Comparable stake leader
Patrizio Vinciarelli
SEC ownership of VICOR CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000751978.
Disclosed value leader
Patrizio Vinciarelli
Comparable rows
4/50
Latest evidence
02 Oct 2026
- Public ticker
- VICR on Nasdaq
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Patrizio Vinciarelli
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
4 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Patrizio Vinciarelli
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
02 Oct 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000751978
- Issuer location
- Andover, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of VICOR CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Patrizio Vinciarelli
Disclosed value leader
Patrizio Vinciarelli
Comparable rows
4/50
Latest evidence
02 Oct 2026
3/4/5
13D/G
13F
Lead comparable stake: 47%
46 rows are not safely comparable across share classes.
13D/G row: Patrizio Vinciarelli
Showing 1-8 of 50 holder rows.
Quick read
Patrizio Vinciarelli leads the comparable SEC ownership view at 47%.
4 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Patrizio Vinciarelli's linked filing trail.
Comparable ownership
Top 4
Patrizio Vinciarelli
47%
PRICE T ROWE ASSOCIATES INC /MD/
13%
BlackRock, Inc.
6.7%
JPMORGAN CHASE & CO
4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Patrizio Vinciarelli |
3/4/5
13D/G
Chairman & CEO, Director, 10%+ Owner
|
47%
Reported 13D/G
· 31 Dec 2024
|
$2,666,334,690
8,476,245 shares
mixed-class rows
|
-$346,570,416 | 02 Oct 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
T. Rowe Price Associates, Inc. · Company
|
13%
Reported 13D/G
· 31 Aug 2026
|
$960,639,949
4,384,882 shares
|
+$441,765,400 | 31 Aug 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
6.7%
Reported 13D/G
· 30 Jun 2026
|
$934,611,613
2,460,929 shares
|
— | 30 Jun 2026 |
| JPMORGAN CHASE & CO |
13F
13D/G
Company
|
4%
Reported 13D/G
· 31 Aug 2026
|
$869,793,227
2,370,220 shares
|
— | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$486,173,848
1,280,146 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$425,557,922
1,120,538 shares
|
— | 30 Jun 2026 |
| STATE STREET CORP |
13F
Company
|
—
denominator unverified
|
$275,728,255
726,021 shares
|
— | 30 Jun 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
—
denominator unverified
|
$223,103,218
587,338 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$413,012,288.
Buys
$0
Insiders: 0
Sells
$413,012,288
Insiders: 18
Net
-$413,012,288
Shares: -1,848,677
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,848,677
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 52,199 | $0 | $15,356,629 | -$15,356,629 |
| 3-6 | 0 | 594,957 | $0 | $189,769,249 | -$189,769,249 |
| 6-9 | 0 | 1,019,890 | $0 | $188,744,534 | -$188,744,534 |
| 9-12 | 0 | 181,631 | $0 | $19,141,876 | -$19,141,876 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 20 reporting-owner rows connected to VICOR CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
20
Largest Forms 3/4/5 holder
Patrizio Vinciarelli
Net 12M change
-$413.01M
Full value: -$413,012,289 · USD · 12-month changeLatest report
03 Nov 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Patrizio Vinciarelli | Chairman & CEO, Director, 10%+ Owner | $2,666,334,690 | -$346,570,416 | -12% | Mixed | 02 Oct 2026 |
| Estia J. Eichten | Director | $39,810,438 | -$6,841,102 | -15% | Mixed | 24 Jul 2026 |
| Michael McNamara | Corp. VP-General Mrg. Ops., Director | $2,927,785 | -$7,545,434 | -72% | Mixed | 22 Jun 2026 |
| Samuel J. Anderson | Director | $2,826,702 | -$1,173,569 | -29% | Mixed | 20 Aug 2026 |
| Alex Gusinov | Corp. VP -Engineering | $2,618,952 | -$1,628,650 | -38% | Median | 03 Nov 2026 |
| Claudio Tuozzolo | Corp. Vice President, Director | $2,131,640 | -$11,874,081 | -85% | Mixed | 22 Jun 2026 |
| Sean Crilly | Corp. VP-Eng., Pwr Syst. | $2,042,317 | -$2,188,417 | -52% | Filing P/S | 05 Jun 2026 |
| Philip D. Davies | Corp. VP-Global Sales & Mktg., Director | $368,774 | -$7,173,205 | -95% | Filing P/S | 02 Nov 2026 |
| Alvaro Doyle | VP and CIO | $12,050 | -$4,606,262 | -100% | Filing P/S | 12 May 2026 |
| Robert Gendron | Corp. VP - Marketing | $0 | -$2,013,586 | -100% | Mixed | 26 May 2026 |
| Jason Carlson | Director | $0 | -$985,797 | -100% | Mixed | 22 Jun 2026 |
| Andrew D'Amico | Director | $0 | -$4,503,712 | -100% | Mixed | 25 Jun 2026 |
| James F. Schmidt | CFO, Treasurer, Secretary, Director | $0 | -$7,787,472 | -100% | Mixed | 25 Jun 2026 |
| Quentin A. Fendelet | Corp. VP - CAO | $0 | -$3,730,730 | -100% | Mixed | 11 May 2026 |
| Zheng John Shen | Director | $0 | -$690,817 | -100% | Mixed | 22 Jun 2026 |
| Kemble D. Morrison | VP-Corporate Controller | $0 | -$1,160,742 | -100% | Mixed | 11 May 2026 |
| Nancy L. Grava | VP Human Resources | $0 | -$2,038,037 | -100% | Mixed | 27 May 2026 |
| Zmira Lavie | Director | $0 | -$500,260 | -100% | Mixed | 17 Aug 2026 |
| Michael Ansour | Director | Mixed | 21 Jun 2024 | |||
| Richard J. Nagel Jr. | Corp. VP-CAO | Mixed | 02 Mar 2022 |
Recent insider transactions for VICOR CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Alex Gusinov | VICR | Common Stock | Options Exercise | 51.3% | 3,075 | 9,064 | 03 Nov 2026 | Direct | ||
| Alex Gusinov | VICR | Non Qualified Stock Option | Options Exercise | -87.4% | -3,075 | 444 | 03 Nov 2026 | Direct | ||
| Philip D. Davies | VICR | Common Stock | Sale | -61.6% | -$563,165 | $183.26 | -3,073 | 1,920 | 02 Nov 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Options Exercise | 160% | 3,073 | 4,993 | 02 Nov 2026 | Direct | ||
| Philip D. Davies | VICR | Non Qualified Stock Option | Options Exercise | -8.62% | -3,073 | 32,573 | 02 Nov 2026 | Direct | ||
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$6,202,343 | $310.12 | -20,000 | 8,307,390 | 02 Oct 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Sale | -61.5% | -$971,882 | $316.37 | -3,072 | 1,920 | 01 Oct 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Options Exercise | 160% | 3,072 | 4,992 | 01 Oct 2026 | Direct | ||
| Philip D. Davies | VICR | Non Qualified Stock Option | Options Exercise | -28.6% | -3,072 | 7,678 | 01 Oct 2026 | Direct | ||
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$6,322,515 | $316.13 | -20,000 | 8,327,390 | 01 Oct 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Sale | -61.6% | -$546,084 | $177.70 | -3,073 | 1,920 | 01 Sep 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Options Exercise | 160% | 3,073 | 4,993 | 01 Sep 2026 | Direct | ||
| Philip D. Davies | VICR | Non Qualified Stock Option | Options Exercise | -78.2% | -3,073 | 856 | 01 Sep 2026 | Direct | ||
| Samuel J. Anderson | VICR | Common Stock | Options Exercise | 84.5% | 3,409 | 7,443 | 20 Aug 2026 | Direct | ||
| Samuel J. Anderson | VICR | Non Qualified Stock Option | Options Exercise | -100% | -3,409 | 0 | 20 Aug 2026 | Direct | ||
| Zmira Lavie | VICR | Common Stock | Sale | -100% | -$227,000 | $250.00 | -908 | 0 | 17 Aug 2026 | Direct |
| Zmira Lavie | VICR | Common Stock | Options Exercise | 908 | 908 | 17 Aug 2026 | Direct | |||
| Zmira Lavie | VICR | Non Qualified Stock Option | Options Exercise | -20% | -908 | 3,631 | 17 Aug 2026 | Direct | ||
| Samuel J. Anderson | VICR | Common Stock | Sale | -33.9% | -$523,640 | $252.60 | -2,073 | 4,034 | 17 Aug 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Sale | -61.5% | -$650,308 | $211.69 | -3,072 | 1,920 | 03 Aug 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Options Exercise | 160% | 3,072 | 4,992 | 03 Aug 2026 | Direct | ||
| Philip D. Davies | VICR | Non Qualified Stock Option | Options Exercise | -20.9% | -3,072 | 11,607 | 03 Aug 2026 | Direct | ||
| Estia J. Eichten | VICR | Common Stock | Options Exercise | 6.06% | 5,987 | 104,825 | 24 Jul 2026 | Direct | ||
| Estia J. Eichten | VICR | Non Qualified Stock Option | Options Exercise | -100% | -5,987 | 0 | 24 Jul 2026 | Direct | ||
| Zmira Lavie | VICR | Common Stock | Sale | -100% | -$273,260 | $224.72 | -1,216 | 0 | 23 Jul 2026 | Direct |
| Zmira Lavie | VICR | Common Stock | Options Exercise | 1,216 | 1,216 | 23 Jul 2026 | Direct | |||
| Zmira Lavie | VICR | Non Qualified Stock Option | Options Exercise | -25% | -1,216 | 3,648 | 23 Jul 2026 | Direct | ||
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.01% | -$211,681 | $302.40 | -700 | 8,347,390 | 06 Jul 2026 | Direct |
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$6,377,606 | $318.88 | -20,000 | 8,348,090 | 02 Jul 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Sale | -61.6% | -$1,096,968 | $356.97 | -3,073 | 1,920 | 01 Jul 2026 | Direct |
| Philip D. Davies | VICR | Common Stock | Options Exercise | 160% | 3,073 | 4,993 | 01 Jul 2026 | Direct | ||
| Philip D. Davies | VICR | Non Qualified Stock Option | Options Exercise | -100% | -3,073 | 0 | 01 Jul 2026 | Direct | ||
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$7,133,640 | $356.68 | -20,000 | 8,368,090 | 01 Jul 2026 | Direct |
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$7,500,832 | $375.04 | -20,000 | 8,388,090 | 30 Jun 2026 | Direct |
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.1% | -$3,214,709 | $366.98 | -8,760 | 8,408,090 | 29 Jun 2026 | Direct |
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.13% | -$3,878,212 | $345.04 | -11,240 | 8,416,850 | 29 Jun 2026 | Direct |
| Andrew D'Amico | VICR | Common Stock | Sale | -100% | -$105,764 | $319.53 | -331 | 0 | 26 Jun 2026 | Direct |
| Andrew D'Amico | VICR | Common Stock | Options Exercise | 331 | 331 | 26 Jun 2026 | Direct | |||
| Andrew D'Amico | VICR | Non Qualified Stock Option | Options Exercise | -50% | -331 | 331 | 26 Jun 2026 | Direct | ||
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$6,461,085 | $323.05 | -20,000 | 8,428,090 | 26 Jun 2026 | Direct |
| James F. Schmidt | VICR | Common Stock | Sale | -100% | -$331,681 | $331.68 | -1,000 | 0 | 25 Jun 2026 | Direct |
| James F. Schmidt | VICR | Common Stock | Options Exercise | 1,000 | 1,000 | 25 Jun 2026 | Direct | |||
| James F. Schmidt | VICR | Non Qualified Stock Option | Options Exercise | -100% | -1,000 | 0 | 25 Jun 2026 | Direct | ||
| Andrew D'Amico | VICR | Common Stock | Sale | -100% | -$67,364 | $336.82 | -200 | 0 | 25 Jun 2026 | Direct |
| Andrew D'Amico | VICR | Common Stock | Options Exercise | 200 | 200 | 25 Jun 2026 | Direct | |||
| Andrew D'Amico | VICR | Non Qualified Stock Option | Options Exercise | -100% | -200 | 0 | 25 Jun 2026 | Direct | ||
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$6,611,104 | $330.56 | -20,000 | 8,448,090 | 25 Jun 2026 | Direct |
| Patrizio Vinciarelli | VICR | Common Stock | Sale | -0.24% | -$6,528,725 | $326.44 | -20,000 | 8,468,090 | 24 Jun 2026 | Direct |
| James F. Schmidt | VICR | Common Stock | Sale | -100% | -$110,852 | $334.90 | -331 | 0 | 24 Jun 2026 | Direct |
| James F. Schmidt | VICR | Common Stock | Options Exercise | 331 | 331 | 24 Jun 2026 | Direct |
* marks a reported price that did not pass the local price check.