Who owns POWI (POWI)
Which tracked institutional funds hold POWI, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See POWI company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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 POWI is one-sided between 2025-Q4 and 2026-Q1: 122 added or opened and 38 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
POWI’s largest tracked holder by dollar value, BlackRock, Inc., 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 gap the other way — the median holder sizes POWI more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in POWI 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 307 tracked filers holding POWI, 169 increased or opened the position and 148 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 POWI 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 19
- VANGUARD PORTFOLIO MANAGEMENT LLC$255M
- VANGUARD CAPITAL MANAGEMENT LLC$128M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$122M
- Hudson Bay Capital Management LP$51M
- VANGUARD FIDUCIARY TRUST CO$20M
- NORGES BANK$14M
Full exits 23
- VANGUARD GROUP INC$252M
- RENAISSANCE TECHNOLOGIES LLC$7M
- MILLENNIUM MANAGEMENT LLC$4M
- D. E. Shaw & Co., Inc.$3M
- CANADA PENSION PLAN INVESTMENT BOARD$3M
- Trexquant Investment LP$3M
Largest adds
- WELLINGTON MANAGEMENT GROUP LLP$83M
- NEUBERGER BERMAN GROUP LLC$60M
- Nuveen, LLC$49M
- PRICE T ROWE ASSOCIATES INC /MD/$38M
- STATE STREET CORP$37M
- SNYDER CAPITAL MANAGEMENT L P$34M
Largest trims
- M&T Bank Corp$33M
- VOLORIDGE INVESTMENT MANAGEMENT, LLC$15M
- Grandeur Peak Global Advisors, LLC$11M
- PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO$9M
- NOMURA HOLDINGS INC$7M
- BARCLAYS PLC$4M
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 |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 6,024,354 | $308M | 9.0% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 4,975,859 | $255M | 7.4% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC trimmed | 3,933,099 | $201M | 5.9% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 3,298,599 | $169M | 4.9% | 2026-Q1 |
| STATE STREET CORP trimmed | 3,077,843 | $158M | 4.6% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,506,919 | $128M | 3.7% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC added | 2,380,677 | $122M | 3.6% | 2026-Q1 |
| SNYDER CAPITAL MANAGEMENT L P added | 2,104,063 | $108M | 3.1% | 2026-Q1 |
| DISCIPLINED GROWTH INVESTORS INC /MN trimmed | 1,959,172 | $100M | 2.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,674,825 | $86M | 2.5% | 2026-Q1 |
| MORGAN STANLEY added | 1,501,960 | $77M | 2.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,396,483 | $72M | 2.1% | 2026-Q1 |
| Copeland Capital Management, LLC added | 1,321,789 | $68M | 2.0% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 1,293,375 | $62M | 1.8% | 2026-Q1 |
| Capital International Investors trimmed | 1,112,390 | $57M | 1.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 1,057,155 | $54M | 1.6% | 2026-Q1 |
| Nuveen, LLC added | 1,048,153 | $54M | 1.6% | 2026-Q1 |
| Hudson Bay Capital Management LP new | 1,000,000 | $51M | 1.5% | 2026-Q1 |
| WESTWOOD HOLDINGS GROUP INC trimmed | 873,035 | $45M | 1.3% | 2026-Q1 |
| Robeco Schweiz AG added | 870,170 | $45M | 1.3% | 2026-Q1 |
| NORTHERN TRUST CORP added | 841,551 | $43M | 1.3% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 757,993 | $39M | 1.1% | 2026-Q1 |
| Stephens Investment Management Group LLC trimmed | 745,169 | $38M | 1.1% | 2026-Q1 |
| BROWN ADVISORY INC trimmed | 686,834 | $35M | 1.0% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 638,210 | $33M | 1.0% | 2026-Q1 |
| UBS Group AG added | 624,509 | $32M | 0.9% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 601,468 | $31M | 0.9% | 2026-Q1 |
| Boston Trust Walden Corp trimmed | 577,605 | $30M | 0.9% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 455,065 | $23M | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 385,209 | $20M | 0.6% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 360,161 | $18M | 0.5% | 2026-Q1 |
| ASR Vermogensbeheer N.V. added | 344,904 | $18M | 0.5% | 2026-Q1 |
| RIVERBRIDGE PARTNERS LLC trimmed | 336,068 | $17M | 0.5% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 335,747 | $17M | 0.5% | 2026-Q1 |
| Tributary Capital Management, LLC added | 325,433 | $17M | 0.5% | 2026-Q1 |
| NOMURA HOLDINGS INC trimmed | 325,257 | $17M | 0.5% | 2026-Q1 |
| Granite Investment Partners, LLC trimmed | 324,926 | $17M | 0.5% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 293,034 | $15M | 0.4% | 2026-Q1 |
| ProShare Advisors LLC trimmed | 284,013 | $15M | 0.4% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 282,943 | $14M | 0.4% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 271,385 | $14M | 0.4% | 2026-Q1 |
| NORGES BANK trimmed | 271,489 | $14M | 0.4% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 262,939 | $13M | 0.4% | 2026-Q1 |
| Ceredex Value Advisors LLC trimmed | 262,050 | $13M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 243,564 | $12M | 0.4% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 233,564 | $12M | 0.3% | 2026-Q1 |
| Invesco Ltd. trimmed | 230,651 | $12M | 0.3% | 2026-Q1 |
| CRAWFORD INVESTMENT COUNSEL INC added | 227,939 | $12M | 0.3% | 2026-Q1 |
| Foresight Group Ltd Liability Partnership trimmed | 219,475 | $11M | 0.3% | 2026-Q1 |
| SEI INVESTMENTS CO added | 218,429 | $11M | 0.3% | 2026-Q1 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 206,508 | $11M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 198,572 | $10M | 0.3% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 193,917 | $10M | 0.3% | 2026-Q1 |
| HERALD INVESTMENT MANAGEMENT Ltd added | 175,000 | $9M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 158,779 | $8M | 0.2% | 2026-Q1 |
| Handelsbanken Fonder AB added | 148,033 | $8M | 0.2% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 156,928 | $8M | 0.2% | 2026-Q1 |
| S SQUARED TECHNOLOGY, LLC added | 136,900 | $7M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 131,658 | $7M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 136,646 | $7M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 130,707 | $7M | 0.2% | 2026-Q1 |
| SORA INVESTORS LLC added | 120,000 | $6M | 0.2% | 2026-Q1 |
| EMERALD ADVISERS, LLC new | 116,044 | $6M | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 114,876 | $6M | 0.2% | 2026-Q1 |
| NICHOLAS COMPANY, INC. trimmed | 110,180 | $6M | 0.2% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 109,941 | $6M | 0.2% | 2026-Q1 |
| Swiss National Bank trimmed | 109,500 | $6M | 0.2% | 2026-Q1 |
| BESSEMER GROUP INC added | 108,288 | $6M | 0.2% | 2026-Q1 |
| Madison Asset Management, LLC trimmed | 102,882 | $5M | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 93,632 | $5M | 0.1% | 2026-Q1 |
| Holocene Advisors, LP added | 87,931 | $5M | 0.1% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 82,597 | $4M | 0.1% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added | 71,100 | $4M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 65,641 | $3M | 0.1% | 2026-Q1 |
| HARBOR CAPITAL ADVISORS, INC. added | 62,921 | $3M | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 62,397 | $3M | 0.1% | 2026-Q1 |
| Creative Planning added | 62,196 | $3M | 0.1% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 61,827 | $3M | 0.1% | 2026-Q1 |
| EMERALD MUTUAL FUND ADVISERS TRUST new | 61,294 | $3M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 7,085,894 | $252M | 7.3% | 2025-Q4 stale |
| Grantham, Mayo, Van Otterloo & Co. LLC trimmed | 460,765 | $26M | 0.8% | 2025-Q2 stale |
| CONGRESS ASSET MANAGEMENT CO trimmed | 593,599 | $24M | 0.7% | 2025-Q3 stale |
| Fiera Capital Corp trimmed | 449,344 | $18M | 0.5% | 2025-Q3 stale |
| Vontobel Holding Ltd. trimmed | 285,220 | $14M | 0.4% | 2025-Q1 stale |
| JANE STREET GROUP, LLC added | 272,429 | $11M | 0.3% | 2025-Q3 stale |
| Squarepoint Ops LLC trimmed | 236,703 | $10M | 0.3% | 2025-Q3 stale |
| M&G PLC added | 153,428 | $9M | 0.3% | 2025-Q2 stale |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 206,100 | $7M | 0.2% | 2025-Q4 stale |
| WASATCH ADVISORS LP trimmed | 140,967 | $7M | 0.2% | 2025-Q1 stale |
| California Public Employees Retirement System added | 106,768 | $6M | 0.2% | 2025-Q2 stale |
| WESTERLY CAPITAL MANAGEMENT, LLC added | 120,000 | $5M | 0.1% | 2025-Q3 stale |
| Walleye Capital LLC added | 114,064 | $5M | 0.1% | 2025-Q3 stale |
| CW Advisors, LLC trimmed | 81,894 | $5M | 0.1% | 2025-Q2 stale |
| Corebridge Financial, Inc. trimmed | 90,231 | $5M | 0.1% | 2025-Q1 stale |
| Qube Research & Technologies Ltd added | 112,758 | $5M | 0.1% | 2025-Q3 stale |
| Y-Intercept (Hong Kong) Ltd added | 99,393 | $4M | 0.1% | 2025-Q3 stale |
| MILLENNIUM MANAGEMENT LLC trimmed | 106,559 | $4M | 0.1% | 2025-Q4 stale |
| Verition Fund Management LLC added | 90,853 | $4M | 0.1% | 2025-Q3 stale |
| DARK FOREST CAPITAL MANAGEMENT LP added | 67,419 | $3M | 0.1% | 2025-Q1 stale |
| EFG Asset Management (North America) Corp. trimmed | 60,013 | $3M | 0.1% | 2025-Q2 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.