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
50/50
Latest evidence
04 Jun 2026
- Public ticker
- VICR on Nasdaq
- Parsed ownership sources
- 3/4/5, 13D/G, and 13F
- Largest SEC-reported holder
- Patrizio Vinciarelli
- Latest 13D/G holder
- Patrizio Vinciarelli
- Latest parsed ownership date
- 04 Jun 2026
- Issuer CIK
- 0000751978
- Issuer location
- Andover, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 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
50/50
Latest evidence
04 Jun 2026
3/4/5
13D/G
13F
Lead comparable stake: 47%
13D/G row: Patrizio Vinciarelli
Showing 1-8 of 50 holder rows.
Quick read
Patrizio Vinciarelli leads the comparable SEC ownership view at 47%.
50 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 5
Patrizio Vinciarelli
47%
BlackRock, Inc.
7.9%
PRICE T ROWE ASSOCIATES INC /MD/
5.6%
JPMORGAN CHASE & CO
4.5%
Estia J. Eichten
0.29%
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 and CEO, Director, 10%+ Owner
|
47%
from 13D/G
|
$2,813,044,374
8,896,945 shares
mixed-class rows
|
-$211,974,951 | 04 Jun 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
7.9%
from 13D/G
|
$464,384,375
2,884,375 shares
|
— | 31 Mar 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
T. Rowe Price Associates, Inc. · Company
|
5.6%
|
$349,211,434
1,888,446 shares
|
$0 | 31 Mar 2026 |
| JPMORGAN CHASE & CO |
13D/G
13F
Company
|
4.5%
|
$487,275,277
1,556,989 shares
|
-$172,046,317 | 29 May 2026 |
| Estia J. Eichten |
3/4/5
Director
|
0.29%
|
$15,912,918
98,838 shares
|
-$7,347,844 | 04 Jun 2026 |
| Michael McNamara |
3/4/5
General Manager Mfg. Ops., Director
|
0.05%
|
$5,619,165
18,185 shares
|
-$7,545,434 | 11 May 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
3.4%
|
$187,103,574
1,162,134 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
3%
|
$166,593,140
1,034,740 shares
|
— | 31 Mar 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: -$282,533,253.
Buys
$0
Insiders: 0
Sells
$282,533,253
Insiders: 18
Net
-$282,533,253
Shares: -1,537,122
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,537,122
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 1,011,124 | $0 | $213,136,526 | -$213,136,526 |
| 3-6 | 0 | 360,096 | $0 | $54,577,606 | -$54,577,606 |
| 6-9 | 0 | 160,089 | $0 | $14,452,903 | -$14,452,903 |
| 9-12 | 0 | 5,813 | $0 | $366,219 | -$366,219 |
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
-$282,533,253
Latest report
04 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Patrizio Vinciarelli | Chairman and CEO, Director, 10%+ Owner | $2,813,044,374 | -$211,974,951 | -7% | Mixed | 04 Jun 2026 |
| Estia J. Eichten | Director | $15,912,918 | -$7,347,844 | -32% | Median | 04 Jun 2026 |
| Michael McNamara | General Manager Mfg. Ops., Director | $5,619,165 | -$7,545,434 | -57% | Filing P/S | 11 May 2026 |
| Claudio Tuozzolo | Corp. Vice President, Director | $4,348,188 | -$13,503,759 | -76% | Filing P/S | 26 May 2026 |
| Alex Gusinov | Corp. Vice President Eng. | $1,796,700 | -$1,989,356 | -53% | Filing P/S | 13 May 2026 |
| Sean Crilly | Corp. VP-Eng., Pwr Syst | $1,566,369 | -$2,557,459 | -62% | Median | 05 May 2026 |
| Samuel J. Anderson | Director | $1,046,984 | -$649,929 | -38% | Filing P/S | 23 Feb 2026 |
| Philip D. Davies | VP Global Sales & Marketing, Director | $632,678 | -$4,796,126 | -88% | Filing P/S | 01 Jun 2026 |
| Alvaro Doyle | VP and CIO | $12,050 | -$5,298,544 | -100% | Filing P/S | 12 May 2026 |
| Robert Gendron | Corp. VP - Marketing | $0 | -$2,575,716 | -100% | Mixed | 26 May 2026 |
| James F. Schmidt | CFO, Treasurer, Secretary, Director | $0 | -$7,523,733 | -100% | Mixed | 01 Jun 2026 |
| Nancy L. Grava | VP Human Resources | $0 | -$2,677,962 | -100% | Mixed | 27 May 2026 |
| Kemble D. Morrison | VP-Corporate Controller | $0 | -$1,353,724 | -100% | Mixed | 11 May 2026 |
| Andrew D'Amico | Director | $0 | -$5,535,710 | -100% | Mixed | 26 May 2026 |
| Zmira Lavie | Director | $0 | -$333,238 | -100% | Mixed | 28 Oct 2025 |
| Quentin A. Fendelet | Corp. VP - CAO | $0 | -$5,193,154 | -100% | Mixed | 11 May 2026 |
| Zheng John Shen | Director | $0 | -$690,817 | -100% | Mixed | 04 Mar 2026 |
| Jason Carlson | Director | $0 | -$985,797 | -100% | Mixed | 06 May 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Estia J. Eichten | vicr | Common Stock | Gift | -47.7% | -90,000 | 98,838 | 04 Jun 2026 | Direct | ||
| Patrizio Vinciarelli | vicr | Common Stock | Sale | -0.23% | $6,237,098 | $311.85 | -20,000 | 8,728,090 | 04 Jun 2026 | Direct |
| Patrizio Vinciarelli | vicr | Common Stock | Sale | -0.23% | $6,603,842 | $330.19 | -20,000 | 8,748,090 | 03 Jun 2026 | Direct |
| Patrizio Vinciarelli | vicr | Common Stock | Sale | -0.23% | $6,541,526 | $327.08 | -20,000 | 8,768,090 | 02 Jun 2026 | Direct |
| Patrizio Vinciarelli | vicr | Common Stock | Sale | -0.23% | $6,437,096 | $321.85 | -20,000 | 8,788,090 | 01 Jun 2026 | Direct |
| James F. Schmidt | vicr | Common Stock | Sale | -100% | $1,609,125 | $321.83 | -5,000 | 0 | 01 Jun 2026 | Direct |
| James F. Schmidt | vicr | Common Stock | Options Exercise | 5,000 | 5,000 | 01 Jun 2026 | Direct | |||
| James F. Schmidt | vicr | Non Qualified Stock Option | Options Exercise | -100% | -5,000 | 0 | 01 Jun 2026 | Direct | ||
| Philip D. Davies | vicr | Common Stock | Sale | -61.5% | $988,240 | $321.69 | -3,072 | 1,920 | 01 Jun 2026 | Direct |
| Philip D. Davies | vicr | Common Stock | Options Exercise | 160% | 3,072 | 4,992 | 01 Jun 2026 | Direct | ||
| Philip D. Davies | vicr | Non Qualified Stock Option | Options Exercise | -56.2% | -3,072 | 2,394 | 01 Jun 2026 | Direct | ||
| Patrizio Vinciarelli | vicr | Common Stock | Sale | -0.23% | $6,557,429 | $327.87 | -20,000 | 8,808,090 | 29 May 2026 | Direct |
| Patrizio Vinciarelli | vicr | Common Stock | Sale | -0.23% | $6,842,041 | $342.10 | -20,000 | 8,828,090 | 28 May 2026 | Direct |
| Nancy L. Grava | vicr | Common Stock | Sale | -100% | $114,665 | $355.00 | -323 | 0 | 27 May 2026 | Direct |
| Nancy L. Grava | vicr | Common Stock | Options Exercise | 323 | 323 | 27 May 2026 | Direct | |||
| Nancy L. Grava | vicr | Non Qualified Stock Option | Options Exercise | -100% | -323 | 0 | 27 May 2026 | Direct | ||
| Claudio Tuozzolo | vicr | Common Stock | Sale | -18.5% | $985,239 | $328.41 | -3,000 | 13,240 | 26 May 2026 | Direct |
| Claudio Tuozzolo | vicr | Common Stock | Options Exercise | 22.7% | 3,000 | 16,240 | 26 May 2026 | Direct | ||
| Claudio Tuozzolo | vicr | Non Qualified Stock Option | Options Exercise | -10% | -3,000 | 26,913 | 26 May 2026 | Direct | ||
| Robert Gendron | vicr | Common Stock | Sale | -100% | $1,508,430 | $330.00 | -4,571 | 0 | 26 May 2026 | Direct |
| Robert Gendron | vicr | Common Stock | Options Exercise | 4,571 | 1,184 | 26 May 2026 | Direct | |||
| Robert Gendron | vicr | Non Qualified Stock Option | Options Exercise | -100% | -4,571 | 0 | 26 May 2026 | Direct | ||
| Andrew D'Amico | vicr | Common Stock | Sale | -100% | $162,562 | $322.54 | -504 | 0 | 26 May 2026 | Direct |
| Andrew D'Amico | vicr | Common Stock | Options Exercise | 504 | 504 | 26 May 2026 | Direct | |||
| Andrew D'Amico | vicr | Non Qualified Stock Option | Options Exercise | -4.79% | -504 | 10,016 | 26 May 2026 | Direct | ||
| Andrew D'Amico | vicr | Common Stock | Sale | -100% | $252,277 | $315.35 | -800 | 0 | 14 May 2026 | Direct |
| Andrew D'Amico | vicr | Common Stock | Options Exercise | 800 | 800 | 14 May 2026 | Direct | |||
| Andrew D'Amico | vicr | Non Qualified Stock Option | Options Exercise | -7.07% | -800 | 10,520 | 14 May 2026 | Direct | ||
| Alex Gusinov | vicr | Common Stock | Sale | -20% | $450,600 | $300.00 | -1,502 | 5,989 | 13 May 2026 | Direct |
| Andrew D'Amico | vicr | Common Stock | Sale | -100% | $374,774 | $312.31 | -1,200 | 0 | 13 May 2026 | Direct |
| Andrew D'Amico | vicr | Common Stock | Options Exercise | 1,200 | 1,200 | 13 May 2026 | Direct | |||
| Andrew D'Amico | vicr | Non Qualified Stock Option | Options Exercise | -9.58% | -1,200 | 11,320 | 13 May 2026 | Direct | ||
| Patrizio Vinciarelli | vicr | Common Stock | Gift | -0.08% | -7,000 | 8,848,090 | 13 May 2026 | Direct | ||
| Alvaro Doyle | vicr | Common Stock | Sale | -99% | $1,159,404 | $286.91 | -4,041 | 42 | 12 May 2026 | Direct |
| Alvaro Doyle | vicr | Common Stock | Options Exercise | 4,041 | 2,508 | 12 May 2026 | Direct | |||
| Alvaro Doyle | vicr | Non Qualified Stock Option | Options Exercise | -45% | -4,041 | 4,932 | 12 May 2026 | Direct | ||
| Andrew D'Amico | vicr | Common Stock | Sale | -100% | $171,212 | $303.03 | -565 | 0 | 12 May 2026 | Direct |
| Andrew D'Amico | vicr | Common Stock | Options Exercise | 565 | 565 | 12 May 2026 | Direct | |||
| Andrew D'Amico | vicr | Non Qualified Stock Option | Options Exercise | -100% | -565 | 0 | 12 May 2026 | Direct | ||
| Claudio Tuozzolo | vicr | Common Stock | Sale | -40.4% | $2,737,009 | $304.65 | -8,984 | 13,240 | 11 May 2026 | Direct |
| Claudio Tuozzolo | vicr | Common Stock | Options Exercise | 101% | 8,984 | 17,878 | 11 May 2026 | Direct | ||
| Claudio Tuozzolo | vicr | Non Qualified Stock Option | Options Exercise | -29.6% | -8,984 | 21,381 | 11 May 2026 | Direct | ||
| Kemble D. Morrison | VICR | Common Stock | Sale | -100% | $697,569 | $301.59 | -2,313 | 0 | 11 May 2026 | Direct |
| Kemble D. Morrison | VICR | Common Stock | Options Exercise | 2,313 | 2,313 | 11 May 2026 | Direct | |||
| Kemble D. Morrison | VICR | Non Qualified Stock Option | Options Exercise | -86.2% | -2,313 | 372 | 11 May 2026 | Direct | ||
| Michael McNamara | vicr | Common Stock | Sale | -50.6% | $5,752,962 | $309.00 | -18,618 | 18,185 | 11 May 2026 | Direct |
| Michael McNamara | vicr | Common Stock | Options Exercise | 194.6% | 18,618 | 28,185 | 11 May 2026 | Direct | ||
| Michael McNamara | vicr | Non Qualified Stock Option | Options Exercise | -100% | -18,618 | 0 | 11 May 2026 | Direct | ||
| Quentin A. Fendelet | VICR | Common Stock | Sale | -100% | $1,502,677 | $297.03 | -5,059 | 0 | 11 May 2026 | Direct |
| Quentin A. Fendelet | VICR | Common Stock | Options Exercise | 5,059 | 5,059 | 11 May 2026 | Direct |
* marks a reported price that did not pass the local price check.