Who owns Seagate Technology Holdings (STX)
Which tracked institutional funds hold STX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See STX 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 STX is one-sided between 2026-Q1 and 2026-Q2: 33 added or opened and 873 trimmed or exited — on balance reducing.
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
STX’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.3% of its own reported 13F book, while the median holder sizes it at 0.2% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in STX 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 1704 tracked filers holding STX, 795 increased or opened the position and 620 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 STX between the 2026-Q1 and 2026-Q2 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 9
- Capital International Investors$996M
- LONE PINE CAPITAL LLC$965M
- Sachem Head Capital Management LP$455M
- TIGER GLOBAL MANAGEMENT LLC$275M
- Capital World Investors$146M
- Whale Rock Capital Management LLC$143M
Full exits 871
- VANGUARD CAPITAL MANAGEMENT LLC$5.5B
- Sanders Capital, LLC$5.1B
- VANGUARD PORTFOLIO MANAGEMENT LLC$4.3B
- JPMORGAN CHASE & CO$2.4B
- GEODE CAPITAL MANAGEMENT, LLC$2.0B
- MORGAN STANLEY$1.9B
Largest adds
- BlackRock, Inc.$9.7B
- STATE STREET CORP$5.9B
- Invesco Ltd.$5.5B
- FMR LLC$4.7B
- WCM INVESTMENT MANAGEMENT, LLC$3.6B
- NORGES BANK$2.9B
Largest trims
- Brevan Howard Capital Management LP$4M
- Temasek Holdings (Private) Ltd$1M
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. added | 15,166,793 | $14.6B | 12.5% | 2026-Q2 |
| STATE STREET CORP added | 9,911,669 | $9.6B | 8.2% | 2026-Q2 |
| FMR LLC trimmed | 8,153,134 | $7.9B | 6.7% | 2026-Q2 |
| Invesco Ltd. added | 7,536,880 | $7.3B | 6.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 14,155,673 | $5.5B | 4.7% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC added | 5,320,463 | $5.2B | 4.4% | 2026-Q2 |
| Sanders Capital, LLC trimmed | 12,897,201 | $5.1B | 4.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 11,094,908 | $4.3B | 3.7% | 2026-Q1 |
| Capital Research Global Investors trimmed | 4,326,781 | $4.2B | 3.6% | 2026-Q2 |
| NORGES BANK added | 3,095,723 | $3.0B | 2.5% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 6,659,239 | $2.4B | 2.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 2,414,136 | $2.3B | 2.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 5,060,828 | $2.0B | 1.7% | 2026-Q1 |
| MORGAN STANLEY trimmed | 4,759,312 | $1.9B | 1.6% | 2026-Q1 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main trimmed | 3,620,072 | $1.4B | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 3,573,790 | $1.4B | 1.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,430,343 | $1.4B | 1.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 3,518,195 | $1.4B | 1.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 3,380,440 | $1.3B | 1.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 1,354,377 | $1.3B | 1.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,245,371 | $1.2B | 1.0% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 2,536,122 | $1.0B | 0.9% | 2026-Q1 |
| Capital International Investors new | 1,032,054 | $996M | 0.8% | 2026-Q2 |
| LONE PINE CAPITAL LLC new | 1,000,109 | $965M | 0.8% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 822,914 | $794M | 0.7% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 1,896,993 | $743M | 0.6% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 755,495 | $729M | 0.6% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 1,804,383 | $707M | 0.6% | 2026-Q1 |
| SANDS CAPITAL MANAGEMENT, LLC added | 720,741 | $696M | 0.6% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 1,759,174 | $689M | 0.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 633,069 | $611M | 0.5% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,534,212 | $601M | 0.5% | 2026-Q1 |
| Legal & General Group Plc trimmed | 1,514,617 | $593M | 0.5% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 1,433,495 | $562M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 1,364,839 | $535M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,201,062 | $471M | 0.4% | 2026-Q1 |
| Sachem Head Capital Management LP trimmed | 472,000 | $455M | 0.4% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 457,353 | $441M | 0.4% | 2026-Q2 |
| Holocene Advisors, LP added | 1,087,617 | $426M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 1,058,303 | $415M | 0.4% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 1,013,493 | $397M | 0.3% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 1,008,491 | $395M | 0.3% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 967,528 | $379M | 0.3% | 2026-Q1 |
| Amundi added | 965,565 | $378M | 0.3% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 966,461 | $377M | 0.3% | 2026-Q1 |
| Polar Capital Holdings Plc trimmed | 933,859 | $366M | 0.3% | 2026-Q1 |
| Value Aligned Research Advisors, LLC added | 914,657 | $358M | 0.3% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 883,574 | $346M | 0.3% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 354,816 | $342M | 0.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 836,018 | $327M | 0.3% | 2026-Q1 |
| National Pension Service trimmed | 827,761 | $324M | 0.3% | 2026-Q1 |
| Nuveen, LLC trimmed | 771,379 | $302M | 0.3% | 2026-Q1 |
| Atalan Capital Partners, LP trimmed | 718,800 | $282M | 0.2% | 2026-Q1 |
| Swedbank AB added | 709,160 | $278M | 0.2% | 2026-Q1 |
| TIGER GLOBAL MANAGEMENT LLC new | 285,100 | $275M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 669,828 | $262M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 639,400 | $250M | 0.2% | 2026-Q1 |
| UBS Group AG added | 632,683 | $248M | 0.2% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 256,151 | $247M | 0.2% | 2026-Q2 |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 604,893 | $237M | 0.2% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 590,505 | $231M | 0.2% | 2026-Q1 |
| Castle Hook Partners LP trimmed | 561,647 | $220M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 536,658 | $210M | 0.2% | 2026-Q1 |
| Soroban Capital Partners LP | 534,364 | $209M | 0.2% | 2026-Q1 |
| Maple Rock Capital Partners Inc. trimmed | 533,985 | $209M | 0.2% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. added | 522,344 | $205M | 0.2% | 2026-Q1 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 518,454 | $203M | 0.2% | 2026-Q1 |
| CACTI ASSET MANAGEMENT LLC trimmed | 526,005 | $202M | 0.2% | 2026-Q1 |
| Bridgewater Associates, LP trimmed | 199,822 | $193M | 0.2% | 2026-Q2 |
| WT Asset Management Ltd added | 489,785 | $192M | 0.2% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 477,174 | $187M | 0.2% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 188,777 | $182M | 0.2% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 433,174 | $169M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 429,000 | $168M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 385,329 | $151M | 0.1% | 2026-Q1 |
| Avala Global LP added | 379,430 | $149M | 0.1% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 378,527 | $148M | 0.1% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 376,308 | $147M | 0.1% | 2026-Q1 |
| Capital World Investors new | 151,440 | $146M | 0.1% | 2026-Q2 |
| Whale Rock Capital Management LLC new | 148,543 | $143M | 0.1% | 2026-Q2 |
| California Public Employees Retirement System added | 360,397 | $141M | 0.1% | 2026-Q1 |
| CITIGROUP INC trimmed | 336,563 | $132M | 0.1% | 2026-Q1 |
| Anther Capital Ltd new | 331,233 | $130M | 0.1% | 2026-Q1 |
| TOMS Capital Investment Management LP new | 331,000 | $130M | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 325,412 | $127M | 0.1% | 2026-Q1 |
| ProShare Advisors LLC trimmed | 318,510 | $125M | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 311,448 | $122M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 307,293 | $120M | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 305,144 | $120M | 0.1% | 2026-Q1 |
| Duquesne Family Office LLC added | 122,000 | $118M | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 298,197 | $117M | 0.1% | 2026-Q1 |
| Palestra Capital Management LLC new | 294,000 | $115M | 0.1% | 2026-Q1 |
| Amanah Holdings Trust | 289,774 | $114M | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 268,866 | $105M | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 265,906 | $104M | 0.1% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 261,845 | $103M | 0.1% | 2026-Q1 |
| Ensign Peak Advisors, Inc added | 255,726 | $100M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 28,119,431 | $7.7B | 6.6% | 2025-Q4 stale |
| Egerton Capital (UK) LLP trimmed | 729,325 | $201M | 0.2% | 2025-Q4 stale |
| Slate Path Capital LP trimmed | 658,867 | $156M | 0.1% | 2025-Q3 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.