SEC Form 4 · accession 0000901484-26-000018

VICOR CORP · VICR

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Patrizio Vinciarelli

Officer — Chairman and CEO · Director · 10% Owner

Period of report

Jun 5, 2026

Accepted (ET)

Jun 8, 2026 · 3:04 pm EDT

Rule 10b5-1 plan

yes — trade under a plan

Issuer CIK

0000751978

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F3	Jun 5, 2026	S	1,000	$266.282	D	8,727,090	D
Common Stock^F4	Jun 5, 2026	S	800	$267.3775	D	8,726,290	D
Common Stock^F5	Jun 5, 2026	S	900	$268.4295	D	8,725,390	D
Common Stock^F6	Jun 5, 2026	S	800	$269.3738	D	8,724,590	D
Common Stock^F7	Jun 5, 2026	S	1,416	$270.3738	D	8,723,174	D
Common Stock^F8	Jun 5, 2026	S	1,084	$271.443	D	8,722,090	D
Common Stock^F9	Jun 5, 2026	S	1,000	$272.8797	D	8,721,090	D
Common Stock^F10	Jun 5, 2026	S	1,457	$274.1178	D	8,719,633	D
Common Stock^F11	Jun 5, 2026	S	1,343	$275.0588	D	8,718,290	D
Common Stock^F12	Jun 5, 2026	S	600	$276.3973	D	8,717,690	D
Common Stock^F13	Jun 5, 2026	S	900	$277.46	D	8,716,790	D
Common Stock^F14	Jun 5, 2026	S	1,300	$278.6729	D	8,715,490	D
Common Stock^F15	Jun 5, 2026	S	945	$280.219	D	8,714,545	D
Common Stock^F16	Jun 5, 2026	S	2,255	$281.3249	D	8,712,290	D
Common Stock^F17	Jun 5, 2026	S	1,000	$282.40	D	8,711,290	D
Common Stock^F18	Jun 5, 2026	S	915	$283.7548	D	8,710,375	D
Common Stock^F19	Jun 5, 2026	S	957	$284.7206	D	8,709,418	D
Common Stock^F20	Jun 5, 2026	S	347	$285.638	D	8,709,071	D
Common Stock^F21	Jun 5, 2026	S	892	$286.6161	D	8,708,179	D
Common Stock^F22	Jun 5, 2026	S	83	$287.6182	D	8,708,096	D
Common Stock^F23	Jun 5, 2026	S	6	$288.5067	D	8,708,090	D
Common Stock^F1	holding	—	—		—	167,125	I	See footnote

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1These shares are held by the reporting person as Trustee of the Patrizio Vinciarelli Irrevocable Trust U/A Dated 12/21/2012, established for the benefit of the child of the reporting person.
F10The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $273.6900 to $274.6700.
F11The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $274.7500 to $275.2900.
F12The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $276.0000 to $276.8800.
F13The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $277.0100 to $278.0000.
F14The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $278.1900 to $279.1700.
F15The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $279.9700 to $280.9300.
F16The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $280.9900 to $281.6800.
F17The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $282.0600 to $282.9100.
F18The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $283.1600 to $284.0000.
F19The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $284.2000 to $285.1600.
F2This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026.
F20The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $285.2000 to $286.1200.
F21The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $286.3800 to $287.3700.
F22The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $287.4200 to $288.0000.
F23The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $288.5000 to $288.5100.
F3The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $265.8900 to $266.7000. The reporting person undertakes to provide to Vicor Corporation, any security holder of Vicor Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (3) through (23) to this Form 4.
F4The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $266.9800 to $267.7200.
F5The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $268.0000 to $268.9900.
F6The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $269.0100 to $270.0000.
F7The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $270.0400 to $271.0300.
F8The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $271.0500 to $271.8300.
F9The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $272.2500 to $273.2100.