Vicor Corporation (VICR) Ownership
VICR ownership summary
as of October 18, 2026- Institutions
- 71.0% of shares outstanding
- Insiders
- 25.12% of shares outstanding
- Shares outstanding
- 34.4M
- Float
- 25.7M shares available to trade
- Short interest
- 11.52% 2.4M shares short
- Days to cover
- 2.76 short interest up 18.0% vs prior month
- Institutions 71.04%
- Insiders 25.12%
- Other investors 3.83%
VICR top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 5.34% | 2.5M | $471.3M | −423,446 (−14.7%) | June 30, 2026 |
| 2 | JPMorgan Chase & Co | 5.14% | 2.4M | $453.9M | +263,494 (+12.5%) | June 30, 2026 |
| 3 | T. Rowe Price Associates, Inc. | 5.14% | 2.4M | $453.5M | +479,920 (+25.4%) | June 30, 2026 |
| 4 | Vanguard Portfolio Management, LLC | 2.78% | 1.3M | $245.1M | +118,012 (+10.2%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 2.43% | 1.1M | $214.6M | +85,798 (+8.3%) | June 30, 2026 |
| 6 | State Street Corp | 1.57% | 726K | $139.0M | −85,596 (−10.5%) | June 30, 2026 |
| 7 | Geode Capital Management, LLC | 1.27% | 587K | $112.5M | −15,323 (−2.5%) | June 30, 2026 |
| 8 | Jane Street Group LLC | 1.17% | 539K | $103.3M | +211,454 (+64.5%) | June 30, 2026 |
| 9 | Manufacturers Life Insurance Co | 1.15% | 531K | $101.7M | −72,479 (−12.0%) | June 30, 2026 |
| 10 | Arrowstreet Capital Limited Partnership | 1.15% | 531K | $101.7M | −5,463 (−1.0%) | June 30, 2026 |
| 11 | Needham Investment Management, LLC | 1.14% | 524K | $100.3M | +2,000 (+0.4%) | June 30, 2026 |
| 12 | Driehaus Capital Management LLC | 1.08% | 497K | $95.1M | +307,044 (+162.1%) | June 30, 2026 |
| 13 | Dimensional Fund Advisors, Inc. | 1.07% | 493K | $94.5M | −355 (−0.1%) | June 30, 2026 |
| 14 | AQR Capital Management LLC | 0.97% | 450K | $86.1M | +301,220 (+203.1%) | June 30, 2026 |
| 15 | The Goldman Sachs Group Inc | 0.81% | 374K | $71.6M | −16,010 (−4.1%) | June 30, 2026 |
| 16 | Amvescap Plc. | 0.53% | 245K | $47.0M | +118,868 (+94.0%) | June 30, 2026 |
| 17 | Morgan Stanley - Brokerage Accounts | 0.50% | 231K | $44.2M | −76,121 (−24.8%) | June 30, 2026 |
| 18 | Acadian Asset Management LLC | 0.44% | 202K | $38.7M | +116,782 (+136.9%) | June 30, 2026 |
| 19 | Northern Trust Corp | 0.42% | 193K | $36.9M | −79,809 (−29.3%) | June 30, 2026 |
| 20 | UBS Group AG | 0.34% | 157K | $30.0M | +64,432 (+69.7%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 11 holders added 2.1M shares and 9 cut 775K.
VICR top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 1.91% | 882K | $168.9M | −312 (−0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 1.75% | 808K | $154.7M | −952 (−0.1%) | August 31, 2026 |
| 3 | Vanguard Small Cap Index | 1.26% | 580K | $111.1M | −3,726 (−0.6%) | September 30, 2026 |
| 4 | T. Rowe Price Lrg Cp Gr I | 1.11% | 510K | $97.7M | −3,075 (−0.6%) | September 30, 2026 |
| 5 | Needham Aggressive Growth Retail | 1.04% | 481K | $92.1M | +4,000 (+0.8%) | September 30, 2026 |
| 6 | T. Rowe Price New Horizons | 0.88% | 407K | $78.0M | +79,200 (+24.1%) | September 30, 2026 |
| 7 | Vanguard MStar Small Cap Growth Indx Inv | 0.70% | 323K | $61.9M | −12,340 (−3.7%) | September 30, 2026 |
| 8 | Invesco S&P MidCap Momentum ETF | 0.68% | 315K | $60.4M | — | September 30, 2026 |
| 9 | JPMorgan Mid Cap Growth I | 0.54% | 250K | $47.8M | −4,632 (−1.8%) | August 31, 2026 |
| 10 | Bridge Builder Large Cap Growth | 0.49% | 224K | $43.0M | +8,009 (+3.7%) | September 30, 2026 |
| 11 | Herald Ord | 0.48% | 220K | $42.1M | −25,000 (−10.2%) | March 31, 2026 |
| 12 | JPM US Technology A dist USD | 0.45% | 210K | $40.1M | −56,748 (−21.3%) | September 30, 2026 |
| 13 | T. Rowe Price Global Stock | 0.43% | 198K | $37.9M | +18,300 (+10.2%) | September 30, 2026 |
| 14 | Invesco S&P MidCap Quality ETF | 0.43% | 197K | $37.7M | +205 (+0.1%) | September 30, 2026 |
| 15 | JHancock Small Cap Core NAV | 0.42% | 196K | $37.5M | — | August 31, 2026 |
| 16 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.40% | 183K | $35.1M | +12,194 (+7.1%) | September 30, 2026 |
| 17 | Vanguard Explorer Inv | 0.37% | 170K | $32.6M | +114,155 (+204.1%) | June 30, 2026 |
| 18 | iShares S&P Mid-Cap 400 Growth ETF | 0.31% | 143K | $27.4M | −152 (−0.1%) | September 30, 2026 |
| 19 | iShares Russell Mid-Cap Growth ETF | 0.31% | 141K | $27.0M | −150 (−0.1%) | September 30, 2026 |
| 20 | T. Rowe Price Integrated US Sm Gr Eq | 0.29% | 135K | $25.8M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
VICR insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-16 | Patrizio Vinciarelli | Sell | $197.64 | 40,000 | $7.9M |
| 2026-04-15 | Patrizio Vinciarelli | Sell | $193.21 | 50,000 | $9.7M |
| 2026-04-14 | Patrizio Vinciarelli | Sell | $189.51 | 19,778 | $3.7M |
| 2026-04-09 | Patrizio Vinciarelli | Sell | $187.23 | 24,943 | $4.7M |
| 2026-03-25 | Patrizio Vinciarelli | Sell | $183.70 | 50,000 | $9.2M |
| 2026-03-24 | Patrizio Vinciarelli | Sell | $179.93 | 23,179 | $4.2M |
| 2026-03-20 | Patrizio Vinciarelli | Sell | $179.88 | 44,076 | $7.9M |
| 2026-03-18 | Patrizio Vinciarelli | Sell | $196.18 | 50,000 | $9.8M |
| 2026-03-17 | Michael Mcnamara | Sell | $190.07 | 7,174 | $1.4M |
| 2026-03-16 | Patrizio Vinciarelli | Sell | $184.67 | 50,000 | $9.2M |
| 2026-03-13 | Estia J Eichten | Sell | $174.00 | 2,000 | $348,000 |
| 2026-03-12 | Estia J Eichten | Sell | $168.27 | 38,587 | $6.5M |
| 2026-03-12 | Patrizio Vinciarelli | Sell | $167.46 | 50,000 | $8.4M |
| 2026-03-11 | James F Schmidt | Sell | $177.19 | 15,500 | $2.7M |
| 2026-03-10 | Patrizio Vinciarelli | Sell | $177.25 | 50,000 | $8.9M |
| 2026-03-06 | Patrizio Vinciarelli | Sell | $166.30 | 50,000 | $8.3M |
| 2026-03-05 | Philip D Davies | Sell | $189.67 | 5,419 | $1.0M |
| 2026-03-05 | Sean Crilly | Sell | $180.32 | 1,640 | $295,725 |
| 2026-03-04 | Patrizio Vinciarelli | Sell | $201.54 | 50,000 | $10.1M |
| 2026-03-04 | Zheng John Shen | Sell | $205.75 | 1,217 | $250,398 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
VICR shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns VICR
Institutional investors own 71.0% of Vicor's shares and insiders 25.12%. The largest holder is BlackRock Inc with 5.34% of the shares (2.5M), as of June 30, 2026. Among the top 20 institutions, 11 added shares and 9 reduced their stake in the latest filings. Short interest is 11.52% of the float, or 2.76 days of average trading volume. The share count rose 19.8% since 2014.
Related: VICR analyst forecast, VICR key metrics. See the VICR stock overview for the latest quote and news.
VICR ownership FAQ
Who owns the most Vicor stock?
The largest shareholders of Vicor are BlackRock Inc (5.34%), JPMorgan Chase & Co (5.14%), T. Rowe Price Associates, Inc. (5.14%), Vanguard Portfolio Management, LLC (2.78%), Vanguard Capital Management, LLC (2.43%).
What percentage of Vicor is owned by institutions?
Institutions hold 71.0% of Vicor's shares outstanding; insiders hold 25.12%.
Which funds own Vicor?
The largest fund holders of Vicor are iShares Core S&P Mid-Cap ETF (1.91%), Vanguard MStar Total Stk Mkt Idx Invest (1.75%), Vanguard Small Cap Index (1.26%), T. Rowe Price Lrg Cp Gr I (1.11%), Needham Aggressive Growth Retail (1.04%).
What is Vicor's short interest?
2.4M shares of Vicor were sold short, 11.52% of the float; at the average daily volume it would take 2.76 days to cover.
Are insiders buying or selling Vicor?
Of the latest 20 reported insider transactions in Vicor (since March 4, 2026), 0 were purchases and 20 were sales.
How many shares of Vicor are outstanding?
Vicor has 34.4M shares outstanding, of which 25.7M are in the public float.