10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2023

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

For the transition period from __________________________

Commission File Number 0-18277

VICOR CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	04-2742817
(State of Incorporation)	(I.R.S. Employer Identification No.)

25 Frontage Road, Andover, Massachusetts 01810

(Address of Principal Executive Office)

(978) 470-2900

(Registrant’s telephone number)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.01 per share	VICR	The NASDAQ Stock Market LLC

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

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

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

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

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 ☑

The number of shares outstanding of each of the issuer’s classes of Common Stock as of October 24, 2023 was:

Common Stock, $.01 par value	32,707,062
Class B Common Stock, $.01 par value	11,743,218

VICOR CORPORATION

INDEX

	Page
Part I — Financial Information:
Item 1 - Financial Statements (Unaudited)
Condensed Consolidated Balance Sheets at September 30, 2023 and December 31, 2022	1
Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2023 and 2022	2
Condensed Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2023 and 2022	3
Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2023 and 2022	4
Condensed Consolidated Statements of Equity for the three and nine months ended September 30, 2023 and 2022	5
Notes to Condensed Consolidated Financial Statements	7
Item 2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations	15
Item 3 — Quantitative and Qualitative Disclosures About Market Risk	24
Item 4 — Controls and Procedures	25
Part II — Other Information:	26
Item 1 — Legal Proceedings	26
Item 1A — Risk Factors	26
Item 5 — Other Information	26
Item 6 — Exhibits	26
Signature(s)	28
EX-31.1 SECTION 302 CERTIFICATION OF CEO
EX-31.2 SECTION 302 CERTIFICATION OF CFO
EX-32.1 SECTION 906 CERTIFICATION OF CEO
EX-32.2 SECTION 906 CERTIFICATION OF CFO

VICOR CORPORATION

Part I – Financial Information

Item 1 – Financial Statements

Condensed Consolidated Balance Sheets

(In thousands, except share data)

(Unaudited)

	September 30, 2023			December 31, 2022
Assets
Current assets:
Cash and cash equivalents	$	227,784		$	190,611
Accounts receivable, net		62,638			65,429
Inventories		104,570			101,410
Other current assets		3,975			5,154
Total current assets		398,967			362,604
Long-term deferred tax assets, net		341			280
Long-term investment, net		2,611			2,622
Property, plant and equipment, net		170,596			166,009
Other assets		11,620			5,386
Total assets	$	584,135		$	536,901
Liabilities and Equity
Current liabilities:
Accounts payable	$	14,146		$	22,207
Accrued compensation and benefits		11,534			10,849
Accrued litigation		6,500			6,500
Accrued expenses		5,438			8,613
Short-term lease liabilities		1,698			1,450
Sales allowances		2,553			1,661
Income taxes payable		1,046			72
Short-term deferred revenue and customer prepayments		3,618			13,197
Total current liabilities		46,533			64,549
Long-term deferred revenue		1,380			145
Long-term income taxes payable		848			862
Long-term lease liabilities		6,590			7,009
Total liabilities		55,351			72,565
Commitments and contingencies (Note 10)
Equity:
Vicor Corporation stockholders’ equity:
Class B Common Stock: 10 votes per share, $.01 par value,    14,000,000 shares authorized, 11,743,218 shares issued    and outstanding in 2023 and 2022		118			118
Common Stock: 1 vote per share, $.01 par value, 62,000,000 shares authorized    44,341,563 shares issued and 32,706,757 shares outstanding in 2023;    43,976,336 shares issued and 32,341,530 shares outstanding in 2022		445			441
Additional paid-in capital		380,151			360,365
Retained earnings		288,006			243,079
Accumulated other comprehensive loss		(1,245	)		(988	)
Treasury stock at cost: 11,634,806 shares in 2023 and 2022		(138,927	)		(138,927	)
Total Vicor Corporation stockholders’ equity		528,548			464,088
Noncontrolling interest		236			248
Total equity		528,784			464,336
Total liabilities and equity	$	584,135		$	536,901

See accompanying notes.

-1-

VICOR CORPORATION

Condensed Consolidated Statements of Operations

(In thousands, except per share amounts)

(Unaudited)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Net revenues	$	107,844		$	103,118		$	312,407		$	293,586
Cost of revenues		51,966			56,148			154,822			162,166
Gross margin		55,878			46,970			157,585			131,420
Operating expenses:
Selling, general and administrative		22,422			22,719			63,020			61,322
Research and development		17,752			14,747			50,556			44,516
		—			6,500			—			6,500
Total operating expenses		40,174			43,966			113,576			112,338
Income from operations		15,704			3,004			44,009			19,082
Other income (expense), net:
Total unrealized gains (losses) on available-for-sale    securities, net		20			—			(11	)		(87	)
Less: portion of (gains) losses recognized in other    comprehensive income		(20	)		1			11			90
Net credit gains recognized in earnings		—			1			—			3
Other income (expense), net		1,917			(569	)		5,643			(325	)
Total other income (expense), net		1,917			(568	)		5,643			(322	)
Income before income taxes		17,621			2,436			49,652			18,760
Provision for income taxes		1,038			641			4,716			1,395
Consolidated net income		16,583			1,795			44,936			17,365
Less: Net income (loss) attributable to    noncontrolling interest		1			3			9			(19	)
Net income attributable to Vicor Corporation	$	16,582		$	1,792		$	44,927		$	17,384
Net income per common share attributable to    Vicor Corporation:
Basic	$	0.37		$	0.04		$	1.01		$	0.40
Diluted	$	0.37		$	0.04		$	1.00		$	0.39
Shares used to compute net income per common share    attributable to Vicor Corporation:
Basic		44,433			44,031			44,275			43,986
Diluted		45,187			44,898			45,000			44,906

See accompanying notes.

-2-

VICOR CORPORATION

Condensed Consolidated Statements of Comprehensive Income

(In thousands)

(Unaudited)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Consolidated net income	$	16,583		$	1,795		$	44,936		$	17,365
Foreign currency translation losses, net of tax (1)		(77	)		(94	)		(267	)		(672	)
Unrealized gains (losses) on available-for-sale    securities, net of tax (1)		20			1,054			(11	)		671
Other comprehensive (loss) income		(57	)		960			(278	)		(1	)
Consolidated comprehensive income		16,526			2,755			44,658			17,364
Less: Comprehensive loss attributable to    noncontrolling interest		(6	)		(4	)		(12	)		(69	)
Comprehensive income attributable to
Vicor Corporation	$	16,532		$	2,759		$	44,670		$	17,433

(1)The deferred tax assets associated with foreign currency translation losses and unrealized gains (losses) on available-for-sale securities are completely offset by a tax valuation allowance as of September 30, 2023 and 2022. Therefore, there is no income tax benefit (provision) recognized for the three and nine months ended September 30, 2023 and 2022.

See accompanying notes.

-3-

VICOR CORPORATION

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Nine Months Ended
	September 30,
	2023			2022
Operating activities:
Consolidated net income	$	44,936		$	17,365
Adjustments to reconcile consolidated net income to net cash provided by operating    activities:
Depreciation and amortization		13,202			10,250
Stock-based compensation expense		9,287			7,445
Provision for doubtful accounts		43			5
Litigation-related expense		—			6,500
Amortization of Bond Premium		—			1,027
Credit gain on available-for-sale securities		—			(3	)
Increase in long-term deferred revenue		1,235			1,420
Increase in other assets		(260	)		(1,451	)
Deferred income taxes		(61	)		(52	)
Decrease in long-term income taxes payable		(14	)		(40	)
Change in current assets and liabilities, net		(15,374	)		(20,456	)
Net cash provided by operating activities		52,994			22,010
Investing activities:
Sales or maturities of short-term investments		—			25,000
Additions to property, plant and equipment and internal-use software		(26,289	)		(51,279	)
Net cash used for investing activities		(26,289	)		(26,279	)
Financing activities:
Proceeds from employee stock plans		10,503			4,147
Net cash provided by financing activities		10,503			4,147
Effect of foreign exchange rates on cash		(35	)		(198	)
Net increase (decrease) in cash and cash equivalents		37,173			(320	)
Cash and cash equivalents at beginning of period		190,611			182,418
Cash and cash equivalents at end of period	$	227,784		$	182,098

See accompanying notes.

-4-

VICOR CORPORATION

Condensed Consolidated Statements of Equity

(In thousands)

(Unaudited)

															Total
									Accumulated						Vicor
	Class B				Additional				Other						Corporation
	Common		Common		Paid-In		Retained		Comprehensive			Treasury			Stockholders’			Noncontrolling			Total
	Stock		Stock		Capital		Earnings		Loss			Stock			Equity			Interest			Equity
Three Months Ended September 30, 2023
Balance on June 30, 2023	$	118	$	443	$	368,914	$	271,424	$	(1,195	)	$	(138,927	)	$	500,777		$	242		$	501,019
Issuance of Common Stock under    employee stock plans				2		7,779										7,781						7,781
Stock-based compensation expense						3,458										3,458						3,458
Components of comprehensive    income (loss), net of tax:
Net income								16,582								16,582			1			16,583
Other comprehensive loss										(50	)					(50	)		(7	)		(57	)
Total comprehensive income (loss)																16,532			(6	)		16,526
Balance on September 30, 2023	$	118	$	445	$	380,151	$	288,006	$	(1,245	)	$	(138,927	)	$	528,548		$	236		$	528,784

															Total
									Accumulated						Vicor
	Class B				Additional				Other						Corporation
	Common		Common		Paid-In		Retained		Comprehensive			Treasury			Stockholders’			Noncontrolling			Total
	Stock		Stock		Capital		Earnings		Loss			Stock			Equity			Interest			Equity
Nine Months Ended September 30, 2023
Balance on December 31, 2022	$	118	$	441	$	360,365	$	243,079	$	(988	)	$	(138,927	)	$	464,088		$	248		$	464,336
Issuance of Common Stock under    employee stock plans				4		10,499										10,503						10,503
Stock-based compensation expense						9,287										9,287						9,287
Components of comprehensive    income (loss), net of tax:
Net income								44,927								44,927			9			44,936
Other comprehensive loss										(257	)					(257	)		(21	)		(278	)
Total comprehensive income (loss)																44,670			(12	)		44,658
Balance on September 30, 2023	$	118	$	445	$	380,151	$	288,006	$	(1,245	)	$	(138,927	)	$	528,548		$	236		$	528,784

-5-

VICOR CORPORATION

Condensed Consolidated Statements of Equity

(In thousands)

(Unaudited)

															Total
									Accumulated						Vicor
	Class B				Additional				Other						Corporation
	Common		Common		Paid-In		Retained		Comprehensive			Treasury			Stockholders’		Noncontrolling			Total
	Stock		Stock		Capital		Earnings		Income (Loss)			Stock			Equity		Interest			Equity
Three Months Ended September 30, 2022
Balance on June 30, 2022	$	118	$	440	$	352,253	$	233,225	$	(2,246	)	$	(138,927	)	$	444,863	$	241		$	445,104
Issuance of Common Stock under    employee stock plans						2,173										2,173					2,173
Stock-based compensation expense						2,829										2,829					2,829
Components of comprehensive    income (loss), net of tax:
Net income								1,792								1,792		3			1,795
Other comprehensive income (loss)										967						967		(7	)		960
Total comprehensive income (loss)																2,759		(4	)		2,755
Balance on September 30, 2022	$	118	$	440	$	357,255	$	235,017	$	(1,279	)	$	(138,927	)	$	452,624	$	237		$	452,861

															Total
									Accumulated						Vicor
	Class B				Additional				Other						Corporation
	Common		Common		Paid-In		Retained		Comprehensive			Treasury			Stockholders’		Noncontrolling			Total
	Stock		Stock		Capital		Earnings		Income (Loss)			Stock			Equity		Interest			Equity
Nine Months Ended September 30, 2022
Balance on December 31, 2021	$	118	$	439	$	345,664	$	217,633	$	(1,328	)	$	(138,927	)	$	423,599	$	306		$	423,905
Issuance of Common Stock under    employee stock plans				1		4,146										4,147					4,147
Stock-based compensation expense						7,445										7,445					7,445
Components of comprehensive    income (loss), net of tax:
Net income (loss)								17,384								17,384		(19	)		17,365
Other comprehensive income (loss)										49						49		(50	)		(1	)
Total comprehensive income (loss)																17,433		(69	)		17,364
Balance on September 30, 2022	$	118	$	440	$	357,255	$	235,017	$	(1,279	)	$	(138,927	)	$	452,624	$	237		$	452,861

See accompanying notes.

-6-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements of Vicor Corporation and its consolidated subsidiaries (collectively, the "Company") have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, these interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2023. The balance sheet at December 31, 2022 presented herein has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 filed by the Company with the SEC on February 28, 2023.

2. Inventories

Inventories were as follows (in thousands):

	September 30, 2023		December 31, 2022
Raw materials	$	86,710	$	82,181
Work-in-process		9,335		10,456
Finished goods		8,525		8,773
	$	104,570	$	101,410

3. Long-Term Investments

As of September 30, 2023 and December 31, 2022, the Company held one auction rate security with a par value of $3,000,000 and an estimated fair value of approximately $2,611,000 and $2,622,000, respectively, purchased through and held in custody by a broker-dealer affiliate of Bank of America, N.A., that has experienced failed auctions (the “Failed Auction Security”) since February 2008. The Failed Auction Security held by the Company is Aaa/AA+ rated by major credit rating agencies, is collateralized by student loans, and is guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program. Management is not aware of any reason to believe the issuer of the Failed Auction Security is presently at risk of default. Through September 30, 2023, the Company has continued to receive interest payments on the Failed Auction Security in accordance with the terms of its indenture. Management believes the Company ultimately should be able to liquidate the Failed Auction Security without significant loss primarily due to the overall quality of the issue held and the collateral securing the substantial majority of the underlying obligation. However, current conditions in the auction rate securities market have led management to conclude the recovery period for the Failed Auction Security exceeds 12 months. As a result, the Company continued to classify the Failed Auction Security as long-term as of September 30, 2023.

-7-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

Details of our investments are as follows (in thousands):

	September 30, 2023
	Cash and Cash		Long-Term
	Equivalents		Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	187,777	$	—
Failed Auction Security		—		2,611
Total		187,777		2,611
Other measurement basis:
Cash on hand		40,007		—
Total	$	227,784	$	2,611

	December 31, 2022
	Cash and Cash		Long-Term
	Equivalents		Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	143,274	$	—
Failed Auction Security		—		2,622
Total		143,274		2,622
Other measurement basis:
Cash on hand		47,337		—
Total	$	190,611	$	2,622

The following is a summary of the available-for-sale securities (in thousands):

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
September 30, 2023	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000		—		389	$	2,611

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
December 31, 2022	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000		—		378	$	2,622

As of September 30, 2023, the Failed Auction Security had been in an unrealized loss position for greater than 12 months.

The amortized cost and estimated fair value of the available-for-sale securities on September 30, 2023, by type and contractual maturities, are shown below (in thousands):

			Estimated
	Cost		Fair Value
Failed Auction Security:
Due in twenty years	$	3,000	$	2,611

-8-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

4. Fair Value Measurements

The Company accounts for certain financial assets at fair value, defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions market participants would use in pricing an asset or liability. A three-level hierarchy is used to show the extent and level of judgment used to estimate fair value measurements.

Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2023 (in thousands):

	Using
			Significant
	Quoted Prices		Other		Significant
	in Active		Observable		Unobservable		Total Fair
	Markets		Inputs		Inputs		Value as of
	(Level 1)		(Level 2)		(Level 3)		September 30, 2023
Cash equivalents:
Money market funds	$	187,777	$	—	$	—	$	187,777
Long-term investment:
Failed Auction Security		—		—		2,611		2,611

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2022 (in thousands):

	Using
			Significant
	Quoted Prices		Other		Significant
	in Active		Observable		Unobservable		Total Fair
	Markets		Inputs		Inputs		Value as of
	(Level 1)		(Level 2)		(Level 3)		December 31, 2022
Cash equivalents:
Money market funds	$	143,274	$	—	$	—	$	143,274
Long-term investment:
Failed Auction Security		—		—		2,622		2,622

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2023 was as follows (in thousands):

Balance at the beginning of the period	$	2,622
Loss included in Other comprehensive income		(11	)
Balance at the end of the period	$	2,611

Management utilized a probability weighted discounted cash flow model to determine the estimated fair value as of September 30, 2023.

-9-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

5. Revenues

The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands):

	Three Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
United States	$	21,279	$	18,889	$	40,168
Europe		10,392		5,808		16,200
Asia Pacific		17,024		33,623		50,647
All other		737		92		829
	$	49,432	$	58,412	$	107,844

	Nine Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
United States	$	60,764	$	48,426	$	109,190
Europe		24,893		15,869		40,762
Asia Pacific		46,998		112,686		159,684
All other		2,536		235		2,771
	$	135,191	$	177,216	$	312,407

	Three Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
United States	$	21,559	$	9,303	$	30,862
Europe		7,101		1,954		9,055
Asia Pacific		14,800		47,704		62,504
All other		456		241		697
	$	43,916	$	59,202	$	103,118

	Nine Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
United States	$	54,288	$	32,711	$	86,999
Europe		19,184		6,951		26,135
Asia Pacific		38,167		139,749		177,916
All other		2,157		379		2,536
	$	113,796	$	179,790	$	293,586

The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands):

	Three Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	27,748	$	37,384	$	65,132
Stocking distributors, net of sales allowances		21,461		9,673		31,134
Non-recurring engineering		223		6,726		6,949
Royalties		—		4,269		4,269
Other		—		360		360
	$	49,432	$	58,412	$	107,844

-10-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

	Nine Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	82,669	$	134,953	$	217,622
Stocking distributors, net of sales allowances		51,536		21,070		72,606
Non-recurring engineering		986		11,650		12,636
Royalties		—		8,745		8,745
Other		—		798		798
	$	135,191	$	177,216	$	312,407

	Three Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	29,051	$	53,033	$	82,084
Stocking distributors, net of sales allowances		14,288		2,869		17,157
Non-recurring engineering		577		2,249		2,826
Royalties		—		1,033		1,033
Other		—		18		18
	$	43,916	$	59,202	$	103,118

	Nine Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	77,018	$	162,483	$	239,501
Stocking distributors, net of sales allowances		35,960		9,715		45,675
Non-recurring engineering		818		5,543		6,361
Royalties		—		1,995		1,995
Other		—		54		54
	$	113,796	$	179,790	$	293,586

The following table presents the changes in certain contract assets and (liabilities) (in thousands):

	September 30, 2023			December 31, 2022			Change
Short-term deferred revenue and customer prepayments	$	(3,618	)	$	(13,197	)	$	9,579
Long-term deferred revenue		(1,380	)		(145	)	$	(1,235	)
Deferred expenses		30			577		$	(547	)
Sales allowances		(2,553	)		(1,661	)	$	(892	)

Deferred expenses are included in Other current assets in the accompanying Condensed Consolidated Balance Sheets.

The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. The Company recognized revenue of approximately $3,711,000 and $7,486,000 for the three and nine months ended September 30, 2023, respectively, and $1,149,000 and $2,015,000 for the three and nine months ended September 30, 2022 that was included in deferred revenue at the beginning of the respective period.

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

6. Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date. Stock-based compensation expense was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Cost of revenues	$	693	$	479	$	1,749	$	1,161
Selling, general and administrative		1,788		1,537		4,934		4,184
Research and development		977		813		2,604		2,100
Total stock-based compensation	$	3,458	$	2,829	$	9,287	$	7,445

Compensation expense by type of award was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Stock options	$	3,161	$	2,531	$	8,358	$	6,641
ESPP		297		298		929		804
Total stock-based compensation	$	3,458	$	2,829	$	9,287	$	7,445

7. Rental Income

Income, net under the Company’s operating lease agreement, for its owned facility leased to a third party in California, was approximately $198,000 for each of the three month periods ended September 30, 2023 and 2022 and $594,000 for each of the nine month periods ended September 30, 2023 and 2022.

8. Income Taxes

The provision for income taxes is based on the estimated annual effective tax rate for the year, which includes estimated federal, state and foreign income taxes on the Company’s projected pre-tax income.

The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Provision for income taxes	$	1,038		$	641		$	4,716		$	1,395
Effective income tax rate		5.9	%		26.3	%		9.5	%		7.4	%

The effective tax rates were lower than the statutory tax rates for the three and nine months ended September 30, 2023 and 2022 primarily due to the Company’s full valuation allowance position against domestic deferred tax assets. The provision for income taxes for the three and nine months ended September 30, 2023 and 2022 included estimated federal, state and foreign income taxes in jurisdictions in which the Company does not have sufficient tax attributes.

As of September 30, 2023, the Company has a valuation allowance of approximately $47,413,000 against all net domestic deferred tax assets for which realization cannot be considered more likely than not at this time. Management assesses the need for the valuation allowance on a quarterly basis. In assessing the need for a valuation allowance, the Company considers all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies, and past financial performance. Despite recent positive operating results, the Company faces uncertainties in forecasting its operating results due to supply and factory capacity constraints, certain process issues with the production of Advanced Products and the unpredictability in certain markets. This operating uncertainty also makes it difficult to predict the availability and utilization of tax

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

benefits over the next several years. As a result, management has concluded, as of September 30, 2023, it is more likely than not the Company’s net domestic deferred tax assets will not be realized, and a full valuation allowance against all net domestic deferred tax assets is still warranted as of September 30, 2023. The valuation allowance against these deferred tax assets may require adjustment in the future based on changes in the mix of temporary differences, changes in tax laws, and operating performance. If the positive operating results continue, and the Company’s concerns about industry uncertainty and world events, supply and factory capacity constraints, and process issues with the production of Advanced Products are resolved, and the amount of tax benefits the Company is able to utilize to the point that the Company believes future taxable income can be more reliably forecasted, the Company may release all or a portion of the valuation allowance in the near-term. If and when the Company determines the valuation allowance should be released (i.e., reduced), the adjustment would result in a tax benefit reported in that period’s Condensed Consolidated Statements of Operations, the effect of which would be an increase in reported net income.

The Company was informed in September 2021 by the Internal Revenue Service of their intention to examine the Company’s 2019 Federal income tax return. The IRS is in the process of closing examination of the 2019 tax year with no material adjustments. There are no other audits or examinations in process in any other jurisdiction.

9. Net Income per Share

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Numerator:
Net income attributable to Vicor Corporation	$	16,582	$	1,792	$	44,927	$	17,384
Denominator:
Denominator for basic net income per share-weighted    average shares (1)		44,433		44,031		44,275		43,986
Effect of dilutive securities:
Employee stock options (2)		754		867		725		920
Denominator for diluted net income per share – adjusted    weighted-average shares and assumed conversions		45,187		44,898		45,000		44,906
Basic net income per share	$	0.37	$	0.04	$	1.01	$	0.40
Diluted net income per share	$	0.37	$	0.04	$	1.00	$	0.39

(1)Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding.

(2)Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023, respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

10. Commitments and Contingencies

At September 30, 2023, the Company had approximately $14,416,000 of cancelable and non-cancelable capital expenditure commitments, principally for manufacturing equipment, and approximately $2,364,000 of capital expenditure items which had been received and included in Property, plant and equipment, net in the accompanying Condensed Consolidated Balance Sheets, but not yet paid for.

The Company is the defendant in a patent infringement lawsuit originally filed on January 28, 2011 by SynQor, Inc. (“SynQor”) in the U.S. District Court (the “District Court”) for the Eastern District of Texas. The complaint, as amended, alleged that the

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2023

(unaudited)

Company’s unregulated bus converters used in intermediate bus architecture power supply systems infringed SynQor’s U.S. patent numbers 7,072,190, 7,272,021, 7,564,702, and 8,023,290 (“the ‘190 patent”, “the ‘021 patent”, “the ‘702 patent”, and “the ‘290 patent”, respectively, and collectively the “SynQor Patents”). The Company asserted counterclaims against SynQor alleging unfair competition and tortious interference with business relations (the “Counterclaims”). As a result of certain actions by the United States Patent and Trademark Office (“USPTO”) and the District Court, SynQor’s infringement allegations regarding the ‘021 patent and the ‘290 patent were dismissed from the case prior to the beginning of trial. Specifically, the USPTO invalidated all the asserted claims of the ‘021 patent and that decision was upheld on appeal on August 30, 2017. In addition, on October 5, 2022, the District Court issued an order involuntarily dismissing the ‘290 patent infringement allegations on grounds of equitable and judicial estoppel, in view of representations by SynQor to the District Court agreeing to such dismissal as a condition of lifting a prior stay of the lawsuit. On January 18, 2023, the United States Court of Appeals for the Federal Circuit issued a decision upholding a decision of the Patent Trial and Appeal Board of the USPTO invalidating all claims of the ‘290 patent.

A trial in the District Court began on October 17, 2022 on the asserted claims of the ‘190 patent and the ‘702 patent, as well as on the Company’s Counterclaims. The District Court dismissed the Company’s Counterclaims on October 25, 2022. On October 26, 2022, the jury returned a verdict on SynQor’s patent infringement claims, finding that the Company willfully infringed the ‘702 patent, but did not infringe the ‘190 patent. The jury awarded SynQor damages in the amount of $6,500,000 for infringement of the ‘702 patent. All of the SynQor Patents expired in 2018.

On December 23, 2022, SynQor filed in the District Court (a) a motion for judgment as a matter of law that the Company infringed the ‘190 patent, (b) a motion requesting the District Court to award SynQor treble damages, as well as pre- and post-judgment interest, (c) a motion requesting the District Court to award SynQor its attorneys’ fees, and (d) a motion for a new trial. On December 23, 2022, the Company filed in the District Court (a) a motion requesting judgment as a matter of law that it did not infringe the ‘702 patent, and (b) a motion requesting judgment with respect to its defenses of equitable estoppel and waiver. The Court has not yet acted on any of these motions. To the extent that the District Court ultimately rules against the Company with respect to any of the aforementioned motions, the Company anticipates appealing those rulings to the United States Court of Appeals for the Federal Circuit. The Company similarly anticipates appealing the District Court’s order dismissing the Company’s Counterclaims against SynQor.

In accordance with applicable accounting standards, the Company recorded a litigation related accrual of $6,500,000 in the third quarter of 2022 as its estimate based on the jury award, using estimated outcomes ranging from $0 to treble damages plus attorney fees.

In addition, the Company is involved in certain other litigation and claims incidental to the conduct of its business, both as a defendant and a plaintiff. While the outcome of such other lawsuits and claims against the Company cannot be predicted with certainty, management does not expect such litigation or claims will have a material adverse impact on the Company’s financial position or results of operations.

11. Impact of Recently Issued Accounting Standards

New pronouncements issued but not effective until after September 30, 2023 are not expected to have a material impact on the Company’s consolidated financial statements.

-14-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

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

Cautionary Note Regarding Forward-Looking Statements

The Company’s consolidated operating results are affected by a wide variety of factors that could materially and adversely affect revenues and profitability, including the risk factors described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. As a result of these and other factors, the Company may experience material fluctuations in future operating results on a quarterly or annual basis, which could materially and adversely affect its business, consolidated financial condition, and operating results, and the share price of its Common Stock. This document and other documents filed by the Company with the Securities and Exchange Commission (“SEC”) include forward-looking statements regarding future events and the Company’s future results that are subject to the safe harbor afforded under the Private Securities Litigation Reform Act of 1995 and other safe harbors afforded under the Securities Act of 1933 and the Securities Exchange Act of 1934. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. Forward-looking statements are based on our current beliefs, expectations, estimates, forecasts, and projections for the future performance of the Company and are subject to risks and uncertainties. Forward-looking statements are identified by the use of words denoting uncertain, future events, such as “anticipate,” “assume,” “believe,” “continue,” “could,” “estimate,” “expect,” “future,” “goal,” “if,” “intend,” “may,” “plan,” “potential,” “project,” “prospective,” “seek,” “should,” “target,” “will,” or “would,” as well as similar words and phrases, including the negatives of these terms, or other variations thereof. Forward-looking statements also include, but are not limited to, statements regarding: our ability to address certain supply chain risks; our ongoing development of power conversion architectures, switching topologies, materials, packaging, and products; the ongoing transition of our business strategically, organizationally, and operationally from serving a large number of relatively low-volume customers across diversified markets and geographies to serving a small number of relatively large volume customers; our intent to enter new market segments; the levels of customer orders overall and, in particular, from large customers and the delivery lead times associated therewith; anticipated new and existing customer wins; the financial and operational impact of customer changes to shipping schedules; the derivation of a portion of our sales in each quarter from orders booked in the same quarter; our intent to expand the percentage of revenue associated with licensing our intellectual property to third parties; our plans to invest in expanded manufacturing capacity, including the expansion of our Andover facility and the introduction of new manufacturing processes, and the timing, location, and funding thereof; our belief that cash generated from operations together with our available cash and cash equivalents will be sufficient to fund planned operational needs and capital equipment purchases, for the foreseeable future; our outlook regarding tariffs and the impact thereof on our business; our belief that we have limited exposure to currency risks; our intentions regarding the declaration and payment of cash dividends; our intentions regarding protecting our rights under our patents; and our expectation that no current litigation or claims will have a material adverse impact on our financial position or results of operations. These forward-looking statements are based upon our current expectations and estimates associated with prospective events and circumstances that may or may not be within our control and as to which there can be no assurance. Actual results could differ materially from those implied by forward-looking statements as a result of various factors, including but not limited to those described above, as well as those described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 under Part I, Item 1 — “Business,” under Part I, Item 1A — “Risk Factors,” under Part I, Item 3 — “Legal Proceedings,” and under Part II, Item 7 — “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and those described in this Quarterly Report on Form 10-Q, particularly under Part I, Item 2 – “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” The discussion of our business contained herein, including the identification and assessment of factors that may influence actual results, may not be exhaustive. Therefore, the information presented should be read together with other documents we file with the SEC from time to time, including our Annual Reports on Form 10-K, our Quarterly Reports on Form 10-Q and our Current Reports on Form 8-K, which may supplement, modify, supersede, or update the factors discussed in this Quarterly Report on Form 10-Q. Any forward-looking statement made in this Quarterly Report on Form 10-Q is based on information currently available to us and speaks only as of the date on which it is made. We do not undertake any obligation to update any forward-looking statements as a result of future events or developments, except as required by law.

-15-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

Overview

We design, develop, manufacture, and market modular power components and power systems for converting electrical power for use in electrically-powered devices. Our competitive position is supported by innovations in product design and achievements in product performance, largely enabled by our focus on the research and development of advanced technologies and processes, often implemented in proprietary semiconductor circuitry, materials, and packaging. Many of our products incorporate patented or proprietary implementations of high-frequency switching topologies enabling power system solutions that are more efficient and much smaller than conventional alternatives. Our strategy emphasizes demonstrable product differentiation and a value proposition based on competitively superior solution performance, advantageous design flexibility, and a compelling total cost of ownership. While we offer a wide range of alternating current (“AC”) and direct current (“DC”) power conversion products, we consider our core competencies to be associated with 48V DC distribution, which offers numerous inherent cost and performance advantages over lower distribution voltages. However, we also offer products addressing other DC voltage standards (e.g., 380V for power distribution in data centers, 110V for rail applications, 28V for military and avionics applications, and 24V for industrial automation).

Based on design, performance, and form factor considerations, as well as the range of evolving applications for which our products are appropriate, we categorize our product portfolios as either “Advanced Products” or “Brick Products.” The Advanced Products category consists of our more recently introduced products, which are largely used to implement our proprietary Factorized Power Architecture™ (“FPA”), an innovative power distribution architecture enabling flexible, rapid power system design using individual components optimized to perform a specific conversion function.

The Brick Products category largely consists of our broad and well-established families of integrated power converters, incorporating multiple conversion stages, used in conventional power systems architectures. Given the growth profiles of the markets we serve with our Advanced Products line and our Brick Products line, our strategy involves a transition in organizational focus, emphasizing investment in our Advanced Products line and targeting high growth market segments with a low-mix, high-volume operational model, while maintaining a profitable business in the mature market segments we serve with our Brick Products line with a high-mix, low-volume operational model.

The applications in which our Advanced Products and Brick Products are used are typically in the higher-performance, higher-power segments of the market segments we serve. With our Advanced Products, we generally serve large Original Equipment Manufacturers (“OEMs”), Original Design Manufacturers (“ODMs”), and their contract manufacturers, with sales currently concentrated in the data center and hyperscaler segments of enterprise computing, in which our products are used for voltage distribution on server motherboards, in server racks, and across datacenter infrastructure. We have established a leadership position in the emerging market segment for powering high-performance processors used for acceleration of applications associated with artificial intelligence (“AI”). Our customers in the AI market segment include the leading innovators in processor and accelerator design, as well as early adopters in cloud computing and high performance computing. We also target applications in aerospace and aviation, defense electronics, industrial automation, instrumentation, test equipment, solid state lighting, telecommunications and networking infrastructure, and vehicles (notably in the autonomous driving, electric vehicle, and hybrid vehicle niches of the vehicle segment). With our Brick Products, we generally serve a fragmented base of large and small customers, concentrated in aerospace and defense electronics, industrial automation, industrial equipment, instrumentation and test equipment, and transportation (notably in rail and heavy equipment applications). With our strategic emphasis on larger, high-volume customers, we expect to experience over time a greater concentration of sales among relatively fewer customers.

Our quarterly consolidated operating results can be difficult to forecast and have been subject to significant fluctuations. We plan our production and inventory levels based on management’s estimates of customer demand, customer forecasts, and other information sources. Customer forecasts, particularly those of OEM, ODM, and contract manufacturing customers to which we supply Advanced Products in high volumes, are subject to scheduling changes on short notice, contributing to operating inefficiencies and excess costs. In addition, external factors such as supply chain uncertainties, which are often associated with the cyclicality of the electronics industry, regional macroeconomic and trade-related circumstances, and force majeure events (most recently evidenced by the COVID-19 pandemic), have caused our operating results to vary meaningfully. Supply chain disruptions, including those associated with our reliance on outsourced package process steps that are essential in the production of some of our Advanced Products, and those relating, for example, to the procurement of raw material, have in the past negatively impacted and may in the future negatively impact our operating results. We have taken steps to mitigate the impact of supply chain disruptions by, among other things and in varying degrees, moving outsourced manufacturing steps in-house to the Company, ordering supplies with extended lead times, paying higher prices for certain supplies or outsourced production, and expediting deliveries at a cost premium. The resulting

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VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

impact of the steps taken to mitigate supply chain disruptions have, to varying degrees and at different times, reduced our revenue, gross margin, operating profit and cash flow and may continue to do so in the future. While we continue to make progress in moving outsourced manufacturing steps in-house to the Company, we are still experiencing long lead times on certain raw material components, and uncertainty of output from our outsourced manufacturing supplier. Our quarterly gross margin as a percentage of net revenues may vary, depending on production volumes, average selling prices, average unit costs, the mix of products sold during that quarter, and the level of importation of raw materials subject to tariffs. Our quarterly operating margin as a percentage of net revenues also may vary with changes in revenue and product level profitability, but our operating costs are largely associated with compensation and related employee costs, which are not subject to sudden or significant changes.

Ongoing / Potential Impacts of COVID-19 on the Company

As of the date of this report, the number of Company employees diagnosed with COVID-19 and the corresponding absenteeism due to COVID-19 are negligible. While the productivity of our factory is not currently impacted by COVID-19, productivity may be reduced if quarantine rates were to increase. We continue to operate with three shifts in our factory, and, with few exceptions, our engineering, sales, and administrative personnel are working from the Company’s offices.

Although there is uncertainty as to whether COVID-19 levels will rise back to the levels seen during the pandemic that would impact our operational and financial results in the future, the Company’s high level of liquidity, flexible operational model, existing raw material inventories, and increased use of second sources for critical manufacturing inputs together support management’s belief that the Company will be able to effectively continue to conduct business.

Summary of Third Quarter 2023 Financial Performance Compared to Second Quarter 2023 Financial Performance

The following summarizes our financial performance for the third quarter of 2023, compared to the second quarter of 2023:

•Net revenues increased 1.0% to $107,844,000 for the third quarter of 2023, from $106,747,000 for the second quarter of 2023. Net revenues for Brick Products increased 26.0% compared to the second quarter of 2023, primarily due to favorable market conditions and available capacity for manufacturing Brick Products. Advanced Products net revenues decreased 13.5% compared to the second quarter of 2023, primarily due to manufacturing constraints and schedule delays.

•Export sales represented approximately 62.8% of total net revenues in the third quarter of 2023 as compared to 68.1% in the second quarter of 2023.

•Gross margin increased to $55,878,000 for the third quarter of 2023 from $55,173,000 for the second quarter of 2023, with gross margin, as a percentage of net revenues, increasing to 51.8% for the third quarter of 2023 from 51.7% for the second quarter of 2023. The increase in gross margin dollars and gross margin percentage was primarily due to the favorable change in higher sales volume and improved sales mix, and certain reductions in supply chain costs, including a reduction of $479,000 in outsourced manufacturing costs partially offset by incremental costs of bringing production in-house for certain Advanced Products, and an increase of freight-in and tariff spending of $2,293,000 (net of approximately $0 in duty drawback recovery of previously paid tariffs in the third quarter of 2023 and $2,750,000 in duty drawback recovery in the second quarter of 2023).

•Backlog, which represents the total value of orders for products for which shipment is scheduled within the next 12 months, was approximately $174,721,000 at the end of the third quarter of 2023, as compared to $217,275,000 at the end of the second quarter of 2023.

•Operating expenses for the third quarter of 2023 increased $2,864,000, or 7.7%, to $40,174,000 from $37,310,000 for the second quarter of 2023. Selling, general and administrative expenses increased approximately $2,047,000, primarily due to an increase in legal fees. Research and development expenses increased approximately $817,000, primarily due to a decrease in overhead absorption and an increased consumption of project materials.

•We reported net income for the third quarter of 2023 of $16,582,000, or $0.37 per diluted share, compared to net income of $17,101,000, or $0.38 per diluted share, for the second quarter of 2023.

-17-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

•For the third quarter of 2023, depreciation and amortization totaled $4,554,000 and capital additions totaled $7,662,000 as compared to depreciation and amortization of $4,449,000 and capital additions of $8,538,000 for the second quarter of 2023.

•Inventories decreased by approximately $2,036,000, or 1.9%, to $104,570,000 at September 30, 2023, compared to $106,606,000 at June 30, 2023.

Three Months Ended September 30, 2023 Compared to Three Months Ended September 30, 2022

Net revenues for the third quarter of 2023 were $107,844,000, an increase of $4,726,000, or 4.6%, as compared to $103,118,000 for the third quarter of 2022. Net revenues, by product line, for the three months ended September 30, 2023 and 2022 were as follows (dollars in thousands):

					Increase (decrease)
	2023		2022		$			%
Advanced Products	$	58,412	$	59,202	$	(790	)		(1.3	)%
Brick Products		49,432		43,916		5,516			12.6	%
Total	$	107,844	$	103,118	$	4,726			4.6	%

The decrease in net revenues for Advanced Products was primarily due to manufacturing constraints and schedule delays. The increase in net revenues for Brick Products was primarily due to favorable market conditions and available capacity for manufacturing Brick Products.

Gross margin for the third quarter of 2023 increased $8,908,000, or 19.0%, to $55,878,000, from $46,970,000 for the third quarter of 2022. Gross margin, as a percentage of net revenues, increased to 51.8% for the third quarter of 2023, compared to 45.5% for the third quarter of 2022. The increase in gross margin dollars and gross margin percentage was primarily due to favorable changes in higher sales volume and improved sales mix, and certain reductions in supply chain costs, including a reduction of $2,310,000 in outsourced manufacturing costs partially offset by incremental costs of bringing production in-house for certain Advanced Products, and a reduction of freight-in and tariff spending of $2,261,000. There was no duty drawback in either the third quarter of 2023 or the third quarter of 2022.

Selling, general and administrative expenses were $22,422,000 for the third quarter of 2023, a decrease of $297,000, or 1.3%, from $22,719,000 for the third quarter of 2022. Selling, general and administrative expenses as a percentage of net revenues decreased to 20.8% for the third quarter of 2023 from 22.0% for the third quarter of 2022. The components of the $297,000 decrease in selling, general and administrative expenses for the third quarter of 2023 from the third quarter of 2022 were as follows (dollars in thousands):

	Increase (decrease)
Legal fees	$	(1,449	)	(32.8	)%	(1	)
Advertising		(134	)	(10.0	)%
Commissions		141		17.2	%
Compensation		424		3.6	%	(2	)
Outside services		751		116.2	%	(3	)
Other, net		(30	)	(0.8	)%
	$	(297	)	(1.3	)%

(1)Decrease primarily attributable to a decrease in activity related to the SynQor litigation (see Note 10 to the Condensed Consolidated Financial Statements).

(2)Increase primarily attributable to annual compensation adjustments in May 2023 and higher stock-based compensation expense associated with stock options awarded in May 2023.

(3)Increase primarily attributable to an increase in the use of consultants.

-18-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

Research and development expenses were $17,752,000 for the third quarter of 2023, an increase of $3,005,000, or 20.4%, compared to $14,747,000 for the third quarter of 2022. As a percentage of net revenues, research and development expenses increased to 16.5% for the third quarter of 2023 from 14.3% for the third quarter of 2022. The components of the $3,005,000 increase in research and development expenses were as follows (dollars in thousands):

	Increase
Project and pre-production materials	$	1,635	103.8	%	(1	)
Compensation		624	6.0	%	(2	)
Overhead absorption		388	59.1	%	(3	)
Depreciation and amortization		91	14.6	%
Other, net		267	9.3	%
	$	3,005	20.4	%

(1)Increase primarily attributable to increased prototype development costs for Advanced Products.

(2)Increase primarily attributable to annual compensation adjustments in May 2023 and higher stock-based compensation expense associated with stock options awarded in May 2023.

(3)Increase primarily attributable to a decrease in research and development (“R&D”) personnel incurring time on production activities, compared to R&D activities.

The significant components of ''Other income (expense), net'' for the three months ended September 30, and the changes between the periods were as follows (in thousands):

	2023			2022			Increase
Interest income (expense), net	$	1,989		$	(315	)	$	2,304
Rental income		198			198			—
Foreign currency losses, net		(273	)		(453	)		180
Other, net		3			2			1
	$	1,917		$	(568	)	$	2,485

Our exposure to market risk fluctuations in foreign currency exchange rates relates to the operations of Vicor Japan Company, Ltd. (“VJCL”), for which the functional currency is the Japanese Yen, and all other subsidiaries in Europe and Asia, for which the functional currency is the U.S. Dollar. These subsidiaries in Europe and Asia experienced more favorable foreign currency exchange rate fluctuations in the third quarter of 2023 compared to the third quarter of 2022. Interest income for the three months ended September 30, 2023 has increased due to higher interest rates received on the cash and cash equivalents balance the Company holds.

Income before income taxes was $17,621,000 for the third quarter of 2023, as compared to $2,436,000 for the third quarter of 2022.

The provision for income taxes and the effective income tax rates for the three months ended September 30, 2023 and 2022 were as follows (dollars in thousands):

	2023			2022
Provision for income taxes	$	1,038		$	641
Effective income tax rate		5.9	%		26.3	%

The effective tax rates were lower than the statutory tax rates for the three months ended September 30, 2023 and 2022 primarily due to the Company’s full valuation allowance position against domestic deferred tax assets. The provision for income taxes

-19-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

for the three months ended September 30, 2023 and 2022 included estimated federal, state and foreign income taxes in jurisdictions in which the Company does not have sufficient tax attributes.

See Note 8 to the Condensed Consolidated Financial Statements for disclosure regarding our current assessment of the valuation allowance against all domestic deferred tax assets, and the possible release (i.e., reduction) of the allowance in the future.

We reported net income for the third quarter of 2023 of $16,582,000, or $0.37 per diluted share, compared to $1,792,000, or $0.04 per diluted share, for the third quarter of 2022.

Nine Months Ended September 30, 2023 Compared to Nine Months Ended September 30, 2022

Net revenues for the nine months ended September 30, 2023 were $312,407,000, an increase of $18,821,000, or 6.4%, from $293,586,000 for the nine months ended September 30, 2022. Net revenues, by product line, for the nine months ended September 30, 2023 and the nine months ended September 30, 2022 were as follows (dollars in thousands):

					(Decrease) increase
	2023		2022		$			%
Advanced Products	$	177,216	$	179,790	$	(2,574	)		(1.4	)%
Brick Products		135,191		113,796		21,395			18.8	%
Total	$	312,407	$	293,586	$	18,821			6.4	%

The decrease in net revenues for Advanced Products was primarily due to manufacturing constraints and schedule delays. The increase in net revenues for Brick Products was primarily due to favorable market conditions and available capacity for manufacturing Brick Products.

Gross margin for the nine months ended September 30, 2023 increased $26,165,000, or 19.9%, to $157,585,000 from $131,420,000 for the nine months ended September 30, 2022. Gross margin, as a percentage of net revenues, increased to 50.4% for the nine month period ended September 30, 2023, as compared to 44.8% for the nine month period ended September 30, 2022. The increase in gross margin dollars and gross margin percentage was primarily due to favorable changes in higher sales volume and improved sales mix, and certain reductions in supply chain costs, including a reduction of $7,754,000 in outsourced manufacturing costs partially offset by incremental costs of bringing production in-house for certain Advanced Products, and a reduction of freight-in and tariff spending of $10,195,000 (net of approximately $5,715,000 in duty drawback recovery of previously paid tariffs in the nine months ended September 30, 2023 and $0 in duty drawback recovery in the nine months ended September 30, 2022).

Selling, general and administrative expenses were $63,020,000 for the nine months ended September 30, 2023, an increase of $1,698,000, or 2.8%, compared to $61,322,000 for the nine months ended September 30, 2022. Selling, general and administrative expenses as a percentage of net revenues decreased to 20.2% for the nine months ended September 30, 2023 from 20.9% for the nine months ended September 30, 2022. The components of the $1,698,000 increase in selling, general and administrative expenses for the nine months ended September 30, 2023 compared to the nine months ended September 30, 2022 were as follows (dollars in thousands):

	Increase (decrease)
Compensation	$	1,091		3.1	%	(1	)
Outside services		867		40.1	%	(2	)
Advertising		658		22.5	%	(3	)
Commissions		479		21.2	%	(4	)
Depreciation and amortization		322		10.1	%	(5	)
Travel expense		319		22.0	%	(6	)
Audit fees		158		9.7	%
Legal fees		(2,599	)	(33.4	)%	(7	)
Other, net		403		9.6	%
	$	1,698		2.8	%

-20-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

(1)Increase primarily attributable to annual compensation adjustments in May 2023 and higher stock-based compensation expense associated with stock options awarded in May 2023.

(2)Increase primarily attributable to an increase in the use of consultants.

(3)Increase primarily attributable to increases in sales support expenses, direct mailings, and advertising in trade publications.

(4)Increase primarily attributable to an increase in net revenues subject to commissions.

(5)Increase attributable to net additions of furniture and fixtures and capitalization of building improvements.

(6)Increase primarily attributable to an increase in travel by the Company’s sales and marketing personnel.

(7)Decrease primarily attributable to a decrease in activity related to the SynQor litigation (see Note 10 to the Condensed Consolidated Financial Statements) and for certain corporate legal matters.

Research and development expenses were $50,556,000 for the nine months ended September 30, 2023, an increase of $6,040,000, or 13.6%, from $44,516,000 for the nine months ended September 30, 2022. As a percentage of net revenues, research and development expenses increased to 16.2% for the nine months ended September 30, 2023 from 15.2% for the nine months ended September 30, 2022. The components of the $6,040,000 increase in research and development expenses for the nine months ended September 30, 2023 compared to the nine months ended September 30, 2022 were as follows (dollars in thousands):

	Increase (decrease)
Compensation	$	2,512		8.2	%	(1	)
Project and pre-production materials		2,886		49.0	%	(2	)
Computer and software expense		237		30.4	%	(3	)
Depreciation and amortization		255		14.1	%	(4	)
Supplies		122		6.4	%
Outside services		207		43.8	%	(5	)
Overhead absorption		(478	)	(34.1	)%	(6	)
Other, net		299		6.6	%
	$	6,040		13.6	%

(1)Increase primarily attributable to annual compensation adjustments in May 2023 and higher stock-based compensation expense associated with stock options awarded in May 2023.

(2)Increase primarily attributable to increased prototype development costs for Advanced Products.

(3)Increase primarily due to increased activities to upgrade computer and software systems.

(4)Increase attributable to net additions of furniture and fixtures and capitalization of building improvements.

(5)Increase primarily attributable to an increase in the use of consultants.

(6)Decrease primarily attributable to an increase in R&D personnel incurring time on production activities, compared to R&D activities.

The significant components of ''Other income (expense), net'' for the nine months ended September 30, 2023 and the nine months ended September 30, 2022 and the changes from period to period were as follows (in thousands):

							Increase
	2023			2022			(decrease)
Interest income (expense), net	$	5,500		$	107		$	5,393
Rental income		594			594			-
Foreign currency losses, net		(466	)		(1,057	)		591
Other, net		15			34			(19	)

-21-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

$ 5,643 $ (322 ) $ 5,965

Our exposure to market risk fluctuations in foreign currency exchange rates relates to the operations of VJCL, for which the functional currency is the Japanese Yen, and all other subsidiaries in Europe and Asia, for which the functional currency is the U.S. Dollar. These subsidiaries in Europe and Asia experienced more favorable foreign currency exchange rate fluctuations in the first nine months of 2023 compared to the first nine months of 2022. Interest income for the nine months ended September 30, 2023 has increased due to higher interest rates received on the cash and cash equivalents balance the Company holds.

Income before income taxes was $49,652,000 for the nine months ended September 30, 2023, as compared to $18,760,000 for the nine months ended September 30, 2022.

The provision for income taxes and the effective income tax rates for the nine months ended September 30, 2023 and 2022 were as follows (dollars in thousands):

	2023			2022
Provision for income taxes	$	4,716		$	1,395
Effective income tax rate		9.5	%		7.4	%

The effective tax rates were lower than the statutory tax rates for the nine months ended September 30, 2023 and 2022 primarily due to the Company’s full valuation allowance position against domestic deferred tax assets. The provision for income taxes for the nine months ended September 30, 2023 and 2022 included estimated federal, state and foreign income taxes in jurisdictions in which the Company does not have sufficient tax attributes.

See Note 8 to the Condensed Consolidated Financial Statements for disclosure regarding our current assessment of the valuation allowance against all domestic deferred tax assets, and the possible release (i.e., reduction) of the allowance in the future.

We reported net income for the nine months ended September 30, 2023 of $44,927,000, or $1.00 per diluted share, as compared to $17,384,000, or $0.39 per diluted share, for the nine months ended September 30, 2022.

Liquidity and Capital Resources

As of September 30, 2023, we had $227,784,000 in cash and cash equivalents. The ratio of total current assets to total current liabilities was 8.6:1 as of September 30, 2023 and 5.6:1 as of December 31, 2022. Working capital, defined as total current assets less total current liabilities, increased $54,379,000 to $352,434,000 as of September 30, 2023 from $298,055,000 as of December 31, 2022.

The changes in working capital from December 31, 2022 to September 30, 2023 were as follows (in thousands):

	Increase (decrease)
Cash and cash equivalents	$	37,173
Accounts receivable		(2,791	)
Inventories		3,160
Other current assets		(1,179	)
Accounts payable		8,061
Accrued compensation and benefits		(685	)
Accrued expenses		3,175
Short-term deferred revenue		9,579
Other		(2,114	)
	$	54,379

-22-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2023

The primary sources of cash for the nine months ended September 30, 2023 were $52,994,000 generated from operations, and $10,503,000 received in connection with the exercise of options to purchase our Common Stock awarded under our stock option plans and the issuance of Common Stock under our 2017 Employee Stock Purchase Plan. The primary uses of cash during the nine months ended September 30, 2023 were for the purchase of property and equipment of $26,289,000.

In November 2000, our Board of Directors authorized the repurchase of up to $30,000,000 of our Common Stock (the “November 2000 Plan”). The November 2000 Plan authorizes us to make such repurchases from time to time in the open market or through privately negotiated transactions. The timing and amounts of Common Stock repurchases are at the discretion of management based on its view of economic and financial market conditions. We did not repurchase shares of Common Stock under the November 2000 Plan during the nine months ended September 30, 2023. As of September 30, 2023, we had approximately $8,541,000 remaining available for repurchases of our Common Stock under the November 2000 Plan.

As of September 30, 2023, we had a total of approximately $14,416,000 of cancelable and non-cancelable capital expenditure commitments, principally for manufacturing and production equipment, which we intend to fund with existing cash, and approximately $2,364,000 of capital expenditure items which had been received and included in Property, plant and equipment, net in the accompanying Condensed Consolidated Balance Sheets, but not yet paid for. Our primary needs for liquidity are for making continuing investments in manufacturing and production equipment. We believe cash generated from operations together with our available cash and cash equivalents will be sufficient to fund planned operational needs and capital equipment purchases, for both the short and long term.

We do not consider the impact of inflation or fluctuations in the exchange rates for foreign currency transactions to have been significant during the last three fiscal years.

Critical Accounting Policies and Estimates

There have been no material changes in our judgments and assumptions associated with the development of our critical accounting estimates during the period ended September 30, 2023. Refer to the section entitled “Critical Accounting Policies and Estimates” in Part II, Item 7 – “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

-23-

Vicor Corporation

September 30, 2023

Item 3 — Quantitative and Qualitative Disclosures About Market Risk

We are exposed to a variety of market risks, including changes in interest rates affecting the return on our cash and cash equivalents, our short-term investments and fluctuations in foreign currency exchange rates. As our cash and cash equivalents and short-term investments consist principally of cash accounts, money market securities, and U.S. Treasury securities, which are short-term in nature, we believe our exposure to market risk on interest rate fluctuations for these investments is not significant. As of September 30, 2023, our long-term investment portfolio, recorded on our Condensed Consolidated Balance Sheet as “Long-term investment, net”, consisted of a single auction rate security with a par value of $3,000,000, purchased through and held in custody by a broker-dealer affiliate of Bank of America, N.A., that has experienced failed auctions (the “Failed Auction Security”) since February 2008. While the Failed Auction Security is Aaa/AA+ rated by major credit rating agencies, collateralized by student loans and guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program, continued failure to sell at its periodic auction dates (i.e., reset dates) could negatively impact the carrying value of the investment, in turn leading to impairment charges in future periods. Periodic changes in the fair value of the Failed Auction Security attributable to credit loss (i.e., risk of the issuer’s default) are recorded through earnings as a component of “Other income (expense), net”, with the remainder of any periodic change in fair value not related to credit loss (i.e., temporary “mark-to-market” carrying value adjustments) recorded in “Accumulated other comprehensive loss”, a component of Stockholders’ Equity. Should we conclude a decline in the fair value of the Failed Auction Security is other than temporary, such losses would be recorded through earnings as a component of “Other income (expense), net”. We do not believe there was an “other-than-temporary” decline in value in this security as of September 30, 2023.

Our exposure to market risk for fluctuations in foreign currency exchange rates relates to the operations of VJCL, for which the functional currency is the Japanese Yen, and changes in the relative value of the Yen to the U.S. Dollar. The functional currency of all other subsidiaries in Europe and other subsidiaries in Asia is the U.S. Dollar. While we believe the risk of fluctuations in foreign currency exchange rates for these subsidiaries is generally not significant, they can be subject to substantial currency changes, and therefore foreign exchange exposures.

-24-

Vicor Corporation

September 30, 2023

Item 4 — Controls and Procedures

(a)Disclosure regarding controls and procedures.

As required by Rule 13a-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), management, with the participation of our Chief Executive Officer (“CEO”) (who is our principal executive officer) and Chief Financial Officer (“CFO”) (who is our principal financial officer), conducted an evaluation of the effectiveness of our disclosure controls and procedures as of the end of the last fiscal quarter (i.e., September 30, 2023). The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the Securities and Exchange Commission’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure information required to be disclosed by a company in the reports it files or submits under the Exchange Act is accumulated and communicated to the company's management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of September 30, 2023, our CEO and CFO concluded, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. Accordingly, management, including the CEO and CFO, recognizes our disclosure controls or our internal control over financial reporting may not prevent or detect all errors and all fraud. The design of a control system must reflect the fact there are resource constraints, and the benefits of controls must be considered relative to their costs. Further, because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Controls can also 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 is based in part on 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. Projections of any control’s effectiveness to future periods are subject to risks. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of compliance with policies or procedures.

(b)Changes in internal control over financial reporting.

There was no change in our internal control over financial reporting that occurred during the fiscal quarter ended September 30, 2023, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

-25-

Vicor Corporation

Part II – Other Information

September 30, 2023

Item 1 — Legal Proceedings

See Note 10. Commitments and Contingencies in the Notes to Condensed Consolidated Financial Statements in Part I, Item 1 – “Financial Statements.”

Item 1A — Risk Factors

There have been no material changes in the risk factors described in Part I, Item 1A – “Risk Factors” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

Item 5 — Other Information

During the three months ended September 30, 2023, no director or Section 16 officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

Item 6 — Exhibits

Exhibit Number	Description
3.1	Restated Certificate of Incorporation, dated February 28, 1990 (1)
3.2	Certificate of Ownership and Merger Merging Westcor Corporation, a Delaware Corporation, into Vicor Corporation, a Delaware corporation, dated December 3, 1990 (1)
3.3	Certificate of Amendment of Restated Certificate of Incorporation, dated May 10, 1991 (1)
3.4	Certificate of Amendment of Restated Certificate of Incorporation, dated June 23, 1992 (1)
3.5	Bylaws, as amended (2)
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act.
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act.
32.1	Certification of Chief 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 Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)
	(1) Filed as an exhibit to the Company’s Annual Report on Form 10-K filed on March 29, 2001 (File No. 000-18277) and incorporated herein by reference.

-26-

(2) Filed as an exhibit to the Company’s Current Report on Form 8-K filed on June 4, 2020 (File No. 000-18277) and incorporated herein by reference.

-27-

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	VICOR CORPORATION
Date: November 3, 2023	By:	/s/ Patrizio Vinciarelli
		Patrizio Vinciarelli
		Chairman of the Board, President and
		Chief Executive Officer
		(Principal Executive Officer)
Date: November 3, 2023	By:	/s/ James F. Schmidt
		James F. Schmidt
		Vice President, Chief Financial Officer
		(Principal Financial Officer)

-28-

EX-31.1

Exhibit 31.1

CHIEF EXECUTIVE OFFICER CERTIFICATION

I, Patrizio Vinciarelli, certify:

1.I have reviewed this Quarterly Report on Form 10-Q of Vicor Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: November 3, 2023	/s/ Patrizio Vinciarelli
	Patrizio Vinciarelli
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CHIEF FINANCIAL OFFICER CERTIFICATION

I, James F. Schmidt, certify:

1.I have reviewed this Quarterly Report on Form 10-Q of Vicor Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: November 3, 2023	/s/ James F. Schmidt
	James F. Schmidt
	Vice President, Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Vicor Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Patrizio Vinciarelli, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Patrizio Vinciarelli

Patrizio Vinciarelli

President, Chairman of the Board and

Chief Executive Officer

November 3, 2023

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Vicor Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James F. Schmidt, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ James F. Schmidt

James F. Schmidt

Vice President, Chief Financial Officer

November 3, 2023

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Oct. 24, 2023
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Registrant Name	VICOR CORPORATION
Entity Central Index Key	0000751978
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	VICR
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Document Transition Report	false
Document Quarterly Report	true
Securities Act File Number	0-18277
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2742817
Entity Address, Address Line One	25 Frontage Road
Entity Address, City or Town	Andover
Entity Address, Postal Zip Code	01810
City Area Code	978
Local Phone Number	470-2900
Security Exchange Name	NASDAQ
Entity Address, State or Province	MA
Title of 12(b) Security	Common Stock
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		32,707,062
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,743,218

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 227,784	$ 190,611
Accounts receivable, net	62,638	65,429
Inventories	104,570	101,410
Other current assets	3,975	5,154
Total current assets	398,967	362,604
Long-term deferred tax assets, net	341	280
Long-term investment, net	2,611	2,622
Property, plant and equipment, net	170,596	166,009
Other assets	11,620	5,386
Total assets	584,135	536,901
Current liabilities:
Accounts payable	14,146	22,207
Accrued compensation and benefits	11,534	10,849
Accrued litigation	6,500	6,500
Accrued expenses	5,438	8,613
Short-term lease liabilities	1,698	1,450
Sales allowances	2,553	1,661
Income taxes payable	1,046	72
Short-term deferred revenue and customer prepayments	3,618	13,197
Total current liabilities	46,533	64,549
Long-term deferred revenue	1,380	145
Long-term income taxes payable	848	862
Long-term lease liabilities	6,590	7,009
Total liabilities	55,351	72,565
Commitments and contingencies (Note 10)
Vicor Corporation stockholders' equity:
Additional paid-in capital	380,151	360,365
Retained earnings	288,006	243,079
Accumulated other comprehensive loss	(1,245)	(988)
Treasury stock at cost: 11,634,806 shares in 2023 and 2022	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	528,548	464,088
Noncontrolling interest	236	248
Total equity	528,784	464,336
Total liabilities and equity	584,135	536,901
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	118	118
Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 445	$ 441

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Condensed Consolidated Balance Sheets (Parenthetical)	Sep. 30, 2023 Vote $ / shares shares	Dec. 31, 2022 Vote $ / shares shares
Treasury stock, shares	11,634,806	11,634,806
Class B Common Stock [Member]
Common Stock, votes per share | Vote	10	10
Common Stock, par value | $ / shares	$ 0.01	$ 0.01
Common Stock, shares authorized	14,000,000	14,000,000
Common Stock, shares issued	11,743,218	11,743,218
Common Stock, shares outstanding	11,743,218	11,743,218
Common Stock [Member]
Common Stock, votes per share | Vote	1	1
Common Stock, par value | $ / shares	$ 0.01	$ 0.01
Common Stock, shares authorized	62,000,000	62,000,000
Common Stock, shares issued	44,341,563	43,976,336
Common Stock, shares outstanding	32,706,757	32,341,530

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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net revenues		$ 107,844	$ 103,118	$ 312,407	$ 293,586
Cost of revenues		51,966	56,148	154,822	162,166
Gross margin		55,878	46,970	157,585	131,420
Operating expenses:
Selling, general and administrative		22,422	22,719	63,020	61,322
Research and development		17,752	14,747	50,556	44,516
Litigation-related		0	6,500	0	6,500
Total operating expenses		40,174	43,966	113,576	112,338
Income from operations		15,704	3,004	44,009	19,082
Other income (expense), net:
Total unrealized gains (losses) on available-for-sale securities, net		20	0	(11)	(87)
Less: portion of (gains) losses recognized in other comprehensive income		(20)	1	11	90
Net credit gains recognized in earnings		0	1	0	3
Other income (expense), net		1,917	(569)	5,643	(325)
Total other income (expense), net		1,917	(568)	5,643	(322)
Income before income taxes		17,621	2,436	49,652	18,760
Provision for income taxes		1,038	641	4,716	1,395
Consolidated net income		16,583	1,795	44,936	17,365
Less: Net income (loss) attributable to noncontrolling interest		1	3	9	(19)
Net income attributable to Vicor Corporation		$ 16,582	$ 1,792	$ 44,927	$ 17,384
Net income per common share attributable to Vicor Corporation:
Basic		$ 0.37	$ 0.04	$ 1.01	$ 0.4
Diluted		$ 0.37	$ 0.04	$ 1	$ 0.39
Shares used to compute net income per common share attributable to Vicor Corporation:
Basic	[1]	44,433	44,031	44,275	43,986
Diluted		45,187	44,898	45,000	44,906

[1] Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding.

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Consolidated net income		$ 16,583	$ 1,795	$ 44,936	$ 17,365
Foreign currency translation losses, net of tax	[1]	(77)	(94)	(267)	(672)
Unrealized gains (losses) on available-for-sale securities, net of tax	[1]	20	1,054	(11)	671
Other comprehensive (loss) income		(57)	960	(278)	(1)
Consolidated comprehensive income		16,526	2,755	44,658	17,364
Less: Comprehensive loss attributable to noncontrolling interest		(6)	(4)	(12)	(69)
Comprehensive income attributable to Vicor Corporation		$ 16,532	$ 2,759	$ 44,670	$ 17,433

[1] The deferred tax assets associated with foreign currency translation losses and unrealized gains (losses) on available-for-sale securities are completely offset by a tax valuation allowance as of September 30, 2023 and 2022. Therefore, there is no income tax benefit (provision) recognized for the three and nine months ended September 30, 2023 and 2022.

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Recognized income tax benefit (provision)	$ 0	$ 0	$ 0	$ 0

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Consolidated net income	$ 16,583	$ 1,795	$ 44,936	$ 17,365
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization			13,202	10,250
Stock-based compensation expense	3,458	2,829	9,287	7,445
Provision for doubtful accounts			43	5
Litigation-related expense	0	6,500	0	6,500
Amortization of Bond Premium			0	1,027
Credit gain on available-for-sale securities	0	(1)	0	(3)
Increase in long-term deferred revenue			1,235	1,420
Increase in other assets			(260)	(1,451)
Deferred income taxes			(61)	(52)
Decrease in long-term income taxes payable			(14)	(40)
Change in current assets and liabilities, net			(15,374)	(20,456)
Net cash provided by operating activities			52,994	22,010
Investing activities:
Sales or maturities of short-term investments			0	25,000
Additions to property, plant and equipment and internal-use software			(26,289)	(51,279)
Net cash used for investing activities			(26,289)	(26,279)
Financing activities:
Proceeds from employee stock plans			10,503	4,147
Net cash provided by financing activities			10,503	4,147
Effect of foreign exchange rates on cash			(35)	(198)
Net increase (decrease) in cash and cash equivalents			37,173	(320)
Cash and cash equivalents at beginning of period			190,611	182,418
Cash and cash equivalents at end of period	$ 227,784	$ 182,098	$ 227,784	$ 182,098

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Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Vicor Corporation Stockholders' Equity [Member]	Noncontrolling Interest [Member]	Class B Common Stock [Member] Common Stock [Member]
Beginning Balance at Dec. 31, 2021	$ 423,905	$ 439	$ 345,664	$ 217,633	$ (1,328)	$ (138,927)	$ 423,599	$ 306	$ 118
Issuance of Common Stock under employee stock plans	4,147	1	4,146				4,147
Stock-based compensation expense	7,445		7,445				7,445
Components of comprehensive income (loss), net of tax:
Net income (loss)	17,365			17,384			17,384	(19)
Other comprehensive income (loss)	(1)				49		49	(50)
Total comprehensive income (loss)	17,364						17,433	(69)
Ending Balance at Sep. 30, 2022	452,861	440	357,255	235,017	(1,279)	(138,927)	452,624	237	118
Beginning Balance at Jun. 30, 2022	445,104	440	352,253	233,225	(2,246)	(138,927)	444,863	241	118
Issuance of Common Stock under employee stock plans	2,173		2,173				2,173
Stock-based compensation expense	2,829		2,829				2,829
Components of comprehensive income (loss), net of tax:
Net income (loss)	1,795			1,792			1,792	3
Other comprehensive income (loss)	960				967		967	(7)
Total comprehensive income (loss)	2,755						2,759	(4)
Ending Balance at Sep. 30, 2022	452,861	440	357,255	235,017	(1,279)	(138,927)	452,624	237	118
Beginning Balance at Dec. 31, 2022	464,336	441	360,365	243,079	(988)	(138,927)	464,088	248	118
Issuance of Common Stock under employee stock plans	10,503	4	10,499				10,503
Stock-based compensation expense	9,287		9,287				9,287
Components of comprehensive income (loss), net of tax:
Net income (loss)	44,936			44,927			44,927	9
Other comprehensive income (loss)	(278)				(257)		(257)	(21)
Total comprehensive income (loss)	44,658						44,670	(12)
Ending Balance at Sep. 30, 2023	528,784	445	380,151	288,006	(1,245)	(138,927)	528,548	236	118
Beginning Balance at Jun. 30, 2023	501,019	443	368,914	271,424	(1,195)	(138,927)	500,777	242	118
Issuance of Common Stock under employee stock plans	7,781	2	7,779				7,781
Stock-based compensation expense	3,458		3,458				3,458
Components of comprehensive income (loss), net of tax:
Net income (loss)	16,583			16,582			16,582	1
Other comprehensive income (loss)	(57)				(50)		(50)	(7)
Total comprehensive income (loss)	16,526						16,532	(6)
Ending Balance at Sep. 30, 2023	$ 528,784	$ 445	$ 380,151	$ 288,006	$ (1,245)	$ (138,927)	$ 528,548	$ 236	$ 118

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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 16,582	$ 1,792	$ 44,927	$ 17,384

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Insider Trading Arrangements	9 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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Basis of Presentation

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements of Vicor Corporation and its consolidated subsidiaries (collectively, the "Company") have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, these interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2023. The balance sheet at December 31, 2022 presented herein has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 filed by the Company with the SEC on February 28, 2023.

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Inventories

9 Months Ended

Sep. 30, 2023

Inventory Disclosure [Abstract]

Inventories

2. Inventories

Inventories were as follows (in thousands):

	September 30, 2023		December 31, 2022
Raw materials	$	86,710	$	82,181
Work-in-process		9,335		10,456
Finished goods		8,525		8,773
	$	104,570	$	101,410

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Long-Term Investments

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Long-Term Investments

3. Long-Term Investments

As of September 30, 2023 and December 31, 2022, the Company held one auction rate security with a par value of $3,000,000 and an estimated fair value of approximately $2,611,000 and $2,622,000, respectively, purchased through and held in custody by a broker-dealer affiliate of Bank of America, N.A., that has experienced failed auctions (the “Failed Auction Security”) since February 2008. The Failed Auction Security held by the Company is Aaa/AA+ rated by major credit rating agencies, is collateralized by student loans, and is guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program. Management is not aware of any reason to believe the issuer of the Failed Auction Security is presently at risk of default. Through September 30, 2023, the Company has continued to receive interest payments on the Failed Auction Security in accordance with the terms of its indenture. Management believes the Company ultimately should be able to liquidate the Failed Auction Security without significant loss primarily due to the overall quality of the issue held and the collateral securing the substantial majority of the underlying obligation. However, current conditions in the auction rate securities market have led management to conclude the recovery period for the Failed Auction Security exceeds 12 months. As a result, the Company continued to classify the Failed Auction Security as long-term as of September 30, 2023.

Details of our investments are as follows (in thousands):

	September 30, 2023
	Cash and Cash		Long-Term
	Equivalents		Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	187,777	$	—
Failed Auction Security		—		2,611
Total		187,777		2,611
Other measurement basis:
Cash on hand		40,007		—
Total	$	227,784	$	2,611

	December 31, 2022
	Cash and Cash		Long-Term
	Equivalents		Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	143,274	$	—
Failed Auction Security		—		2,622
Total		143,274		2,622
Other measurement basis:
Cash on hand		47,337		—
Total	$	190,611	$	2,622

The following is a summary of the available-for-sale securities (in thousands):

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
September 30, 2023	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000		—		389	$	2,611

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
December 31, 2022	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000		—		378	$	2,622

As of September 30, 2023, the Failed Auction Security had been in an unrealized loss position for greater than 12 months.

The amortized cost and estimated fair value of the available-for-sale securities on September 30, 2023, by type and contractual maturities, are shown below (in thousands):

			Estimated
	Cost		Fair Value
Failed Auction Security:
Due in twenty years	$	3,000	$	2,611

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Fair Value Measurements

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. Fair Value Measurements

The Company accounts for certain financial assets at fair value, defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions market participants would use in pricing an asset or liability. A three-level hierarchy is used to show the extent and level of judgment used to estimate fair value measurements.

Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2023 (in thousands):

	Using
			Significant
	Quoted Prices		Other		Significant
	in Active		Observable		Unobservable		Total Fair
	Markets		Inputs		Inputs		Value as of
	(Level 1)		(Level 2)		(Level 3)		September 30, 2023
Cash equivalents:
Money market funds	$	187,777	$	—	$	—	$	187,777
Long-term investment:
Failed Auction Security		—		—		2,611		2,611

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2022 (in thousands):

	Using
			Significant
	Quoted Prices		Other		Significant
	in Active		Observable		Unobservable		Total Fair
	Markets		Inputs		Inputs		Value as of
	(Level 1)		(Level 2)		(Level 3)		December 31, 2022
Cash equivalents:
Money market funds	$	143,274	$	—	$	—	$	143,274
Long-term investment:
Failed Auction Security		—		—		2,622		2,622

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2023 was as follows (in thousands):

Balance at the beginning of the period	$	2,622
Loss included in Other comprehensive income		(11	)
Balance at the end of the period	$	2,611

Management utilized a probability weighted discounted cash flow model to determine the estimated fair value as of September 30, 2023.

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Revenues

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Revenues

5. Revenues

The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands):

	Three Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
United States	$	21,279	$	18,889	$	40,168
Europe		10,392		5,808		16,200
Asia Pacific		17,024		33,623		50,647
All other		737		92		829
	$	49,432	$	58,412	$	107,844

	Nine Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
United States	$	60,764	$	48,426	$	109,190
Europe		24,893		15,869		40,762
Asia Pacific		46,998		112,686		159,684
All other		2,536		235		2,771
	$	135,191	$	177,216	$	312,407

	Three Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
United States	$	21,559	$	9,303	$	30,862
Europe		7,101		1,954		9,055
Asia Pacific		14,800		47,704		62,504
All other		456		241		697
	$	43,916	$	59,202	$	103,118

	Nine Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
United States	$	54,288	$	32,711	$	86,999
Europe		19,184		6,951		26,135
Asia Pacific		38,167		139,749		177,916
All other		2,157		379		2,536
	$	113,796	$	179,790	$	293,586

The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands):

	Three Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	27,748	$	37,384	$	65,132
Stocking distributors, net of sales allowances		21,461		9,673		31,134
Non-recurring engineering		223		6,726		6,949
Royalties		—		4,269		4,269
Other		—		360		360
	$	49,432	$	58,412	$	107,844

	Nine Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	82,669	$	134,953	$	217,622
Stocking distributors, net of sales allowances		51,536		21,070		72,606
Non-recurring engineering		986		11,650		12,636
Royalties		—		8,745		8,745
Other		—		798		798
	$	135,191	$	177,216	$	312,407

	Three Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	29,051	$	53,033	$	82,084
Stocking distributors, net of sales allowances		14,288		2,869		17,157
Non-recurring engineering		577		2,249		2,826
Royalties		—		1,033		1,033
Other		—		18		18
	$	43,916	$	59,202	$	103,118

	Nine Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	77,018	$	162,483	$	239,501
Stocking distributors, net of sales allowances		35,960		9,715		45,675
Non-recurring engineering		818		5,543		6,361
Royalties		—		1,995		1,995
Other		—		54		54
	$	113,796	$	179,790	$	293,586

The following table presents the changes in certain contract assets and (liabilities) (in thousands):

	September 30, 2023			December 31, 2022			Change
Short-term deferred revenue and customer prepayments	$	(3,618	)	$	(13,197	)	$	9,579
Long-term deferred revenue		(1,380	)		(145	)	$	(1,235	)
Deferred expenses		30			577		$	(547	)
Sales allowances		(2,553	)		(1,661	)	$	(892	)

Deferred expenses are included in Other current assets in the accompanying Condensed Consolidated Balance Sheets.

The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. The Company recognized revenue of approximately $3,711,000 and $7,486,000 for the three and nine months ended September 30, 2023, respectively, and $1,149,000 and $2,015,000 for the three and nine months ended September 30, 2022 that was included in deferred revenue at the beginning of the respective period.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

6. Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date. Stock-based compensation expense was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Cost of revenues	$	693	$	479	$	1,749	$	1,161
Selling, general and administrative		1,788		1,537		4,934		4,184
Research and development		977		813		2,604		2,100
Total stock-based compensation	$	3,458	$	2,829	$	9,287	$	7,445

Compensation expense by type of award was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Stock options	$	3,161	$	2,531	$	8,358	$	6,641
ESPP		297		298		929		804
Total stock-based compensation	$	3,458	$	2,829	$	9,287	$	7,445

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Rental Income

9 Months Ended

Sep. 30, 2023

Leases [Abstract]

Rental Income

7. Rental Income

Income, net under the Company’s operating lease agreement, for its owned facility leased to a third party in California, was approximately $198,000 for each of the three month periods ended September 30, 2023 and 2022 and $594,000 for each of the nine month periods ended September 30, 2023 and 2022.

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Income Taxes

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Income Taxes

8. Income Taxes

The provision for income taxes is based on the estimated annual effective tax rate for the year, which includes estimated federal, state and foreign income taxes on the Company’s projected pre-tax income.

The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Provision for income taxes	$	1,038		$	641		$	4,716		$	1,395
Effective income tax rate		5.9	%		26.3	%		9.5	%		7.4	%

The effective tax rates were lower than the statutory tax rates for the three and nine months ended September 30, 2023 and 2022 primarily due to the Company’s full valuation allowance position against domestic deferred tax assets. The provision for income taxes for the three and nine months ended September 30, 2023 and 2022 included estimated federal, state and foreign income taxes in jurisdictions in which the Company does not have sufficient tax attributes.

As of September 30, 2023, the Company has a valuation allowance of approximately $47,413,000 against all net domestic deferred tax assets for which realization cannot be considered more likely than not at this time. Management assesses the need for the valuation allowance on a quarterly basis. In assessing the need for a valuation allowance, the Company considers all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies, and past financial performance. Despite recent positive operating results, the Company faces uncertainties in forecasting its operating results due to supply and factory capacity constraints, certain process issues with the production of Advanced Products and the unpredictability in certain markets. This operating uncertainty also makes it difficult to predict the availability and utilization of tax

benefits over the next several years. As a result, management has concluded, as of September 30, 2023, it is more likely than not the Company’s net domestic deferred tax assets will not be realized, and a full valuation allowance against all net domestic deferred tax assets is still warranted as of September 30, 2023. The valuation allowance against these deferred tax assets may require adjustment in the future based on changes in the mix of temporary differences, changes in tax laws, and operating performance. If the positive operating results continue, and the Company’s concerns about industry uncertainty and world events, supply and factory capacity constraints, and process issues with the production of Advanced Products are resolved, and the amount of tax benefits the Company is able to utilize to the point that the Company believes future taxable income can be more reliably forecasted, the Company may release all or a portion of the valuation allowance in the near-term. If and when the Company determines the valuation allowance should be released (i.e., reduced), the adjustment would result in a tax benefit reported in that period’s Condensed Consolidated Statements of Operations, the effect of which would be an increase in reported net income.

The Company was informed in September 2021 by the Internal Revenue Service of their intention to examine the Company’s 2019 Federal income tax return. The IRS is in the process of closing examination of the 2019 tax year with no material adjustments. There are no other audits or examinations in process in any other jurisdiction.

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Net Income per Share

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Net Income per Share

9. Net Income per Share

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Numerator:
Net income attributable to Vicor Corporation	$	16,582	$	1,792	$	44,927	$	17,384
Denominator:
Denominator for basic net income per share-weighted    average shares (1)		44,433		44,031		44,275		43,986
Effect of dilutive securities:
Employee stock options (2)		754		867		725		920
Denominator for diluted net income per share – adjusted    weighted-average shares and assumed conversions		45,187		44,898		45,000		44,906
Basic net income per share	$	0.37	$	0.04	$	1.01	$	0.40
Diluted net income per share	$	0.37	$	0.04	$	1.00	$	0.39

(1)Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding.

(2)Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023, respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

10. Commitments and Contingencies

At September 30, 2023, the Company had approximately $14,416,000 of cancelable and non-cancelable capital expenditure commitments, principally for manufacturing equipment, and approximately $2,364,000 of capital expenditure items which had been received and included in Property, plant and equipment, net in the accompanying Condensed Consolidated Balance Sheets, but not yet paid for.

The Company is the defendant in a patent infringement lawsuit originally filed on January 28, 2011 by SynQor, Inc. (“SynQor”) in the U.S. District Court (the “District Court”) for the Eastern District of Texas. The complaint, as amended, alleged that the

Company’s unregulated bus converters used in intermediate bus architecture power supply systems infringed SynQor’s U.S. patent numbers 7,072,190, 7,272,021, 7,564,702, and 8,023,290 (“the ‘190 patent”, “the ‘021 patent”, “the ‘702 patent”, and “the ‘290 patent”, respectively, and collectively the “SynQor Patents”). The Company asserted counterclaims against SynQor alleging unfair competition and tortious interference with business relations (the “Counterclaims”). As a result of certain actions by the United States Patent and Trademark Office (“USPTO”) and the District Court, SynQor’s infringement allegations regarding the ‘021 patent and the ‘290 patent were dismissed from the case prior to the beginning of trial. Specifically, the USPTO invalidated all the asserted claims of the ‘021 patent and that decision was upheld on appeal on August 30, 2017. In addition, on October 5, 2022, the District Court issued an order involuntarily dismissing the ‘290 patent infringement allegations on grounds of equitable and judicial estoppel, in view of representations by SynQor to the District Court agreeing to such dismissal as a condition of lifting a prior stay of the lawsuit. On January 18, 2023, the United States Court of Appeals for the Federal Circuit issued a decision upholding a decision of the Patent Trial and Appeal Board of the USPTO invalidating all claims of the ‘290 patent.

A trial in the District Court began on October 17, 2022 on the asserted claims of the ‘190 patent and the ‘702 patent, as well as on the Company’s Counterclaims. The District Court dismissed the Company’s Counterclaims on October 25, 2022. On October 26, 2022, the jury returned a verdict on SynQor’s patent infringement claims, finding that the Company willfully infringed the ‘702 patent, but did not infringe the ‘190 patent. The jury awarded SynQor damages in the amount of $6,500,000 for infringement of the ‘702 patent. All of the SynQor Patents expired in 2018.

On December 23, 2022, SynQor filed in the District Court (a) a motion for judgment as a matter of law that the Company infringed the ‘190 patent, (b) a motion requesting the District Court to award SynQor treble damages, as well as pre- and post-judgment interest, (c) a motion requesting the District Court to award SynQor its attorneys’ fees, and (d) a motion for a new trial. On December 23, 2022, the Company filed in the District Court (a) a motion requesting judgment as a matter of law that it did not infringe the ‘702 patent, and (b) a motion requesting judgment with respect to its defenses of equitable estoppel and waiver. The Court has not yet acted on any of these motions. To the extent that the District Court ultimately rules against the Company with respect to any of the aforementioned motions, the Company anticipates appealing those rulings to the United States Court of Appeals for the Federal Circuit. The Company similarly anticipates appealing the District Court’s order dismissing the Company’s Counterclaims against SynQor.

In accordance with applicable accounting standards, the Company recorded a litigation related accrual of $6,500,000 in the third quarter of 2022 as its estimate based on the jury award, using estimated outcomes ranging from $0 to treble damages plus attorney fees.

In addition, the Company is involved in certain other litigation and claims incidental to the conduct of its business, both as a defendant and a plaintiff. While the outcome of such other lawsuits and claims against the Company cannot be predicted with certainty, management does not expect such litigation or claims will have a material adverse impact on the Company’s financial position or results of operations.

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Impact of Recently Issued Accounting Standards

9 Months Ended

Sep. 30, 2023

Accounting Changes and Error Corrections [Abstract]

Impact of Recently Issued Accounting Standards

11. Impact of Recently Issued Accounting Standards

New pronouncements issued but not effective until after September 30, 2023 are not expected to have a material impact on the Company’s consolidated financial statements.

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Inventories (Tables)

9 Months Ended

Sep. 30, 2023

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories were as follows (in thousands):

	September 30, 2023		December 31, 2022
Raw materials	$	86,710	$	82,181
Work-in-process		9,335		10,456
Finished goods		8,525		8,773
	$	104,570	$	101,410

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Long-Term Investments (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Summary of Investment

Details of our investments are as follows (in thousands):

	September 30, 2023
	Cash and Cash		Long-Term
	Equivalents		Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	187,777	$	—
Failed Auction Security		—		2,611
Total		187,777		2,611
Other measurement basis:
Cash on hand		40,007		—
Total	$	227,784	$	2,611

	December 31, 2022
	Cash and Cash		Long-Term
	Equivalents		Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	143,274	$	—
Failed Auction Security		—		2,622
Total		143,274		2,622
Other measurement basis:
Cash on hand		47,337		—
Total	$	190,611	$	2,622

Summary of Available-for-Sale Securities

The following is a summary of the available-for-sale securities (in thousands):

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
September 30, 2023	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000		—		389	$	2,611

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
December 31, 2022	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000		—		378	$	2,622

Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities

The amortized cost and estimated fair value of the available-for-sale securities on September 30, 2023, by type and contractual maturities, are shown below (in thousands):

			Estimated
	Cost		Fair Value
Failed Auction Security:
Due in twenty years	$	3,000	$	2,611

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2023 (in thousands):

	Using
			Significant
	Quoted Prices		Other		Significant
	in Active		Observable		Unobservable		Total Fair
	Markets		Inputs		Inputs		Value as of
	(Level 1)		(Level 2)		(Level 3)		September 30, 2023
Cash equivalents:
Money market funds	$	187,777	$	—	$	—	$	187,777
Long-term investment:
Failed Auction Security		—		—		2,611		2,611

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2022 (in thousands):

	Using
			Significant
	Quoted Prices		Other		Significant
	in Active		Observable		Unobservable		Total Fair
	Markets		Inputs		Inputs		Value as of
	(Level 1)		(Level 2)		(Level 3)		December 31, 2022
Cash equivalents:
Money market funds	$	143,274	$	—	$	—	$	143,274
Long-term investment:
Failed Auction Security		—		—		2,622		2,622

Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2023 was as follows (in thousands):

Balance at the beginning of the period	$	2,622
Loss included in Other comprehensive income		(11	)
Balance at the end of the period	$	2,611

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Revenues (Tables)

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Summary of Net Revenues Based On Geography Location

The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands):

	Three Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
United States	$	21,279	$	18,889	$	40,168
Europe		10,392		5,808		16,200
Asia Pacific		17,024		33,623		50,647
All other		737		92		829
	$	49,432	$	58,412	$	107,844

	Nine Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
United States	$	60,764	$	48,426	$	109,190
Europe		24,893		15,869		40,762
Asia Pacific		46,998		112,686		159,684
All other		2,536		235		2,771
	$	135,191	$	177,216	$	312,407

	Three Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
United States	$	21,559	$	9,303	$	30,862
Europe		7,101		1,954		9,055
Asia Pacific		14,800		47,704		62,504
All other		456		241		697
	$	43,916	$	59,202	$	103,118

	Nine Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
United States	$	54,288	$	32,711	$	86,999
Europe		19,184		6,951		26,135
Asia Pacific		38,167		139,749		177,916
All other		2,157		379		2,536
	$	113,796	$	179,790	$	293,586

Summary of Net Revenues Disaggregated by Geography

The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands):

	Three Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	27,748	$	37,384	$	65,132
Stocking distributors, net of sales allowances		21,461		9,673		31,134
Non-recurring engineering		223		6,726		6,949
Royalties		—		4,269		4,269
Other		—		360		360
	$	49,432	$	58,412	$	107,844

	Nine Months Ended September 30, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	82,669	$	134,953	$	217,622
Stocking distributors, net of sales allowances		51,536		21,070		72,606
Non-recurring engineering		986		11,650		12,636
Royalties		—		8,745		8,745
Other		—		798		798
	$	135,191	$	177,216	$	312,407

	Three Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	29,051	$	53,033	$	82,084
Stocking distributors, net of sales allowances		14,288		2,869		17,157
Non-recurring engineering		577		2,249		2,826
Royalties		—		1,033		1,033
Other		—		18		18
	$	43,916	$	59,202	$	103,118

	Nine Months Ended September 30, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	77,018	$	162,483	$	239,501
Stocking distributors, net of sales allowances		35,960		9,715		45,675
Non-recurring engineering		818		5,543		6,361
Royalties		—		1,995		1,995
Other		—		54		54
	$	113,796	$	179,790	$	293,586

Summary of Changes in Contract Assets And Liabilities

The following table presents the changes in certain contract assets and (liabilities) (in thousands):

	September 30, 2023			December 31, 2022			Change
Short-term deferred revenue and customer prepayments	$	(3,618	)	$	(13,197	)	$	9,579
Long-term deferred revenue		(1,380	)		(145	)	$	(1,235	)
Deferred expenses		30			577		$	(547	)
Sales allowances		(2,553	)		(1,661	)	$	(892	)

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation Expense

Stock-based compensation expense was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Cost of revenues	$	693	$	479	$	1,749	$	1,161
Selling, general and administrative		1,788		1,537		4,934		4,184
Research and development		977		813		2,604		2,100
Total stock-based compensation	$	3,458	$	2,829	$	9,287	$	7,445

Summary of Compensation Expenses by Type of Award

Compensation expense by type of award was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Stock options	$	3,161	$	2,531	$	8,358	$	6,641
ESPP		297		298		929		804
Total stock-based compensation	$	3,458	$	2,829	$	9,287	$	7,445

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Provision for Income Taxes and Effective Income Tax Rates

The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Provision for income taxes	$	1,038		$	641		$	4,716		$	1,395
Effective income tax rate		5.9	%		26.3	%		9.5	%		7.4	%

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Net Income per Share (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Numerator:
Net income attributable to Vicor Corporation	$	16,582	$	1,792	$	44,927	$	17,384
Denominator:
Denominator for basic net income per share-weighted    average shares (1)		44,433		44,031		44,275		43,986
Effect of dilutive securities:
Employee stock options (2)		754		867		725		920
Denominator for diluted net income per share – adjusted    weighted-average shares and assumed conversions		45,187		44,898		45,000		44,906
Basic net income per share	$	0.37	$	0.04	$	1.01	$	0.40
Diluted net income per share	$	0.37	$	0.04	$	1.00	$	0.39

(1)Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding.

(2)Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023, respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 86,710	$ 82,181
Work-in-process	9,335	10,456
Finished goods	8,525	8,773
Net balance	$ 104,570	$ 101,410

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Long-Term Investments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Minimum period for which failed auction securities been in unrealized loss position	12 months
Failed Auction Security [Member]
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Amortized cost of securities	$ 3,000,000	$ 3,000,000
Period for which failed auction securities been in unrealized loss position	exceeds 12 months
Estimated Fair Value	$ 2,611,000	$ 2,622,000

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Long-Term Investments - Summary of Investment (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	$ 227,784	$ 190,611
Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Auction Rate Securities [Member] | Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	187,777	143,274
Estimate of Fair Value Measurement [Member] | Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Estimate of Fair Value Measurement [Member] | Auction Rate Securities [Member] | Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Estimate of Fair Value Measurement [Member] | Money market funds [Member] | Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	187,777	143,274
Portion at Other than Fair Value Measurement [Member] | Cash [Member] | Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	$ 40,007	$ 47,337

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Long-Term Investments - Summary of Available-for-Sale Securities (Detail) - Failed Auction Security [Member] - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Cost	$ 3,000,000	$ 3,000,000
Gross Unrealized Losses	389,000	378,000
Estimated Fair Value	$ 2,611,000	$ 2,622,000

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Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) - Failed Auction Security [Member] $ in Thousands	Sep. 30, 2023 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Due in twenty to forty years, Cost	$ 3,000
Due in twenty to forty years, Estimated Fair Value	$ 2,611

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Other Long-Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,611	$ 2,622
Failed Auction Security [Member] | Other Long-Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,611	2,622
Money market funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	187,777	143,274
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	187,777	143,274
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Failed Auction Security [Member] | Other Long-Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,611	$ 2,622

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Fair Value Measurements - Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 2,622
Loss included in Other comprehensive income	(11)
Balance at the end of the period	$ 2,611

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Revenues - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 107,844	$ 103,118	$ 312,407	$ 293,586
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	49,432	43,916	135,191	113,796
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	58,412	59,202	177,216	179,790
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,168	30,862	109,190	86,999
United States [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	21,279	21,559	60,764	54,288
United States [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	18,889	9,303	48,426	32,711
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,200	9,055	40,762	26,135
Europe [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,392	7,101	24,893	19,184
Europe [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,808	1,954	15,869	6,951
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	50,647	62,504	159,684	177,916
Asia Pacific [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,024	14,800	46,998	38,167
Asia Pacific [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	33,623	47,704	112,686	139,749
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	829	697	2,771	2,536
All Other [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	737	456	2,536	2,157
All Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 92	$ 241	$ 235	$ 379

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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 107,844	$ 103,118	$ 312,407	$ 293,586
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	49,432	43,916	135,191	113,796
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	58,412	59,202	177,216	179,790
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	65,132	82,084	217,622	239,501
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	27,748	29,051	82,669	77,018
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	37,384	53,033	134,953	162,483
Stocking distributors, net of sales allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	31,134	17,157	72,606	45,675
Stocking distributors, net of sales allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	21,461	14,288	51,536	35,960
Stocking distributors, net of sales allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,673	2,869	21,070	9,715
Non-recurring engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,949	2,826	12,636	6,361
Non-recurring engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	223	577	986	818
Non-recurring engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,726	2,249	11,650	5,543
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,269	1,033	8,745	1,995
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,269	1,033	8,745	1,995
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	360	18	798	54
Other [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 360	$ 18	$ 798	$ 54

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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Short-term deferred revenue and customer prepayments	$ (3,618)	$ (13,197)
Long-term deferred revenue	(1,380)	(145)
Deferred expenses	30	577
Sales allowances	(2,553)	$ (1,661)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Short-term deferred revenue and customer prepayments	9,579
Long-term deferred revenue	(1,235)
Deferred expenses	(547)
Sales allowances	$ (892)

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Revenues - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Deferred Revenue, Revenue Recognized	$ 3,711,000	$ 1,149,000	$ 7,486,000	$ 2,015,000

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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 3,458	$ 2,829	$ 9,287	$ 7,445
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	693	479	1,749	1,161
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,788	1,537	4,934	4,184
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 977	$ 813	$ 2,604	$ 2,100

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Stock-Based Compensation - Summary of Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 3,458	$ 2,829	$ 9,287	$ 7,445
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	3,161	2,531	8,358	6,641
ESPP [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 297	$ 298	$ 929	$ 804

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Rental Income - Additional information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Lease income	$ 198,000	$ 198,000	$ 594,000	$ 594,000

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Income Taxes - Additional Information (Detail)	Sep. 30, 2023 USD ($)
Income Tax Disclosure [Abstract]
Valuation allowance, deferred tax assets	$ 47,413,000

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Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 1,038	$ 641	$ 4,716	$ 1,395
Effective income tax rate	5.90%	26.30%	9.50%	7.40%

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Net Income per Share - Summary of Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income attributable to Vicor Corporation		$ 16,582	$ 1,792	$ 44,927	$ 17,384
Denominator:
Denominator for basic net income per share-weighted average shares	[1]	44,433	44,031	44,275	43,986
Effect of dilutive securities:
Employee stock options	[2]	754	867	725	920
Denominator for diluted net income per share - adjusted weighted-average shares and assumed conversions		45,187	44,898	45,000	44,906
Basic net income per share		$ 0.37	$ 0.04	$ 1.01	$ 0.4
Diluted net income per share		$ 0.37	$ 0.04	$ 1	$ 0.39

[1] Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding.

[2] Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023, respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

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Net Income per Share - Summary of Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share	1,012,045	1,037,640	1,473,749	772,240

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Commitments and Contingencies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Capital expenditure commitments	$ 14,416,000
Capital expenditures incurred but not yet paid	2,364,000
Litigation related accrual amount	6,500,000
Estimated outcomes amount	0
Infringement of 702 Patent [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 6,500,000