SEAGATE TECHNOLOGY HLDNGS PL (STX)
Institutional ownership reported to the SEC as of Q2 2026, across 32 quarters.
Institutions report 188,037,598 shares against 226,644,518 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $14.6B | 15,166,793 | 0.22% | 8q | +6.3%+$861.5M |
| VANGUARD CAPITAL MANAGEMENT LLC | $14.1B | 14,630,067 | 0.30% | 2q | +3.4%+$457.8M |
| STATE STREET CORP | $9.6B | 9,911,669 | 0.28% | 21q | +6.3%+$569.8M |
| FMR LLC | $7.9B | 8,153,134 | 0.34% | 21q | HELD |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $7.7B | 7,999,686 | 0.35% | 2q | -27.9%-$3.0B |
| JANE STREET GROUP, LLC | $7.6B incl. $6.2B options CALL+PUT | 1,473,813 | 0.63% | 21q | +7380.5%+$7.5B |
| Invesco Ltd. | $7.3B incl. $9.1M options CALL | 7,536,880 | 0.58% | 21q | +5.0%+$348.0M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $5.7B incl. $5.4B options CALL+PUT | 288,385 | 0.44% | 21q | +69.5%+$2.3B |
| WCM INVESTMENT MANAGEMENT, LLC | $5.2B | 5,320,463 | 9.34% | 4q | +22.4%+$943.0M |
| JPMORGAN CHASE & CO | $5.1B incl. $29.1M options PUT | 5,201,103 | 0.28% | 21q | -21.9%-$1.4B |
| CITADEL ADVISORS LLC | $5.0B incl. $4.3B options CALL+PUT | 755,495 | 0.57% | 21q | +582.2%+$4.3B |
| GEODE CAPITAL MANAGEMENT, LLC | $5.0B | 5,155,435 | 0.26% | 21q | +1.9%+$91.1M |
| MORGAN STANLEY | $4.6B | 4,720,524 | 0.24% | 21q | -0.8%-$37.4M |
| Capital Research Global Investors | $4.2B | 4,326,781 | 0.58% | 12q | -24.6%-$1.4B |
| GOLDMAN SACHS GROUP INC | $3.6B incl. $233.2M options CALL+PUT | 3,440,106 | 0.31% | 21q | -3.7%-$138.1M |
| WELLS FARGO & COMPANY/MN | $3.5B incl. $3.2B options CALL+PUT | 372,329 | 0.57% | 21q | +14.4%+$442.4M |
| Sanders Capital, LLC | $3.4B | 3,487,219 | 3.37% | 20q | -73.0%-$9.1B |
| NORGES BANK | $3.0B | 3,095,723 | 0.30% | 19q | +71.1%+$1.2B |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | $2.5B | 2,560,276 | 0.80% | 4q | +1.0%+$23.7M |
| WELLINGTON MANAGEMENT GROUP LLP | $2.3B | 2,414,136 | 0.40% | 14q | +2655.9%+$2.2B |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $2.1B | 2,138,429 | 0.92% | 5q | +49.2%+$680.3M |
| BANK OF AMERICA CORP /DE/ | $2.0B | 2,115,112 | 0.13% | 21q | -37.4%-$1.2B |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | $2.0B | 2,108,402 | 1.56% | 4q | -41.8%-$1.5B |
| NORTHERN TRUST CORP | $1.8B | 1,902,241 | 0.21% | 21q | HELD |
| D. E. Shaw & Co., Inc. | $1.8B incl. $493.3M options CALL+PUT | 1,354,377 | 0.86% | 21q | +5.0%+$86.1M |
| FRANKLIN RESOURCES INC | $1.7B | 1,798,079 | 0.38% | 21q | -48.9%-$1.7B |
| Jupiter Topco LLC | $1.6B | 1,608,436 | 0.63% | new | FIRST |
| DEUTSCHE BANK AG\ | $1.5B | 1,591,694 | 0.45% | 17q | -9.5%-$161.6M |
| Legal & General Group Plc | $1.5B | 1,530,731 | 0.31% | 21q | +1.1%+$15.6M |
| IMC-Chicago, LLC | $1.4B incl. $1.4B options CALL+PUT | 36,749 | 0.34% | 16q | +149.2%+$858.4M |
| PRICE T ROWE ASSOCIATES INC /MD/ | $1.4B | 1,430,343 | 0.14% | 21q | +13.7%+$165.9M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.3B | 1,352,030 | 0.17% | 21q | -0.9%-$12.4M |
| Bank of New York Mellon Corp | $1.2B | 1,286,208 | 0.20% | 21q | +21.5%+$219.9M |
| Amundi | $1.2B | 1,285,101 | 0.30% | 21q | +33.1%+$308.4M |
| AQR CAPITAL MANAGEMENT LLC | $1.2B | 1,245,371 | 0.42% | 21q | +24.4%+$235.8M |
| VANGUARD FIDUCIARY TRUST CO | $1.2B | 1,233,702 | 0.26% | 2q | +2.7%+$31.5M |
| EXCHANGE TRADED CONCEPTS, LLC | $1.1B | 1,152,676 | 5.08% | 11q | +3733.6%+$1.1B |
| ROYAL BANK OF CANADA | $1.1B incl. $65.4M options CALL | 1,044,994 | 0.16% | 21q | +3.1%+$32.4M |
| MILLENNIUM MANAGEMENT LLC | $1.1B incl. $442.2M options CALL+PUT | 633,069 | 0.38% | 21q | +152.9%+$636.7M |
| Capital International Investors | $995.9M | 1,032,054 | 0.21% | new | NEW |
| LONE PINE CAPITAL LLC | $965.1M | 1,000,109 | 5.90% | new | NEW |
| Polar Capital Holdings Plc | $949.9M | 984,377 | 2.24% | 5q | +5.4%+$48.7M |
| BNP PARIBAS FINANCIAL MARKETS | $939.8M incl. $482.5M options PUT | 473,888 | 0.33% | 7q | -19.7%-$231.3M |
| UBS Group AG | $925.0M incl. $114.5M options CALL+PUT | 839,966 | 0.12% | 21q | +32.8%+$228.3M |
| DIMENSIONAL FUND ADVISORS LP | $909.6M | 942,529 | 0.16% | 21q | +12.7%+$102.8M |
| Point72 Asset Management, L.P. | $854.6M incl. $60.5M options CALL+PUT | 822,914 | 0.94% | 8q | +50.6%+$287.2M |
| National Pension Service | $805.5M | 834,705 | 0.52% | 7q | +0.8%+$6.7M |
| Swedbank AB | $793.3M | 822,103 | 0.68% | 20q | +15.9%+$109.0M |
| Trivest Advisors Ltd | $712.0M | 737,780 | 22.38% | 4q | +254.7%+$511.2M |
| SANDS CAPITAL MANAGEMENT, LLC | $695.5M | 720,741 | 2.58% | 2q | +35.5%+$182.2M |
| Value Aligned Research Advisors, LLC | $684.6M incl. $96.5K options CALL | 709,357 | 1.71% | 3q | -22.4%-$198.1M |
| California Public Employees Retirement System | $673.7M | 698,149 | 0.38% | 21q | +93.7%+$325.9M |
| Russell Investments Group, Ltd. | $663.5M | 687,394 | 0.58% | 17q | -28.9%-$269.4M |
| BANK OF MONTREAL /CAN/ | $635.8M | 658,813 | 0.21% | 21q | -34.7%-$337.4M |
| CANADA PENSION PLAN INVESTMENT BOARD | $617.3M | 639,711 | 0.34% | 5q | -27.6%-$235.3M |
| Swiss National Bank | $594.5M | 616,040 | 0.31% | 21q | -3.7%-$22.5M |
| Nuveen, LLC | $584.7M | 605,858 | 0.14% | 6q | -21.5%-$159.7M |
| Atalan Capital Partners, LP | $552.9M | 573,000 | 33.92% | 5q | -20.3%-$140.7M |
| Mitsubishi UFJ Asset Management Co., Ltd. | $549.8M | 569,718 | 0.30% | 21q | +9.9%+$49.5M |
| BARCLAYS PLC | $548.4M | 568,334 | 0.11% | 18q | -15.2%-$97.9M |
| Qube Research & Technologies Ltd | $548.2M incl. $14.8M options CALL+PUT | 552,780 | 0.51% | 12q | +34043.3%+$546.6M |
| WT Asset Management Ltd | $545.0M | 564,716 | 10.78% | 4q | +15.3%+$72.3M |
| Sumitomo Mitsui Trust Group, Inc. | $536.9M | 556,378 | 0.31% | 17q | +6.5%+$32.8M |
| Castle Hook Partners LP | $527.2M | 546,287 | 2.42% | 5q | -2.7%-$14.8M |
| Winslow Capital Management, LLC | $498.9M | 517,006 | 1.72% | new | NEW |
| SG Americas Securities, LLC | $479.4M incl. $33.8M options CALL | 461,735 | 0.27% | new | NEW |
| Vanguard Global Advisers, LLC | $466.7M | 483,669 | 0.22% | 2q | +1.4%+$6.3M |
| FIRST TRUST ADVISORS LP | $466.6M | 483,514 | 0.27% | 21q | -9.9%-$51.3M |
| Sachem Head Capital Management LP | $455.5M | 472,000 | 9.45% | new | NEW |
| Walleye Trading LLC | $448.3M incl. $442.0M options CALL+PUT | 6,529 | 0.51% | 21q | -18.1%-$99.1M |
| Holocene Advisors, LP | $444.1M | 460,184 | 1.00% | 19q | -57.7%-$605.5M |
| CITIGROUP INC | $441.8M | 457,832 | 0.15% | 21q | +36.0%+$117.0M |
| RENAISSANCE TECHNOLOGIES LLC | $441.3M | 457,353 | 0.61% | 9q | +47.3%+$141.7M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $434.1M | 449,904 | 0.44% | 3q | +3.9%+$16.1M |
| ACADIAN ASSET MANAGEMENT LLC | $432.2M | 447,945 | 0.51% | 21q | -25.9%-$151.4M |
| VOYA INVESTMENT MANAGEMENT LLC | $427.1M | 442,630 | 0.37% | 17q | +248.5%+$304.6M |
| VANGUARD ASSET MANAGEMENT, Ltd | $417.9M | 433,011 | 0.28% | 2q | +15.1%+$54.7M |
| HSBC HOLDINGS PLC | $402.4M incl. $661.3K options CALL | 418,762 | 0.17% | 20q | +10.6%+$38.7M |
| ENVESTNET ASSET MANAGEMENT INC | $384.4M | 398,344 | 0.09% | 21q | +30.5%+$89.9M |
| Palestra Capital Management LLC | $372.6M | 386,123 | 12.63% | 2q | +31.3%+$88.9M |
| TWO SIGMA INVESTMENTS, LP | $364.5M incl. $22.1M options CALL+PUT | 354,816 | 0.26% | 12q | +246.1%+$259.2M |
| AMERIPRISE FINANCIAL INC | $355.9M | 368,748 | 0.07% | 21q | -14.0%-$58.1M |
| Allianz Asset Management GmbH | $345.1M incl. $51.5M options CALL+PUT | 304,216 | 0.28% | 21q | +33.8%+$87.2M |
| RAYMOND JAMES FINANCIAL INC | $336.7M | 348,962 | 0.09% | 7q | -9.4%-$35.1M |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $316.7M | 328,233 | 0.29% | 21q | +6.8%+$20.2M |
| CACTI ASSET MANAGEMENT LLC | $316.4M | 327,925 | 15.87% | 31q | -37.7%-$191.1M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $306.0M | 317,585 | 0.36% | 9q | +2.0%+$5.9M |
| Quadrature Capital Ltd | $302.6M | 313,545 | 2.59% | 2q | +221.3%+$208.4M |
| HRT FINANCIAL LP | $291.7M incl. $2.1M options OPT | 302,293 | 0.53% | 2q | +27.1%+$62.2M |
| Maple Rock Capital Partners Inc. | $290.6M | 301,162 | 5.70% | 9q | -43.6%-$224.7M |
| Alyeska Investment Group, L.P. | $281.2M | 291,439 | 0.72% | 3q | +133.0%+$160.5M |
| Amanah Holdings Trust | $279.6M | 289,774 | 16.42% | 3q | HELD |
| TIGER GLOBAL MANAGEMENT LLC | $275.1M | 285,100 | 1.15% | new | NEW |
| TD Asset Management Inc | $273.6M | 283,546 | 0.24% | 21q | +143.2%+$161.1M |
| Anther Capital Ltd | $273.5M | 283,416 | 7.00% | 2q | -14.4%-$46.1M |
| Ensign Peak Advisors, Inc | $263.4M | 272,913 | 0.43% | 21q | +6.7%+$16.6M |
| Clearbridge Investments, LLC | $263.2M | 272,765 | 0.22% | 21q | +8510.0%+$260.2M |
| Balyasny Asset Management L.P. | $258.1M incl. $10.9M options CALL+PUT | 256,151 | 0.32% | 8q | -35.3%-$141.0M |
| SIMPLEX TRADING, LLC | $257.3M incl. $256.6M options CALL+PUT | 699 | 0.15% | 2q | -73.1%-$699.3M |
| NATIXIS ADVISORS, LLC | $256.9M | 266,259 | 0.29% | 21q | +24.4%+$50.4M |
Showing the largest 100 of 1,992 reported holders. The count of 1,989 above leaves out 3 positions whose reported value failed our price check; they are listed here as filed.
Q2 2026 in brief
In Q2 2026, 1,989 managers that file Form 13F reported holding Seagate Technology Hldngs Pl (STX), $205.8B in all, or about 83% of the shares outstanding. 585 managers opened a position and 81 sold out completely, against 1,485 holders the quarter before. Largest holders: Blackrock, Inc., Vanguard Capital Management Llc and State Street Corp. Largest new positions: Capital International Investors ($995.9M), Lone Pine Capital Llc ($965.1M) and Winslow Capital Management, Llc ($498.9M).
Q2 2026 is the latest quarter whose 13F deadline has passed. A 13F shows long US stock positions at quarter end, filed up to 45 days later; an adviser and a sub-adviser can both report the same shares.
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-09-04 | 2026-09-02 | Directors or officers departed or appointed | filing |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-15 | MOSLEY WILLIAM D | CEO | Sold | 97,889 | $75.6M |
| 2026-09-15 | Teh Ban Seng | EVP & Chief Commercial Officer | Sold | 52,730 | $41.2M ×24 |
| 2026-09-15 | Romano Gianluca | EVP & CFO | Sold | 49,984 | $38.6M |
| 2026-09-11 | Romano Gianluca | EVP & CFO | Sold | 45,898 | $38.1M ×24 |
| 2026-09-01 | MOSLEY WILLIAM D | CEO | Sold | 30,000 | $24.5M ×26 |
| 2026-05-20 | MOSLEY WILLIAM D | CEO | Sold | 30,000 | $22.5M ×19 |
| 2026-07-01 | MOSLEY WILLIAM D | CEO | Sold | 20,657 | $18.8M ×29 |
| 2026-10-01 | MOSLEY WILLIAM D | CEO | Sold | 18,998 | $17.4M ×28 |
| 2026-08-21 | MOSLEY WILLIAM D | CEO | Sold | 18,138 | $15.4M ×3 |
| 2026-06-01 | MOSLEY WILLIAM D | CEO | Sold | 16,220 | $14.6M ×29 |
| 2026-08-03 | MOSLEY WILLIAM D | CEO | Sold | 17,080 | $14.1M ×19 |
| 2026-06-01 | MOSLEY WILLIAM D | CEO | Sold | 13,780 | $12.7M ×20 |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 725 | $7.3B | 7,941,660 | 55 | 246 | 267 | 0.1% |
| Q2 2026 | 1,989 | $205.8B | 188,037,598 | 568 | 612 | 591 | 12.0% |
| Q1 2026 | 1,485 | $81.9B | 190,209,776 | 299 | 466 | 492 | 9.4% |
| Q4 2025 | 1,293 | $60.0B | 194,686,950 | 191 | 419 | 397 | 10.7% |
| Q3 2025 | 1,140 | $53.3B | 208,162,564 | 267 | 353 | 315 | 7.9% |
| Q2 2025 | 971 | $30.9B | 200,835,625 | 230 | 297 | 271 | 6.1% |
| Q1 2025 | 812 | $17.8B | 199,331,848 | 96 | 262 | 271 | 4.9% |
| Q4 2024 | 815 | $17.4B | 191,904,106 | 64 | 312 | 240 | 4.5% |
| Q3 2024 | 831 | $24.1B | 209,064,318 | 97 | 286 | 254 | 4.9% |
| Q2 2024 | 808 | $22.9B | 209,863,736 | 98 | 274 | 245 | 5.2% |
| Q1 2024 | 779 | $21.0B | 214,415,240 | 100 | 225 | 260 | 5.0% |
| Q4 2023 | 741 | $19.0B | 211,977,148 | 111 | 192 | 262 | 4.6% |
| Q3 2023 | 664 | $13.1B | 186,715,559 | 61 | 186 | 228 | 6.3% |
| Q2 2023 | 666 | $11.6B | 177,952,561 | 53 | 173 | 257 | 4.6% |
| Q1 2023 | 682 | $13.5B | 193,525,934 | 104 | 201 | 200 | 5.0% |
| Q4 2022 | 650 | $10.2B | 178,507,342 | 76 | 190 | 251 | 7.6% |
| Q3 2022 | 651 | $20.7B | 330,824,562 | 57 | 196 | 241 | 3.2% |
| Q2 2022 | 706 | $23.3B | 315,476,931 | 111 | 199 | 234 | 3.1% |
| Q1 2022 | 693 | $27.7B | 301,264,938 | 69 | 188 | 271 | 2.2% |
| Q4 2021 | 798 | $41.0B | 349,124,071 | 119 | 201 | 274 | 3.8% |
| Q3 2021 | 691 | $33.4B | 392,680,850 | 101 | 237 | 196 | 3.1% |
| Q2 2021 | 681 | $29.0B | 312,612,550 | 646 | 10 | 16 | 5.3% |
| Q1 2021 | 676 | $34.2B | 438,592,287 | 81 | 173 | 267 | 1.7% |
| Q4 2020 | 675 | $40.1B | 763,239,315 | 106 | 163 | 241 | 1.9% |
| Q3 2020 | 585 | $24.3B | 788,764,559 | 59 | 199 | 206 | 2.2% |
| Q2 2020 | 611 | $26.2B | 1,015,231,348 | 84 | 215 | 192 | 1.8% |
| Q1 2020 | 591 | $28.0B | 720,375,393 | 76 | 182 | 216 | 1.5% |
| Q4 2019 | 628 | $29.1B | 663,449,229 | 74 | 180 | 208 | 2.5% |
| Q3 2019 | 572 | $29.5B | 534,931,043 | 75 | 151 | 206 | 2.6% |
| Q2 2019 | 572 | $23.6B | 465,402,747 | 74 | 178 | 199 | 3.7% |
| Q1 2019 | 577 | $19.2B | 389,201,523 | 84 | 151 | 225 | 3.2% |
| Q4 2018 | 561 | $25.3B | 641,967,213 | 9 | 13 | 15 | 2.6% |