Who owns Vicor Corporation (VICR)
Which tracked institutional funds hold VICR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See VICR company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-21). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on VICR is one-sided between 2025-Q4 and 2026-Q1: 175 added or opened and 40 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
VICR’s largest tracked holder by dollar value, PRICE T ROWE ASSOCIATES INC /MD/, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in VICR divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 367 tracked filers holding VICR, 229 increased or opened the position and 140 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in VICR between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 58
- VANGUARD PORTFOLIO MANAGEMENT LLC$187M
- VANGUARD CAPITAL MANAGEMENT LLC$167M
- JANE STREET GROUP, LLC$53M
- Driehaus Capital Management LLC$31M
- VANGUARD FIDUCIARY TRUST CO$25M
- SILVERCREST ASSET MANAGEMENT GROUP LLC$19M
Full exits 11
- VANGUARD GROUP INC$257M
- Manatuck Hill Partners, LLC$3M
- DARK FOREST CAPITAL MANAGEMENT LP$1M
- Illinois Municipal Retirement Fund$1M
- CAXTON ASSOCIATES LLP$1M
- VestGen Advisors, LLC$803K
Largest adds
- PRICE T ROWE ASSOCIATES INC /MD/$256M
- MANUFACTURERS LIFE INSURANCE COMPANY, THE$50M
- GOLDMAN SACHS GROUP INC$47M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$45M
- STATE STREET CORP$39M
- MILLENNIUM MANAGEMENT LLC$35M
Largest trims
- JPMORGAN CHASE & CO$141M
- BlackRock, Inc.$114M
- ASHFORD CAPITAL MANAGEMENT INC$21M
- MARSHALL WACE, LLP$11M
- Nuveen, LLC$8M
- Public Sector Pension Investment Board$6M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,888,446 | $304M | 9.3% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 2,106,726 | $300M | 9.2% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,724,123 | $278M | 8.5% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 1,162,134 | $187M | 5.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,034,740 | $167M | 5.1% | 2026-Q1 |
| STATE STREET CORP trimmed | 811,617 | $131M | 4.0% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 603,364 | $97M | 3.0% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 602,661 | $97M | 3.0% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 536,274 | $86M | 2.7% | 2026-Q1 |
| NEEDHAM INVESTMENT MANAGEMENT LLC trimmed | 522,000 | $84M | 2.6% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 493,670 | $79M | 2.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 389,767 | $63M | 1.9% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 327,715 | $53M | 1.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 306,929 | $49M | 1.5% | 2026-Q1 |
| AWM Investment Company, Inc. trimmed | 288,180 | $46M | 1.4% | 2026-Q1 |
| NORTHERN TRUST CORP added | 272,711 | $44M | 1.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 221,867 | $36M | 1.1% | 2026-Q1 |
| HERALD INVESTMENT MANAGEMENT Ltd trimmed | 220,000 | $35M | 1.1% | 2026-Q1 |
| COLRAIN CAPITAL LLC trimmed | 201,633 | $32M | 1.0% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 194,453 | $31M | 1.0% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 189,463 | $31M | 0.9% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 163,953 | $26M | 0.8% | 2026-Q1 |
| FMR LLC trimmed | 163,938 | $26M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 158,380 | $25M | 0.8% | 2026-Q1 |
| Arosa Capital Management LP added | 156,500 | $25M | 0.8% | 2026-Q1 |
| PINNACLE ASSOCIATES LTD trimmed | 155,976 | $25M | 0.8% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 146,844 | $24M | 0.7% | 2026-Q1 |
| Bank of New York Mellon Corp added | 140,286 | $23M | 0.7% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 137,316 | $22M | 0.7% | 2026-Q1 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC new | 115,442 | $19M | 0.6% | 2026-Q1 |
| GF FUND MANAGEMENT CO. LTD. new | 115,245 | $19M | 0.6% | 2026-Q1 |
| ASHFORD CAPITAL MANAGEMENT INC trimmed | 113,535 | $18M | 0.6% | 2026-Q1 |
| Nuveen, LLC trimmed | 110,666 | $18M | 0.5% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 110,229 | $18M | 0.5% | 2026-Q1 |
| Invesco Ltd. trimmed | 105,441 | $17M | 0.5% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 102,471 | $16M | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 102,107 | $16M | 0.5% | 2026-Q1 |
| UBS Group AG added | 92,423 | $15M | 0.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 89,555 | $14M | 0.4% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 85,295 | $14M | 0.4% | 2026-Q1 |
| HRT FINANCIAL LP added | 83,920 | $14M | 0.4% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 75,020 | $12M | 0.4% | 2026-Q1 |
| CIBC WORLD MARKET INC. added | 73,100 | $12M | 0.4% | 2026-Q1 |
| Ariose Capital Management Ltd new | 72,788 | $12M | 0.4% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 101,217 | $11M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 67,820 | $11M | 0.3% | 2026-Q1 |
| Bruce & Co., Inc. trimmed | 65,000 | $10M | 0.3% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 60,060 | $10M | 0.3% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 56,468 | $9M | 0.3% | 2026-Q1 |
| Andar Capital Management HK Ltd added | 55,000 | $9M | 0.3% | 2026-Q1 |
| Empowered Funds, LLC added | 51,091 | $8M | 0.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 50,738 | $8M | 0.3% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 47,300 | $8M | 0.2% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 46,435 | $7M | 0.2% | 2026-Q1 |
| Informed Momentum Co LLC trimmed | 46,108 | $7M | 0.2% | 2026-Q1 |
| Swiss National Bank trimmed | 45,632 | $7M | 0.2% | 2026-Q1 |
| CHAPIN DAVIS, INC. | 44,200 | $7M | 0.2% | 2026-Q1 |
| VESTOR CAPITAL, LLC new | 44,163 | $7M | 0.2% | 2026-Q1 |
| Tidal Investments LLC added | 44,118 | $7M | 0.2% | 2026-Q1 |
| Mariner, LLC added | 41,760 | $7M | 0.2% | 2026-Q1 |
| Alight Capital Management LP trimmed | 40,000 | $6M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 39,388 | $6M | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 37,009 | $6M | 0.2% | 2026-Q1 |
| Man Group plc added | 35,856 | $6M | 0.2% | 2026-Q1 |
| GatePass Capital, LLC added | 35,600 | $6M | 0.2% | 2026-Q1 |
| Bridgewater Associates, LP added | 33,207 | $5M | 0.2% | 2026-Q1 |
| BESSEMER GROUP INC added | 31,359 | $5M | 0.2% | 2026-Q1 |
| SG Americas Securities, LLC added | 31,268 | $5M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 30,901 | $5M | 0.2% | 2026-Q1 |
| IRONWOOD INVESTMENT MANAGEMENT LLC trimmed | 30,889 | $5M | 0.2% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH new | 30,655 | $5M | 0.2% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC trimmed | 30,509 | $5M | 0.2% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC trimmed | 30,404 | $5M | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 29,067 | $5M | 0.1% | 2026-Q1 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 28,807 | $5M | 0.1% | 2026-Q1 |
| Weiss Asset Management LP new | 28,500 | $5M | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC trimmed | 28,398 | $5M | 0.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 27,858 | $4M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 26,961 | $4M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 26,673 | $4M | 0.1% | 2026-Q1 |
| Portolan Capital Management, LLC trimmed | 26,670 | $4M | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 26,591 | $4M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 25,923 | $4M | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 25,663 | $4M | 0.1% | 2026-Q1 |
| Bouvel Investment Partners, LLC added | 24,938 | $4M | 0.1% | 2026-Q1 |
| Retirement Systems of Alabama trimmed | 24,103 | $4M | 0.1% | 2026-Q1 |
| Jump Financial, LLC added | 23,803 | $4M | 0.1% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 74,981 | $4M | 0.1% | 2026-Q1 |
| MetLife Investment Management, LLC added | 23,373 | $4M | 0.1% | 2026-Q1 |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM trimmed | 22,936 | $4M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 22,687 | $4M | 0.1% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 22,682 | $4M | 0.1% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 22,529 | $4M | 0.1% | 2026-Q1 |
| ALGERT GLOBAL LLC trimmed | 22,371 | $4M | 0.1% | 2026-Q1 |
| Chicago Capital, LLC added | 20,722 | $3M | 0.1% | 2026-Q1 |
| FORA Capital, LLC added | 20,707 | $3M | 0.1% | 2026-Q1 |
| KINGDON CAPITAL MANAGEMENT, L.L.C. new | 20,000 | $3M | 0.1% | 2026-Q1 |
| LPL Financial LLC trimmed | 19,775 | $3M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 2,346,584 | $257M | 7.9% | 2025-Q4 stale |
| BROWN CAPITAL MANAGEMENT LLC trimmed | 737,043 | $34M | 1.1% | 2025-Q1 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.