and License Agreement [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Performance milestone payments based on successful development				$ 2,800,000
Research and development				200,000
Milestone payment paid				$ 1,900,000				$ 900,000

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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Loss Carryforwards [Line Items]
Income tax provision (benefit)	$ (11,000)	$ (55,000)
Duration of research conducted with in united states	5 years
Duration of research conducted in abroad	15 years
Canada [Member]
Operating Loss Carryforwards [Line Items]
Income tax provision (benefit)	$ 0	0
Tax credit carryforward amount	0	$ 0
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Income tax provision (benefit)	$ (100,000)

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Net Loss per Share - Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net loss	$ (24,291)	$ (19,909)
Denominator:
Weighted-average common shares outstanding-basic	53,775,985	43,170,076
Weighted-average common shares outstanding-diluted	53,775,985	43,170,076
Net loss per share attributable to common shareholders — basic	$ (0.45)	$ (0.46)
Net loss per share attributable to common shareholders — diluted	$ (0.45)	$ (0.46)

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Net Loss per Share - Summary of Potential Common Shares Excluded from Calculation of Diluted Net Loss per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from calculation of diluted net loss per share	14,206,636	10,112,732
Options to purchase common shares [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from calculation of diluted net loss per share	13,945,016	10,112,732
Unvested Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from calculation of diluted net loss per share	65,500
Warrant Liability [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from calculation of diluted net loss per share	196,120

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Leases - Additional Information (Details) $ in Thousands, $ in Millions				1 Months Ended			3 Months Ended
	Jan. 12, 2022 USD ($)	Jun. 01, 2021 USD ($)	Jun. 01, 2021 CAD ($)	Feb. 28, 2023 USD ($)	Mar. 31, 2021 USD ($)	Oct. 31, 2019 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Lessee Lease Description [Line Items]
Operating lease expiration period	Aug. 31, 2030	Jun. 30, 2038	Jun. 30, 2038	Mar. 31, 2025		Feb. 28, 2026	Aug. 31, 2030
Operating lease additional lease period		5 years	5 years				5 years
Operating lease termination notice period							12 months
Operating lease, option to extend by lessee							false
Lessee, operating lease, description							In August 2018, the Company entered into an operating lease for office space in Hamilton, Ontario. This lease was amended in September 2020 (“New Lease Commencement Date”) and expires in August 2030 with a termination option upon twelve months written notice any time after the fifth anniversary of the New Lease Commencement Date. If the termination option is not exercised, the Company may exercise a renewal option to extend the term for an additional five-year period through August 2035. As the Company is not reasonably certain to extend the lease beyond the allowable termination date, the lease term was determined to end in August 2026 for the purposes of measuring this lease.
Restricted cash							$ 1,300		$ 1,500
Restricted cash, current							419		454
Restricted cash, noncurrent							$ 849		1,018
Allowance for lease improvements					$ 200
Lease improvements and expansions, description							The rental payments for the Expansion Space commenced on January 1, 2022.
Lease, option to extend	The lease has a five-year renewal option upon twelve months written notice prior to the expiration of the original term	The Company currently expects the rent for the manufacturing facility to commence in June 2023, approximately two months after the delivery date of the premises. The Company currently expects the lease end date for the manufacturing facility to be in June 2038. The lease has a five-year renewal option, which the Company is not reasonably certain to exercise and therefore was not included in the expected lease term.	The Company currently expects the rent for the manufacturing facility to commence in June 2023, approximately two months after the delivery date of the premises. The Company currently expects the lease end date for the manufacturing facility to be in June 2038. The lease has a five-year renewal option, which the Company is not reasonably certain to exercise and therefore was not included in the expected lease term.				The lease end date for the Original Premises and the Expansion Premises is April 30, 2027, with no option to extend the lease term.
Operating lease right-of-use assets	$ 300			$ 2,200	900		$ 17,840		5,684
Increase in operating lease liability	$ 300			$ 1,500	$ 1,200		15,705
Operating right-of-use asset obtained in exchange for an operating lease liability							12,560	$ 339
Hamilton Ontario [Member]
Lessee Lease Description [Line Items]
Operating lease right-of-use assets							10,400
Operating right-of-use asset obtained in exchange for an operating lease liability							8,600
Other Non-current Assets [Member] | Hamilton Ontario [Member]
Lessee Lease Description [Line Items]
Prepaid rent							2,100
Canada, Dollars
Lessee Lease Description [Line Items]
Initial direct cost expense			$ 2.5
United States of America, Dollars
Lessee Lease Description [Line Items]
Initial direct cost expense		$ 2,100
Letter of Credit [Member]
Lessee Lease Description [Line Items]
Restricted cash						$ 1,500	1,000
Restricted cash, current							200		200
Restricted cash, noncurrent							$ 800		$ 1,000

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Leases - Component of Operating Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lease Cost [Abstract]
Operating lease cost	$ 496	$ 366
Variable lease cost	22	13
Total lease cost	$ 518	$ 379

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Leases - Summary of Supplemental Information, Operating Lease (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Leases [Abstract]
Weighted-average remaining lease term (in years)	10 years
Weighted average discount rate	10.90%
Cash paid for amounts included in the measurement of lease liabilities (in thousands)	$ 437

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Leases - Summary of Future Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Feb. 28, 2023	Jan. 12, 2022	Mar. 31, 2021
Operating Lease Liabilities Payments Due [Abstract]
2023 (nine months)	$ 4,038
2024	3,116
2025	2,578
2026	2,338
2027	1,326
Thereafter	13,429
Total lease payments	26,825
Less: imputed interest	(11,120)
Total lease liabilities	$ 15,705	$ 1,500	$ 300	$ 1,200

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Non-cancelable minimum purchase commitments	$ 0.4
CPDC [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cancelable minimum purchase commitments	0.5
CPDC [Member] | Third Party Contract [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-cancelable minimum purchase commitments	$ 0.3

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Related Party Transactions - Additional Information (Detail) - CPDC [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2023
Related Party Transaction [Line Items]
Payment related to supply agreement per quarter		$ 0.2
Payment related to supply agreement aggregate per year		$ 0.9
Amounts of transaction related to service	$ 0.7
Payment for lab equipment	0.2
Maximum [Member]
Related Party Transaction [Line Items]
Payment for reimbursement of pass through costs	$ 0.1

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Related Party Transactions - Schedule of Recognized Expenses in Connection with Services Performed Under Master Services Agreement and Supply Agreement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Research and development expenses	$ 15,877	$ 12,661
General and administrative expenses	$ 9,006	8,449
CPDC [Member]
Related Party Transaction [Line Items]
Research and development expenses		990
General and administrative expenses		14
Total operating expenses		$ 1,004

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Geographical Information - Schedule of Long-lived Assets by Geographic Areas (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 5,141	$ 4,631
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	433	465
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 4,708	$ 4,166

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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	May 10, 2023	Feb. 13, 2023	Mar. 31, 2023	Dec. 31, 2022
Subsequent Event [Line Items]
Number of shares agreed to sell			63,201,559	44,805,627
Common stock, no par value			$ 0	$ 0
Securities Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of shares agreed to sell		17,648,596
Common stock, no par value		$ 0
Purchase price per share		$ 3.40
Aggregate gross proceeds		$ 56.0
Subsequent Event [Member] | Securities Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of shares agreed to sell	4,784,689
Common stock, no par value	$ 0
Purchase price per share	$ 4.18
Aggregate gross proceeds	$ 20.0