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Institutional Ownership · SEC Form 13F

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.

307
Institutional holders
61,125,417
Shares held (tracked funds)

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).

FundSharesReported value% of valueQuarter
BlackRock, Inc. trimmed6,024,354$308M9.0%2026-Q1
VANGUARD PORTFOLIO MANAGEMENT LLC new4,975,859$255M7.4%2026-Q1
NEUBERGER BERMAN GROUP LLC trimmed3,933,099$201M5.9%2026-Q1
WELLINGTON MANAGEMENT GROUP LLP added3,298,599$169M4.9%2026-Q1
STATE STREET CORP trimmed3,077,843$158M4.6%2026-Q1
VANGUARD CAPITAL MANAGEMENT LLC new2,506,919$128M3.7%2026-Q1
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC added2,380,677$122M3.6%2026-Q1
SNYDER CAPITAL MANAGEMENT L P added2,104,063$108M3.1%2026-Q1
DISCIPLINED GROWTH INVESTORS INC /MN trimmed1,959,172$100M2.9%2026-Q1
GEODE CAPITAL MANAGEMENT, LLC added1,674,825$86M2.5%2026-Q1
MORGAN STANLEY added1,501,960$77M2.2%2026-Q1
PRICE T ROWE ASSOCIATES INC /MD/ added1,396,483$72M2.1%2026-Q1
Copeland Capital Management, LLC added1,321,789$68M2.0%2026-Q1
JPMORGAN CHASE & CO trimmed1,293,375$62M1.8%2026-Q1
Capital International Investors trimmed1,112,390$57M1.7%2026-Q1
DIMENSIONAL FUND ADVISORS LP added1,057,155$54M1.6%2026-Q1
Nuveen, LLC added1,048,153$54M1.6%2026-Q1
Hudson Bay Capital Management LP new1,000,000$51M1.5%2026-Q1
WESTWOOD HOLDINGS GROUP INC trimmed873,035$45M1.3%2026-Q1
Robeco Schweiz AG added870,170$45M1.3%2026-Q1
NORTHERN TRUST CORP added841,551$43M1.3%2026-Q1
CHARLES SCHWAB INVESTMENT MANAGEMENT INC added757,993$39M1.1%2026-Q1
Stephens Investment Management Group LLC trimmed745,169$38M1.1%2026-Q1
BROWN ADVISORY INC trimmed686,834$35M1.0%2026-Q1
BNP PARIBAS ASSET MANAGEMENT Holding S.A. added638,210$33M1.0%2026-Q1
UBS Group AG added624,509$32M0.9%2026-Q1
BANK OF AMERICA CORP /DE/ added601,468$31M0.9%2026-Q1
Boston Trust Walden Corp trimmed577,605$30M0.9%2026-Q1
Bank of New York Mellon Corp trimmed455,065$23M0.7%2026-Q1
VANGUARD FIDUCIARY TRUST CO new385,209$20M0.6%2026-Q1
MARSHALL WACE, LLP trimmed360,161$18M0.5%2026-Q1
ASR Vermogensbeheer N.V. added344,904$18M0.5%2026-Q1
RIVERBRIDGE PARTNERS LLC trimmed336,068$17M0.5%2026-Q1
GOLDMAN SACHS GROUP INC trimmed335,747$17M0.5%2026-Q1
Tributary Capital Management, LLC added325,433$17M0.5%2026-Q1
NOMURA HOLDINGS INC trimmed325,257$17M0.5%2026-Q1
Granite Investment Partners, LLC trimmed324,926$17M0.5%2026-Q1
ENVESTNET ASSET MANAGEMENT INC added293,034$15M0.4%2026-Q1
ProShare Advisors LLC trimmed284,013$15M0.4%2026-Q1
Connor, Clark & Lunn Investment Management Ltd. added282,943$14M0.4%2026-Q1
PRINCIPAL FINANCIAL GROUP INC added271,385$14M0.4%2026-Q1
NORGES BANK trimmed271,489$14M0.4%2026-Q1
FEDERATED HERMES, INC. trimmed262,939$13M0.4%2026-Q1
Ceredex Value Advisors LLC trimmed262,050$13M0.4%2026-Q1
DEUTSCHE BANK AG\ added243,564$12M0.4%2026-Q1
LOOMIS SAYLES & CO L P trimmed233,564$12M0.3%2026-Q1
Invesco Ltd. trimmed230,651$12M0.3%2026-Q1
CRAWFORD INVESTMENT COUNSEL INC added227,939$12M0.3%2026-Q1
Foresight Group Ltd Liability Partnership trimmed219,475$11M0.3%2026-Q1
SEI INVESTMENTS CO added218,429$11M0.3%2026-Q1
SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed206,508$11M0.3%2026-Q1
Public Sector Pension Investment Board added198,572$10M0.3%2026-Q1
FIRST TRUST ADVISORS LP trimmed193,917$10M0.3%2026-Q1
HERALD INVESTMENT MANAGEMENT Ltd added175,000$9M0.3%2026-Q1
RHUMBLINE ADVISERS trimmed158,779$8M0.2%2026-Q1
Handelsbanken Fonder AB added148,033$8M0.2%2026-Q1
WCM INVESTMENT MANAGEMENT, LLC trimmed156,928$8M0.2%2026-Q1
S SQUARED TECHNOLOGY, LLC added136,900$7M0.2%2026-Q1
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added131,658$7M0.2%2026-Q1
AQR CAPITAL MANAGEMENT LLC trimmed136,646$7M0.2%2026-Q1
Legal & General Group Plc trimmed130,707$7M0.2%2026-Q1
SORA INVESTORS LLC added120,000$6M0.2%2026-Q1
EMERALD ADVISERS, LLC new116,044$6M0.2%2026-Q1
Russell Investments Group, Ltd. added114,876$6M0.2%2026-Q1
NICHOLAS COMPANY, INC. trimmed110,180$6M0.2%2026-Q1
CITADEL ADVISORS LLC added109,941$6M0.2%2026-Q1
Swiss National Bank trimmed109,500$6M0.2%2026-Q1
BESSEMER GROUP INC added108,288$6M0.2%2026-Q1
Madison Asset Management, LLC trimmed102,882$5M0.2%2026-Q1
AMERIPRISE FINANCIAL INC trimmed93,632$5M0.1%2026-Q1
Holocene Advisors, LP added87,931$5M0.1%2026-Q1
ROYAL BANK OF CANADA added82,597$4M0.1%2026-Q1
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added71,100$4M0.1%2026-Q1
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added65,641$3M0.1%2026-Q1
HARBOR CAPITAL ADVISORS, INC. added62,921$3M0.1%2026-Q1
WELLS FARGO & COMPANY/MN trimmed62,397$3M0.1%2026-Q1
Creative Planning added62,196$3M0.1%2026-Q1
MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed61,827$3M0.1%2026-Q1
EMERALD MUTUAL FUND ADVISERS TRUST new61,294$3M0.1%2026-Q1
VANGUARD GROUP INC trimmed7,085,894$252M7.3%2025-Q4 stale
Grantham, Mayo, Van Otterloo & Co. LLC trimmed460,765$26M0.8%2025-Q2 stale
CONGRESS ASSET MANAGEMENT CO trimmed593,599$24M0.7%2025-Q3 stale
Fiera Capital Corp trimmed449,344$18M0.5%2025-Q3 stale
Vontobel Holding Ltd. trimmed285,220$14M0.4%2025-Q1 stale
JANE STREET GROUP, LLC added272,429$11M0.3%2025-Q3 stale
Squarepoint Ops LLC trimmed236,703$10M0.3%2025-Q3 stale
M&G PLC added153,428$9M0.3%2025-Q2 stale
RENAISSANCE TECHNOLOGIES LLC trimmed206,100$7M0.2%2025-Q4 stale
WASATCH ADVISORS LP trimmed140,967$7M0.2%2025-Q1 stale
California Public Employees Retirement System added106,768$6M0.2%2025-Q2 stale
WESTERLY CAPITAL MANAGEMENT, LLC added120,000$5M0.1%2025-Q3 stale
Walleye Capital LLC added114,064$5M0.1%2025-Q3 stale
CW Advisors, LLC trimmed81,894$5M0.1%2025-Q2 stale
Corebridge Financial, Inc. trimmed90,231$5M0.1%2025-Q1 stale
Qube Research & Technologies Ltd added112,758$5M0.1%2025-Q3 stale
Y-Intercept (Hong Kong) Ltd added99,393$4M0.1%2025-Q3 stale
MILLENNIUM MANAGEMENT LLC trimmed106,559$4M0.1%2025-Q4 stale
Verition Fund Management LLC added90,853$4M0.1%2025-Q3 stale
DARK FOREST CAPITAL MANAGEMENT LP added67,419$3M0.1%2025-Q1 stale
EFG Asset Management (North America) Corp. trimmed60,013$3M0.1%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.

HoldersTotal shares

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.

Learn how to read institutional ownership