10-Q

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 and post 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.

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 August 10, 2023, the registrant had 4,271,759 shares of common stock, $0.0001 par value, outstanding.

See accompanying notes to the unaudited condensed consolidated financial statements.

1. Description of Business and Basis of Presentation

Description of Business

Histogen Inc. (the “Company,” “Histogen,” “we,” or the “combined company”), formerly known as Conatus Pharmaceuticals Inc. (“Conatus”), was incorporated in the state of Delaware on July 13, 2005. The Company is a clinical-stage therapeutics company focused on developing potential first-in-class clinical and preclinical small molecule pan-caspase and caspase selective inhibitors that protect the body’s natural process to restore immune function.

On January 28, 2020, the Company, then operating as Conatus, entered into an Agreement and Plan of Merger and Reorganization, as amended (the “Merger Agreement”), with privately-held Histogen, Inc. (“Private Histogen”) and Chinook Merger Sub, Inc., a wholly-owned subsidiary of the Company (“Merger Sub”). Under the Merger Agreement, Merger Sub merged with and into Private Histogen, with Private Histogen surviving as a wholly-owned subsidiary of the Company (the “Merger”). On May 26, 2020, the Merger was completed. Conatus changed its name to Histogen Inc., and Private Histogen, which remains as a wholly-owned subsidiary of the Company, changed its name to Histogen Therapeutics Inc. On May 27, 2020, the combined company’s common stock began trading on The Nasdaq Capital Market under the ticker symbol “HSTO”.

Recent Developments

On July 5, 2023, the Company announced that it had completed a review of its business, including the status of programs, resources and capabilities, and initiated a process to explore strategic alternatives with the intent to enhance shareholder value. The Company has paused its product development activities and taken other steps to reduce operating costs in order to preserve cash as it explores these strategic alternatives and has engaged Roth Capital Partners, LLC, to act as its strategic advisor. Potential strategic alternatives that may be explored or evaluated as part of this process include an acquisition, merger, reverse merger, other business combination, sale of assets, financing alternatives, licensing, or other strategic transactions involving the Company. The Company’s Board of Directors has not set a timetable for the conclusion of this review, nor has it made any definitive decisions related to taking any further actions or potential strategic options at this time or at all. Despite the undertaking of this process, the Company may not be successful in completing a transaction, and even if a transaction is completed, it may not ultimately deliver the anticipated benefits of enhanced shareholder value.

On August 7, 2023, the Company entered into a Lease Termination Agreement (the “Lease Termination Agreement”) for its headquarters and laboratory operating lease, pursuant to which the Company and the landlord mutually agreed to accelerate the termination date to August 31, 2023, subject to a termination fee paid by the Company of approximately $1.0 million. The Company entered into the Lease Termination Agreement primarily for the purpose of reducing the overall cash commitment and long-term liabilities related to the lease as part of the Company’s efforts to pursue potential strategic alternatives. The lease termination will eliminate the Company’s right-of-use assets and operating lease liabilities balance during the third quarter of 2023 and result in the cancellation of the letter of credit during the fourth quarter of 2023, which will reclass $0.3 million of restricted cash to cash and cash equivalents on the accompanying condensed consolidated balance sheets.

Reverse Stock Split

On June 2, 2022, the Company’s Board of Directors approved a one-for-twenty reverse stock split of its then outstanding common stock (the “Reverse Stock Split”) with any fractional shares resulting from the Reserve Stock Split rounded down to the next whole share of common stock. The par value and the authorized shares of the common stock were not adjusted as a result of the Reverse Stock Split. All references to share and per share amounts for all periods presented in the condensed consolidated financial statements have been retrospectively restated to reflect this Reverse Stock Split. Additionally, all rights to receive shares of common stock under outstanding warrants, options, and restricted stock units (“RSUs”) were adjusted to give effect of the reverse stock split. Furthermore, remaining shares of common stock available for future issuance under stock-based payment award plans and employee stock purchase plans were adjusted to give effect to the Reverse Stock Split.

Liquidity and Going Concern

The Company has incurred operating losses and negative cash flows from operations and had an accumulated deficit of $93.8 million as of June 30, 2023. The Company expects operating losses and negative cash flows from operations to continue for the foreseeable

future. As of June 30, 2023, the Company had $7.3 million in cash and cash equivalents, which will not be sufficient to sustain its operations for at least twelve months following the date these condensed consolidated financial statements are issued.

On June 5, 2023, the Company received a letter from the Listing Qualifications Department of the Nasdaq Stock Market (“Nasdaq”) indicating that, for the last thirty consecutive business days, the bid price for our common stock had closed below the minimum $1.00 per share requirement for continued listing on The Nasdaq Capital Market pursuant to Nasdaq Listing Rule 5550(a)(2). The Company has been provided an initial period of 180 calendar days, or until December 4, 2023, to regain compliance pursuant to Nasdaq Listing Rule 5810(c)(3)(A).

The Company has not yet established ongoing sources of revenues sufficient to cover its operating costs and will need to continue to raise additional capital to support its future operating activities, including progression of its development programs, preparation for potential commercialization, and other operating costs. The Company's plans with regard to these matters include their primary focus of evaluation of strategic alternatives which may include an acquisition, merger, reverse merger, other business combination, sale of assets, financing alternatives, licensing, or other strategic transactions involving the company. The Company’s Board of Directors has not set a timetable for the conclusion of this review, nor has it made any definitive decisions related to taking any further actions or potential strategic options at this time or at all. Despite the undertaking of this process, the Company may not be successful in completing a transaction, and their Board of Directors may decide to pursue a dissolution and liquidation of the Company. Even if a transaction is completed, it may not ultimately provide sufficient capital to continue operations or deliver the anticipated benefits of enhanced shareholder value. The aforementioned factors raise substantial doubt about the Company's ability to continue as a going concern.

The condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. Based on the current business plan to pursue strategic alternatives paths and related operating budget, there is substantial doubt about the Company’s ability to continue as a going concern within one year from the date the condensed consolidated financial statements are issued. The condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that may result from the outcome of this uncertainty.

Basis of Presentation and Principles of Consolidation

The condensed consolidated financial statements include the accounts of the Company and its controlled subsidiaries, including Histogen Therapeutics, Inc., and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). All intercompany balances and transactions have been eliminated upon consolidation.

The Company acquired Centro De Investigacion de Medicina Regenerativa, S.A. de C.V. (“CIMRESA”), a company in Mexico, during 2018 to facilitate a potential clinical development program for HST-001, or hair stimulating complex (“HSC”). This was a wholly-owned subsidiary intended to pursue registration with the COFEPRIS (Mexico equivalent to Food and Drug Administration). Since the Company acquired CIMRESA in 2018, there have been no financial or operational activities. On January 17, 2023, the Company sold the wholly-owned subsidiary, CIMRESA, and deconsolidated the former subsidiary, resulting in a gain during the three and six months ended June 30, 2023.

The Company holds a majority interest in Adaptive Biologix, Inc. (“AB”, formerly Histogen Oncology, LLC). AB was formed to develop and market applications for the treatment of cancer. The Company consolidates AB into its condensed consolidated financial statements (refer to Note 2 for further information).

Unaudited Interim Financial Information

The unaudited condensed consolidated financial statements for the three and six months ended June 30, 2023 and 2022 have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and GAAP. Accordingly, these condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of Management, these unaudited interim condensed consolidated financial statements contain all adjustments necessary, all of which are of a normal and recurring nature, to present fairly the Company’s financial position, results of operations, and cash flows. Interim results are not necessarily indicative of results for a full year or future periods. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes thereto for the year ended December 31, 2022 included in the Annual Report on Form 10-K that the Company filed with the SEC on March 9, 2023.

2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and the disclosure of contingent assets and liabilities and contingencies at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the periods presented. Management believes that these estimates and assumptions are reasonable, however, actual results may differ and could have a material effect on future results of operations and financial position. Though the impact of the COVID-19 pandemic to our business and operating results presents additional uncertainty, the Company continues to use the best information available to them in their significant accounting estimates.

Significant estimates and assumptions include those related to the useful lives of property and equipment, discount rates used in recognizing contracts containing leases, unrecognized tax benefits, and volatility used for stock-based compensation option pricing. Actual results may materially differ from those estimates.

Variable Interest Entities

The Company determined that AB is a variable interest entity (“VIE”) and that the Company is its primary beneficiary. The Company holds greater than 50% of the shares and has the authority to manage the business and affairs of the VIE. AB’s other shareholder does not have a controlling interest.

A VIE is typically an entity for which the Company has less than a 100% equity interest but controls the decision making over the business and affairs of the entity, directs the decisions driving the economic performance of such entity and participates in the profit and losses of such an entity. The Company weighed both quantitative and qualitative information about the different risks and reward characteristics of each entity and the significance of that entity to the consolidating group in the aggregate.

Segment Reporting

Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker, the Chief Executive Officer, in making decisions regarding resource allocation and assessing performance. The Company views its operations and manages its business as one operating segment.

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments purchased with an original maturity date of ninety days or less to be cash equivalents. Cash and cash equivalents include cash in readily available checking, money market accounts and brokerage accounts.

The Company’s current restricted cash consists of cash held as collateral for a letter of credit issued as a security deposit for the lease of the Company’s headquarters and is required to be held throughout the lease term.

Risks and Uncertainties

Credit Risk

At certain times throughout the year, the Company may maintain deposits in federally insured financial institutions in excess of federally insured limits.

Customer Risk

During the three and six months ended June 30, 2023 and 2022, one customer accounted for 100% of total revenues.

Accounts Receivable

Accounts receivable are generally due within 30 days and are recorded net of the allowance for doubtful accounts, if any. Management considers all accounts receivable to be recoverable, and accordingly, no provision for doubtful accounts was recorded at December 31, 2022. No accounts receivable are recorded as of June 30, 2023 on the accompanying condensed consolidated balance sheets.

Property and Equipment

Property and equipment are reported net of accumulated depreciation and amortization and are comprised of office furniture and equipment, lab and manufacturing equipment, and leasehold improvements. Ordinary maintenance and repairs are charged to expense, while expenditures that extend the physical or economic life of the assets are capitalized. Furniture and all equipment are depreciated over their estimated useful lives, or five years, using the straight-line method. Software is amortized over its estimated useful lives, or three years, using the straight-line method. Leasehold improvements are amortized over their estimated useful lives and limited by the remaining term of the building lease, using the straight-line method.

Valuation of Long-Lived Assets

Long-lived assets to be held and used, including property and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. As of June 30, 2023, the Company has not recognized any impairment to long-lived assets.

Comprehensive Loss

The Company is required to report all components of comprehensive loss, including net loss, in the accompanying condensed consolidated financial statements in the period in which they are recognized. Comprehensive loss is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources, including unrealized gains and losses on investments and foreign currency translation adjustments. Net loss and comprehensive loss were the same for all periods presented.

Revenue Recognition

License Revenue

The Company records revenue in accordance with ASC 606, Revenue from Contracts with Customers, whereby revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration expected to be received in exchange for those goods or services. A five-step model is used to achieve the core principle: (1) identify the customer contract, (2) identify the contract’s performance obligations, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations and (5) recognize revenue when or as a performance obligation is satisfied. The Company applies the five-step model to contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. The Company applies the revenue recognition standard, including the use of any practical expedients, consistently to contracts with similar characteristics and in similar circumstances (refer to Note 5 for further information).

Grant Awards

In September 2020, the Company was approved for a grant award from the U.S. Department of Defense (“DoD”) in the amount of approximately $2.0 million to partially fund the Company’s Phase 1/2 clinical trial of HST-003 for regeneration of cartilage in the knee. The Company applies International Accounting Standard (“IAS”) 20, Accounting for Government Grants and Disclosure of Government Assistance, by analogy as there is no existing authoritative guidance under GAAP. Under the terms of the award, the DoD will reimburse the Company for certain allowable costs. The period of performance for the grant award substantially expires in September 2025 and is subject to annual and quarterly reporting requirements. As the DoD grant is a cost-type (reimbursement) grant, the Company must incur program expenses in accordance with the Statement of Work and approved budget in order to be reimbursed by the DoD. The Company will recognize funding received from the grant award as a reduction of research and development expenses in the period in which qualifying expenses have been incurred, as the Company is reasonably assured that the expenses will be reimbursed and the funding is collectible. For the three and six months ended June 30, 2023 and 2022, qualifying expenses totaling $0 and $0.1 million have been incurred with a corresponding reduction of research and development expenses related to the award, respectively. As of June 30, 2023 and December 31, 2022, $0 and $0.1 million was included in accounts receivable within the condensed consolidated balance sheets with respect to the award, respectively. The Company made the decision in December 2022 to terminate the study for futility regarding patient recruitment and redirect efforts and funding away from HST-003 to other product candidates. As of March 31, 2023, the Company had completed its HST-003 clinical study close-out activities and early terminated the grant award.

Research and Development Expenses

All research and development costs are charged to expense as incurred. Research and development expenses primarily include (i) payroll and related costs associated with research and development performed, (ii) costs related to clinical and preclinical testing of the Company’s technologies under development, and (iii) other research and development costs, net of reimbursable research and development costs incurred under the DoD grant.

General and Administrative Expenses

General and administrative expenses represent personnel costs for employees involved in general corporate functions, including finance, accounting, legal and human resources, among others. Additional costs included within general and administrative expenses consist of professional fees for legal (including patent costs), audit and other consulting services, travel and entertainment, recruiting, facility costs, general information technology costs, depreciation and amortization, and other general corporate overhead expenses.

Patent Costs

The Company expenses all costs as incurred in connection with patent applications (including direct application fees, and the legal and consulting expenses related to making such applications) and such costs are included as a component of general and administrative expenses in the accompanying consolidated statements of operations.

Income Taxes

Income taxes are accounted for under the asset and liability method. Deferred income taxes are recorded for temporary differences between consolidated financial statement carrying amounts and the tax basis of assets and liabilities. Deferred tax assets and liabilities reflect the tax rates expected to be in effect for the years in which the differences are expected to reverse. No income tax expense or benefit was recorded for the three and six months ended June 30, 2023 and 2022, due to the full valuation allowance on the Company’s net deferred tax assets. A valuation allowance is provided if it is more likely than not that some or all the deferred tax assets will not be realized.

The Company also follows the provisions of accounting for uncertainty in income taxes which prescribes a model for the recognition and measurement of a tax position taken or expected to be taken in a tax return, and provides guidance on derecognition, classification, interest and penalties, disclosure and transition.

The Company’s policy is to recognize interest or penalties related to income tax matters in income tax expense. Interest and penalties related to income tax matters were not material for the periods presented.

Net Loss Per Share

Basic net loss per share attributable to common stockholders is computed by dividing net loss attributable to common stockholders by the weighted-average common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares and potentially dilutive securities outstanding for the period. For the three and six months ended June 30, 2023 and 2022, diluted net loss per share attributable to common stockholders is equal to basic net loss per share attributable to common stockholders as common stock equivalent shares from stock options and warrants were anti-dilutive.

The following table sets forth outstanding potentially dilutive shares that have been excluded from the calculation of diluted net loss per share attributable to common stockholders because of their anti-dilutive effect (in common stock equivalents):


	June 30, 2023		June 30, 2022
Common stock options issued and outstanding		612,796		133,257
Warrants to purchase common stock		4,876,639		1,203,819
Total anti-dilutive shares		5,489,435		1,337,076

Stock-Based Compensation

Service-Based Awards

The Company recognizes stock-based compensation expense for service-based stock options and restricted stock units (“RSUs”) over the requisite service period on a straight-line basis. Employee and director stock-based compensation for service-based stock options is measured based on estimated fair value as of the grant date using the Black-Scholes option pricing model. The Company estimates the fair value of RSUs based on the closing price of the Company’s common stock on the date of issuance. The Company uses the following assumptions for estimating fair value of service-based option grants:

Fair Value of Common Stock – The fair value of common stock underlying the option grant is determined based on observable market prices of the Company’s common stock.

Expected Volatility – Volatility is a measure of the amount by which the Company’s share price has historically fluctuated or is expected to fluctuate (i.e., expected volatility) during a period. Due to the lack of an adequate history of a public market for the trading of the Company’s common stock and a lack of adequate company-specific historical and implied volatility data, volatility has been estimated and based on the historical volatility of a group of similar companies that are publicly traded. For these analyses, the Company has selected companies with comparable characteristics, including enterprise value, risk profiles, and position within the industry, and with historical share price information sufficient to meet the expected term of the stock-based awards.

Expected Term – This is the period of time during which the options are expected to remain unexercised. Options have a maximum contractual term of ten years. The Company estimates the expected term of stock options using the “simplified method”, whereby the expected term equals the average of the vesting term and the original contractual term of the underlying option.

Risk-Free Interest Rate – This is the observed yield on zero-coupon U.S. Treasury securities, as of the day each option is granted, with a term that most closely resembles the expected term of the option.

Expected Forfeiture Rate – Forfeitures are recognized as they occur.

Performance-Based Options

Stock-based compensation expense for performance-based options is recognized based on amortizing the fair market value as of the grant date over the periods during which the achievement of the performance is probable. Performance-based options require certain performance conditions to be achieved in order for these options to vest. These options vest on the date of achievement of the performance condition.

Market-Based Options

Stock-based compensation expense for market-based options is recognized on a straight-line basis over the derived service period, regardless of whether the market condition is satisfied. Market-based options subject to market-based performance targets require achievement of the performance target in order for these options to vest. The Company estimates the fair value of market-based options as of the grant date and expected term using a Monte Carlo simulation that incorporates option-pricing inputs covering the period from the grant date through the end of the derived service period.

Recently Issued Accounting Pronouncements Not Yet Adopted

In March 2023, the FASB issued ASU No. 2023-01, Leases (Topic 842): Common Control Arrangements ("ASU 2023-01"), amending certain provisions of ASC 842 that apply to arrangements between related parties under common control. This standard amends the accounting for leasehold improvements in common-control arrangements for all entities. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years, with early adoption permitted. The Company does not expect to early adopt this guidance and is in the process of evaluating the impact of adoption of this guidance on the Company’s consolidated financial statements.

Recently Adopted Accounting Pronouncements

None.

4. Balance Sheet Details

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


	June 30, 2023		December 31, 2022
Insurance	$	557	$	626
Prepaid rent		84		81
Pre-clinical and clinical related expenses		13		64
Other		61		77
Total	$	715	$	848

Other assets consisted of the following (in thousands):


	June 30, 2023		December 31, 2022
Insurance	$	407	$	513
Other		9		10
Total	$	416	$	523

Accrued liabilities consisted of the following (in thousands):


	June 30, 2023		December 31, 2022
Current portion of finance lease liabilities	$	10	$	9
Accrued compensation		136		160
Preclinical and clinical related expenses		19		150
Legal fees		20		44
Accrued franchise tax		20		162
Other		86		70
Total	$	291	$	595

5. Revenues

The following is a summary description of the material revenue arrangements, including arrangements that generated revenues during the three and six months ended June 30, 2023 and 2022.

Allergan License Agreements

2017 Allergan Amendment

In 2017, the Company entered into a series of agreements (collectively, the “2017 Allergan Agreement”), which ultimately transferred Suneva Medical, Inc.’s license and supply rights of the Company’s cell conditioned medium (“CCM”) skin care ingredient in the medical aesthetics market to Allergan Sales LLC (“Allergan”) and granted Allergan an exclusive, royalty-free, perpetual, irrevocable, non-terminable and transferable license, including the right to sublicense to third parties, to use the Company’s CCM skin care ingredient in the medical aesthetics market. The 2017 Allergan Agreement also obligated the Company to deliver CCM to Allergan (the “Supply of CCM to Allergan”) in the future as well as share with Allergan any potential future improvements to the Company’s CCM skin care ingredients identified through the Company’s research and development efforts (“Potential Future Improvements”). In consideration for the execution of the agreements, the Company received a cash payment of $11.0 million and a potential additional payment of $5.5 million if Allergan’s net sales of products containing the Company’s CCM skin care ingredient exceeds $60.0 million in any calendar year through December 31, 2027.

2019 Allergan Amendment

In March 2019, the Company entered into a separate agreement with Allergan (the “2019 Allergan Amendment”) to amend the 2017 Allergan Agreement in exchange for a one-time payment of $7.5 million to the Company. The agreement broadened Allergan’s license rights, expanding Allergan’s access to certain sales channels where its products incorporating the CCM ingredient can be sold. Specifically, the license was broadened to provide Allergan the exclusive right to sell through the “Amazon Professional” website, or any website or digital platform owned or licensed by Allergan or under the Allergan brand name, and non-exclusive rights to sell on other websites and through brick-and-mortar medical spas and wellness centers (excluding websites and brick-and-mortar stores of luxury brands).

The Company evaluated the 2019 Allergan Amendment under ASC 606 and concluded that Allergan continues to be a customer and that the expanded license is distinct from the 2017 Allergan Agreement. The Company determined the expanded license under the 2019 Allergan Amendment to be functional intellectual property as Allergan has the right to utilize the Company’s CCM skin care ingredient, and that ingredient is functional to Allergan at the time the Company transferred the expanded license.

The standalone selling price of the expanded license was not readily observable since the Company has not yet established a price for this expanded license and the expanded license has not been sold on a standalone basis to any customer. The Company accounted for the 2019 Allergan Amendment as a modification to the 2017 Allergan Agreement. The contract modification was accounted for as if the 2017 Allergan Agreement had been terminated and the new contract included the expanded license as well as the remaining performance obligations that arose from the 2017 Allergan Agreement related to the Supply of CCM to Allergan and Potential Future Improvements.

The total transaction price for the new contract included the $7.5 million from the 2019 Allergan Amendment as well as the amounts deferred as of the 2019 Allergan Amendment execution date for each the Supply of CCM to Allergan and Potential Future Improvements.

The standalone selling price for the Supply of CCM to Allergan was determined based on comparable sales transactions. The standalone selling price of the Potential Future Improvements was estimated at the fully burdened rate of research and development employees cost plus a commercially reasonable markup. The amount of the total transaction price allocated to the expanded license was determined using the residual approach, as a result of not having a standalone selling price for the expanded license; that is, the total transaction price less the standalone selling prices of the Supply of CCM to Allergan and Potential Future Improvements.

Revenue related to the Supply of CCM to Allergan has been deferred and recognized at the point in time in which deliveries are completed while revenue related to the Potential Future Improvements has been deferred and amortized ratably over the remaining life of the patent into early 2028. The Supply of CCM to Allergan under the 2019 Allergan Amendment was entirely fulfilled during the year ended December 31, 2019. The $7.5 million residual amount of the total transaction price allocated to the expanded license was recognized as license revenue upon transfer of the license to Allergan in March 2019.

2020 Allergan Amendment

In January 2020, the Company further amended the 2019 Allergan Amendment in exchange for a one-time payment of $1.0 million to the Company (the “2020 Allergan Amendment”). The 2020 Allergan Amendment further broadened Allergan’s exclusive and non-exclusive license rights to include products used for or in connection with microdermabrasion. In addition, the Company agreed to provide Allergan with an additional 200 kilograms of CCM (the “Additional Supply of CCM to Allergan”).

The Company evaluated the 2020 Allergan Amendment under ASC 606 and concluded that Allergan continues to be a customer and that the expanded license is distinct from the 2019 Allergan Amendment. The Company determined the expanded license under the 2020 Allergan Amendment to be functional intellectual property as Allergan has the right to utilize the Company’s CCM skin care ingredient, and that ingredient is functional to Allergan at the time the Company transferred the expanded license.

The standalone selling price of the expanded license was not readily observable since the Company has not yet established a price for this expanded license and the expanded license has not been sold on a standalone basis to any customer. The Company accounted for the 2020 Allergan Amendment as a modification to the 2019 Allergan Amendment (which had modified the 2017 Allergan Agreement, as noted above). The contract modification was accounted for as if the 2019 Allergan Amendment had been terminated and the new contract included the expanded license and Additional Supply of CCM to Allergan, as well as the remaining performance obligation related to Potential Future Improvements.

The total transaction price for the new contract included the $1.0 million from the 2020 Allergan Amendment, the future payment for the Additional Supply of CCM to Allergan, as well as the amounts deferred as of the 2020 Allergan Amendment execution date for Potential Future Improvements.

The standalone selling price for the Additional Supply of CCM to Allergan was determined using the observable inputs of historical comparable sales transactions, including the margin from such sales. The Company also considered its reduced expected cost of satisfying this performance obligation based on the current efficiencies within its CCM manufacturing processes. Due to significant efficiencies in the Company’s CCM manufacturing processes, the forecasted cost of CCM production has decreased, while the applied margin was determined by comparison to similar sales transactions in prior years. The standalone selling price of the Potential Future Improvements was estimated at the fully burdened rate of research and development employees cost plus a commercially reasonable markup. The amount of the total transaction price allocated to the expanded license was determined using the residual approach, as a result of not having a standalone selling price for the expanded license; that is, the total transaction price less the standalone selling prices of the Additional Supply of CCM to Allergan and Potential Future Improvements.

Under the Amended and Restated License Agreement, as amended, Allergan will indemnify the Company for third party claims arising from Allergan’s breach of the agreement, negligence or willful misconduct, or the exploitation of products by Allergan or its sublicensees. The Company will indemnify Allergan for third party claims arising from the Company’s breach of the agreement, negligence or willful misconduct, or the exploitation of products by the Company prior to the effective date. Allergan may terminate the Agreement for convenience upon one business days’ notice to the Company.

Revenue related to the Additional Supply of CCM to Allergan was deferred and was recognized at the point in time in which deliveries were completed. All deliveries of Additional Supply of CCM to Allergan have been completed as of March 31, 2021. As such, there is no revenue for the three and six months ended June 30, 2023 and 2022.

Revenue of $0.2 million related to the Potential Future Improvements has been deferred and amortized ratably over the remaining life of the patent into early 2028, for which $5 thousand and $10 thousand of previously deferred revenue was recognized in revenue during each of the three and six months ended June 30, 2023 and 2022, respectively.

2022 Allergan Letter Agreement

Pursuant to the 2017 Allergan Amendment, the Company had the right to a potential milestone payment of $5.5 million if Allergan’s net sales of products containing the Company’s CCM skin care ingredient exceeds $60.0 million in any calendar year through December 31, 2027. In lieu of the potential milestone payment of $5.5 million, the Company entered into a letter agreement on March 18, 2022 (the “Letter Agreement”) with Allergan. In consideration for the execution of the Letter Agreement, the Company received a one-time payment equal to $3.8 million (the “Final Payment”) in March 2022. In exchange, among other things, the Company agreed that the Final Payment represents a full and final satisfaction of all money due to the Company pursuant to the License Agreement. The Company evaluated the 2022 Allergan Letter Agreement under ASC 606 and concluded that the performance obligation has been satisfied and therefore applied point in time recognition. The Company recognized the entire $3.8 million of license revenue related to the Letter Agreement during the year ended December 31, 2022. The Letter Agreement did not have an impact on the remaining performance obligation to share with Allergan any Potential Future Improvements to CCM identified through the Company’s research and development efforts.

Remaining Performance Obligation and Deferred Revenue

The remaining performance obligation is the Company’s obligation to share with Allergan any Potential Future Improvements to CCM identified through the Company’s research and development efforts. Deferred revenue recorded for the Potential Future Improvements was $0.1 million as of both June 30, 2023 and December 31, 2022. Deferred revenue is classified in current portion of deferred revenue liabilities when the Company’s obligations to provide research for Potential Future Improvements are expected to be satisfied within twelve months of the balance sheet date. The deferred revenue is recognized on a straight-line basis over the remaining life of the licensing patents into early 2028.

Amerimmune Collaborative Development and Commercialization Agreement

In October 2020, the Company entered into a Collaborative Development and Commercialization Agreement (the “Collaboration Agreement”) with Amerimmune to jointly develop emricasan for the potential treatment of COVID-19. The FDA approved an investigational new drug application (IND) to initiate a Phase 1 study of emricasan in mild COVID-19 patients to assess safety and tolerability in 2020. Under the Collaboration Agreement, Amerimmune, at its expense and in collaboration with the Company, was required to use commercially reasonable efforts to lead the development activities for emricasan. Amerimmune was responsible for conducting clinical trials and the Company agreed to provide reasonable quantities of emricasan for such purpose.

Pursuant to the terms of the Collaboration Agreement, each party retained ownership of their legacy intellectual property and responsibility for ongoing patent application prosecution and maintenance costs and jointly owned any intellectual property developed during the term of the agreement. In addition, the Company granted Amerimmune an exclusive option, subject to terms and conditions including completion of a Phase 2 clinical trial by Amerimmune during the research term, to obtain an exclusive license that, if granted by us, would have allowed Amerimmune alone, or in conjunction with one or more strategic partners, to use its commercially reasonable efforts to develop, manufacture, and commercialize emricasan and other caspase modulators, including CTS-2090 and CTS-2096, and the Company would have shared the profits equally with Amerimmune. No consideration would have been transferred to the Company until profits, as defined in the Collaboration Agreement, were generated by Amerimmune from developing or commercializing products.

The Company identified multiple promises to deliver goods and services, which included at the inception of the agreement: (i) a license to technology and patents, information, and know-how; (ii) supply of emricasan, and (iii) collaboration, including the Company’s participation in a Joint Development Committee and Joint Partnering Committee. At inception and through November 28, 2022, the Company has identified one performance obligation for all the deliverables under the Collaboration Agreement since the delivered

elements were either not capable of being distinct or were not distinct within the context of the contract. No upfront consideration was exchanged between the parties and any consideration received would have been dependent on the successful execution of a qualifying strategic partnership, as defined, on the successful commercialization of emricasan, or upon a change in control of Amerimmune, as defined. Although the Company would have recognized revenue upon the occurrence of one of these events, no such events had occurred as of November 28, 2022.

On January 19, 2022, the Company provided a notice of material breach in connection with Amerimmune’s non-performance under the Collaboration Agreement and, on March 3, 2022, filed a demand for arbitration (“Arbitration Demand”). On March 11, 2022, Judicial Arbitration and Mediation Services, Inc. (“JAMS”) issued a Notice of Commencement of Arbitration letter, confirming the commencement of the arbitration as of that date.

On March 8, 2022, Amerimmune provided written notice to exercise an option for additional license rights to develop additional products however, the Company rejected Amerimmune’s election of the option and believes that Amerimmune no longer has the right to exercise the option based on, among other reasons, the Company’s belief that the Collaboration Agreement is properly terminated as set forth in the Company’s Arbitration Demand.

On November 28, 2022, the Company received an Interim Award (“Interim Award”) issued by the Arbitrator presiding over the Arbitration Demand filed by the Company in the County of San Diego, against Amerimmune LLC seeking a declaratory judgment that Amerimmune has materially breached the terms of the Collaboration Agreement to jointly develop emricasan for the potential treatment of COVID-19 entered into by and between the Company and Amerimmune on October 26, 2020, and that the Company therefore was entitled to terminate the Collaboration Agreement.

As affirmed by the Interim Award, the Company has terminated the Collaboration Agreement and all rights and licenses granted to Amerimmune by the Company have been terminated, and Amerimmune shall cease any and all development, manufacture and commercialization activities under the Collaboration Agreement, and any and all rights granted by the Company to Amerimmune revert to the Company except any such rights that shall survive termination of the Collaboration Agreement.

On January 2, 2023, the arbitrator issued the Final Award affirming the arbitration outcome set forth in the Interim Award. Amerimmune did not petition a court to vacate or correct the Final Award by the applicable deadline. The Company sought to confirm the award to judgment by filing a petition to confirm award filed. A hearing on the petition was held on May 26, 2023 at which the Superior Court of California granted the Company’s petition to confirm the arbitration award.

6. Redeemable Convertible Preferred Stock

The redeemable convertible preferred stock instruments were contingently redeemable preferred stock. Each series contained redemption features, limited voting rights, dividends, and conversion terms. The convertible preferred stock was presented on the consolidated balance sheets as mezzanine equity as of March 31, 2022. All shares of redeemable convertible preferred stock were fully redeemed and were no longer outstanding as of June 30, 2022.

March 2022 Offering

In March 2022, the Company completed a private placement offering (the “March 2022 Offering”) of (i) 2,500 shares of the Company’s Series A Redeemable Convertible Preferred Stock, par value $0.0001 per share (the “Series A Preferred Stock”), and (ii) 2,500 shares of the Company’s Series B Redeemable Convertible Preferred Stock, par value $0.0001 per share (the “Series B Preferred Stock” and together with the Series A Preferred Stock, the “Preferred Stock”), in each case, at an offering price of $952.38 per share, representing a 5% original issue discount to the stated value of $1,000 per share of Preferred Stock, for gross proceeds from the Offerings of approximately $4.76 million, before the deduction of the placement agent’s fee and other offering expenses. The shares of Series A Preferred Stock had a stated value of $1,000 per share and were convertible, at a conversion price of $20.00 per share, into 125,000 shares of common stock. The shares of Series B Preferred Stock had a stated value of $1,000 per share and were convertible, at a conversion price of $20.00 per share, into 125,000 shares of common stock. The closing occurred on March 25, 2022. The proceeds of $4.76 million were held in escrow and were only permitted to be disbursed to the Company upon conversion of the Series A and Series B Preferred Stock. Since the redeemable convertible preferred stock could have been redeemed at the option of the holder, but was not mandatorily redeemable, the redeemable preferred stock was classified as mezzanine equity and initially recognized at fair value of $4.76 million as mezzanine equity on the accompanying statement of redeemable convertible preferred stock and stockholders' equity.

The March 2022 Offering generated gross proceeds of $4.76 million and the Company incurred cash-based placement agent fees and other offering expenses of approximately $0.6 million. The proceeds were held in escrow and were only permitted to be disbursed to the Company upon conversion of the Series A and Series B Preferred Stock.

The Company’s placement agent was issued compensatory warrants to purchase up to 7.0% of the aggregate number of shares of Preferred Stock sold in the offering (on an as-converted to common stock basis), resulting in common stock warrants to purchase up to 17,501 shares of common stock, with an exercise price of 125% of the offering price, or $25.00 per share, which are exercisable 6 months after issuance on or after September 25, 2022, and expire five and a half (5.5) years following the date of issuance on September 25, 2027.

The placement agent warrants, which are recorded as a component of stockholders’ equity, were valued at an aggregate of $34 thousand dollars using the Black Scholes option pricing model based upon the following assumptions: expected volatility of 78.90%, risk-free interest rate of 2.40%, expected dividend yield of 0%, and an expected term of 5.5 years.

As of June 30, 2023, the Company had 17,501 shares of common stock reserved for issuance pursuant to the placement agent’s warrants issued by the Company in the March 2022 Offering at an exercise price of $25.00 per share.

Voting Rights

The shares of Preferred Stock had no voting rights, except that they only have the right to vote, with the holders of common stock, as a single class on a proposal to approve an amendment to our certificate of incorporation to effect a reverse stock split of our issued and outstanding common stock within a range, to be determined by our board of directors and set forth in such proposal.

Each share of Series A Preferred Stock outstanding on April 14, 2022 (the “Record Date”) had a number of votes equal to the number of shares of Common Stock issuable upon conversion of such share (whether or not such shares are then convertible). Accordingly, as of the Record Date, each share of Series A Preferred Stock had 3,776 votes, which is determined by dividing $1,000, the stated value of one share of Series A Preferred Stock, by $0.2648, the NASDAQ Minimum Price as of the closing on March 25, 2022. The holders of the Series A Preferred Stock agreed to not transfer their shares of Series A Preferred Stock until after the 2022 Annual Meeting and to vote all shares of Series A Preferred Stock in favor of the Reverse Stock Split Proposal.

Each share of Series B Preferred Stock outstanding on the Record Date entitled the holder thereof to cast 30,000 votes on the Reverse Stock Split Proposal. The holders of the Series B Preferred Stock agreed to not transfer their shares of Series B Preferred Stock until after the 2022 Annual Meeting and to vote all shares of Series B Preferred Stock in the same proportion as the aggregate shares of Common Stock and Series A Preferred Stock are voted on the Reverse Stock Split Proposal. As an example, if 70% of the aggregate votes cast by Common Stock and Series A Preferred Stock voting on the Reverse Stock Split Proposal were voted in favor thereof and 30% of the aggregate votes cast by Common Stock and Series A Preferred Stock voting on the Reverse Stock Split Proposal were voted against such Proposal, then 70% of the votes entitled to be cast by Series B Preferred Stock would have been cast in favor of the proposal and 30% of such votes would have been cast against the proposal.

Dividends

The holders of the redeemable convertible preferred stock were entitled to receive dividends on shares of Preferred Stock equal (on an as-if-converted-to-Common-Stock basis, disregarding for such purpose any conversion limitations hereunder) to and in the same form as dividends actually paid on shares of the Common Stock when, as and if such dividends are paid on shares of the Common Stock. No other dividends were payable on shares of Preferred Stock.

Conversion Rights

Each share of Preferred Stock was convertible, at any time and from time to time from and after the Reverse Stock Split Date at the option of the Holder thereof, into that number of shares of Common Stock determined by dividing the stated value per share of preferred stock by the conversion price. The shares of Series A Preferred Stock had a stated value of $1,000 per share and were convertible, at a conversion price of $20.00 per share, into 125,000 shares of common stock. The shares of Series B Preferred Stock had a stated value of $1,000 per share and were convertible, at a conversion price of $20.00 per share, into 125,000 shares of common stock.

Redemption Rights

Each share of Preferred Stock was redeemable after (i) the earlier of (1) the receipt of authorized stockholder approval for the reverse stock split and (2) the date that was 90 days following the Original Issue Date of March 25, 2022, and (ii) before the date that was 120 days after the Original Issue Date or July 23, 2022 (the “Redemption Period”), each stockholder had the right to cause the Company to redeem all or part of such stockholder’s shares of Preferred Stock at a price per share equal to 105% of the stated value of $1,000 per share.

Between June 2, 2022, and June 29, 2022, at the request of the holders, the Company redeemed for cash proceeds totaling $5.25 million ($4.76 million payment from escrow and $0.5 million redemption payment by the Company), 2,500 outstanding shares of Series A Preferred Stock and 2,500 outstanding shares of Series B Preferred Stock based on the receipt of the Redemption Notices (the “Preferred Redemption”) at a price equal to 105% of the $1,000 stated value per share, which represented all outstanding shares of Preferred Stock. The approximately $1.1 million accretion of the Series A and Series B Preferred Stock to its redemption value was recorded as a reduction to additional paid-in capital. The Company recognized a portion of the accretion as a deemed dividend related to the accretion of the discount and redemption feature of approximately $0.5 million upon redemption of Preferred Stock on the consolidated statement of operations.

On June 30, 2022, the Company filed a Certificate of Elimination with respect to the Series A Preferred Stock and Series B Preferred Stock (the “Series A Certificate of Elimination and the Series B Certificate of Elimination”), which upon filing with the Secretary of State of the State of Delaware (“Delaware Secretary”), eliminated from all matters set forth in the Certificates of Designation of Series A and Series B Preferred Stock.

As of June 30, 2023 and December 31, 2022, all shares of the Series A Preferred Stock and Series B Preferred Stock are no longer outstanding and the Company’s only remaining class of outstanding stock is its common stock, par value $0.0001 per share.

7. Stockholders’ Equity

Common Stock

January 2021 Offering

In January 2021, the Company completed an S-1 offering (the “January 2021 Offering”) of an aggregate of 580,000 shares of common stock, pre-funded warrants to purchase up to 120,000 shares of its common stock, and common stock warrants to purchase up to an aggregate of 700,000 shares of common stock. To the extent that an investor determines, at their sole discretion, that they would beneficially own in excess of the Beneficial Ownership Limitations (or as such investor may otherwise choose), in lieu of purchasing shares of common stock and common stock warrants, such investor could have elected to purchase Pre-Funded Warrants and Common Warrants at the pre-funded purchase price in lieu of the shares of common stock and common stock warrants in such a manner to result in the same aggregate purchase price being paid by such investor to the Company. The combined purchase price of one share of common stock and the accompanying common stock warrant was $20.00, and the combined purchase price of one pre-funded warrant and accompanying common stock warrant was $19.998. The common stock warrants are exercisable for five (5) years at an exercise price of $20.00 per share. The pre-funded warrants were immediately exercisable at an exercise price of $0.002 per share and were exercisable at any time until all of the pre-funded warrants are exercised in full. Placement agent warrants were issued to purchase up to 35,000 shares of common stock, are immediately exercisable for an exercise price of $25.00 per share, and are exercisable for five (5) years following the date of issuance. The Company received gross proceeds of $14.0 million and incurred placement agent’s fees and other offering expenses of approximately $1.9 million.

The common stock warrants and placement agent warrants were valued at $7.2 million and $0.3 million, respectively, using the Black-Scholes option pricing model based on the following assumptions: expected volatility 80.08%, risk-free interest rate 0.38%, expected dividend yield 0%, and an expected term of 5.0 years.

As of June 30, 2023, a total of 336,060 warrants issued in the January 2021 Offering to purchase shares of common stock have been exercised and the Company issued 336,060 shares of its common stock. The Company received gross proceeds of approximately $6.8 million.

As of June 30, 2023, the Company had 387,565 shares and 11,375 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by the Company in the January 2021 Offering, at an exercise price of $20.00 per share and $25.00 per share, respectively.

June 2021 Offering

In June 2021, the Company completed a registered direct offering (the “June 2021 Offering”) of an aggregate of 298,865 shares of common stock, together with accompanying warrants to purchase up to an aggregate of 239,093 shares of common stock, at a public offering price of $22.00 per share. The accompanying warrants permit the investor to purchase additional shares equal to 80% of the number of shares of the Company’s common stock purchased by the investor. The warrants have an exercise price of $20.00 per share, are immediately exercisable, and expire five and a half (5.5) years following the date of issuance. In addition, the Company’s placement agent was issued compensatory warrants equal to 5.0%, or 14,946 shares, of the aggregate number of common stock sold in the offering, which are immediately exercisable for an exercise price of $27.50 and expire five (5) years following the date of issuance on June 7,

2026. The Company received gross proceeds of $6.6 million and incurred cash-based placement agent fees and other offering expenses of approximately $0.9 million.

The warrants and placement agent warrants were valued at $3.0 million and $0.2 million, respectively, using a Black-Scholes option pricing model with the following assumptions: expected volatility 81.44% and 80.15%, risk-free interest rate 0.88% and 0.77%, expected dividend yield 0% and 0%, and an expected term of 5.5 years or 5.0 years, respectively.

As of June 30, 2023, no warrants associated with the June 2021 Offering have been exercised.

As of June 30, 2023, the Company had 90,910 shares and 14,946 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by the Company in the June 2021 Offering, at an exercise price of $20.00 per share and $27.50 per share, respectively. In connection with the July 2022 Offering, the Company agreed to amend warrants, by reducing the exercise price and extending the expiration date, to purchase up to an aggregate of 148,183 shares of common stock of the Company that were originally issued to the investor in the June 2021 Offering. Refer to July 2022 Offering overview below for accounting treatment for the amended warrants.

December 2021 Offering

In December 2021, the Company completed a registered direct offering (the “December 2021 Offering”) of an aggregate of 411,764 shares of common stock and 411,766 warrants to purchase up to 411,766 shares of common stock, at a public offering price of $8.50 per share. The accompanying warrants permit the investor to purchase additional shares equal to approximately the same number of shares of the Company’s common stock purchased by the investor. The warrants have an exercise price of $8.50 per share, may be exercised any time on or after 6 months and one (1) day after the issuance date, and expire five and a half (5.5) years following the date of issuance. In addition, the Company’s placement agent was issued compensatory warrants equal to 5.0%, or 20,590 shares, of the aggregate number of shares of common stock sold in the offering, which are immediately exercisable for an exercise price of $10.626 and expire five and a half (5.5) years following the date of issuance on June 21, 2027. The Company received gross proceeds of $3.5 million and incurred cash-based placement agent fees and other offering expenses of approximately $0.5 million.

The placement agent warrants, which are recorded as a component of stockholders’ equity, were valued at an aggregate $0.1 million using the Black-Scholes option pricing model based on the following assumptions: expected volatility of 79.81%, risk-free interest rate of 1.21%, expected dividend yield of 0% and an expected term of 5.5 years.

As of June 30, 2023, no warrants associated with the December 2021 Offering have been exercised.

As of June 30, 2023, the Company had 164,707 shares and 20,590 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by the Company in the December 2021 Offering, at an exercise price of $8.50 per share and $10.626 per share, respectively. In connection with the July 2022 Offering, the Company agreed to amend warrants, by reducing the exercise price and extending the expiration date, to purchase up to an aggregate of 247,059 shares of common stock of the Company that were originally issued to the investor in the December 2021 Offering. Refer to July 2022 Offering overview below for accounting treatment for the amended warrants.

July 2022 Offering

On July 12, 2022, the Company entered into a Securities Purchase Agreement (the “July 2022 Purchase Agreement”) with a single healthcare-focused institutional investor for the sale by the Company of (i) a pre-funded warrant to purchase up to 1,774,309 shares of Common Stock (the “Pre-Funded Warrant”), (ii) a Series A warrant to purchase up to an aggregate of 1,774,309 shares of common stock (the “Series A Warrant”), and (iii) a Series B warrant to purchase up to an aggregate of 1,774,309 shares of common stock (the “Series B Warrant,” and together with the Pre-Funded Warrant and the Series A Warrant, the “Warrants”), in a private placement offering (the “Offering”). The combined purchase price of one Pre-Funded Warrant and accompanying Series A Warrant and accompanying Series B Warrant was $2.818.

Subject to certain ownership limitations, the Series A Warrant became exercisable immediately after the issuance date at an exercise price equal to $2.568 per share of common stock, subject to adjustments as provided under the terms of the Series A Warrant, and has a term of five and a half (5.5) years from the issuance date. Subject to certain ownership limitations, the Series B Warrant became exercisable immediately after the issuance date at an exercise price equal to $2.568 per share of common stock, subject to adjustments as provided under the terms of the Series B Warrant, and has a term of one and a half (1.5) years from the issuance date. Subject to certain ownership limitations described in the Pre-Funded Warrant, the Pre-Funded Warrant was immediately exercisable at an exercise price of $0.0001 per share of common stock any time until all of the Pre-Funded Warrant is exercised in full. As of June 30, 2023, the

Pre-Funded Warrant to purchase up to an aggregate of 1,774,309 shares of common stock had been fully exercised and the Company issued 1,774,309 shares of common stock.

The Company also agreed to amend certain warrants to purchase up to an aggregate of 447,800 shares of common stock of the Company that were issued to the investor in the private placement in November 2020, June 2021 and December 2021 with exercise prices ranging from $8.50 to $34.00 per share and expiration dates ranging from May 18, 2026 to June 21, 2027, so that such warrants have a reduced exercise price of $2.568 per share and expiration date of five and a half (5.5) years following the closing of the private placement, for an additional offering price of $0.0316 per amended warrant. The incremental fair value resulting from the modifications to the warrants was adjusted against the gross proceeds from the offering as an equity issuance cost.

The gross proceeds to the Company were approximately $5 million, before deducting the placement agent’s fees and other offering expenses, and excluding the proceeds, if any, from the exercise of the Series A Warrant, the Series B Warrant, and amended warrants.

The Series A warrants and placement agent warrants were valued at $3.8 million and $0.2 million, respectively, using the Black-Scholes option pricing model based on the following assumptions: expected volatility 79.28%, risk-free interest rate 3.06%, expected dividend yield 0%, and an expected term of 5.5 years.

The Series B warrants were valued at $2.3 million using the Black-Scholes option pricing model based on the following assumptions: expected volatility 74.25%, risk-free interest rate 3.16%, expected dividend yield 0%, and an expected term of 1.5 years.

The amended warrants were valued at $1.0 million using the Black-Scholes option pricing model based on the following assumptions: expected volatility 79.28%, risk-free interest rate 3.06%, expected dividend yield 0%, and an expected term of 5.5 years. The estimated fair value of the original warrants immediately prior to the warrant amendments was $0.5 million using Black-Scholes option pricing model based on the following assumptions: expected volatility ranging from 81.21 – 83.34%, risk-free interest rates of 3.06 – 3.16%, expected dividend yield 0%, and an expected terms of 3.84 – 4.94 years. The warrant modifications resulted in an estimated value of $0.5 million, measured as the incremental fair value of the amended warrants, and was adjusted against the gross proceeds from the offering.

As of June 30, 2023, no warrants associated with the July 2022 Purchase Agreement have been exercised.

As of June 30, 2023, the Company had 3,996,418 shares and 124,202 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by the Company in the July 2022 Purchase Agreement, at an exercise price of $2.568 per share and $3.5225 per share, respectively.

Common Stock Purchase Agreement with Lincoln Park

In July 2020, the Company entered into a common stock purchase agreement (the “2020 Purchase Agreement”) with Lincoln Park which provided that, upon the terms and subject to the conditions and limitations in the 2020 Purchase Agreement, Lincoln Park was committed to purchase up to an aggregate of $10.0 million of shares of the Company’s common stock at the Company’s request from time to time during a 24 month period that began in July 2020 and at prices based on the market price of the Company’s common stock at the time of each sale. Upon execution of the 2020 Purchase Agreement, the Company sold 16,425 shares of common stock at $60.88 per share to Lincoln Park for gross proceeds of $1.0 million. During the year ended December 31, 2020, the Company sold an additional 15,000 shares of common stock to Lincoln Park for gross proceeds of approximately $0.5 million. In addition, in consideration for entering into the 2020 Purchase Agreement and concurrently with the execution of the 2020 Purchase Agreement, the Company issued 3,348 shares of its common stock to Lincoln Park. The 2020 Purchase Agreement expired automatically pursuant to its term on August 1, 2022, and, as of such expiration, the Company could not, and has not, sold any additional shares of common stock to Lincoln Park pursuant to the 2020 Purchase Agreement.

Common Stock Warrants

As of June 30, 2023, warrants to purchase 68 shares of common stock with an exercise price of $1,486.00 per share remain outstanding that were issued by Conatus in connection with obtaining financing in 2016. These warrants expire on July 3, 2023.

See warrant discussion above in connection with the January 2021 Offering, the June 2021 Offering, the December 2021 Offering, and the July 2022 Offering.

Stock-Based Compensation

Equity Incentive Plans

On December 18, 2017, Private Histogen established the Histogen Inc. 2017 Stock Plan (the “2017 Plan”). Under the 2017 Plan, Private Histogen was authorized to issue a maximum aggregate of 41,861 shares of common stock with adjustments for unissued or forfeited shares under the predecessor plan (the Histogen Inc. 2007 Stock Plan). In April 2019, Private Histogen amended the 2017 Plan, which increased the number of common stock available for grants by 16,336 shares. The 2017 Plan permitted the issuance of incentive stock options (“ISOs”), non-statutory stock options (“NSOs”), and Stock Purchase Rights. NSOs could be granted to employees, directors, or consultants, while ISOs could be granted only to employees. Options granted vest over a maximum period of four years and expire ten years from the date of grant. In connection with the closing of the Merger, no further awards were made under the 2017 Plan and any cancelled, forfeited or expired options were not made available for granting. As of June 30, 2023, 4,662 fully vested options remain outstanding under the 2017 Plan.

In May 2020, in connection with the closing of the Merger, the Company’s stockholders approved the Company’s 2020 Incentive Award Plan (the “2020 Plan”). The maximum number of shares of the Company’s common stock available for issuance under the 2020 Plan equals the sum of (a) 42,500 shares; (b) any shares of common stock of the Company which are subject to awards under the Conatus 2013 Equity Incentive Plan (the “Conatus 2013 Plan”) as of the effective date of the 2020 Plan which become available for issuance under the 2020 Plan after such date in accordance with its terms; and (c) an annual increase on the first day of each calendar year beginning with the January 1 of the calendar year following the effectiveness of the 2020 Plan and ending with the last January 1 during the initial ten-year term of the 2020 Plan, equal to the lesser of (i) five percent of the number of shares of the Company’s common stock outstanding (on an as-converted basis) on the final day of the immediately preceding calendar year, and (ii) such lesser number of shares of the Company’s common stock as determined by the Company’s board of directors.

On June 20, 2023, the Company held its 2023 Annual Meeting of Stockholders (the “Annual Meeting”) at which time the stockholders approved an amendment to the Company’s 2020 Plan to increase the number of shares authorized for issuance thereunder by 500,000 shares, as previously approved by the Company's Board of Directors.

The following summarizes activity related to the Company’s stock options under the 2017 Plan and the 2020 Plan for the six months ended June 30, 2023:


	Options Outstanding			Weighted- average Exercise Price		Weighted- average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022		113,279		$	21.30		8.09	$	—
Granted		472,454			0.94
Cancelled / Forfeited		(84,617	)		18.86
Outstanding at June 30, 2023		501,116		$	2.52		9.58	$	—
Vested and exercisable at June 30, 2023		27,662		$	28.64		6.17	$	—

Valuation of Stock Option Awards

The following weighted-average assumptions were used to calculate the fair value of awards granted to employees, non-employees and directors:


	Three Months Ended June 30,						Six Months Ended June 30,
	2023			2022			2023			2022
Expected volatility		97.14	%		79.50	%		93.53	%		79.00	%
Risk-free interest rate		3.92	%		2.96	%		3.91	%		2.14	%
Expected option life (in years)		5.93			5.84			6.03			6.02
Expected dividend yield		—	%		—	%		—	%		—	%

Additionally, in connection with the closing of the Merger, no further awards will be made under the Conatus 2013 Plan. As of June 30, 2023, 4,887 fully vested options remain outstanding under the Conatus 2013 Plan with a weighted average exercise price of $859.59 per share.

Restricted Stock Units

On November 8, 2021, the Company granted 23,423 restricted stock units to the Company’s then Interim Chief Executive Officer, Chief Financial Officer, and Senior Vice President of Technical Operations. The fair value of the RSUs was $14.58 per share, which was the closing market price of the Company’s common stock on the date of grant. The RSUs vest in full upon the earlier of (1) 12 months following the grant date and (2) a change of control of the Company, as defined in the Company’s 2020 Plan, subject to continued service to the Company. Prior to RSU vesting, on November 7, 2022, the Company and the RSU recipients mutually agreed to enter into RSU Cancellation Agreements such that the RSU awards are cancelled and no longer outstanding.

Forfeiture Stock Option Grants

On March 10, 2023, the Company approved stock option grants to purchase 111,063 shares of the Company’s common stock to certain officers and employees as part of an annual award grant. Because the Company did not have sufficient shares available under the 2020 Plan at the time of approval, these shares were subject to forfeiture in the event that the shares available pursuant to the plan were not increased prior to the one-year anniversary and vesting of the award by an amount required to be available for issuance for all outstanding stock awards containing the forfeiture condition (“Forfeiture Stock Option Grants”). The Company had a conditional obligation to increase the shares available for issuance under the stock option plans before these Forfeiture Stock Option Grants can be granted at which time the Company would begin to recognize compensation costs from the inception date of the award through grant date. On June 20, 2023, the Company held its Annual Meeting at which the stockholders approved an amendment to the Company’s 2020 Plan to increase the number of shares authorized for issuance thereunder by 500,000 shares, which met the Company’s conditional obligation to increase the shares available for issuance. The Forfeiture Stock Options Grants were granted as of June 20, 2023.

As such, during the three and six months ended June 30, 2023, the Company began recognizing compensation expense for the Forfeiture Stock Option Grants dating back to the March 10, 2023 inception date of the grant awards.

Stock Option Cancellations

On March 10, 2023, the Company entered into Stock Option Cancellation Agreements with certain officers and employees (the “Option holders”), pursuant to which such individuals surrendered and cancelled 69,045 stock options with a weighted average price of $17.92 per share to purchase shares of the Company’s common stock (the “Cancelled Stock Options”). Pursuant to the terms of the Stock Option Cancellation Agreements, the Company agreed to pay each of the option holders a lump sum cash payment of $250 in exchange for the agreement to cancel the aforementioned stock options. The Company determined that because the Cancelled Stock Options were cancelled in exchange of cash consideration, the cash payments are considered partial settlements of the original awards and the cancellation should be accounted for as a repurchase of outstanding equity. The Company also determined that cash paid in exchange of cancellation was less than the fair value of the original awards and the stock options were probable of vesting pursuant to their original terms. Therefore, the Company recorded previously unrecognized compensation costs related to the Cancelled Stock Options of approximately $0.4 million during the three and six months ended June 30, 2023.

Inducement Grant

On February 23, 2023, the Company issued 106,793 stock options to its newly appointed Executive Vice President and Chief Scientific Officer as an inducement grant outside of the Company’s equity incentive plans in accordance with Nasdaq Listing Rule 5635(c)(4). In accordance with the award agreement, 25% of the options vest on the first anniversary of the employee’s hire date, on February 1, 2024, and then ratably over the remaining 36 months. Based on the terms being similar to standard grants as awarded under the 2020 Plan, the Company applied ASC 718 accounting basis for the recognition of share-based compensation expense. The inducement grant was valued at $0.1 million using the Black-Scholes option pricing model based on the following assumptions: expected volatility 91.65%, risk-free interest rate 4.06%, expected dividend yield 0%, and an expected term of 6.08 years. As of June 30, 2023, no inducement grant options are vested and total unrecognized compensation cost related to unvested options was approximately $0.1 million which is expected to be recognized over a weighted-average period of 3.58 years.

Stock-based Compensation Expense

The compensation cost, including the inducement grant expense, that has been included in the accompanying condensed consolidated statements of operations for all stock-based compensation arrangements is detailed as follows (in thousands):


	Three Months Ended June 30,					Six Months Ended June 30,
	2023		2022			2023		2022
General and administrative	$	24	$	133		$	410	$	267
Research and development		8		(19	)		41		13
Total	$	32	$	114		$	451	$	280

As of June 30, 2023, total unrecognized compensation cost related to unvested options was approximately $0.4 million which is expected to be recognized over a weighted-average period of 3.45 years.

Common Stock Reserved for Future Issuance

Common stock reserved for future issuance is as follows:


	As of June 30,
	2023		2022
Common stock warrants		4,876,639		1,203,819
Common stock options issued and outstanding under stock plans		506,003		133,257
Common stock options issued and outstanding outside of stock plans (inducement grant)		106,793		—
Common stock available for issuance under stock plans		422,084		90,560
Total		5,911,519		1,427,636

8. Commitments and Contingencies

Leases

In January 2020, the Company entered into a long-term operating lease with San Diego Sycamore, LLC (“Sycamore”) for its headquarters that includes office and laboratory space. The lease commenced on March 1, 2020 and expires on August 31, 2031, with no options to renew or extend. The lease was accounted for as a modification of the Company’s existing lease with Sycamore as the lease agreement did not grant the Company an additional right-of-use asset.

The terms of the lease agreement include seven months of rent abatement at lease commencement and a tenant improvement allowance of up to $2.2 million. The tenant improvements are required to be permanently affixed to the leased office and laboratory space and do not constitute leasehold improvements of the Company. During the construction period of the tenant improvements, the lease agreement requires the Company to relocate its operations to a similar Sycamore property whereby monthly rent is substantially reduced for the duration of the construction period. The lease is subject to additional variable charges for common area maintenance, insurance, taxes and other operating costs. At lease commencement, the Company recognized a right-of-use asset and operating lease liability totaling approximately $4.5 million. The Company used a discount rate based on its estimated incremental borrowing rate to determine the right-of-use asset and operating lease liability amounts to be recognized. The Company determined its incremental borrowing rate based on the term and lease payments of the new operating lease and what it would normally pay to borrow, on a collateralized basis, over a similar term for an amount equal to the lease payments. Operating lease expense is recognized on a straight-line basis over the lease term. The terms of the lease required the Company to provide the landlord a security deposit of $0.3 million as collateral for a letter of credit issued to be held throughout the lease term. This security deposit is shown as restricted cash on the accompanying consolidated balance sheets.

In June 2021, the Company entered into the First Amendment to Lease (the “Amendment”). Pursuant to the Amendment, among other things, the Company and Sycamore agreed (i) to substitute the temporary premises, (ii) to delay the start of construction and the timing of the Company’s relocation to the replacement temporary premises, (iii) to increase the tenant improvement allowance from $2.2 million to $2.3 million, (iv) to increase the letter of credit amount from $0.3 million to $0.4 million upon commencement of the tenant improvements, and (v) to review potential subsequent reductions to the security deposit and related letter of credit requirement at certain time intervals along the lease term provided that the Company is not in default. As a result of the modification, the lease liability was remeasured using the incremental borrowing rate at the modification date and a corresponding reduction of $0.3 million was recorded to both the lease liability and right-of-use-asset.

During the year ended December 31, 2022, the Company completed construction of the building improvements. Due to construction delays, the tenant improvement construction period was extended by two months for which the Company was granted an incremental two-month extension of rent abatement and effectively shortened the lease term. Upon completion of the improvements, the building improvement costs in excess of the tenant improvement allowance that was funded by the Company were capitalized to the right-of-use-asset, to be amortized over the remaining lease term. As a result of the modification, the lease liability was remeasured and a corresponding increase of $0.4 million was recorded to both the lease liability and right-of-use-asset.

The Company leases certain office equipment that is classified as a finance lease. As of June 30, 2023, the weighted-average remaining term of the Company’s operating lease and finance lease was approximately 8.2 years and 1.0 years, respectively.

The Company recognizes right-of-use assets and lease liabilities at the lease commencement date based on the present value of future minimum lease payments over the lease term. The discount rate used to determine the present value of the lease payments is the rate implicit in the lease unless that rate cannot be readily determined, in which case, the Company utilizes its incremental borrowing rate in determining the present value of the future minimum lease payments. At the inception dates of the leases, the weighted-average discount rate for the Company’s operating and finance lease was 12.2% and 10.0%, respectively.

The Company does not record leases with an initial term of 12 months or less on the consolidated balance sheets. Expense for these short-term leases is recognized on a straight-line basis over the lease term. The Company has elected the practical expedient to combine lease and non-lease components into a single component for all classes of underlying assets.

At June 30, 2023, future minimum payments of lease liabilities were as follows (in thousands):


	Operating Lease			Finance Lease
2023 (Remaining 6 months)	$	392		$	6
2024		803			5
2025		827			—
2026		853			—
2027		879			—
Thereafter		3,451			—
Total minimum lease payments		7,205			11
Less: imputed interest		(2,701	)		(1	)
Total future minimum lease payments		4,504			10
Less: current obligations under leases		(265	)		(10	)
Noncurrent lease obligations	$	4,239		$	—

Material Contracts

Pfizer Inc.

In July 2010, Conatus entered into a Stock Purchase Agreement with Pfizer, pursuant to which it acquired all of the outstanding capital stock of Idun Pharmaceuticals, Inc., which was subsequently spun off to Conatus stockholders in January 2013. Under the stock purchase agreement, the Company may be required to make payments to Pfizer totaling $18.0 million upon the achievement of specified regulatory milestones.

Prior to the termination of the Collaboration Agreement with Amerimmune on November 28, 2022, the obligations pursuant to the Stock Purchase Agreement were the responsibility of our former collaboration partner, Amerimmune. In accordance with authoritative guidance, amounts for the milestone payments will be recognized when it is probable that the related contingent liability has been incurred and the amount owed is reasonably estimated. No amounts for the milestone payments have been recorded during the three and six months ended June 30, 2023 and year ended December 31, 2022.

PUR Settlement

In April 2019, Private Histogen entered into a Settlement, Release and Termination Agreement (“PUR Settlement”) with PUR Biologics, LLC and its members which terminated the License, Supply and Operating Agreements between Private Histogen and PUR, eliminated Private Histogen’s membership interest in PUR and returned all in-process research and development assets to Private Histogen (the “Development Assets”). The agreement also provided indemnifications and complete releases by and among the parties. The acquisition of the Development Assets was accounted for as an asset acquisition in accordance with ASC 805-50-50, Acquisition of Assets Rather than a Business.

As consideration for the reacquisition of the Development Assets, Private Histogen compensated PUR with both equity and cash components, including 8,366 shares of Series D convertible preferred stock with a fair value of $1.75 million and a potential cash payout of up to $6.25 million (the “Cap Amount”). Private Histogen paid PUR $0.5 million in upfront cash, forgave approximately $22 thousand of accounts receivable owed by PUR to Private Histogen, and settled an outstanding payable of PUR of approximately $23 thousand owed to a third party. The Company is also obligated to make milestone and royalty payments, including (a) a $0.4 million payment upon the unconditional acceptance and approval of a New Drug Application or Pre-Market Approval Application by the FDA related to the Development Assets, (b) a $0.4 million commercialization milestone upon reaching gross sales (by the Company or licensee) of the $0.5 million of products incorporating the Development Assets, and (c) a five percent (5%) royalty on net revenues collected by the Company from commercial sales (by the Company or licensee) of products incorporating the Development Assets. The aforementioned cash payments, along with any future milestone and royalty payments, are all applied against the Cap Amount. In accordance with authoritative guidance, amounts for the milestone and royalty payments will be recognized when it is probable that the related contingent liability has been incurred and the amount owed is reasonably estimated. No amounts for the milestone and royalty payments have been recorded during the three and six months ended June 30, 2023 and year ended December 31, 2022.

JHU License Agreement

On April 3, 2023, the Company entered into an Exclusive License Agreement (the “JHU License Agreement”) with Johns Hopkins University (“Johns Hopkins”), pursuant to which Johns Hopkins granted the Company an exclusive license to certain intellectual property associated with the use of emricasan for the treatment of disease in humans resulting from viral or bacterial infections (including but not limited to, MRSA, VRSA, and SARS-CoV-2). In exchange, the Company agreed to pay Johns Hopkins an upfront license fee, reimbursement of certain patent costs, payments upon meeting certain milestones of up to $2.1 million, and royalty payments, including minimum annual royalty payments that totals $0.3 million of future payables creditable to the then current year royalties on net sales through 2033. The Company recognized expenses of $88 thousand and $106 thousand for the three and six months ended June 30, 2023, respectively, related to the upfront license fee and reimbursement of intellectual property prosecution costs. The JHU License Agreement contains customary provisions on, among other things, termination, indemnification and patent prosecution and maintenance of the licensed intellectual property portfolio. In accordance with authoritative guidance, amounts for the milestone and royalty payments will be recognized when it is probable that the related contingent liability has been incurred and the amount owed is reasonably estimated. No milestones that require milestone payments have been met and therefore no amounts for the milestone and royalty payments have been recorded during the three and six months ended June 30, 2023.

Litigation and Legal Matters

The Company is subject to claims and legal proceedings that arise in the ordinary course of business. Such matters are inherently uncertain, and there can be no guarantee that the outcome of any such matter will be decided favorably to the Company or that the resolution of any such matter will not have a material adverse effect upon the Company’s consolidated financial statements. The Company accrues a liability for such matters when it is probable that future expenditures will be made, and such expenditures can be reasonably estimated. As of June 30, 2023, no accruals have been made and no liability recognized related to such claims and legal proceedings.

Employee Litigation

On or about February 17, 2022, two former employees, each of whom separately resigned and terminated their employment with Histogen, filed a complaint in the Superior Court of California, County of San Diego against the Company, the Company’s Board of Directors, the Company’s former Chief Executive Officer, as well as three individuals, two of which are currently employed by the Company. Although the complaint lists the “Histogen Board of Directors, a business entity form unknown” as a defendant, the complaint does not specifically list the names of the board members. The plaintiffs allege whistleblower status, retaliation, discrimination, unfair business practices, wrongful termination, violation of civil rights, and other California state law claims. The Company has tendered the complaint to its liability insurer and engaged outside litigation counsel, as approved by its carrier, to defend Histogen, the Board of Directors and the individuals in this matter. The Company objects to the naming of each of the defendants in this matter and denies each of the plaintiffs’ claims. The plaintiffs agreed to pre-arbitration mediation, which was conducted on May 4, 2022, as was required by the arbitration agreement executed by each of the plaintiffs. Considering that the parties did not resolve the matter through this mediation, the Company petitioned the San Diego Superior Court for an order that the matter be submitted to arbitration consistent with each of the plaintiff’s arbitration agreements. The hearing for the motion to compel arbitration was held on August 12, 2022 and the San Diego Superior Court issued a ruling to uphold the binding arbitration agreements signed by both plaintiffs. On July 10, 2023, plaintiff’s counsel filed a formal demand for arbitration for one of the plaintiffs. On August 3, 2023, a joint stipulation was filed dismissing the former Chief Executive Officer, as well as the three individuals, two of which are currently employed by the Company. The matter is expected to proceed to arbitration but is the responsibility of the plaintiffs to follow through with the initiation of the arbitration proceeding. The Company believes that our defense costs, settlement monies, damages or any other awards would be covered by our liability insurance; provided, however, insurance may not cover all claims or could exceed our insurance coverage. The Company believes that there are substantial defenses to this lawsuit, and intends to vigorously defend against each of these claims. While this litigation matter is in the early stages, the Company believes the action is without merit. Nonetheless, the ultimate outcome is unknown at this time.

Amerimmune Collaborative Development and Commercialization Agreement Arbitration

On March 3, 2022, the Company filed a demand for arbitration (“Arbitration Demand”) with JAMS in the county of San Diego, against Amerimmune LLC (“Amerimmune”) seeking a declaratory judgment that Amerimmune has materially breached the Collaboration Agreement entered into by and between the Company and Amerimmune on October 26, 2020, and that the Company is therefore entitled to terminate the Collaboration Agreement in accordance with its terms. On November 28, 2022, the arbitrator issued an interim award in favor of the Company, granting the Company’s request for declaratory relief and specific performance terminating the Collaboration Agreement and denying each of Amerimmune’s counterclaims. On January 2, 2023, the arbitrator issued a final award affirming the arbitration outcome set forth in the interim award and further awarding the Company its costs in pursuing the arbitration. On February 9, 2023, the Company filed a petition in the Superior Court of California, County of San Diego, seeking to confirm the arbitration award. A hearing on the petition was held on May 26, 2023 at which the Superior Court of California granted the Company’s petition to confirm the arbitration award.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with (i) our unaudited condensed consolidated financial statements and related notes thereto included elsewhere in this Quarterly Report on Form 10-Q for the period ended June 30, 2023 (this “Quarterly Report”). This information should also be read in conjunction with our audited historical consolidated financial statements which are included in our Form 10-K for the fiscal year ended December 31, 2022 (“Form 10-K”). References to the Company’s operating results prior to the Merger will refer to the operating results of Private Histogen. Except as otherwise indicated herein or as the context otherwise requires, references in this Quarterly Report on Form 10-Q to “Histogen” “the Company,” “we,” “us” and “our” refer to Histogen Inc.., a Delaware corporation, on a post-Merger basis, and the term “Private Histogen” refers to the business of privately-held Histogen Inc. prior to completion of the Merger.

This Quarterly Report contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements other than statements of historical facts contained in this Quarterly Report are forward-looking statements, including statements regarding:

These statements involve known and unknown risks, uncertainties, and other important factors that may cause our actual results, performance, and achievements to be materially different from any future results, performance, or achievements expressed or implied by the forward-looking statements.

In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “could,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” or the negative of these terms or other comparable terminology. These forward-looking statements are only predictions. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition, and results of operations. These forward-looking statements speak only as of the date of this Quarterly Report and are subject to a number of risks, uncertainties, and assumptions, including those described in Part II, Item 1A, “Risk Factors.” The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. Moreover, we operate in an evolving environment. New risk factors and uncertainties may emerge from time to time, and it is not possible for management to predict all risk factors and uncertainties. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise.

We have common law trademark rights in the unregistered marks “Histogen Inc”, “Histogen”, “Histogen Therapeutics Inc.,” and the Histogen logos in certain jurisdictions. Solely for convenience, trademarks and tradenames referred to in this Quarterly Report appear without the ® and ™ symbols, but those references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or that the applicable owner will not assert its rights, to these trademarks and tradenames.

We are a clinical-stage therapeutics company focused on developing potential first-in-class clinical and preclinical small molecule pan-caspase and caspase selective inhibitors that protect the body’s natural process to restore immune function.

On July 5, 2023, we announced that the Company, post completing a review of our business, including the status of programs, resources and capabilities, has turned its primary focus to evaluation of strategic alternatives with the intent to enhance shareholder value. We have paused all product development activities and taken steps to reduce operating costs in order to preserve cash as we explore these strategic alternatives and have engaged Roth Capital Partners, LLC, to act as our strategic advisor.

Potential strategic alternatives that may be explored or evaluated as part of this process include an acquisition, merger, reverse merger, other business combination, sale of assets, financing alternatives, licensing, or other strategic transactions involving the Company. The Company’s Board of Directors has not set a timetable for the conclusion of this review, nor has it made any definitive decisions related to taking any further actions or potential strategic options at this time or at all. Despite the undertaking of this process, we may not be successful in completing a transaction, and even if a transaction is completed, it may not ultimately deliver the anticipated benefits of enhanced shareholder value. We do not intend to make any further disclosures regarding the strategic review process unless and until a specific course of action is approved by our Board of Directors or until we determine that further disclosure is appropriate.

Our product candidates include emricasan, CTS-2090 and other proprietary caspase inhibitors. We believe that emricasan has the potential to treat infections in a different way; by protecting the competence of the body’s immune system thereby restoring the body’s natural process to combat invading organisms. By focusing on optimizing the immune response, we believe that emricasan can be a viable option for physicians to treat and cure infectious diseases without the risk of generating resistance.

Emricasan impacts the three pathways of caspase regulated cell death, which are described as follows:

The emergence of methicillin-resistant S. aureus (MRSA) strains of bacteria is a serious public health threat. MRSA infections and other acute bacterial skin and skin structure infections (ABSSSI) result in 600,000 to 800,000 hospital admissions annually in the United States. We believe there is an urgent clinical need for nonantibiotic immunomodulating therapies to treat ABSSSI and MRSA infections and prevent the spread of antibiotic resistance.

The Staph aureus bacterium causes skin and soft tissue infections by specifically targeting cell death pathways in key immune cells to thwart effective immune response and maintain infection. Two main types of immune cells essential for the host immune response are hijacked and killed by methicillin resistant Staph aureus:

We believe that emricasan can reverse these negative effects on the host immune response. The goal is to bolster the host immune response to infection.

Our pipeline also includes novel preclinical product candidate CTS-2090 that is a highly selective small molecule inhibitor of caspase-1 designed for the treatment of certain infectious and inflammatory diseases.

We received notice from the FDA in March 2023 related to our recently filed IND for emricasan for the treatment of ABSSSI that the “Study May Proceed.” On July 5, 2023, we announced that we had paused all development activities to pursue evaluation of strategic alternatives with the intent to enhance shareholder value.

In June 2021, we announced top line results from the Phase 1 study of emricasan in mild symptomatic COVID-19 patients to assess safety, tolerability, and preliminary efficacy. The study demonstrated that emricasan was safe and well-tolerated during the 14 days of dosing and at the day 45 follow-up, as compared to placebo with no reports of serious adverse events. Top-line efficacy data from the Phase 1 study point to a positive impact on adaptive immune responses with 5 of 5 emricasan vs. 0 of 6 placebo having a complete resolution of symptoms at day 7, 4 of 5 emricasan vs. 1 of 6 placebo cleared the virus at day 14,

and the mean anti-COVID-19 antibody index in emricasan of 6.98 vs. 5.32 in placebo at end of study. A total of 13 subjects were consented and randomized to receive either placebo or 25 mg emricasan orally, BID for 14 days. PK samples, taken at day 14 of the study to assess compliance, revealed that one patient in the treatment arm did not show any indications of emricasan or its known metabolites in plasma, leading to a reclassification of the patient for the subsequent analysis shown in Figure 1.

Figure 1. Per-protocol analysis of time to complete resolution of symptoms. Symptoms were defined by the 14-point questionnaire recommended by the FDA for outpatient COVID-19 studies. For the first 14 days, patients had daily tele-visits. In-person follow up visits were conducted on days 14, 30 and 45. The Kaplan-Meier plots for time-to-recovery show faster recovery in patients treated with emricasan, with a median of 5 (interquartile range 4-6 days) vs 37 days (interquartile range of 30-45) for participants randomized to the placebo group. The mean number of days to recovery for patients was 4.8 days with a SD=0.83 in the emricasan arm and 37.5 days, SD=8.2 in the placebo arm (p=0.001).

Additionally, within our small molecule pipeline, we have assembled a proprietary portfolio of orally active molecules that inhibit inflammasome pathways and thus the activation of the potent inflammatory cytokine interleukin-1β, or IL-1β. Inhibition of IL-1β is a clinically validated approach to treating inflammatory diseases, with injectable biologic products using that mechanism of action already on the market. The NLRP3 inflammasome pathway, for example, is dependent upon caspase-1, which activates IL-1β. As such, caspase-1 occupies a uniquely central position in the inflammasome pathway, and we have leveraged our scientific expertise in caspase research and development to design potent, selective and orally bioavailable inhibitors of caspase-1. Excess IL-1β has been linked to a variety of diseases including rare genetic inflammatory diseases, neurological diseases, cancer, liver and other gastrointestinal diseases, and cardiovascular diseases.

CTS-2090 is a selective caspase-1 inhibitors targeting inflammasome activation and has the potential to treat a variety of inflammation mediated diseases. Inflammasomes are a collection of large multiprotein structures responsible for the activation of inflammatory responses. There are six known inflammasome subtypes - NLRP1, NLRP3, NLRC4, NLRP6, AIM2 and IFI 16 - that respond to different stimuli. A primary function of the inflammasomes is to generate active caspase-1 from procaspase 1 in response to various pathogens and other stimuli. The ultimate products produced by the activation of caspase 1 are highly pro-inflammatory cytokines, IL-1ß and IL-18. In addition, caspase 1 initiates pyroptosis, a highly inflammatory form of cell death, through the cleavage of gasdermin D. The selection of product candidate, CTS-2090, as a lead compound is based on its preclinical profile, including high selectivity for caspase-1, and drug-like properties showing a high degree of drug exposure in the intestinal track after oral administration.

Previously, our focus was on developing our proprietary hypoxia-generated growth factor technology platform and stem cell-free biologic products as potential first-in-class restorative therapeutics that ignite the body’s natural process to repair and maintain healthy biological function. In December 2022, we announced termination of our HST-003 study for futility related to patient recruitment and due to pipeline reprioritization, in the third quarter of 2022, we suspended all IND enabling activities on our HST-004 program.

While we are actively seeking collaboration partners or acquirors for our Human Multipotent Cell Conditioned Media, or CCM and our Human Extracellular Matrix, or hECM, there are no assurances that we will find a collaboration partner or acquirer for CCM or hECM or that the terms and timing of any such arrangements would be acceptable to us.

Our proprietary hypoxia-generated growth factor technology is based on the discovery that growing fibroblast cells under simulated embryonic conditions induces them to become multipotent with stem cell-like properties. The environment created by our proprietary process mimics the conditions within the womb — very low oxygen and suspension culture. When incubated under these conditions, the fibroblast cells generate biological materials, growth factors and proteins, that have the potential to stimulate a person’s own stem cells to activate and replace/regenerate damaged cells and tissue. Our proprietary manufacturing process provides targeted solutions that harness the body’s inherent regenerative power across a broad range of therapeutic indications including joint cartilage regeneration and spinal disc repair.

Our manufacturing process yields multiple biologic products from a single bioreactor, including CCM and hECM, creating a spectrum of product candidates for a variety of markets from one core technology.

In July 2010, we entered into a Stock Purchase Agreement with Pfizer pursuant to which it acquired all of the outstanding capital stock of Idun Pharmaceuticals, Inc. (“Idun”), a wholly-owned subsidiary of Pfizer at the time. Pursuant to the Stock Purchase Agreement, we are required to make additional payments to Pfizer totaling $18.0 million upon the achievement of specified regulatory milestones relating to emricasan.

In January 2013, the Company conducted a spin-off of its subsidiary Idun, which the Company had acquired from Pfizer in the transaction described above, to stockholders at that time. Immediately prior to the spin-off, all rights relating to emricasan were distributed to the Company pursuant to a distribution agreement.

As consideration for the reacquisition of the Development Assets, Private Histogen compensated PUR with both equity and cash components, including 8,366 shares of Series D convertible preferred stock with a fair value of $1.75 million and a potential cash payout of up to $6.25 million (the “Cap Amount”). Private Histogen paid PUR $0.5 million in upfront cash, forgave approximately $22 thousand of accounts receivable owed by PUR to Private Histogen, and settled an outstanding payable of PUR of approximately $23 thousand owed to a third party. The Company is also obligated to make milestone and royalty payments, including (a) a $0.4 million payment upon the unconditional acceptance and approval of a New Drug Application or Pre-Market Approval Application by the FDA related to the Development Assets, (b) a $0.4 million commercialization milestone upon reaching gross sales (by the Company or licensee) of the $0.5 million of products incorporating the Development Assets, and (c) a five percent (5%) royalty on net revenues collected by Histogen from commercial sales (by the Company or licensee) of products incorporating the Development Assets. The aforementioned cash payments, along with any future milestone and royalty payments, are all applied against the Cap Amount. In accordance with authoritative guidance, amounts for the milestone and royalty payments will be recognized when it is probable that the related contingent liability has been incurred and the amount owed is reasonably estimated. No amounts for the milestone and royalty payments have been recorded as a contingent liability at June 30, 2023 or December 31, 2022.

Our revenues to date have been generated primarily from the sale of license fees.

Our license revenue to date has been generated primarily from payments received under the Allergan Agreements.

Research and development expenses consist primarily of costs incurred for the preclinical and clinical development of our product candidates, which include:

We accrue all research and development costs in the period for which they are incurred. Costs for certain development activities are recognized based on an evaluation of the progress to completion of specific tasks using information and data provided to us by our vendors, collaborators and third-party service providers. Advance payments for goods or services to be received in future periods for use in research and development activities are deferred and then expensed as the related goods are delivered and as services are performed.

We expect our research and development expenses to decrease substantially for the foreseeable future as we have paused our product candidate development programs while we evaluate strategic alternative paths.

Our direct research and development expenses are tracked by product candidate and consist primarily of external costs, such as fees paid under third-party license agreements and to outside consultants, contract research organizations (“CROs”), contract manufacturing organizations and research laboratories in connection with our preclinical development, process development, manufacturing and clinical development activities. We do not allocate employee costs and costs associated with our discovery efforts, laboratory supplies and facilities, including other indirect costs, to specific product candidates because these costs are deployed across multiple programs

and, as such, are not separately classified. We use internal resources primarily to conduct our research as well as for managing our preclinical development, process development, manufacturing and clinical development activities. These employees work across multiple programs and, therefore, we do not track our costs by product candidate unless such costs are includable as subaward costs. The following table shows our research and development expenses by type of activity (in thousands):

We have paused our current product candidate development activities while we evaluate strategic alternative paths, and we cannot determine with certainty the timing of initiation, the duration or the completion costs of future preclinical studies and clinical trials of our product candidates due to the inherently unpredictable nature of preclinical and clinical development, including any potential expanded dosing beyond the original protocols based in part on ongoing clinical success. Clinical and preclinical development timelines, the probability of success and development costs can differ materially from expectations. We anticipate that we will make determinations as to which product candidates to pursue and how much funding to direct to each product candidate on an ongoing basis in response to the results of ongoing and future preclinical studies and clinical trials, regulatory developments and our ongoing assessments of each product candidate’s commercial potential. We will need to raise substantial additional capital in the future. In addition, we cannot forecast which product candidates may be subject to future collaborations, when such arrangements will be secured, if at all, and to what degree such arrangements would affect our development plans and capital requirements.

General and administrative expenses consist primarily of personnel-related costs, insurance costs, facility costs and professional fees for legal, patent, consulting, investor and public relations, accounting and audit services. Personnel-related costs consist of salaries, benefits, and stock-based compensation. We expect our general and administrative expenses to increase substantially as we: (i) evaluate strategic alternative paths, (ii) incur additional costs associated with being a public company, including audit, legal, regulatory, and tax-related services associated with maintaining compliance with exchange listing and SEC requirements, director and officer insurance premiums, and investor relations costs, and (iii) protect our intellectual property.

Interest income consists of interest earned on our cash equivalents, which consist of money market funds. Our interest income has not been significant due to low interest earned on invested balances.

The following table summarizes our results of operations for the three months ended June 30, 2023 and 2022 (in thousands):

For both the three months ended June 30, 2023 and 2022, we recognized license revenue of $5 thousand related to deferred revenue recognized on a straight-line basis over the remaining life of the licensing patents related to the Allergan License Agreement.

Research and development expenses for the three months ended June 30, 2023 and 2022 were $0.5 million and $1.1 million, respectively. The decrease of $0.6 million was primarily due to decreases in outsourced manufacturing facility expenses, personnel related expenses, and a reduction of development costs related to clinical and preclinical candidates.

General and administrative expenses for the three months ended June 30, 2023 and 2022 were $1.6 million and $2.3 million, respectively. The decrease of $0.7 million was primarily due to decreases in legal fees, personnel related expenses, stock-based compensation costs, insurance, and outside services.

The following table summarizes our results of operations for the six months ended June 30, 2023 and 2022 (in thousands):

For the six months ended June 30, 2023 and 2022, we recognized license revenue of $10 thousand and $3.8 million, respectively. The decrease in the current period is due to a one-time payment of $3.75 million received in March 2022 as consideration for execution of the 2022 Allergan Letter Agreement.

Research and development expenses for the six months ended June 30, 2023 and 2022 were $1.5 million and $3.0 million, respectively. The decrease of $1.5 million was primarily due to decreases in outsourced manufacturing facility expenses, personnel related expenses, and a reduction of development expenses related to clinical and preclinical candidates.

General and administrative expenses for the six months ended June 30, 2023 and 2022 were $4.0 million and $4.8 million, respectively. The decrease of $0.8 million was primarily due to decreases in legal fees, a royalty fee payable related to the Allergan Letter Agreement, insurance, personnel related expenses, and outside services, partially offset by increases in rent, stock compensation, and corporate taxes.

From inception through June 30, 2023, we had an accumulated deficit of $93.8 million and expect to incur operating losses and generate negative cash flows from operations for the foreseeable future. As of June 30, 2023, we had approximately $7.3 million in cash and cash equivalents. We believe that our existing cash and cash equivalents may not be sufficient to fund our operations for a period of at least twelve months from the date of this report without raising additional funding or making changes to operating plans to reduce expenses.

We have not yet established ongoing sources of revenues sufficient to cover our operating costs and will need to continue to raise additional capital to support our future operating activities, including progression of our development programs, preparation for potential commercialization, and other operating costs. Our plans with regard to these matters include our primary focus of evaluation of strategic alternatives which may include an acquisition, merger, reverse merger, other business combination, sale of assets, financing alternatives, licensing, or other strategic transactions involving the company. The Company’s Board of Directors has not set a timetable for the conclusion of this review, nor has it made any definitive decisions related to taking any further actions or potential strategic options at this time or at all. Despite the undertaking of this process, we may not be successful in completing a transaction, and our Board of Directors may decide to pursue a dissolution and liquidation of the Company. Even if a transaction is completed, it may not ultimately provide sufficient capital to continue operations or deliver the anticipated benefits of enhanced shareholder value. The aforementioned factors raise substantial doubt about our ability to continue as a going concern.

The condensed consolidated financial statements have been prepared assuming that we will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. Based on the current business plan to pursue strategic alternatives paths and related operating budget, there is substantial doubt about our ability to continue as a going concern within one year from the date the consolidated financial statements are issued. The condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that may result from the outcome of this uncertainty.

In January 2021, we completed an S-1 offering (the “January 2021 Offering”) of an aggregate of 580,000 shares of common stock, pre-funded warrants to purchase up to 120,000 shares of its common stock, and common stock warrants to purchase up to an aggregate of 700,000 shares of common stock. To the extent that an investor determines, at their sole discretion, that they would beneficially own in excess of the Beneficial Ownership Limitations (or as such investor may otherwise choose), in lieu of purchasing shares of common stock and common stock warrants, such investor could have elected to purchase pre-funded warrants and common stock warrants at the pre-funded purchase price in lieu of the shares of common stock and common stock warrants in such a manner to result in the same aggregate purchase price being paid by such investor to the Company. The combined purchase price of one share of common stock and the accompanying common stock warrant was $20.00, and the combined purchase price of one pre-funded warrant and accompanying common stock warrant was $19.998. The common stock warrants are exercisable for five (5) years at an exercise price of $20.00 per share. The pre-funded warrants were immediately exercisable at an exercise price of $0.002 per share and were exercisable at any time until all of the pre-funded warrants are exercised in full. Placement agent warrants were issued to purchase up to 35,000 shares of common stock, are immediately exercisable for an exercise price of $25.00, and are exercisable for five (5) years following the date of issuance. We received gross proceeds of $14.0 million and incurred placement agent’s fees and other offering expenses of approximately $1.9 million.

As of June 30, 2023, a total of 336,060 warrants issued in the January 2021 Offering to purchase shares of common stock have been exercised and we issued 336,060 shares of its common stock. We received gross proceeds of approximately $6.8 million.

As of June 30, 2023, we had 387,565 shares and 11,375 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by us in the January 2021 Offering, at an exercise price of $20.00 per share and $25.00 per share, respectively.

In June 2021, we completed a registered direct offering (the “June 2021 Offering”) of an aggregate of 298,865 shares of common stock, together with accompanying warrants to purchase up to an aggregate of 239,093 shares of common stock, at a public offering price of $22.00 per share. The accompanying warrants permit the investor to purchase additional shares equal to 80% of the number of shares of our common stock purchased by the investor. The warrants have an exercise price of $20.00 per share, are immediately exercisable, and expire five and a half (5.5) years following the date of issuance. In addition, our placement agent was issued compensatory warrants equal to 5.0%, or 14,946 shares, of the aggregate number of common stock sold in the offering, which are immediately exercisable for

an exercise price of $27.50 and expire five (5) years following the date of issuance on June 7, 2026. We received gross proceeds of $6.6 million and incurred cash-based placement agent fees and other offering expenses of approximately $0.9 million.

As of June 30, 2023, no warrants associated with the June 2021 Offering have been exercised.

As of June 30, 2023, we had 90,910 shares and 14,946 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by us in the June 2021 Offering, at an exercise price of $20.00 per share and $27.50 per share, respectively. In connection with the July 2022 Offering, we agreed to amend warrants, by reducing the exercise price and extending the expiration date, to purchase up to an aggregate of 148,183 shares of our common stock that were originally issued to the investor in the June 2021 Offering.

In December 2021, we completed a registered direct offering (the “December 2021 Offering”) of an aggregate of 411,764 shares of common stock and 411,766 warrants to purchase up to 411,766 shares of common stock, at a public offering price of $8.50 per share. The accompanying warrants permit the investor to purchase additional shares equal to approximately the same number of shares of our common stock purchased by the investor. The warrants have an exercise price of $8.50 per share, may be exercised any time on or after 6 months and one (1) day after the issuance date, and expire five and a half (5.5) years following the date of issuance. In addition, the placement agent was issued compensatory warrants equal to 5.0%, or 20,590 shares, of the aggregate number of shares of common stock sold in the offering, which are immediately exercisable for an exercise price of $10.626 and expire five and a half (5.5) years following the date of issuance on June 21, 2027. We received gross proceeds of $3.5 million and incurred cash-based placement agent fees and other offering expenses of approximately $0.5 million.

As of June 30, 2023, no warrants associated with the December 2021 Offering have been exercised.

As of June 30, 2023, we had 164,707 shares and 20,590 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by us in the December 2021 Offering, at an exercise price of $8.50 per share and $10.626 per share, respectively. In connection with the July 2022 Offering, we agreed to amend warrants, by reducing the exercise price and extending the expiration date, to purchase up to an aggregate of 247,059 shares of our common stock that were originally issued to the investor in the December 2021 Offering.

On July 12, 2022, we entered into a Securities Purchase Agreement (the “July 2022 Purchase Agreement”) with a single healthcare-focused institutional investor for the sale by us of (i) a pre-funded warrant to purchase up to 1,774,309 shares of Common Stock (the “Pre-Funded Warrant”), (ii) a Series A warrant to purchase up to an aggregate of 1,774,309 shares of common stock (the “Series A Warrant”), and (iii) a Series B warrant to purchase up to an aggregate of 1,774,309 shares of common stock (the “Series B Warrant,” and together with the Pre-Funded Warrant and the Series A Warrant, the “Warrants”), in a private placement offering (the “Offering”). The combined purchase price of one Pre-Funded Warrant and accompanying Series A Warrant and accompanying Series B Warrant was $2.818.

Subject to certain ownership limitations, the Series A Warrant is exercisable immediately after the issuance date at an exercise price equal to $2.568 per share of common stock, subject to adjustments as provided under the terms of the Series A Warrant, and has a term of five and a half (5.5) years from the issuance date. Subject to certain ownership limitations, the Series B Warrant is exercisable immediately after the issuance date at an exercise price equal to $2.568 per share of common stock, subject to adjustments as provided under the terms of the Series B Warrant, and has a term of one and a half (1.5) years from the issuance date. Subject to certain ownership limitations described in the Pre-Funded Warrant, the Pre-Funded Warrant was immediately exercisable and may be exercised at an exercise price of $0.0001 per share of common stock any time until all of the Pre-Funded Warrant is exercised in full. As of June 30, 2023, the Pre-Funded Warrant to purchase up to an aggregate of 1,774,309 shares of common stock had been fully exercised and the Company issued 1,774,309 shares of common stock.

We also agreed to amend certain warrants to purchase up to an aggregate of 447,800 shares of our common stock that were issued to the investor in the private placement in November 2020, June 2021 and December 2021 with exercise prices ranging from $8.50 to $34.00 per share and expiration dates ranging from May 18, 2026 to June 21, 2027, so that such warrants have a reduced exercise price of $2.568 per share and expiration date of five and a half (5.5) years following the closing of the private placement, for an additional offering price of $0.0316 per amended warrant. The incremental fair value resulting from the modifications to the warrants was adjusted against the gross proceeds from the offering as an equity issuance cost.

The gross proceeds to us were approximately $5 million, before deducting the placement agent’s fees and other offering expenses, and excluding the proceeds, if any, from the exercise of the Series A Warrant, the Series B Warrant, and amended warrants.

As of June 30, 2023, no warrants associated with the July 2022 Purchase Agreement have been exercised.

As of June 30, 2023, we had 3,996,418 shares and 124,202 shares of common stock reserved for issuance pursuant to the warrants and placement agent’s warrants, respectively, issued by us in the July 2022 Purchase Agreement, at an exercise price of $2.568 per share and $3.5225 per share, respectively.

In July 2020, we entered into a common stock purchase agreement (the “2020 Purchase Agreement”) with Lincoln Park which provided that, upon the terms and subject to the conditions and limitations in the 2020 Purchase Agreement, Lincoln Park was committed to purchase up to an aggregate of $10.0 million of shares of our common stock at our request from time to time during a 24 month period that began in July 2020 and at prices based on the market price of our common stock at the time of each sale. Upon execution of the 2020 Purchase Agreement, we sold 16,425 shares of common stock at $60.88 per share to Lincoln Park for gross proceeds of $1.0 million. During the year ended December 31, 2020, we sold an additional 15,000 shares of common stock to Lincoln Park for gross proceeds of approximately $0.5 million. In addition, in consideration for entering into the 2020 Purchase Agreement and concurrently with the execution of the 2020 Purchase Agreement, we issued 3,348 shares of its common stock to Lincoln Park. The 2020 Purchase Agreement expired automatically pursuant to its term on August 1, 2022, and, as of such expiration, we could not, and have not, sold any additional shares of common stock to Lincoln Park pursuant to the 2020 Purchase Agreement.

See warrant discussion above in connection with the January 2021 Offering, the June 2021 Offering, the December 2021 Offering, and the July 2022 Offering.

The following table shows a summary of our cash flows for the six months ended June 30, 2023 and 2022 (in thousands):

Net cash used in operating activities was $5.0 million for the six months ended June 30, 2023, resulting from our net loss of $5.6 million, which included total non-cash charges of $0.5 million related primarily to stock-based compensation, and depreciation and amortization, coupled with a $0.1 million change in our operating assets and liabilities.

Net cash used in operating activities was $4.8 million for the six months ended June 30, 2022, resulting from our net loss of $4.1 million, which included total non-cash charges of $0.3 million related to stock-based compensation, and depreciation and amortization, coupled with a $1.0 million change in our operating assets and liabilities.

Net cash provided by investing activities was $1 thousand for the six months ended June 30, 2023, which was related to the sale of a wholly owned subsidiary.

Net cash used by investing activities was $0.2 million for the six months ended June 30, 2022, which was related to the purchase of property and equipment.

Net cash used by financing activities was $5 thousand for the six months ended June 30, 2023, related to repayment of finance lease obligations.

Net cash used by financing activities was $1.1 million for the six months ended June 30, 2022, primarily related to $0.6 million of issuance costs resulting from the issuance and sale of our redeemable convertible preferred stock in a private placement offering, and $0.5 million related to the redemption premium paid to repurchase the redeemable convertible preferred stock.

Our future success is largely dependent on our ability to identify and ultimately consummate a strategic transaction. Potential strategic alternatives to be explored and evaluated during the review process might include, among other things, acquisition, merger, reverse merger, other business combination, sale of assets, financing alternatives, licensing, or other strategic transactions involving the company. We are actively working with Roth Capital Partners, LLC in this strategic alternative assessment process. We expect to continue to incur expenses and operating losses for the foreseeable future in order to operate as a public company and support the evaluation of strategic alternatives.

We are subject to a number of risks similar to other clinical companies that have determined to focus primarily on pursuing a strategic transaction, including, but not limited to, those which are described under Part II Item 1A. Risk Factors of this Quarterly Report on Form 10-Q. We will incur substantial expenses if and as we:

Pending our ability to consummate a strategic alternative or finance future cash needs through public or private equity offerings, debt financings or corporate collaboration and licensing arrangements, if ever, our Board of Directors may decide to pursue a dissolution and liquidation of our Company. To the extent we are successful in consummating a strategic alternative transaction, the ownership interest of our stockholders will be or could be diluted, and the terms of transaction may include liquidation or other preferences that adversely affect the rights of our common stockholders. If as part of our strategic alternative process, we raise funds through collaborations, licenses and other similar 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 and/or may reduce the value of our common stock. There can be no assurance that we will be able to consummate a strategic transaction or obtain any sources of financing on acceptable terms, or at all. Based on the current business plan to pursue strategic alternatives paths and related operating budget, there is substantial doubt about our ability to continue as a going concern within one year from the date the condensed consolidated financial statements are issued.

Our discussion and analysis of our financial condition and results of operations is based on our condensed consolidated financial statements, which have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”). The preparation of these condensed consolidated financial statements requires us to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of the date of the balance sheet and the reported amounts of expenses during the reporting period. On an ongoing basis, we evaluate our estimates and judgments, including those related to accrued research and development expenses and stock-based compensation. Our estimates are based on historical trends and other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We consider our critical accounting policies and estimates to be related to stock-based compensation. While our significant accounting policies are described in more detail in our financial statements, we believe these accounting policies and estimates to be most critical to the judgments and estimates used in the preparation of our financial statements. There have been no material changes to our critical accounting policies and estimates during the three and six months ended June 30, 2023 from those disclosed in “Histogen’s Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies,” included in the 2022 Annual Report on Form 10-K.

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined in Item 303(a)(4)(ii) of Regulation S-K under the Exchange Act.

There have been no material changes during the six months ended June 30, 2023 to our contractual obligations disclosed in our “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in the 2022 Annual Report on Form 10-K.

We are a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and are not required to provide the information required under this item.

We maintain disclosure controls and procedures designed to provide reasonable assurance of achieving the objective that information in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified and pursuant to the requirements of the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosures. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As required by SEC Rule 13a-15(b), we carried out an evaluation, with the participation of our Management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures as of June 30, 2023, the end of the period covered by this report. Based upon the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at a reasonable assurance level as of June 30, 2023.

There were no changes in our internal control over financial reporting during our last fiscal quarter that have materially affected or are reasonably likely to materially affect our internal control over financial reporting.

Management recognizes that a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud or error, if any, have been detected. These inherent limitations include the realities that judgments in decision making can be faulty, and that breakdowns can occur because of a simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

On or about February 17, 2022, two former employees, each of whom separately resigned and terminated their employment with Histogen, filed a complaint in the Superior Court of California, County of San Diego against us, our Board of Directors, our former Chief Executive Officer, as well as three individuals, two of which are currently employed by the Company. Although the complaint lists the “Histogen Board of Directors, a business entity form unknown” as a defendant, the complaint does not specifically list the names of the board members. The plaintiffs allege whistleblower status, retaliation, discrimination, unfair business practices, wrongful termination, violation of civil rights, and other California state law claims. We have tendered the complaint to our liability insurer and engaged outside litigation counsel, as approved by our carrier, to defend Histogen, the Board of Directors and the individuals in this matter. We object to the naming of each of the defendants in this matter and deny each of the plaintiffs’ claims. The plaintiffs agreed to pre-arbitration mediation, which was conducted on May 4, 2022, as was required by the arbitration agreement executed by each of the plaintiffs. Considering that the parties did not resolve the matter through this mediation, the Company petitioned the San Diego Superior Court for an order that the matter be submitted to arbitration consistent with each of the plaintiff’s arbitration agreements. The hearing for the motion to compel arbitration was held on August 12, 2022 and the San Diego Superior Court issued a ruling to uphold the binding arbitration agreements signed by both plaintiffs. On July 10, 2023, plaintiff’s counsel filed a formal demand for arbitration for one of the plaintiffs. On August 3, 2023, a joint stipulation was filed dismissing the former Chief Executive Officer, as well as the three individuals, two of which are currently employed by the Company. The matter is expected to now proceed to arbitration but is the responsibility of the plaintiffs to follow through with the initiation of the arbitration proceeding. We believe that our defense costs, settlement monies, damages or any other awards would be covered by our liability insurance; provided, however, insurance may not cover all claims or could exceed our insurance coverage. We believe that there are substantial defenses to this lawsuit, and we intend to vigorously defend against each of these claims. While this litigation matter is in the early stages, we believe the action is without merit. Nonetheless, the ultimate outcome is unknown at this time.

Amerimmune Collaborative Development and Commercialization Agreement Arbitration

On March 3, 2022, we filed a demand for arbitration (“Arbitration Demand”) with JAMS in the county of San Diego, against Amerimmune LLC (“Amerimmune”) seeking a declaratory judgment that Amerimmune had materially breached the Collaboration Agreement entered into by and between us and Amerimmune on October 26, 2020, and that we are therefore entitled to terminate the Collaboration Agreement in accordance with its terms. On November 28, 2022, the arbitrator issued an interim award in favor of the Company, granting the Company’s request for declaratory relief and specific performance terminating the Collaboration Agreement and denying each of Amerimmune’s counterclaims. On January 2, 2023, the arbitrator issued a final award affirming the arbitration outcome set forth in the interim award and further awarding the Company its costs in pursuing the arbitration. On February 9, 2023, the Company filed a petition in the Superior Court of California, County of San Diego, seeking to confirm the arbitration award. A hearing on the petition was held on May 26, 2023 at which the Superior Court of California granted the Company’s petition to confirm the arbitration award.

We are providing the following summary of the risk factors contained in this Quarterly Report on Form 10-Q to enhance the readability and accessibility of our risk factor disclosures. This summary does not address all of the risks that we face. We encourage you to carefully review the full risk factors contained in this Quarterly Report on Form 10-Q in their entirety for additional information regarding the material factors that make an investment in our securities speculative or risky. The primary categories by which we classify risks include those related to: (i) our business and FDA Regulation, (ii) our intellectual property, and (iii) owning our common stock. Set forth below within each of these categories is a summary of the principal factors that make an investment in our common stock speculative or risky.

Investing in our securities involves a high degree of risk. You should carefully consider the following risks factors, together with all of the other information included or incorporated by reference in this Quarterly Report on Form 10-Q, including our condensed consolidated financial statements and the related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” The risks described below are material risks currently known, expected or reasonably foreseeable by us. However, the risks described below are not the only ones that we face. Additional risks not presently known to us or that we currently deem immaterial may also affect our business, operating results, prospects, or financial condition. If any of these risks actually materialize, our business, prospects, financial condition, and results of operations could be seriously harmed. This could cause the trading price of our common stock to decline, resulting in a loss of all or part of your investment.

Our exploration of alternative strategic paths may not result in entering into or completing a transaction, and the process of reviewing alternative strategic paths or its conclusion could adversely affect our stock price.

As previously announced, we are evaluating alternative strategic paths focused on maximizing shareholder value. Potential strategic alternatives that may be explored or evaluated as part of this process include an acquisition, merger, reverse merger, other business combination, sale of assets, financing alternatives, licensing, or other strategic transactions involving the company. The company does not intend to make any further disclosures regarding the strategic review process unless and until a specific course of action is approved by the company’s Board of Directors or until the company determines that further disclosure is appropriate.

We have paused all product development activities and taken steps to reduce operating costs in order to preserve cash as we explore these strategic alternatives.

There can be no assurance any transaction will result from the Company’s evaluation of alternative strategic paths. Any potential transaction would be dependent on a number of factors that may be beyond our control, including, among other things, market conditions, industry trends, the interest of third parties in a potential transaction with us, obtaining stockholder approval and the availability of financing to third parties in a potential transaction with us on reasonable terms. The process of reviewing alternative strategic paths may be time consuming and may involve the dedication of significant resources and may require us to incur significant costs and expenses.

It could negatively impact our ability to attract, retain and motivate key employees, and expose us to potential litigation in connection with this process or any resulting transaction. If we are unable to effectively manage the process, our financial condition and results of operations could be adversely affected. In addition, speculation regarding any developments related to the review of strategic alternatives and perceived uncertainties related to the future of our Company could cause our stock price to fluctuate significantly. Further, any alternative strategic path that may be pursued and completed ultimately may not deliver the anticipated benefits or enhance shareholder value. There can be no guarantee that the process of evaluating alternative strategic paths will result in our Company entering into or completing a potential transaction within the anticipated timing or at all.

If we do not successfully complete a strategic transaction, our Board of Directors may decide to pursue a dissolution and liquidation of our Company. In such an event, the amount of cash available for distribution to our stockholders, if any, will depend heavily on the timing of such liquidation as well as the amount of cash that will need to be reserved for commitments and contingent liabilities.

There can be no guarantee that the process to identify a strategic transaction will result in a successfully completed transaction. In addition, potential strategic alternatives that require stockholder approval may not be approved by our stockholders. If no transaction is completed, our Board of Directors may decide that it is in the best interest of our stockholders to dissolve our Company and liquidate our assets. In that event, the amount of cash available for distribution to our stockholders, if any, will depend heavily on the timing of such decision and, ultimately, such liquidation since the amount of cash available for distribution continues to decrease as we fund our operations and evaluate our strategic alternatives. In addition, if our Board were to approve and recommend, and our stockholders were to approve, a dissolution, liquidation, bankruptcy, winding up or similar transaction of our Company, we would be required under Delaware corporate law to pay our outstanding obligations, as well as to make reasonable provision for contingent and unknown obligations, prior to making any distributions in liquidation or similar proceeding to our stockholders. As a result of this requirement, a portion of our assets may need to be reserved pending the resolution of such obligations. In addition, we may be subject to litigation or other claims related to a dissolution and liquidation of our Company. If a dissolution, liquidation, bankruptcy or similar transaction were pursued, our Board, in consultation with its advisors, would need to evaluate these matters and make a determination about a reasonable amount to reserve. Accordingly, holders of our common stock could lose all or a significant portion of their investment in the event of a dissolution, liquidation, bankruptcy, winding up or similar transaction of our Company.

We are pursuing a strategic alternative transaction that could impact our liquidity, increase our expenses and present significant distractions to our management.

Any such transaction may require us to incur non-recurring or other charges, may increase our near- and long-term expenditures and may pose significant integration challenges or disrupt our management or business, which could adversely affect our business, financial condition and results of operations. For example, these transactions may entail numerous operational and financial risks, including:

Accordingly, although there can be no assurance that we will be successful in completing a strategic alternative transaction, any transactions that we do complete may be subject to the foregoing or other risks and could have a material adverse effect on our business, financial condition and results of operations.

Our ability to consummate a strategic alternative depends on our ability to retain our employees required to consummate such transaction.

Our ability to consummate a strategic alternative depends upon our ability to retain our employees required to consummate such a transaction, the loss of whose services may adversely impact the ability to consummate such transaction. Currently, we have only six

full-time employees. If we are unable to successfully retain these employees, we are at risk of a disruption to our exploration and consummation of a strategic alternative as well as business operations.

We must raise additional funds to finance our operations to remain a going concern.

As of June 30, 2023, the Company has an accumulated deficit of $93.8 million and expects to incur operating losses and generate negative cash flows from operations for the foreseeable future. As of June 30, 2023, we had approximately $7.3 million in cash and cash equivalents. Based on our current business plan and related operating budget, there is substantial doubt about the Company’s ability to continue as a going concern within one year from the date the condensed consolidated financial statements are issued without raising additional funding or making changes to operating plans to reduce expenses.

We have not yet established ongoing sources of revenues sufficient to cover our operating costs. To the extent that we are unable to consummate a strategic transaction or proceed with a dissolution and liquidation type of proceeding, and decide to continue future operating activities, including progression of our development programs, preparation for potential commercialization, and other operating costs we will need to raise additional capital. As announced, we are exploring a strategic transaction. Despite the undertaking of this process, we may not be successful in completing a transaction, and our Board of Directors may decide to pursue a dissolution and liquidation of the Company. Even if a transaction is completed, it may not ultimately provide sufficient capital to continue operations or deliver the anticipated benefits of enhanced shareholder value. The aforementioned factors raise substantial doubt about our ability to continue as a going concern.

There can be no assurance that we will be able to obtain additional financing or enter into one of these strategic transactions on terms acceptable to us, on a timely basis or at all. Further, any failure of such potential transaction to achieve the anticipated results could significantly impair our ability to enter into any future strategic transactions and may significantly decrease the remaining cash available for use in our business. In addition, changing circumstances may cause us to increase our spending significantly faster than we currently anticipate, and we may need to spend more money than currently expected because of circumstances beyond our control.

The condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. Based on the current business plan to pursue strategic alternatives and related operating budget, there is substantial doubt about the Company’s ability to continue as a going concern within one year from the date the condensed consolidated financial statements are issued. The condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that may result from the outcome of this uncertainty.

Our independent registered public accounting firm has expressed substantial doubt about our ability to continue as a going concern, which may hinder our ability to obtain future financing.

Our condensed consolidated financial statements as of June 30, 2023 were prepared under the assumption that we will continue as a going concern for the next twelve months. Due to our recurring losses from operations, we concluded that there is substantial doubt in our ability to continue as a going concern within one year after the financial statements are issued without additional capital becoming available. Our independent registered public accounting firm issued an audit opinion on the Company’s audited consolidated financial statements for the year ended December 31, 2022 included in the Annual Report on Form 10-K that the Company filed with the SEC on March 9, 2023, that included an explanatory paragraph expressing substantial doubt in our ability to continue as a going concern without additional capital becoming available. Our ability to continue as a going concern is dependent upon our ability to obtain additional equity or debt financing, attain further operating efficiencies, reduce expenditures, and, ultimately, to generate revenue. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.

We will need to raise additional capital in the event that we do note consummate a strategic transaction or proceed with a dissolution and liquidation or similar proceeding; however, three is a strong likelihood that it may be unavailable to us or, even if capital is obtained, may cause dilution or place significant restrictions on our ability to operate our business.

Our operations have required substantial amounts of cash since inception. To date, we have funded our operations primarily through the sale of our preferred and common stock. Should we be unsuccessful in pursuing a strategic transaction or otherwise proceed with a dissolution and liquidation or similar proceeding and pursue further development of our product candidates, we will need to raise additional capital. There is a strong likelihood that additional capital is unavailable to us. At the time we paused clinical development, we were advancing one product candidate through clinical development, and have other product candidates in preclinical development, as well as early-stage research projects. Developing our product candidates is expensive, and funding our early-stage research projects and advancing our programs through preclinical and clinical development requires substantial amounts of funding. Even if we decided to further develop our product candidates and were successful in developing our product candidates, obtaining regulatory approvals and potentially launching and commercializing any product candidate will require substantial additional funding. Since we will be unable to

generate sufficient, if any, cash flow to fund our operations for the foreseeable future, we will need to seek additional equity or debt financing to provide the capital required to maintain or expand our operations.

There can be no assurance that we will be able to raise sufficient additional capital on acceptable terms or at all. If we decided to pursue additional financing, such financing may not be available on satisfactory terms, or may not be available in sufficient amounts, we could significantly delay, scale back or discontinue our research and development programs or the commercialization of any product candidates, if approved, or causes us to be unable to continue or expand our operations or otherwise capitalize on our business opportunities, as desired, which could materially affect our business, financial condition, results of operations, growth prospects and cause the price of our common stock to decline. In addition, we may be required to grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves. Our inability to fund our business could lead to the loss of your investment.

If we raise additional capital by issuing common stock, or any other equity securities or securities convertible into equity, the percentage ownership of our existing stockholders may be reduced, and accordingly these stockholders may experience substantial dilution. We may also issue equity securities that provide for rights, preferences and privileges senior to those of our common stock. Given our need for cash and that equity issuances are the most common type of fundraising for similarly situated companies, the risk of dilution is particularly significant for our stockholders.

Further, SEC regulations limit the amount of funds we can raise during any 12-month period pursuant to our shelf registration statement on Form S-3. We are currently subject to General Instruction I.B.6 to Form S-3, or the Baby Shelf Rule, and the amount of funds we can raise through primary public offerings of securities in any 12-month period using our registration statement on Form S-3 is limited to one-third of the aggregate market value of the voting and non-voting common equity held by non-affiliates. We are currently limited by the Baby Shelf Rule as of the filing of this Quarterly Report on Form 10-Q, until such time as our public float exceeds $75 million. If we are required to file a new registration statement on another form, we may incur additional costs and be subject to delays due to review by SEC staff.

If we fail to retain current members of our senior management and scientific personnel, or to attract and keep additional key personnel, we may be unable to successfully develop or commercialize our product candidates in the event that we are unsuccessful in completing a strategic alternative or otherwise pursue a dissolution and liquidation or similar proceeding.

Should we be unsuccessful in pursuing a strategic alternative or otherwise pursue a dissolution and liquidation or similar proceeding, our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends on our continued ability to attract, retain, and motivate highly qualified management and scientific personnel. Competition for qualified personnel is intense especially for a company facing liquidity and other operation challenges as ours. Attracting qualified personnel to fulfill our current or future needs will be a challenge and there is no guarantee that any of these individuals will join us on a full-time employment basis, or at all. We do not maintain “key person” insurance on any of our employees.

In addition, competitors and others are likely in the future to attempt to recruit our employees. The loss of the services of any of our key personnel, the inability to attract or retain highly qualified personnel in the future or delays in hiring such personnel, particularly senior management, and other technical personnel, could materially and adversely affect our business, financial condition, and results of operations.

Our common stock may be delisted from Nasdaq if we fail to comply with Nasdaq’s continued listing requirements, the failure of which could lead to the delisting of our common stock from Nasdaq and our common stock trading, if at all, only on the over-the-counter market, or OTC market.

We must continue to satisfy the Nasdaq Capital Market’s continued listing requirements, including, among other things, the corporate governance requirements, and the minimum closing bid price requirement. If we fail to satisfy the continued listing requirements of Nasdaq, which we have in the past, Nasdaq may take steps to delist our common stock. While we currently are in compliance with the Nasdaq listing rules, if we fail in the future to comply with Nasdaq listing rules, it could lead to the delisting of our common stock from Nasdaq and our common stock trading, if at all, only on the over-the-counter market, or OTC market.

If we fail to maintain our listing on Nasdaq, it would likely have a negative effect on the price of our common stock and would impair your ability to sell or purchase our common stock when you wish to do so. Delisting from Nasdaq could also result in negative publicity and could also make it more difficult for us to complete a strategic transaction or raise additional capital. The absence of such a listing may adversely affect the acceptance of our common stock as currency or the value accorded by other parties. Further, if we are delisted, we would also incur additional costs under state blue sky laws in connection with any sales of our securities. These requirements could severely limit the market liquidity of our common stock and the ability of our stockholders to sell our common stock in the secondary market. If our common stock is delisted by Nasdaq, our common stock may be eligible to trade on an over-the-counter quotation system,

such as the OTCQB market, where an investor may find it more difficult to sell our common stock or obtain accurate quotations as to the market value of our common stock. We cannot assure you that our common stock, if delisted from Nasdaq, will be listed on another national securities exchange or quoted on an over-the counter quotation system. If our common stock is delisted, it may come within the definition of “penny stock” as defined in the Exchange Act, and would be covered by Rule 15g-9 of the Exchange Act. That Rule imposes additional sales practice requirements on broker-dealers who sell securities to persons other than established customers and accredited investors. For transactions covered by Rule 15g-9, the broker-dealer must make a special suitability determination for the purchaser and receive the purchaser’s written agreement to the transaction prior to the sale. Consequently, Rule 15g-9, if it were to become applicable, would affect the ability or willingness of broker-dealers to sell our securities, and accordingly would affect the ability of stockholders to sell their securities in the public market. These additional procedures could also limit our ability to raise additional capital in the future.

As previously announced, we are evaluating alternative strategic paths and have paused all product development activities and taken steps to reduce operating costs in order to preserve cash as we explore these strategic alternatives. In the event that we are unable to successfully complete a strategic transaction, our Board of Directors may decide that it is in the best interest of our stockholders to dissolve our Company and liquidate our assets. Any future development by us of our products candidates is remote at this time. The following risks related to our business and industry are included in the unlikely event that we are able to raise capital and continue to develop our product candidates.

We are a clinical-stage development company, have a very limited operating history, are not currently profitable, do not expect to become profitable in the near future and may never become profitable.

We are a clinical-stage biopharmaceutical company, have no approved products and have generated minimal revenues from the sale of products. We were previously focused on developing potential first-in-class clinical and preclinical small molecule pan-caspase and caspase selective inhibitors that protect the body’s natural process to restore immune function. Our product candidates include emricasan, CTS-2090 and other caspase inhibitors. Our primary focus at this time is exploring and evaluating strategic alternatives.

Our operations to date have been limited to organizing, staffing, and financing our company, applying for patent rights, manufacturing on a clinical scale, undertaking clinical trials of our product candidates, and engaging in research and development. As a result, we have limited historical operations upon which to evaluate our business and prospects and have not yet demonstrated an ability to obtain marketing approval for any of our product candidates or successfully overcome the risks and uncertainties frequently encountered by companies in the biopharmaceutical industry. We also have generated limited revenues from licensing agreements or product sales to date and continue to incur significant research and development and other expenses. As a result, we have not been profitable and have incurred significant operating losses in every reporting period since our inception, except for the year ended December 31, 2017. For the six months ended June 30, 2023 and for the years ended December 31, 2022 and 2021, we reported net losses of $5.6 million, $10.6 million, and $15.0 million, respectively, and had an accumulated deficit of $93.8 million as of June 30, 2023. We expect to continue to incur expenses and operating losses for the foreseeable future in order to operate as a public company and support the evaluation of strategic alternatives.

We cannot be certain that we will continue development of any of our product candidates or that any of them will receive regulatory approval or be commercialized.

At the time of pausing clinical development, we previously had one product candidate in development, emricasan, for acute bacterial skin and skin structure infections (ABSSSI), and we were also evaluating its use for other infectious diseases. We had also previously been focused on developing HST-003 for the treatment of articular cartilage defects in the knee and HST-004 for the spine, and stopped development activities following our strategic pipeline review in late 2022. To date, we have spent significant time, money, and effort on the development of our product candidates, emricasan, HST-003, HST-004, and other pre-clinical assets. To date, no pivotal clinical trials designed to provide clinically and statistically significant proof of efficacy, or to provide sufficient evidence of safety to justify approval, have been completed with any of our product candidates. Success in preclinical studies and early clinical trials does not ensure that later clinical trials will generate adequate data to demonstrate the efficacy and safety of a therapeutic candidate.

There is no guarantee that any future clinical trials will resume and, if resumed, completed in a timely fashion or succeed. For example, we have experienced delays in enrollment of patients in our clinical trials due to the COVID-19 pandemic. Our ability ultimately to reach profitability is critically dependent on our future success in obtaining regulatory approval and/or commercialization for our product candidates. However, there can be no guarantee that any future clinical trials will be timely commenced, successful, or that regulators will approve our product candidates in a timely manner, or at all. None of our product candidates have been approved for marketing or are being marketed or commercialized at this time.

We do not anticipate that any of our current product candidates will be eligible to receive regulatory approval from the FDA or comparable foreign authorities and begin commercialization for a number of years, if ever. Even if we ultimately receive regulatory approval for any of these product candidates, we or our current or potential future partners, if any, may be unable to commercialize them successfully for a variety of reasons. These include, for example, the availability of alternative treatments, lack of cost-effectiveness, the cost of manufacturing the product on a commercial scale and competition with other drugs or therapies. The success of our product candidates may also be limited by the prevalence and severity of any adverse side effects. If we fail to commercialize one or more of our current product candidates, we may be unable to generate sufficient revenues to attain or maintain profitability, and our financial condition and stock price may decline.

The termination of our Collaboration Agreement with Amerimmune resulted in all rights to emricasan being returned to us. Any further development of emricasan will require significant resources from us or another collaboration partner, and in the event that we do not find a collaboration partner, the development of emricasan could be significantly delayed or result in the discontinuation of the development of emricasan.

In late 2022, in accordance with an arbitration award, we terminated the Amerimmune Collaboration Agreement and all rights to emricasan, CTS-2090, and CTS-2096 were returned to us. Further development of emricasan will require significant resources from us or another collaboration partner. We or a new collaboration partner will be responsible for funding any new emricasan development and clinical trial activities undertaken after the termination. Any such further development will require significant resources to develop and commercialize emricasan, and such further development may not be possible in the near term without a new collaboration partner. There are no assurances that we will have access to additional capital or find a new collaboration partner or that the terms and timing of any such arrangements would be acceptable to us. As a result, we could experience a significant delay in the emricasan development process. If we determine instead to discontinue the development of emricasan, we will not receive any future return on our investment from that product candidate.

We are involved, and may become involved in the future, in disputes and other legal proceedings that, if adversely decided or settled, could materially and adversely affect our business, financial condition and results of operations.

We are, and may in the future become, party to litigation, arbitration, or other disputes. In general, claims made by or against us in disputes and other legal or regulatory proceedings can be expensive and time consuming to bring or defend against, requiring us to expend significant resources and divert the efforts and attention of our management and other personnel from our business operations. These potential claims include, but are not limited to, personal injury claims, class action lawsuits, intellectual property claims, employment litigation and regulatory investigations and causes of action relating to the advertising and promotional claims about our products.

Any adverse determination against us in these proceedings, or even the allegations contained in the claims, regardless of whether they are ultimately found to be without merit, may also result in settlements, injunctions or damages that could have a material adverse effect on our business, financial condition and results of operations.

Employee litigation and unfavorable publicity could negatively affect our future business.

From time to time, companies become involved in employment related litigation, including claims of age discrimination, sexual harassment, gender discrimination, creating a hostile workplace, retaliation, wrongful termination, immigration violations, or other local, state, and federal labor law violations. In recent years, there has been an increase in the number of discrimination and harassment claims generally. Coupled with the expansion of social media platforms and similar devices that allow individuals access to a broad audience, these claims have had a significant negative impact on some businesses. Certain companies that have faced employment or harassment related lawsuits have had to terminate management or other key personnel, and have suffered reputational harm that has negatively impacted their business. Any employment-related claim could negatively affect our business.

On or about February 17, 2022, two former employees, each of whom separately resigned and terminated their employment with us, filed a complaint in the Superior Court of California, County of San Diego against us, our Board of Directors and certain other of our current and prior employees. The former non-executive employees of the Company have asserted causes of action for whistleblower status, retaliation, discrimination, unfair business practices, wrongful termination, violation of civil rights, and other California state law claims. We object to the naming of each of the defendants in this matter and denies each of the plaintiffs’ claims. The plaintiffs agreed to pre-arbitration mediation, which was conducted on May 4, 2022, as was required by the arbitration agreement executed by each of the plaintiffs. Considering that the parties did not resolve the matter through this mediation, we petitioned the San Diego Superior Court for an order that the matter be submitted to arbitration consistent with each of the plaintiff’s arbitration agreements. The hearing for the motion to compel arbitration was held on August 12, 2022 and the San Diego Superior Court issued a ruling to uphold the binding arbitration agreements signed by both plaintiffs. On July 10, 2023, plaintiff’s counsel filed a formal demand for arbitration for one of the plaintiffs. On August 3, 2023, a joint stipulation was filed dismissing the former Chief Executive Officer, as well as the three

individuals, two of which are currently employed by the Company. The matter is expected to now proceed to arbitration but is the responsibility of the plaintiffs to follow through with the initiation of the arbitration proceeding. We believe that our defense costs, settlement monies, damages or any other awards would be covered by our liability insurance; provided, however, insurance may not cover all claims or could exceed our insurance coverage. We also believe that there are substantial defenses to this lawsuit, and we intend to vigorously defend against each of these claims. While this litigation matter is in the early stages, we believe the action is without merit.

However, because of the uncertain nature of litigation, the outcome of these claims or any other such employment related actions and proceedings cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on our business, financial condition, results of operations, cash flows, reputation, brand identity and the trading price of our securities. Any such litigation, with or without merit, could also result in substantial expenditures of time and money, and divert attention of our management team from other tasks important to the success of our business.

Clinical drug development involves uncertain outcomes, and results of earlier studies and trials may not be predictive of future trial results.

Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials relating to our product candidates may not be predictive of the results of later-stage clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy traits despite having progressed through preclinical studies and initial clinical trials. A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of efficacy or safety profiles, notwithstanding promising results in earlier trials. While we have paused our clinical trials during our exploration of strategic alternatives, we cannot be certain that any of our future clinical trials will be successful and support regulatory approval in any jurisdiction. Failure in one indication may have negative consequences for the development of our product candidates for other indications. Any such failure may harm our business, prospects, and financial condition.

If we decide to further develop our product candidates and development of our product candidates does not produce favorable results, we, and any future collaborators, may be unable to commercialize these products.

To receive regulatory approval for the commercialization of our product candidate emricasan and our other preclinical product candidate, CTS-2090, or any other product candidates that we may develop, adequate and well-controlled clinical trials must be conducted to demonstrate safety and efficacy in humans to the satisfaction of the FDA and comparable foreign regulatory authorities. In order to support marketing approval, these agencies typically require successful results in one or more Phase 3 clinical trials, which our current product candidates have not yet reached and may never reach. In addition to the risks described above under “Clinical drug development involves uncertain outcomes, and results of earlier studies and trials may not be predictive of future trial results,” we may experience numerous unforeseen events during, or as a result of, the development process that could delay or prevent commercialization of our current or future product candidates, including the following:

In the future, we or any future collaborators will be responsible for establishing the targeted endpoints and goals for development of our product candidates. These targeted endpoints and goals may be inadequate to demonstrate the safety and efficacy levels required for regulatory approvals. Even if we believe data collected during the development of our product candidates are promising, such data may not be sufficient to support marketing approval by the FDA or comparable foreign authorities. Further, data generated during development can be interpreted in different ways, and the FDA or comparable foreign authorities may interpret such data in different

ways than us or any future collaborators. Our failure to adequately demonstrate the safety and efficacy of our product candidates would prevent our receipt of regulatory approval, and ultimately the potential commercialization of these product candidates.

In addition, since we do not currently possess the resources necessary to complete development and commercialize our product candidates or any other product candidates that we may develop, we have entered into and may seek to enter into license agreements to assist in the development and potential future commercialization of some or all of our product candidates as a component of our strategic plan. See “Risk Factor – “We expect to depend on collaborations with third parties for the research, development and commercialization of certain of the product candidates we may develop. If any such collaborations are not successful, we may not be able to realize the market potential of those product candidates”.

We may fail to select or capitalize on the most scientifically, clinically or commercially promising or profitable product candidates.

Currently, we have announced our decision to explore strategic alternatives and pause development activities. Should our efforts to pursue a strategic alternative not be successful, we will need to further evaluate our business strategy and, as a result, our Board of Directors may decide that it is in the best interest of our stockholders to dissolve our Company and liquidate our assets or otherwise modify our strategy in the future. In this regard, we may, from time to time, focus our product development efforts on different product candidates or may delay, suspend or terminate the future development of a product candidate at any time for strategic, business, financial or other reasons. For example, in late 2022, we decided to pause development activities on our CCM and our hECM lines of product candidates and focus development efforts elsewhere within the product portfolio while we continue to seek potential strategic partners for such assets. As a result of changes in our strategy, we have and may in the future change or refocus our existing product development, commercialization and manufacturing activities. This could require changes in our facilities and our personnel. Any product development changes that we implement may not be successful. In particular, we may fail to select or capitalize on the most scientifically, clinically or commercially promising or profitable product candidates. Our decisions to allocate our research and development, management and financial resources toward particular product candidates may not lead to the development of viable commercial products and may divert resources from better opportunities. Similarly, our decisions to delay or terminate product development programs may also prove to be incorrect and could cause us to miss valuable opportunities.

Our product candidates may cause undesirable side effects that could delay or prevent their development, regulatory approval or commercialization or have other significant adverse implications on our business, financial condition and results of operations.

While we have currently paused our clinical trials, undesirable side effects observed in our prior or future clinical trials or in supportive preclinical studies with our product candidates could interrupt, delay or halt their development and could result in the denial of regulatory approval by the FDA or comparable foreign authorities for any or all targeted indications or adversely affect the marketability of any such product candidates that receive regulatory approval. In turn, this could eliminate or limit our ability to commercialize our product candidates.

Our product candidates may exhibit adverse effects in preclinical toxicology studies and adverse interactions with other drugs. There are also risks associated with additional requirements the FDA or comparable foreign authorities may impose for marketing approval with regard to a particular disease.

Our product candidates may require a risk management program that could include patient and healthcare provider education, usage guidelines, appropriate promotional activities, a post-marketing observational study, and ongoing safety and reporting mechanisms, among other requirements. Prescribing could be limited to physician specialists or physicians trained in the use of the drug, or could be limited to a more restricted patient population. Any risk management program required for approval of our product candidates could potentially have an adverse effect on our business, financial condition and results of operations.

Undesirable side effects involving our product candidates may have other significant adverse implications on our business, financial condition and results of operations. For example:

We cannot predict whether our product candidates will cause toxicities in humans that would preclude or lead to the revocation of regulatory approval based on nonclinical studies or early-stage clinical trials.

Delays in the commencement or completion of clinical trials could result in increased costs to us and delay our ability to establish strategic license agreements.

Delays in the commencement or completion of any future clinical trials could significantly impact our drug development costs. We do not know whether clinical trials will be reinitiated and begin on time or be completed on schedule, if at all.

The commencement of clinical trials can be delayed for a variety of reasons, including, but not limited to, delays related to:

In addition, once a clinical trial has begun, it may be suspended or terminated by us, our licensees, the institutional review boards or data safety monitoring boards charged with overseeing our clinical trials, the FDA or comparable foreign authorities due to a number of factors, including:

The progress of any clinical trials and clinical studies also may be affected by significant global public health matters such as the current novel coronavirus outbreak. Factors related to the novel coronavirus outbreak that may impact the timing and conduct of our clinical trials and clinical studies include:

In addition, if patients or subjects participating in our clinical trials or studies were to contract COVID-19 or other infectious disease, there could be an adverse impact on the trials or studies. For example, such patients may be unable to participate further or may need to limit participation in a clinical trial or study; the results and data recorded for such patients may differ from those that would have been

recorded if the patients had not been affected by COVID-19 or other infectious disease; or such patients could experience adverse events that could be attributed to the drug product under investigation.

If we experience delays in the completion or termination of any clinical trial of our product candidates, the commercial prospects of our product candidates will be harmed, and our ability to commence product sales and generate product revenues from any of our product candidates will be delayed. In addition, any delays in completing our clinical trials will increase our costs and slow down our product candidate development and approval process. Delays in completing our clinical trials could also allow our competitors to obtain marketing approval before we do or shorten the patent protection period during which we may have the exclusive right to commercialize our product candidates. Any of these occurrences may harm our business, financial condition and prospects significantly. 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.

Results of earlier clinical trials may not be predictive of the results of later-stage clinical trials.

The results of preclinical studies and early clinical trials of product candidates may not be predictive of the results of later-stage clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy results despite having progressed through preclinical studies and initial clinical trials. Many companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to adverse safety profiles or lack of efficacy, notwithstanding promising results in earlier studies. Similarly, our future clinical trial results may not be successful for these or other reasons.

This product candidate development risk is heightened by any changes in the planned clinical trials compared to the completed clinical trials. As product candidates are developed through preclinical and early-stage to late-stage clinical trials towards approval and commercialization, it is customary that various aspects of the development program, such as manufacturing and methods of administration, are altered along the way in an effort to optimize processes and results. While these types of changes are common and are intended to optimize the product candidates for late-stage clinical trials, approval and commercialization, such changes carry the risk that they will not achieve these intended objectives.

Any of these changes could make the results of our planned clinical trials or other future clinical trials we may initiate less predictable and could cause our product candidates to perform differently, including causing toxicities, which could delay completion of our clinical trials, delay approval of our product candidates, and/or jeopardize our ability to commence product sales and generate revenues.

If we experience delays in the enrollment of patients in our clinical trials, our receipt of necessary regulatory approvals could be delayed or prevented.

We may not be able to re-initiate or continue clinical trials for our product candidates if we are unable to locate and enroll a sufficient number of eligible patients to participate in these trials as required by the FDA or other regulatory authorities. Patient enrollment, a significant factor in the timing of clinical trials, is affected by many factors, including the size and nature of the patient population, the proximity of patients to clinical sites, the eligibility criteria for the trial, the design of the clinical trial, competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages of the drug being studied in relation to other available therapies, including any new drugs that may be approved for the indications we are investigating, as well as the impact of the COVID-19 pandemic or any future pandemic.

If we fail to enroll and maintain the number of patients for which any re-initiated clinical trial was designed, the statistical power of that clinical trial may be reduced, which would make it harder to demonstrate that the product candidate being tested in such clinical trial is safe and effective. Additionally, enrollment delays in our clinical trials may result in increased development costs for our product candidates, which would cause our value to decline and limit our ability to obtain additional financing. Our inability to enroll a sufficient number of patients for any of our current or future clinical trials would result in significant delays or may require us to abandon one or more clinical trials altogether.

A pandemic, epidemic or outbreak of an infectious disease, such as COVID-19, or the perception of their effects, may materially and adversely affect our business, operations and financial condition.

Outbreaks of epidemic, pandemic or contagious diseases, such as COVID-19, have and may continue to significantly disrupt our business. Such outbreaks pose the risk that we or our employees, contractors, suppliers, and other partners may be prevented from conducting business activities for an indefinite period of time due to spread of the disease, or due to shutdowns that may be requested or mandated by federal, state and local governmental authorities both within and outside the United States. Business disruptions could include disruptions or restrictions on our ability to travel, as well as temporary closures of our facilities and the facilities of clinical trial sites, service providers, suppliers or contract manufacturers. While it is not possible at this time to estimate the overall impact that the COVID-19 pandemic could have on our business, the continued rapid spread of COVID-19, both across the United States and through

much of the world, and the measures taken by the governments of countries and local authorities has disrupted and could delay advancing our product pipeline, could delay our clinical trials, and could delay our overall development activities. Any of these effects could adversely affect our ability to obtain regulatory approval for and to commercialize our product candidates, increase our operating expenses and have a material adverse effect on our business, prospects and financial condition.

If we were to re-initiate any clinical trial, we would rely on third parties to conduct our preclinical studies and clinical trials and perform other tasks. If these third parties do not successfully carry out their contractual duties, meet expected deadlines, or comply with regulatory requirements, we may not be able to obtain regulatory approval for or commercialize our product candidates and our business, financial condition and results of operations could be substantially harmed.

If we were to re-initiate any clinical trial, we would intend to rely upon third-party CROs, medical institutions, clinical investigators and contract laboratories to monitor and manage data for our ongoing preclinical and clinical programs. Nevertheless, we maintain responsibility for ensuring that each of our clinical trials and preclinical studies is conducted in accordance with the applicable protocol, legal, regulatory, and scientific standards and our reliance on these third parties does not relieve us of our regulatory responsibilities. We and our CROs and other vendors are required to comply with current requirements on good manufacturing practices (“CGMP”), good clinical practices (“GCP”) and good laboratory practice (“GLP”) which are a collection of laws and regulations enforced by the FDA, and comparable foreign authorities for all of our product candidates in clinical development. Regulatory authorities enforce these regulations through periodic inspections of preclinical study and clinical trial sponsors, principal investigators, preclinical study and clinical trial sites, and other contractors. If we or any of our CROs or vendors fails to comply with applicable regulations, the data generated in our preclinical studies and clinical trials may be deemed unreliable and the FDA, or comparable foreign authorities may require us to perform additional preclinical studies and clinical trials before approving our marketing applications. We cannot assure you that upon inspection by a given regulatory authority, such regulatory authority will determine that any of our clinical trials comply with GCP regulations. In addition, our clinical trials must be conducted with products produced consistent with CGMP regulations. Our failure to comply with these regulations may require us to repeat clinical trials, which would delay the development and regulatory approval processes.

We may not be able to enter into arrangements with CROs on commercially reasonable terms, or at all. In addition, our CROs will not be our employees, and except for remedies available to us under our agreements with such CROs, we will not be able to control whether or not they devote sufficient time and resources to our ongoing preclinical and clinical programs. If CROs 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 data, they obtain is compromised due to the failure to adhere to our protocols, regulatory requirements, or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to obtain regulatory approval for or successfully commercialize our product candidates. CROs may also generate higher costs than anticipated. As a result, our business, financial condition and results of operations and the commercial prospects for our product candidates could be materially and adversely affected, our costs could increase, and our ability to generate revenue could be delayed.

Switching or adding additional CROs, medical institutions, clinical investigators or contract laboratories involves additional cost and requires management time and focus. In addition, there is a natural transition period when a new CRO commences work replacing a previous CRO. As a result, delays occur, which can materially impact our ability to meet our desired clinical development timelines. There can be no assurance that we will not encounter similar challenges or delays in the future or that these delays or challenges will not have a material adverse effect on our business, financial condition or results of operations.

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

We may experience delays in commencing and completing clinical trials of our product candidates in the event that we decide and are able to further develop or product candidates. We do not know whether any planned clinical trials will begin on time, need to be redesigned, enroll patients on time or be completed on schedule, if at all. Any of our future clinical trials may be delayed for a variety of reasons, including delays related to:

Patient enrollment, a significant factor in the timing of clinical trials, is affected by many factors including the size and nature of the patient population, the proximity of patients to clinical sites, the eligibility criteria for the clinical trial, the design of the clinical trial, competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages of the product candidate being studied in relation to other available therapies, including any new drugs that may be approved for the indications we are investigating. In addition, significant numbers of patients who enroll in our clinical trials may drop out during the clinical trials for various reasons. We believe it appropriately accounts for such increased risk of dropout rates in our trials when determining expected clinical trial timelines, but we cannot assure you that our assumptions are correct, or that it will not experience higher numbers of dropouts than anticipated, which would result in the delay of completion of such trials beyond our expected timelines.

We could encounter 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 and efficacy profiles. Further, a clinical trial may be suspended or terminated by us, the IRBs in the institutions in which such trials are being conducted, the data monitoring committee for such trial, or by the FDA or other regulatory authorities due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a product candidate, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial. If we experience termination of, or delays in the completion of, any clinical trial of our product candidates, the commercial prospects for such product candidate will be harmed, and our ability to generate product revenues will be delayed. In addition, any delays in completing our clinical trials will increase our costs, slow down our product development and approval process and jeopardize our ability to commence product sales and generate revenues. Any of these occurrences may harm our business, prospects, financial condition and results of operations significantly. Furthermore, 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 a product candidate.

We cannot assure you that any future clinical trial for our product candidates will be started or completed on schedule, or at all. Any failure or significant delay in completing clinical trials for our product candidates would harm the commercial prospects for such product candidate and adversely affect our financial results. Difficulties and failures can occur at any stage of clinical development, and we cannot assure you that it will be able to successfully complete the development and commercialization of any product candidate in any indication.

Changes in funding for the FDA and other government agencies could hinder their ability to hire and retain key leadership and other personnel, or otherwise prevent new products and services from being developed or commercialized in a timely manner, 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 (i) government budget and funding levels, (ii) the ability to hire and retain key personnel and accept the payment of user fees and (iii) statutory, regulatory and policy changes. Average review times at the agency have fluctuated in recent years as a result. In addition, government funding of other government agencies 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 to be reviewed and/or approved by necessary government agencies, which would adversely affect its business. For example, over the last several years, including for 35 days beginning on December 22, 2018, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have had to furlough critical FDA employees and stop critical activities. 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.

We are subject to a multitude of manufacturing risks, any of which could substantially increase our costs and limit supply of our product candidates.

The process of manufacturing our product candidates is complex, highly regulated, and subject to several risks. For example, the process of manufacturing our product candidates is extremely susceptible to product loss due to contamination, equipment failure or improper installation or operation of equipment, or vendor or operator error. Even minor deviations from normal manufacturing processes for any of our product candidates 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. In addition, the manufacturing facilities in which our product candidates are made could be adversely affected by equipment failures, labor shortages, natural disasters, public health crises, pandemics and epidemics, such as the ongoing COVID-19 pandemic, power failures and numerous other factors.

In addition, any adverse developments affecting manufacturing operations for our product candidates may result in shipment delays, inventory shortages, lot failures, withdrawals or recalls, or other interruptions in the supply of our product candidates. We also may need to take inventory write-offs and incur other charges and expenses for product candidates that fail to meet specifications, undertake costly remediation efforts, or seek costlier manufacturing alternatives.

If we were to re-initiate any clinical trial, our intentions would be to rely primarily on third parties to manufacture our preclinical and clinical drug supplies, and our business, financial condition and results of operations could be harmed if those third parties fail to provide us with sufficient quantities of drug product or fail to do so at acceptable quality levels or prices.

If we were to re-initiate any clinical trials, our intentions would be to rely completely on third parties for such manufacturing. We lack the resources and the capability to manufacture any of our product candidates on a late-stage clinical or commercial scale. We will rely on our manufacturers to purchase from third-party suppliers the materials necessary to produce our product candidates for our clinical trials. There are a limited number of suppliers for raw materials that we use to manufacture our product candidates, and there may be a need to identify alternate suppliers to prevent a possible disruption of the manufacture of the materials necessary to produce our product candidates for our clinical trials, and, if approved, ultimately for commercial sale. We do not have any control over the process or timing of the acquisition of these raw materials by our manufacturers. Although we generally do not begin a clinical trial unless we believe we have a sufficient supply of a product candidate to complete such clinical trial, any significant delay or discontinuity in the supply of a product candidate, or the raw material components thereof, for an ongoing clinical trial due to the need to replace a third-party

manufacturer could considerably delay completion of our clinical trials, product testing and potential regulatory approval of our product candidates, which could harm our business, financial condition and results of operations.

We and our contract manufacturers are subject to significant regulation with respect to manufacturing our product candidates. The manufacturing facilities on which we rely may not continue to meet regulatory requirements.

All entities involved in the preparation of therapeutics for clinical trials or commercial sale, including our contract manufacturers for our product candidates, are subject to extensive regulation. Components of a finished therapeutic product approved for commercial sale or used in late-stage clinical trials must be manufactured in accordance with CGMP. These regulations govern manufacturing processes and procedures and the implementation and operation of quality systems to control and assure the quality of investigational products and products approved for sale. Poor control of production processes can lead to the introduction of contaminants or to inadvertent changes in the properties or stability of our product candidates that may not be detectable in final product testing. We or our contract manufacturers must supply all necessary documentation in support of an NDA on a timely basis and must adhere to GLP and CGMP regulations enforced by the FDA or comparable foreign authorities through their facilities inspection program. Some of our contract manufacturers may not have produced a commercially approved pharmaceutical product and therefore may not have obtained the requisite regulatory authority approvals to do so. The facilities and quality systems of some or all of our third-party contractors must pass a pre-approval inspection for compliance with the applicable regulations as a condition of regulatory approval of our product candidates or any of our other potential products. In addition, the regulatory authorities may, at any time, audit or inspect a manufacturing facility involved with the preparation of our product candidates or any of our other potential products or the associated quality systems for compliance with the regulations applicable to the activities being conducted. Although we plan to oversee the contract manufacturers, we cannot control the manufacturing process of, and are completely dependent on, our contract manufacturing partners for compliance with the regulatory requirements. If these facilities do not pass a pre-approval plant inspection, regulatory approval of the products may not be granted or may be substantially delayed until any violations are corrected to the satisfaction of the regulatory authority, if ever.

The regulatory authorities also may, at any time following approval of a product for sale, audit the manufacturing facilities of our third-party contractors. If any such inspection or audit identifies a failure to comply with applicable regulations or if a violation of our product specifications or applicable regulations occurs independent of such an inspection or audit, we or the relevant regulatory authority may require remedial measures that may be costly or time consuming for us or a third party to implement, and that may include the temporary or permanent suspension of a clinical trial or commercial sales or the temporary or permanent closure of a facility. Any such remedial measures imposed upon us or third parties with whom we contract could materially harm our business, financial condition and results of operations.

If we or any of our third-party manufacturers fail to maintain regulatory compliance, the FDA or comparable foreign authorities can impose regulatory sanctions including, among other things, refusal to approve a pending application for a product candidate, withdrawal of an approval, or suspension of production. As a result, our business, financial condition and results of operations may be materially and adversely affected.

Additionally, if supply from one manufacturer is interrupted, an alternative manufacturer would need to be qualified through an NDA supplement, or equivalent foreign regulatory filing, which could result in further delay. The regulatory agencies may also require additional studies or trials if a new manufacturer is relied upon for commercial production. Switching manufacturers may involve substantial costs and is likely to result in a delay in our desired clinical and commercial timelines.

These factors could cause us to incur higher costs and could cause the delay or termination of clinical trials, regulatory submissions, required approvals, or commercialization of our product candidates. Furthermore, if our suppliers fail to meet contractual requirements and we are unable to secure one or more replacement suppliers capable of production at a substantially equivalent cost, our clinical trials may be delayed, or we could lose potential revenue.

Any license agreement that we may enter into in the future may not be successful, which could adversely affect our ability to develop and commercialize our current and potential future product candidates.

We may seek license agreements with biopharmaceutical companies for the development or commercialization of our current and potential future product candidates. To the extent that we decide to enter into license agreements, we will face significant competition in seeking appropriate licensees. Moreover, license agreements are complex and time consuming to negotiate, execute and implement. We may not be successful in our efforts to establish and implement license agreements or other alternative arrangements should we choose to enter into such arrangements, and the terms of the arrangements may not be favorable to us. If and when we enter into additional license agreements with a third party for development and commercialization of a product candidate, we can expect to relinquish some or all of the control over the future success of that product candidate to the third party. The success of our license agreements will depend heavily on the efforts and activities of our licensees. Licensees generally have significant discretion in determining the efforts and resources that they will apply to the product candidate.

Disagreements between parties to a license arrangement can lead to delays in developing or commercializing the applicable product candidate and can be difficult to resolve in a mutually beneficial manner. In some cases, licenses with biopharmaceutical companies and other third parties are terminated or allowed to expire by the other party. Any such termination or expiration would adversely affect our business, financial condition and results of operations.

If we face allegations of noncompliance with the law and encounter sanctions, our reputation, revenues and liquidity may suffer, and any of our product candidates that are ultimately approved for commercialization could be subject to restrictions or withdrawal from the market.

Any government investigation of alleged violations of law could require us to expend significant time and resources in response and could generate negative publicity. Any failure to comply with ongoing regulatory requirements may significantly and adversely affect our ability to generate revenues from any of our product candidates that are ultimately approved for commercialization. If regulatory sanctions are applied or if regulatory approval is withdrawn, our business, financial condition and results of operations will be adversely affected. Additionally, if we are unable to generate revenues from product sales, our potential for achieving profitability will be diminished and our need to raise capital to fund our operations will increase.

We are exposed to product liability, non-clinical and clinical liability risks, which could place a substantial financial burden upon us, should lawsuits be filed against us.

Our business exposes us to potential product liability and other liability risks that are inherent in the testing, manufacturing and marketing of pharmaceutical formulations and products. In addition, the use in our clinical trials of pharmaceutical products and the subsequent sale of these products by us or our potential licensees may cause us to bear a portion of or all product liability risks. A successful liability claim or series of claims brought against us could have a material adverse effect on our business, financial condition and results of operations.

Our research and development activities involve the use of hazardous materials, which subject us to regulation, related costs and delays and potential liabilities.

Our research and development activities involve the controlled use of hazardous materials, chemicals and various radioactive compounds. If an accident occurs, we could be held liable for resulting damages, which could be substantial. We are also subject to numerous environmental, health and workplace safety laws and regulations, including those governing laboratory procedures, exposure to blood-borne pathogens and the handling of biohazardous materials. Additional federal, state and local laws and regulations affecting our operations may be adopted in the future. We may incur substantial costs to comply with, and substantial fines or penalties if we violate any of these laws or regulations.

We rely significantly on information technology and any failure, inadequacy, interruption or security lapse of that technology, including any cybersecurity incidents, could harm our ability to operate our business effectively.

Despite the implementation of security measures, our internal computer systems and those of third parties with which we contract are vulnerable to damage from cyber-attacks, computer viruses, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. System failures, accidents or security breaches could cause interruptions in our operations and could result in a material disruption of our drug development and clinical activities and business operations, in addition to possibly requiring substantial expenditures of resources to remedy. The loss of drug development or clinical trial data 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 our development programs and the development of our product candidates could be delayed.

Our employees and consultants may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements.

We are exposed to the risk of employee or consultant fraud or other misconduct. Misconduct by our employees or consultants could include intentional failures to comply with FDA regulations, provide accurate information to the FDA, comply with manufacturing standards, comply with federal and state healthcare fraud and abuse laws and regulations, report financial information or data accurately or disclose unauthorized activities to us. In particular, sales, marketing and business arrangements in the healthcare industry are subject to extensive laws and regulations intended 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, sales commissions, customer incentive programs and other business arrangements. Employee and consultant misconduct also could involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation. It is not always possible to identify and deter such misconduct, 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 be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending itself or asserting our rights, those actions could have a material adverse effect on our business, financial condition and results of operations, and result in the imposition of significant fines or other sanctions against us.

Business disruptions such as natural disasters could seriously harm our future revenues and financial condition and increase our costs and expenses.

We and our suppliers may experience a disruption in their business as a result of natural disasters. A significant natural disaster, such as an earthquake, hurricane, flood or fire, could severely damage or destroy our headquarters or facilities or the facilities of our manufacturers or suppliers, which could have a material and adverse effect on our business, financial condition and results of operations. In addition, terrorist acts or acts of war targeted at the U.S., could cause damage or disruption to us, our employees, facilities, partners and suppliers, which could have a material adverse effect on our business, financial condition and results of operations.

Our cash and cash equivalents could be adversely affected if the financial institutions in which we hold our cash and cash equivalents fail.

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, the Federal Deposit Insurance Corporation (the “FDIC”) took control of Silicon Valley Bank (“SVB”) and created the National Bank of Santa Clara to hold the deposits of SVB after SVB was unable to continue its operations. On March 12, 2023, the FDIC, U.S. Department of the Treasury, and Board of Governors of the Federal Reserve System, issued a joint press release stating that all depositors would have access to all of their money beginning on March 13, 2023.

If we are unable to access all or a significant portion of the amounts we have deposited at financial institutions for any extended period of time, we may not be able to pay our operational expenses or make other payments until we are able to move our funds to accounts at one or more other financial institutions, which process could cause a temporary delay in making payments to our vendors and employees and cause other operational challenges.

We may not be successful in obtaining or maintaining necessary rights to our product candidates through acquisitions and in-licenses.

One or more of our programs may require the use of proprietary rights held by third parties. We may need to acquire or in-license additional intellectual property in the future with respect to other product candidates. Moreover, we may be unable to acquire or in-license any compositions, methods of use, processes, or other intellectual property rights from third parties that we identify as necessary for our product candidates. We face competition with regard to acquiring and in-licensing third-party intellectual property rights, including from a number of more established companies. These established companies may have a competitive advantage over us due to their size, cash resources and greater clinical development and commercialization capabilities. In addition, companies that perceive us to be a competitor may be unwilling to assign or license intellectual property rights to us. We also may be unable to acquire or in-license third-party intellectual property rights on terms that would allow us to make an appropriate return on our investment.

We may enter into license agreements with U.S. and foreign academic institutions to accelerate development of our current or future preclinical product candidates. Typically, these agreements include an option for the company to negotiate a license to the institution’s resulting intellectual property rights. Even with such an 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 license rights from the institution, the institution may offer the intellectual property rights to other parties, potentially blocking our ability to pursue our desired program.

If we are unable to successfully obtain required third-party intellectual property rights or maintain our existing intellectual property rights, we may need to abandon development of the related program and our business, financial condition and results of operations could be materially and adversely affected.

We may not be able to protect our proprietary or licensed technology in the marketplace.

We depend on our ability to protect our proprietary or licensed technology. We rely on trade secret, patent, copyright and trademark laws, and confidentiality, licensing, and other agreements with employees and third parties, all of which offer only limited protection. Our success depends in large part on our ability and any licensor’s or licensee’s ability to obtain and maintain patent protection in the

U.S. and other countries with respect to our proprietary or licensed technology and products. We currently in-license some of our intellectual property rights to develop our product candidates and may in-license additional intellectual property rights in the future. We cannot be certain that patent enforcement activities by our current or future licensors have been or will be conducted in compliance with applicable laws and regulations or will result in valid and enforceable patents or other intellectual property rights. We also cannot be certain that our current or future licensors will allocate sufficient resources or prioritize their or our enforcement of such patents. Even if we are not a party to these legal actions, an adverse outcome could prevent us from continuing to license intellectual property that we may need to operate our business, which would have a material adverse effect on our business, financial condition, and results of operations.

We believe we will be able to obtain, through prosecution of patent applications covering our owned technology and technology licensed from others, adequate patent protection for our proprietary drug technology, including those related to our in-licensed intellectual property. If we are compelled to spend significant time and money protecting or enforcing our licensed patents and future patents we may own, designing around patents held by others or licensing or acquiring, potentially for large fees, patents or other proprietary rights held by others, our business, financial condition and results of operations may be materially and adversely affected. If we are unable to effectively protect the intellectual property that we own or in-license, other companies may be able to offer the same or similar products for sale, which could materially adversely affect our business, financial condition and results of operations.

The patents of others from whom we may license technology, and any future patents we may own, may be challenged, narrowed, invalidated or circumvented, which could limit our ability to stop competitors from marketing the same or similar products or limit the length of term of patent protection that we may have for our products.

Obtaining and maintaining patent protection depends on compliance with various procedural, document submission, fee payment and other requirements imposed by governmental patent agencies, and our patent protection for licensed patents, pending patent applications and potential future patent applications and patents could be reduced or eliminated for non-compliance with these requirements.

Periodic maintenance fees, renewal fees, annuity fees and various other governmental fees on patents and/or patent applications will be due to be paid to the U.S. Patent and Trademark Office (“USPTO”) and various governmental patent agencies outside of the U.S. in several stages over the lifetime of the applicable patent and/or patent application. The USPTO and various non-U.S. governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent application process. In many cases, an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules. However, there are situations in which noncompliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. If this occurs with respect to our in-licensed patents or patent applications we may file in the future, our competitors might be able to use our technologies, which would have a material adverse effect on our business, financial condition, and results of operations.

The patent positions of pharmaceutical products are often complex and uncertain. The breadth of claims allowed in pharmaceutical patents in the U.S. and many jurisdictions outside of the U.S. is not consistent. For example, in many jurisdictions, the support standards for pharmaceutical patents are becoming increasingly strict. Some countries prohibit method of treatment claims in patents. Changes in either the patent laws or interpretations of patent laws in the U.S. and other countries may diminish the value of our licensed or owned intellectual property or create uncertainty. In addition, publication of information related to our current product candidates and potential products may prevent us from obtaining or enforcing patents relating to these product candidates and potential products, including without limitation composition-of-matter patents, which are generally believed to offer the strongest patent protection.

Patents that we currently license and patents that we may own or license in the future do not necessarily ensure the protection of our licensed or owned intellectual property for a number of reasons, including, without limitation, the following:

Our competitors may be able to circumvent our licensed patents or future patents we may own by developing similar or alternative technologies or products in a non-infringing manner. Our competitors may seek to market generic versions of any approved products by submitting abbreviated new drug applications to the FDA in which our competitors claim that our licensed patents or any future patents we may own are invalid, unenforceable, or not infringed. Alternatively, our competitors may seek approval to market their own products similar to or otherwise competitive with our products. In these circumstances, we may need to defend or assert our licensed patents or any future patents we may own, including by filing lawsuits alleging patent infringement. In any of these types of proceedings, a court or other agency with jurisdiction may find our licensed patents or any future patents we may own invalid or unenforceable. We may also fail to identify patentable aspects of our research and development before it is too late to obtain patent protection. Even if we own or in-license valid and enforceable patents, these patents still may not provide protection against competing products or processes sufficient to achieve our business objectives.

The issuance of a patent is not conclusive as to our inventorship, scope, ownership, priority, validity, or enforceability. In this regard, third parties may challenge our licensed patents or any future patents we may own in the courts or patent offices in the U.S. and abroad. Such challenges may result in loss of exclusivity or freedom to operate or in patent claims being narrowed, invalidated, or held unenforceable, in whole or in part, which could limit our ability to stop others from using or commercializing similar or identical technology and products or limit the duration of the patent protection of our technology and potential products. In addition, given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such product candidates might expire before or shortly after such product candidates are commercialized.

We may infringe the intellectual property rights of others, which may impact our ability to complete a strategic transaction or otherwise prevent or delay any future drug development efforts and prevent us from commercializing or increase the costs of commercializing our products, if approved.

Our ability to pursue strategic alternatives, or, alternatively, our commercial success depends significantly on our ability to operate without infringing the patents and other intellectual property rights of third parties. For example, there could be issued patents of which we are not aware that our current or potential future product candidates infringe. There also could be patents that we believe we do not infringe, but that we may ultimately be found to infringe.

Moreover, patent applications are in some cases maintained in secrecy until patents are issued. The publication of discoveries in the scientific or patent literature frequently occurs substantially later than the date on which the underlying discoveries were made and patent applications were filed. Because patents can take many years to issue, there may be currently pending applications of which we are unaware that may later result in issued patents that our product candidates or potential products infringe. For example, pending applications may exist that claim or can be amended to claim subject matter that our product candidates or potential products infringe. Competitors may file continuing patent applications claiming priority to already issued patents in the form of continuation, divisional, or continuation-in-part applications, in order to maintain the pendency of a patent family and attempt to cover our product candidates.

Third parties may assert that we are employing their proprietary technology without authorization and may sue us for patent or other intellectual property infringement. These lawsuits are costly and could adversely affect our business, financial condition and results of operations and divert the attention of managerial and scientific personnel. If we are sued for patent infringement, we would need to demonstrate that our product candidates, potential products, or methods either do not infringe the claims of the relevant patent or that the patent claims are invalid, and we may not be able to do this. Proving invalidity is difficult. For example, in the U.S., proving invalidity requires a showing of clear and convincing evidence to overcome the presumption of validity enjoyed by issued patents. Even if we are successful in these proceedings, we may incur substantial costs and the time and attention of our management and scientific personnel could be diverted in pursuing these proceedings, which could have a material adverse effect on us. In addition, we may not have sufficient

resources to bring these actions to a successful conclusion. If a court holds that any third-party patents are valid, enforceable and cover our products or their use, the holders of any of these patents may be able to block our ability to commercialize our products unless we acquire or obtains a license under the applicable patents or until the patents expire.

We may not be able to enter into licensing arrangements or make other arrangements at a reasonable cost or on reasonable terms. Any inability to secure licenses or alternative technology could result in delays in the introduction of our products or lead to prohibition of the manufacture or sale of products by us. Even if we are able to obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. We could be forced, including by court order, to cease commercializing the infringing technology or product. In addition, in any such proceeding or litigation, we could be found liable for monetary damages, including treble damages and attorneys’ fees, if we are found to have willfully infringed a patent. A finding of infringement could prevent us from commercializing our product candidates or force us to cease some of our business operations, which could materially and adversely affect our business, financial condition, and results of operations. Any claims by third parties that we have misappropriated their confidential information or trade secrets could have a similar material and adverse effect on our business, financial condition, and results of operations. In addition, any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to enter into a strategic transaction or raise the funds necessary to continue our operations.

Any claims or lawsuits relating to infringement of intellectual property rights brought by or against us will be costly and time consuming and may adversely affect our ability to enter into a strategic transaction or otherwise adversely impact our business, financial condition, and results of operations.

We may be required to initiate litigation to enforce or defend our licensed and owned intellectual property. Lawsuits to protect our intellectual property rights can be very time consuming and costly. There is a substantial amount of litigation involving patent and other intellectual property rights in the biopharmaceutical industry generally. Such litigation or proceedings could substantially increase our operating expenses and reduce the resources available for development activities or any future sales, marketing, or distribution activities.

In any infringement litigation, any award of monetary damages we receive may not be commercially valuable. 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 litigation. Moreover, there can be no assurance that we will have sufficient financial or other resources to file and pursue such infringement claims, which typically last for years before they are resolved. Further, any claims we assert against a perceived infringer could provoke these parties to assert counterclaims against us alleging that we have infringed their patents. Some of our competitors may be able to sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could have a material adverse effect on our ability to develop our product candidates.

In addition, our licensed patents and patent applications, and patents and patent applications that we may apply for, own or license in the future, could face other challenges, such as interference proceedings, opposition proceedings, re-examination proceedings and other forms of post-grant review. Any of these challenges, if successful, could result in the invalidation of, or in a narrowing of the scope of, any of our licensed patents and patent applications and patents and patent applications that we may apply for, own or license in the future. Any of these challenges, regardless of their success, would likely be time consuming and expensive to defend and resolve and would divert our management and scientific personnel’s time and attention.

Changes in U.S. patent law could diminish the value of patents in general, thereby impairing our ability to protect our products.

As is the case with other biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the biopharmaceutical industry involves both technological and legal complexity and is costly, time-consuming, and inherently uncertain. For example, the U.S. previously enacted and is currently implementing wide-ranging patent reform legislation. Specifically, on September 16, 2011, the Leahy-Smith America Invents Act (the “Leahy-Smith Act”) was signed into law and included a number of significant changes to U.S. patent law, and many of the provisions became effective in March 2013. However, it may take the courts years to interpret the provisions of the Leahy-Smith Act, and the implementation of the statute could increase the uncertainties and costs surrounding the prosecution of our licensed and future patent applications and the enforcement or defense of our licensed and future patents, all of which could have a material adverse effect on our business, financial condition, and results of operations.

In addition, the U.S. Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available in certain circumstances or weakening 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 patents that we might obtain in the future.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting and defending patents on product candidates throughout the world would be prohibitively expensive. Competitors may use our licensed and owned technologies in jurisdictions where we have not licensed or obtained patent protection to develop their own products and, further, may export otherwise infringing products to territories where we may obtain or license patent protection, but where patent enforcement is not as strong as that in the U.S. These products may compete with our products in jurisdictions where we do not have any issued or licensed patents and any future patent claims or other intellectual property rights may not be effective or sufficient to prevent them from so competing.

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 and other intellectual property protection, particularly those relating to biopharmaceuticals, which could make it difficult for us to stop the infringement of our licensed patents and future patents we may own, or marketing of competing products in violation of our proprietary rights generally. Further, the laws of some foreign countries do not protect proprietary rights to the same extent or in the same manner as the laws of the U.S. As a result, we may encounter significant problems in protecting and defending our licensed and owned intellectual property both in the U.S. and abroad. For example, China currently affords less protection to a company’s intellectual property than some other jurisdictions. As such, the lack of strong patent and other intellectual property protection in China may significantly increase our vulnerability regarding unauthorized disclosure or use of our intellectual property and undermine our competitive position. Proceedings to enforce our future patent rights, if any, in foreign jurisdictions could result in substantial cost and divert our efforts and attention from finding a strategic transaction or other aspects of our business.

We may be unable to adequately prevent disclosure of trade secrets and other proprietary information.

In order to protect our proprietary and licensed technology and processes, we rely in part on confidentiality agreements with our corporate partners, employees, consultants, manufacturers, outside scientific advisors and sponsored researchers and other advisors. These agreements may not effectively prevent disclosure of our confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover our trade secrets and proprietary information. Failure to obtain or maintain trade secret protection could adversely affect our search for a strategic alternative and our competitive business position.

We may be subject to claims that our employees, consultants, or independent contractors have wrongfully used or disclosed confidential information of third parties.

We employ individuals who were previously employed at other biopharmaceutical companies. Although we have no knowledge of any such claims against us, 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 our employees’ former employers or other third parties. Litigation may be necessary to defend against these claims. There is no guarantee of success in defending these claims, and even if we are successful, litigation could result in substantial cost and be a distraction to our management and other employees. To date, none of our employees have been subject to such claims.

We may be subject to claims challenging the inventorship of our licensed patents, any future patents we may own and other intellectual property.

Although we are not currently experiencing any claims challenging the inventorship of our licensed patents or our licensed or owned intellectual property, we may in the future be subject to claims that former employees, licensees or other third parties have an interest in our licensed patents or other licensed or owned intellectual property as an inventor or co-inventor. For example, we may have inventorship disputes arise from conflicting obligations of consultants or others who are involved in developing our product candidates. Litigation may be necessary to defend against these and other claims challenging inventorship. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights, such as exclusive ownership of, or right to use, valuable intellectual property. Such an outcome could have a material adverse effect on our business, financial condition, and results of operations. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to management and other employees.

If we do not obtain additional protection under the Hatch-Waxman Amendments and similar foreign legislation extending the terms of our licensed patents and any future patents we may own, our business, financial condition and results of operations and our ability to pursue a strategic transaction may be materially and adversely affected.

Depending upon the timing, duration, and specifics of FDA regulatory approval for our product candidates, one or more of our licensed U.S. patents or future U.S. patents that we may license or own may be eligible for limited patent term restoration under the Drug Price

Competition and Patent Term Restoration Act of 1984, referred to as the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years as compensation for patent term lost during drug development and the FDA regulatory review process. This period is generally one-half the time between the effective date of an investigational new drug application (“IND”) (falling after issuance of the patent), and the submission date of an NDA, plus the time between the submission date of an NDA and the approval of that application. Patent term restorations, however, cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval by the FDA.

The application for patent term extension is subject to approval by the USPTO, in conjunction with the FDA. It takes at least six months to obtain approval of the application for patent term extension. We may not be granted an extension because of, for example, failing to apply 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 our requests. If we are unable to obtain patent term extension or restoration or the term of any such extension is less than our requests, the period during which we will have the right to exclusively market our product will be shortened and our competitors may obtain earlier approval of competing products, and our ability to generate revenues could be materially adversely affected.

The market price of our common stock has been and may continue to be volatile. Our stock price could be subject to wide fluctuations in response to a variety of factors, including the following:

In addition, the stock market, in general, and small 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 stock, regardless of our actual operating performance. Further, a decline in the financial markets and related factors beyond our control may cause our stock price to decline rapidly and unexpectedly.

If we were to be delisted from Nasdaq and begin to be quoted on the OTC market, the quotation of our common stock on the OTC market does not assure that a meaningful, consistent and liquid trading market currently exists, and in recent years such market has experienced extreme price and volume fluctuations that have particularly affected the market prices of many smaller companies like us. Our common stock would be subject to this volatility. Sales of substantial amounts of common stock, or the perception that such sales might occur, could adversely affect prevailing market prices of our common stock and our stock price may decline substantially in a short time and our stockholders could suffer losses or be unable to liquidate their holdings.

Entering into a strategic transaction or otherwise raising additional capital may cause dilution to our existing stockholders, restrict our operations, or require us to relinquish rights to our technologies or product candidate.

We are exploring strategic alternatives, including the potential issuance of our equity as part of any such transaction. If a strategic transaction is not completed, we may seek additional capital through a combination of public and private equity offerings, debt financings, strategic partnerships and alliances and licensing arrangements. To the extent that we issue equity as part of a strategic transaction or raise additional capital through the sale of equity or convertible debt securities, the ownership interests of our stockholders will be diluted, and the terms may include liquidation or other preferences that adversely affect the rights of our stockholders. The incurrence of indebtedness would result in increased fixed payment obligations and could involve certain restrictive covenants, such as limitations on our ability to incur additional debt, limitations on our ability to acquire or license intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. If we raise additional funds through strategic partnerships and alliances and licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies or product candidate, or grant licenses on terms unfavorable to us.

Our board of directors has in the past issued and may in the future issue one or more series of preferred stock without stockholder approval with the effect of diluting existing stockholders and impairing their voting and other rights.

Our amended and restated certificate of incorporation authorizes the issuance of up to 10,000,000 shares of “blank check” preferred stock, with designations, rights and preferences as may be determined from time to time by our board of directors without stockholder approval. In March 2022, we entered into a securities purchase agreement with certain investors, pursuant to which we issued and sold 2,500 shares of our newly designated Series A Convertible Redeemable Preferred Stock and 2,500 shares of our newly designated Series B Convertible Redeemable Preferred Stock (collectively the Preferred Stock) in a private placement transaction. In June 2022, all shares of Preferred Stock were redeemed and no shares of Preferred Stock are currently outstanding. If our board of directors without stockholder approval, issues one or more additional series of preferred stock with dividend, liquidation, conversion, supermajority voting, redemption or other rights, it could dilute the interest of, or impair the voting power of, our common stockholders.

Anti-takeover provisions in our charter documents and under Delaware law could make an acquisition of us more difficult and may prevent attempts by our stockholders to replace or remove our management.

Provisions in our certificate of incorporation and bylaws may delay or prevent an acquisition or a change in management. These provisions include a classified board of directors, a prohibition on actions by written consent of our stockholders and the ability of the board of directors to issue preferred stock without stockholder approval. In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law (“DGCL”), which prohibits stockholders owning in excess of 15% of our outstanding voting stock from merging or combining with us. Although we believe these provisions collectively will provide for an opportunity to receive higher bids by requiring potential acquirers to negotiate with our board of directors, they would apply even if the offer may be considered beneficial by some stockholders. In addition, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove then current management by making it more difficult for stockholders to replace members of the board of directors, which is responsible for appointing the members of management.

Our failure to meet the continued listing requirements of the Nasdaq could result in a delisting of our common stock.

Nasdaq, Nasdaq may take steps to delist our common stock. Such a delisting would likely have a negative effect on the price of our common stock and would impair your ability to sell or purchase our common stock when you wish to do so.

On June 5, 2023, we received a letter from the Listing Qualifications Department of the Nasdaq Stock Market (“Nasdaq”) indicating that, based upon the closing bid price of our common stock for the 30 consecutive business day period between April 21, 2023, through June 2, 2023, we did not meet the minimum bid price of $1.00 per share required for continued listing on The Nasdaq Capital Market pursuant to Nasdaq Listing Rule 5550(a)(2). The letter also indicated that we will be provided with a compliance period of 180 calendar days, or until December 4, 2023 (the “Compliance Period”), in which to regain compliance pursuant to Nasdaq Listing Rule 5810(c)(3)(A).

If we fail to regain compliance with the minimum bid price requirement our stock may be delisted, which would have a severe impact on our ability to complete a strategic transaction. Furthermore, in the event of a delisting, we can provide no assurance that any action taken by us to restore compliance with listing requirements would allow our common stock to become listed again, stabilize the market price or improve the liquidity of our common stock, prevent our common stock from dropping below the Nasdaq minimum bid price requirement or prevent future non-compliance with Nasdaq’s listing requirements. Furthermore, if our common stock is delisted, it is unlikely that we will be able to list our common stock on another national securities exchange and, as a result, we expect our securities would be quoted on an over-the-counter market. Delisting from the Nasdaq Capital Market or any Nasdaq market could make trading our common stock more difficult for investors, potentially leading to declines in our share price and liquidity. Without a Nasdaq market listing, stockholders may have a difficult time getting a quote for the sale or purchase of our stock, the sale or purchase of our stock would likely be made more difficult and the trading volume and liquidity of our stock could decline. Delisting from Nasdaq could also result in negative publicity and could also make it more difficult for us to raise additional capital. The absence of such a listing may adversely affect the acceptance of our common stock as currency or the value accorded by other parties. Further, if we are delisted, we would also incur additional costs under state blue sky laws in connection with any sales of our securities. These requirements could severely limit the market liquidity of our common stock and the ability of our stockholders to sell our common stock in the secondary market.

Sales of a substantial number of shares of our common stock by our stockholders in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market or the perception that these sales might occur could significantly reduce the market price of our common stock and impair our ability to raise adequate capital through the sale of additional equity securities. We are unable to predict the effect that such sales may have on the prevailing market price of our common stock. As of June 30, 2023, we have outstanding warrants to purchase an aggregate of approximately 4.9 million shares of our common stock, and options to purchase an aggregate of approximately 613 thousand shares of our common stock, which, if exercised, may further increase the number of shares of our common stock outstanding and the number of shares eligible for resale in the public market.

Our internal control over financial reporting may not meet the standards required by Section 404 of the Sarbanes-Oxley Act, and failure to achieve and maintain effective internal control over financial reporting in accordance with Section 404 of the Sarbanes-Oxley Act, could have a material adverse effect on our business and share price.

Our management is required to report on the effectiveness of our internal control over financial reporting. The rules governing the standards that must be met for our management to assess our internal control over financial reporting are complex and require significant documentation, testing and possible remediation.

We cannot assure you that there will not be material weaknesses or significant deficiencies in our internal control over financial reporting in the future. Any failure to maintain internal control over financial reporting could severely inhibit our ability to accurately report our financial condition, results of operations or cash flows. If we are unable to conclude that our internal control over financial reporting is effective, or if our independent registered public accounting firm determines we have a material weakness or significant deficiency in our internal control over financial reporting once that firm begins our Section 404 reviews, investors may lose confidence in the accuracy and completeness of our financial reports, the market price of our common stock could decline, and we could be subject to sanctions or investigations by Nasdaq, the SEC or other regulatory authorities. Failure to remedy any material weakness in our internal control over financial reporting, or to implement or maintain other effective control systems required of public companies, could also restrict our future access to the capital markets.

Our executive officers, directors and principal stockholders own a significant percentage of our stock and, if they choose to act together, will be able to exert control or significantly influence over matters subject to stockholder approval.

As of June 30, 2023, our executive officers, directors and greater than 5% stockholders, in the aggregate, own approximately 8.1% of our outstanding common stock. As a result, such persons, or their appointees to our board of directors, acting together, will be able to

exert control or significantly influence over all matters submitted to our board of directors or stockholders for approval, including the appointment of our management, the election and removal of directors and approval of any significant transaction, as well as our management and business affairs. This concentration of ownership may have the effect of delaying, deferring, or preventing a change in control, impeding a merger, consolidation, takeover or other business combination involving us, or discouraging a potential acquiror from making a tender offer or otherwise attempting to obtain control of our business, even if such a transaction would benefit other stockholders.

During the quarterly period ended June 30, 2023, no director or officer adopted or terminated any Rule 10b5-1 trading arrangement, and/or any non-Rule 10b5-1 trading arrangement (as such terms are defined pursuant to Item 408(a) of Regulation S-K).

On August 7, 2023, the Company entered into a Lease Termination Agreement (the “Lease Termination Agreement”) for its headquarters and laboratory operating lease, pursuant to which the Company and the landlord mutually agreed to accelerate the termination date to August 31, 2023, subject to a termination fee paid by the Company of approximately $1.0 million. The Company entered into the Lease Termination Agreement primarily for the purpose of reducing the overall cash commitment and long-term liabilities related to the lease as part of the Company’s efforts to pursue potential strategic alternatives. The lease termination will eliminate the Company’s right-of-use asset and operating lease liabilities balance during the third quarter 2023 and result in the cancellation of the letter of credit during the fourth quarter of 2023, which will reclass $0.3 million of restricted cash to cash and cash equivalents on the accompanying condensed consolidated balance sheets.

+ Indicates a management contract or compensatory plan, contract or arrangement.

^ Non-material schedules and exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K. The Company hereby undertakes to furnish supplemental copies of any of the omitted schedules and exhibits upon request by the Securities and Exchange Commission.

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.


Delaware		20-3183915
(State or other jurisdiction of incorporation or organization)		(IRS Employer Identification No.)

10655 Sorrento Valley Road, Suite 200, San Diego CA		92121
(Address of principal executive offices)		(Zip Code)


PART I - FINANCIAL INFORMATION

Item 1.	Condensed Consolidated Financial Statements (unaudited)	3
	Condensed Consolidated Balance Sheets	3
	Condensed Consolidated Statements of Operations	4
	Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	5
	Condensed Consolidated Statements of Cash Flows	6
	Notes to Condensed Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	29
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	43
Item 4.	Controls and Procedures	43

PART II - OTHER INFORMATION

Item 1.	Legal Proceedings	44
Item 1A.	Risk Factors	44
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	69
Item 3.	Defaults Upon Senior Securities	69
Item 4.	Mine Safety Disclosures	69
Item 5.	Other Information	69
Item 6.	Exhibits	70
	Signatures	72


	June 30, 2023			December 31, 2022
	(unaudited)
Assets
Current assets
Cash and cash equivalents	$	7,259		$	12,109
Restricted cash		300			400
Accounts receivable, net		—			99
Prepaid and other current assets		715			848
Total current assets		8,274			13,456
Property and equipment, net		360			436
Right-of-use asset		4,492			4,658
Other assets		416			523
Total assets	$	13,542		$	19,073
Liabilities and stockholders’ equity
Current liabilities
Accounts payable	$	394		$	382
Accrued liabilities		291			595
Current portion of lease liabilities		265			238
Current portion of deferred revenue		19			19
Total current liabilities		969			1,234
Lease liabilities, non-current		4,239			4,379
Deferred revenue, non-current		69			79
Finance lease liability, non-current		—			5
Total liabilities		5,277			5,697
Commitments and contingencies (Note 8)
Stockholders’ equity
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at June 30, 2023 and December 31, 2022; no shares issued and outstanding at June 30, 2023 and December 31, 2022		—			—
Common stock, $0.0001 par value; 200,000,000 shares authorized at June 30, 2023 and December 31, 2022; 4,271,759 shares issued and outstanding at June 30, 2023 and December 31, 2022		5			5
Additional paid-in capital		103,124			102,673
Accumulated deficit		(93,835	)		(88,273	)
Total Histogen Inc. stockholders’ equity		9,294			14,405
Noncontrolling interest		(1,029	)		(1,029	)
Total equity		8,265			13,376
Total liabilities and stockholders’ equity	$	13,542		$	19,073


	Three Months Ended June 30,						Six Months Ended June 30,
	2023			2022			2023			2022

Revenue
License revenue	$	5		$	5		$	10		$	3,760
Total revenue		5			5			10			3,760
Operating expense
Research and development		536			1,093			1,529			3,025
General and administrative		1,557			2,306			4,043			4,812
Total operating expense		2,093			3,399			5,572			7,837
Loss from operations		(2,088	)		(3,394	)		(5,562	)		(4,077	)
Other income (expense)
Interest expense, net		(1	)		—			(1	)		(1	)
Gain on sale of subsidiary		—			—			1			—
Net loss		(2,089	)		(3,394	)		(5,562	)		(4,078	)
Loss (gain) attributable to noncontrolling interest		(3	)		6			—			17
Deemed dividend - accretion of discount and redemption feature of redeemable convertible preferred stock		—			(488	)		—			(488	)
Net loss available to common stockholders	$	(2,092	)	$	(3,876	)	$	(5,562	)	$	(4,549	)
Net loss per share available to common stockholders, basic and diluted	$	(0.49	)	$	(1.55	)	$	(1.30	)	$	(1.82	)
Weighted-average number of common shares outstanding used to compute net loss per share, basic and diluted		4,271,759			2,497,450			4,271,759			2,497,450


	Six Months Ended June 30,
	2023			2022
Cash flows from operating activities
Net loss	$	(5,562	)	$	(4,078	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		76			65
Stock-based compensation		451			280
Gain from sale of subsidiary		(1	)		—
Changes in operating assets and liabilities:
Accounts receivable		99			77
Prepaid expenses and other current assets		133			26
Other assets		107			113
Accounts payable		12			(868	)
Accrued liabilities		(304	)		(418	)
Right-of-use asset and lease liabilities, net		53			19
Deferred revenue		(10	)		(10	)
Net cash used in operating activities		(4,946	)		(4,794	)
Cash flows from investing activities
Cash proceeds from sale of subsidiary		1			—
Cash paid for property and equipment		—			(206	)
Net cash provided by (used in) investing activities		1			(206	)
Cash flows from financing activities
Costs paid in connection with December 2021 financing		—			(9	)
Repayment of finance lease obligations		(5	)		(5	)
Issuance costs for redeemable convertible preferred stock		—			(585	)
Redemption payment for redeemable convertible preferred stock		—			(488	)
Net cash used in financing activities		(5	)		(1,087	)
Net decrease in cash, cash equivalents and restricted cash		(4,950	)		(6,087	)
Cash, cash equivalents and restricted cash, beginning of period		12,509			19,085
Cash, cash equivalents and restricted cash, end of period	$	7,559		$	12,998
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	$	7,259		$	12,598
Restricted cash		300			400
Total cash, cash equivalents and restricted cash	$	7,559		$	12,998
Supplemental disclosure of cash flow information
Cash paid for interest	$	1		$	1
Noncash investing and financing activities
Redemption payment of redeemable convertible preferred stock from escrow	$	—		$	(4,762	)
Issuance of redeemable convertible preferred stock, proceeds held in escrow	$	—		$	4,762
Fair value of warrants issued to Placement Agent	$	—		$	34


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


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


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


	Redeemable Convertible Preferred Stock				Common Stock				Additional Paid-in		Accumulated			Total Histogen Inc. Stockholders’ Equity			Noncontrolling			Total Equity
	Shares		Amount		Shares		Amount		Capital		Deficit			(Deficit)			Interest			(Deficit)
Balance at December 31, 2022		—	$	—		4,271,759	$	5	$	102,673	$	(88,273	)	$	14,405		$	(1,029	)	$	13,376
Stock-based compensation expense		—		—		—		—		419		—			419			—			419
Net loss		—		—		—		—		—		(3,470	)		(3,470	)		(3	)		(3,473	)
Balance at March 31, 2023		—	$	—		4,271,759	$	5	$	103,092	$	(91,743	)	$	11,354		$	(1,032	)	$	10,322
Stock-based compensation expense		—		—		—		—		32		—			32			—			32
Net (loss) gain		—		—		—		—		—		(2,092	)		(2,092	)		3			(2,089	)
Balance at June 30, 2023		—	$	—		4,271,759	$	5	$	103,124	$	(93,835	)	$	9,294		$	(1,029	)	$	8,265


	June 30, 2023			December 31, 2022
Lab and manufacturing equipment	$	931		$	937
Office furniture and equipment		225			225
Software		48			48
Total		1,204			1,210
Less: accumulated depreciation and amortization		(844	)		(774	)
Property and equipment, net	$	360		$	436


Exhibit Number		Description of Exhibit
3.1		Amended and Restated Certificate of Incorporation of the Company (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on August 1, 2013).
3.2		Certificate of Amendment (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 27, 2020).
3.3		Certificate of Amendment (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 27, 2020).
3.4		Certificate of Amendment, filed June 1, 2022 (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 2, 2022).
3.5		Amended and Restated Bylaws (incorporated by reference to Exhibit 3.3 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 27, 2020).
3.6		Bylaw Amendment (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 25, 2022).
3.7		Certificate of Designation of Preferences, Rights and Limitations of Series A Redeemable Convertible Preferred Stock (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 25, 2022).
3.8		Certificate of Designation of Preferences, Rights and Limitations of Series B Redeemable Convertible Preferred Stock (incorporated by reference to Exhibit 3.3 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 25, 2022).
3.9		Certificate of Elimination relating to the Certificate of Designations of Preferences, Rights and Limitations of Series A Redeemable Convertible Preferred Stock (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 30, 2022).
3.10		Certificate of Elimination relating to the Certificate of Designations of Preferences, Rights and Limitations of Series B Redeemable Convertible Preferred Stock (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 30, 2022).
4.1		Specimen Common Stock Certificate (incorporated by reference to Exhibit 4.1 to the Company’s Quarterly Report on Form10-Q filed with the Securities and Exchange Commission on August 13, 2020).
4.2		Form of Warrant (incorporated by reference to Exhibit 4.5 to the Company’s Registration Statement on Form S-4 (Registration No. 333-236332) filed with the Securities and Exchange Commission on February 7, 2020).
4.3		Form of Warrant (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on November 12, 2020.)
4.4		Form of placement agent’s warrant (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on November 12, 2020.)
4.5		Form of Common Warrant (incorporated by reference to Exhibit 4.5 to the Company’s Registration Statement on Form S-1/A (File No. 333-251491) filed with the Securities and Exchange Commission on December 29, 2020).
4.6		Form of Placement Agent Warrant (incorporated by reference to Exhibit 4.6 to the Company’s Registration Statement on Form S-1/A (File No. 333-251491) filed with the Securities and Exchange Commission on December 29, 2020).
4.7		Form of Pre-Funded Warrant (incorporated by reference to Exhibit 4.7 to the Company’s Registration Statement on Form S-1/A (File No. 333-251491) filed with the Securities and Exchange Commission on December 29, 2020).
4.8		Form of Warrant (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on June 8, 2021).
4.9		Form of Placement Agent Warrant (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 8, 2021).
4.10		Form of Warrant (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on December 16, 2021).


4.11		Form of Placement Agent Warrant (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on December 16, 2021).
4.12		Form of Placement Agent Warrant (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 25, 2022).
4.13		Form of Pre-Funded Warrant (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 12, 2022).
4.14		Form of Series A Warrant to Purchase Common Stock (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 12, 2022).
4.15		Form of Series B Warrant to Purchase Common Stock (incorporated by reference to Exhibit 4.3 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 12, 2022).
4.16		Form of Placement Agent Warrant (incorporated by reference to Exhibit 4.4 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 12, 2022).
10.1*+		Amended and Restated 2020 Incentive Award Plan, effective June 20, 2023.
10.2*^		Lease Termination Agreement, dated August 7, 2023, between the Company and San Diego Sycamore, LLC.
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.
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).


	Histogen Inc.

Date: August 10, 2023	By:	/s/ Steven J. Mento, Ph.D.
		Steven J. Mento, Ph.D.
		President and Chief Executive Officer (Principal Executive Officer)

Date: August 10, 2023	By:	/s/ Susan A. Knudson
		Susan A. Knudson Chief Operations Officer and Chief Financial Officer
		(Principal Financial Officer)