STX Seagate Technology plc
Seagate Technology plc (STX) Institutional Ownership
What the institutions did with STX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended September 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeOwnership map
Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| FMR LLC | 11.5M | 23.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 6.0M | 12.5% |
| Aberdeen Group plc | 3.8M | 7.8% |
| Sanders Capital, LLC | 3.5M | 7.2% |
| Amundi | 1.6M | 3.2% |
| EXCHANGE TRADED CONCEPTS, LLC | 1.4M | 2.8% |
| Bank of New York Mellon Corp | 1.3M | 2.8% |
| DEUTSCHE BANK AG\ | 1.1M | 2.2% |
| DIMENSIONAL FUND ADVISORS LP | 1.0M | 2.1% |
| Nuveen, LLC | 967.2K | 2.0% |
| Swedbank AB | 905.0K | 1.9% |
| Russell Investments Group, Ltd. | 748.8K | 1.6% |
| BANK OF MONTREAL /CAN/ | 741.6K | 1.5% |
| BARCLAYS PLC | 680.2K | 1.4% |
| Mitsubishi UFJ Asset Management Co., Ltd. | 614.3K | 1.3% |
| Sumitomo Mitsui Trust Group, Inc. | 545.7K | 1.1% |
| CITIGROUP INC | 479.9K | 1.0% |
| MACKENZIE FINANCIAL CORP | 372.3K | 0.8% |
| WT Asset Management Ltd | 355.1K | 0.7% |
| ACADIAN ASSET MANAGEMENT LLC | 293.8K | 0.6% |
| DekaBank Deutsche Girozentrale | 285.5K | 0.6% |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 277.0K | 0.6% |
| LPL Financial LLC | 272.4K | 0.6% |
| CACTI ASSET MANAGEMENT LLC | 271.6K | 0.6% |
| ProShare Advisors LLC | 265.2K | 0.5% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Aberdeen Group plc | Increased | 202.9K | 3.8M | +3.6M |
| FMR LLC | Increased | 8.2M | 11.5M | +3.3M |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 5.2M | 6.0M | +867.2K |
| Trivest Advisors Ltd | Reduced | 737.8K | 189.5K | -548.3K |
| DEUTSCHE BANK AG\ | Reduced | 1.6M | 1.1M | -512.4K |
| Nuveen, LLC | Increased | 605.9K | 967.2K | +361.4K |
| Amanah Holdings Trust | Sold Out | 289.8K | 0 | -289.8K |
| Amundi | Increased | 1.3M | 1.6M | +282.9K |
| DekaBank Deutsche Girozentrale | Increased | 37.1K | 285.5K | +248.4K |
| EXCHANGE TRADED CONCEPTS, LLC | Increased | 1.2M | 1.4M | +216.0K |
| WT Asset Management Ltd | Reduced | 564.7K | 355.1K | -209.6K |
| ING GROEP NV | Reduced | 191.5K | 24.8K | -166.6K |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | 447.9K | 293.8K | -154.1K |
| MACKENZIE FINANCIAL CORP | Increased | 249.5K | 372.3K | +122.9K |
| BARCLAYS PLC | Increased | 568.3K | 680.2K | +111.9K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 942.5K | 1.0M | +88.8K |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Increased | 190.8K | 277.0K | +86.1K |
| Swedbank AB | Increased | 822.1K | 905.0K | +82.9K |
| BANK OF MONTREAL /CAN/ | Increased | 658.8K | 741.6K | +82.8K |
| KBC Group NV | Reduced | 155.5K | 73.2K | -82.2K |
| Swiss Life Asset Management Ltd | New | 0 | 76.1K | +76.1K |
| BRAUN STACEY ASSOCIATES INC | New | 0 | 68.3K | +68.3K |
| Pictet Asset Management Holding SA | Increased | 139.1K | 203.7K | +64.5K |
| Russell Investments Group, Ltd. | Increased | 687.4K | 748.8K | +61.4K |
| Calamos Advisors LLC | Increased | 27.4K | 87.6K | +60.2K |
| CACTI ASSET MANAGEMENT LLC | Reduced | 327.9K | 271.6K | -56.3K |
| M&G PLC | Increased | 139.5K | 193.7K | +54.2K |
| Bank of New York Mellon Corp | Increased | 1.3M | 1.3M | +51.3K |
| Allspring Global Investments Holdings, LLC | Increased | 122.1K | 170.7K | +48.5K |
| Fideuram Asset Management (Ireland) dac | Reduced | 62.0K | 16.7K | -45.3K |
| Mitsubishi UFJ Asset Management Co., Ltd. | Increased | 569.7K | 614.3K | +44.6K |
| Central Asset Investments & Management Holdings (HK) Ltd | Reduced | 60.1K | 22.7K | -37.4K |
| IMC-Chicago, LLC | Sold Out | 36.7K | 0 | -36.7K |
| Cambridge Investment Research Advisors, Inc. | Reduced | 71.1K | 35.6K | -35.4K |
| GF FUND MANAGEMENT CO. LTD. | Reduced | 121.6K | 87.0K | -34.6K |
| Jefferies Financial Group Inc. | Increased | 60.3K | 89.1K | +28.8K |
| Ariose Capital Management Ltd | Sold Out | 27.6K | 0 | -27.6K |
| NEOS Investment Management LLC | Increased | 166.4K | 192.7K | +26.3K |
| Squarepoint Ops LLC | Increased | 63.9K | 89.2K | +25.4K |
| AEGON ASSET MANAGEMENT UK Plc | Increased | 3.6K | 28.9K | +25.3K |
| LBP AM SA | Reduced | 67.3K | 42.3K | -25.1K |
| Cullen/Frost Bankers, Inc. | Increased | 118 | 24.9K | +24.8K |
| DYMON ASIA CAPITAL (SINGAPORE) PTE. LTD. | Increased | 35.2K | 59.1K | +23.9K |
| J. Safra Sarasin Holding AG | Increased | 5.7K | 28.9K | +23.1K |
| ASSETMARK, INC | Increased | 15.4K | 38.3K | +22.9K |
| CITIGROUP INC | Increased | 457.8K | 479.9K | +22.0K |
| Indivisible Partners | Reduced | 43.3K | 22.3K | -21.0K |
| AustralianSuper Pty Ltd | Reduced | 120.3K | 99.9K | -20.4K |
| Chicago Capital, LLC | Increased | 64.3K | 84.1K | +19.8K |
| LPL Financial LLC | Increased | 252.9K | 272.4K | +19.5K |
| FACTORY MUTUAL INSURANCE CO | New | 0 | 18.7K | +18.7K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 249.5K | 231.4K | -18.1K |
| Temasek Holdings (Private) Ltd | Reduced | 22.4K | 5.6K | -16.8K |
| COMMONWEALTH EQUITY SERVICES, LLC | Reduced | 67.7K | 52.1K | -15.7K |
| DANSKE BANK A/S | Increased | 128.9K | 144.0K | +15.0K |
| Y-Intercept (Hong Kong) Ltd | Increased | 10.2K | 25.0K | +14.8K |
| TB Alternative Assets Ltd. | Sold Out | 14.7K | 0 | -14.7K |
| Prospera Financial Services Inc | Reduced | 22.0K | 7.5K | -14.6K |
| MIZUHO MARKETS AMERICAS LLC | Increased | 14.1K | 28.5K | +14.3K |
| CIBC Asset Management Inc | Increased | 115.2K | 129.1K | +14.0K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.