Who owns Western Digital (WDC)
Which tracked institutional funds hold WDC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See WDC company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 WDC is one-sided between 2025-Q4 and 2026-Q1: 711 added or opened and 178 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
WDC’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.4% of its own reported 13F book, while the median holder sizes it at 0.2% of theirs — a 0.2pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in WDC 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 1404 tracked filers holding WDC, 795 increased or opened the position and 615 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 WDC 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 128
- VANGUARD CAPITAL MANAGEMENT LLC$6.0B
- VANGUARD PORTFOLIO MANAGEMENT LLC$4.6B
- Capital Research Global Investors$895M
- VANGUARD FIDUCIARY TRUST CO$516M
- Value Aligned Research Advisors, LLC$350M
- Vanguard Global Advisers, LLC$202M
Full exits 63
- VANGUARD GROUP INC$7.3B
- Wolf Hill Capital Management, LP$102M
- Slate Path Capital LP$55M
- VIRGINIA RETIREMENT SYSTEMS ET Al$51M
- KEYSTONE INVESTORS PTE LTD$34M
- FORSTA AP-FONDEN$29M
Largest adds
- BlackRock, Inc.$3.1B
- Capital World Investors$3.0B
- FMR LLC$2.7B
- JPMORGAN CHASE & CO$1.9B
- STATE STREET CORP$1.5B
- Invesco Ltd.$985M
Largest trims
- Amundi$1.2B
- NORGES BANK$585M
- D. E. Shaw & Co., Inc.$255M
- CITADEL ADVISORS LLC$155M
- ALLIANCEBERNSTEIN L.P.$149M
- BANK OF NOVA SCOTIA$96M
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 | 32,953,613 | $21.0B | 15.7% | 2026-Q2 |
| FMR LLC trimmed | 25,983,645 | $16.6B | 12.3% | 2026-Q2 |
| Capital World Investors added | 16,598,211 | $10.6B | 7.9% | 2026-Q2 |
| STATE STREET CORP added | 16,276,615 | $10.4B | 7.7% | 2026-Q2 |
| Invesco Ltd. added | 14,435,741 | $9.2B | 6.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 22,034,861 | $6.0B | 4.4% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 17,172,653 | $4.6B | 3.5% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 17,512,148 | $4.4B | 3.3% | 2026-Q1 |
| NORGES BANK trimmed | 4,629,232 | $3.0B | 2.2% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 9,477,201 | $2.6B | 1.9% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 8,489,612 | $2.3B | 1.7% | 2026-Q1 |
| MORGAN STANLEY trimmed | 7,939,106 | $2.1B | 1.6% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 2,940,948 | $1.9B | 1.4% | 2026-Q2 |
| Capital Research Global Investors trimmed | 2,816,570 | $1.8B | 1.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 5,762,533 | $1.6B | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 5,406,883 | $1.5B | 1.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 2,075,801 | $1.3B | 1.0% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 1,901,787 | $1.2B | 0.9% | 2026-Q2 |
| Capital International Investors new | 1,803,588 | $1.2B | 0.9% | 2026-Q2 |
| UBS Group AG trimmed | 4,182,454 | $1.1B | 0.8% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 1,632,121 | $1.1B | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 3,606,563 | $976M | 0.7% | 2026-Q1 |
| Amundi added | 3,058,867 | $827M | 0.6% | 2026-Q1 |
| Nuveen, LLC trimmed | 2,959,245 | $800M | 0.6% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 2,902,748 | $785M | 0.6% | 2026-Q1 |
| FRED ALGER MANAGEMENT, LLC trimmed | 2,659,835 | $719M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp added | 2,508,752 | $679M | 0.5% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 2,503,321 | $677M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 2,206,941 | $597M | 0.4% | 2026-Q1 |
| Legal & General Group Plc added | 2,129,170 | $576M | 0.4% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 863,206 | $551M | 0.4% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO new | 1,908,325 | $516M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 1,872,796 | $507M | 0.4% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 657,878 | $420M | 0.3% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 1,545,167 | $417M | 0.3% | 2026-Q1 |
| National Pension Service trimmed | 1,437,962 | $389M | 0.3% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 1,405,042 | $380M | 0.3% | 2026-Q1 |
| Maple Rock Capital Partners Inc. trimmed | 1,400,434 | $379M | 0.3% | 2026-Q1 |
| AMF Tjanstepension AB trimmed | 1,373,910 | $372M | 0.3% | 2026-Q1 |
| Value Aligned Research Advisors, LLC new | 1,295,439 | $350M | 0.3% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 1,271,074 | $344M | 0.3% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 537,473 | $343M | 0.3% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 516,440 | $330M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 1,188,956 | $322M | 0.2% | 2026-Q1 |
| Soroban Capital Partners LP | 1,146,273 | $310M | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 1,050,033 | $284M | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 1,024,545 | $277M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 1,003,307 | $271M | 0.2% | 2026-Q1 |
| Robeco Institutional Asset Management B.V. trimmed | 984,685 | $266M | 0.2% | 2026-Q1 |
| Polar Capital Holdings Plc added | 972,432 | $263M | 0.2% | 2026-Q1 |
| Whale Rock Capital Management LLC trimmed | 400,687 | $256M | 0.2% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 400,306 | $256M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 891,662 | $241M | 0.2% | 2026-Q1 |
| Castle Hook Partners LP trimmed | 878,939 | $238M | 0.2% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 836,666 | $226M | 0.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 351,962 | $225M | 0.2% | 2026-Q2 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main added | 827,668 | $224M | 0.2% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 817,564 | $221M | 0.2% | 2026-Q1 |
| WT Asset Management Ltd added | 816,707 | $221M | 0.2% | 2026-Q1 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 796,983 | $216M | 0.2% | 2026-Q1 |
| Holocene Advisors, LP trimmed | 761,886 | $206M | 0.2% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 745,156 | $202M | 0.1% | 2026-Q1 |
| Anther Capital Ltd new | 712,395 | $193M | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 701,352 | $190M | 0.1% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 676,042 | $183M | 0.1% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 671,717 | $182M | 0.1% | 2026-Q1 |
| Clal Insurance Enterprises Holdings Ltd added | 648,250 | $175M | 0.1% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 629,886 | $170M | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC trimmed | 616,644 | $167M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 594,405 | $161M | 0.1% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 588,392 | $159M | 0.1% | 2026-Q1 |
| Jericho Capital Asset Management L.P. new | 581,562 | $157M | 0.1% | 2026-Q1 |
| CITIGROUP INC trimmed | 572,493 | $155M | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 568,828 | $154M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 524,436 | $142M | 0.1% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT CO LTD trimmed | 509,267 | $138M | 0.1% | 2026-Q1 |
| ProShare Advisors LLC trimmed | 501,292 | $136M | 0.1% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 497,009 | $134M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 495,174 | $134M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 763,080 | $131M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 473,874 | $128M | 0.1% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC added | 456,245 | $123M | 0.1% | 2026-Q1 |
| NATIONAL BANK OF CANADA /FI/ added | 434,731 | $118M | 0.1% | 2026-Q1 |
| NATIXIS ADVISORS, LLC added | 423,953 | $115M | 0.1% | 2026-Q1 |
| Bridgewater Associates, LP trimmed | 172,415 | $110M | 0.1% | 2026-Q2 |
| Employees Provident Fund Board new | 405,167 | $110M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 401,675 | $107M | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 396,886 | $107M | 0.1% | 2026-Q1 |
| PARNASSUS INVESTMENTS, LLC trimmed | 396,802 | $107M | 0.1% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 373,591 | $101M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 369,889 | $100M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 156,483 | $100M | 0.1% | 2026-Q2 |
| LSV ASSET MANAGEMENT trimmed | 369,272 | $100M | 0.1% | 2026-Q1 |
| Gotham Asset Management, LLC trimmed | 367,768 | $99M | 0.1% | 2026-Q1 |
| NORDEA INVESTMENT MANAGEMENT AB added | 380,371 | $99M | 0.1% | 2026-Q1 |
| Korea Investment CORP trimmed | 365,410 | $99M | 0.1% | 2026-Q1 |
| BANK OF NOVA SCOTIA trimmed | 363,175 | $98M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 42,348,660 | $7.3B | 5.4% | 2025-Q4 stale |
| Impactive Capital LP added | 3,571,435 | $229M | 0.2% | 2025-Q2 stale |
| Wolf Hill Capital Management, LP trimmed | 590,395 | $102M | 0.1% | 2025-Q4 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.