Who owns Seagate (STX)?
144 holders named in SEC filings declare between 57.0% and 76.4% of Seagate's shares outstanding, as of Oct 1, 2026. The largest are Vanguard (10.9%), BlackRock (6.7%) and State Street (4.4%); the five largest hold 28.9% together. Another 1,805 institutions hold small positions worth 6.5%. At least 17.1% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 10.6% and sold 13.0% of the shares, a net sale of 2.4%; 525 opened a position, 594 added, 587 reduced and 58 sold out. Biggest buyers: Wellington (+2.3M shares) and Jane Street (+1.5M shares). Biggest sellers: Sanders Capital, LLC (-9.4M) and Vanguard (-2.5M). Schedule 13D/G filings since Mar 31, 2026: Sanders Capital, LLC fell below 5% (1.5% still declared) on Jun 30, 2026. Over time, 1,929 managers declared Seagate in their 13F for Q2 2026, against 596 for Q4 2019: together at most 83.6% of the shares outstanding, against 86.9%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| Vanguard | 13F | 10.9% | Jun 30, 2026 | Q4 2019 or earlier |
| BlackRock | 13F | 6.7% | Jun 30, 2026 | Q4 2019 or earlier |
| State Street | 13F | 4.4% | Jun 30, 2026 | Q4 2019 or earlier |
| Fidelity (FMR) | 13F | 3.6% | Jun 30, 2026 | Q4 2019 or earlier |
| Invesco | 13F | 3.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Capital Group | 13F | 2.4% | Jun 30, 2026 | Q3 2023 |
| WCM INVESTMENT MANAGEMENT, LLC | 13F | 2.3% | Jun 30, 2026 | Q3 2025 |
| JPMorgan | 13F | 2.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Geode Capital | 13F | 2.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Morgan Stanley | 13F | 2.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Sanders Capital, LLC | 13F | 1.5% | Jun 30, 2026 | Q3 2021 |
| Goldman Sachs | 13F | 1.5% | Jun 30, 2026 | Q4 2019 or earlier |
| Norges Bank | 13F | 1.4% | Jun 30, 2026 | Q4 2019 or earlier |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 13F | 1.1% | Jun 30, 2026 | Q3 2025 |
| Wellington | 13F | 1.1% | Jun 30, 2026 | Q1 2023 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 13F | 0.94% | Jun 30, 2026 | Q2 2025 |
| Bank of America | 13F | 0.93% | Jun 30, 2026 | Q4 2019 or earlier |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 13F | 0.93% | Jun 30, 2026 | Q3 2025 |
| Northern Trust | 13F | 0.84% | Jun 30, 2026 | Q4 2019 or earlier |
| Franklin Templeton | 13F | 0.79% | Jun 30, 2026 | Q4 2019 or earlier |
| Janus Henderson | 13F | 0.71% | Jun 30, 2026 | Q4 2019 or earlier |
| Deutsche Bank | 13F | 0.70% | Jun 30, 2026 | Q2 2022 |
| Legal & General | 13F | 0.68% | Jun 30, 2026 | Q4 2019 or earlier |
| Jane Street | 13F | 0.65% | Jun 30, 2026 | Q4 2019 or earlier |
| T. Rowe Price | 13F | 0.63% | Jun 30, 2026 | Q4 2019 or earlier |
Seagate institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 596 | 86.9% | $13.3B | 62.9% |
| Q4 2020 | 643 | 77.9% | $12.4B | 60.2% |
| Q4 2021 | 756 | 79.4% | $20.0B | 56.1% |
| Q4 2022 | 621 | 84.8% | $9.2B | 60.1% |
| Q4 2023 | 716 | 90.4% | $16.1B | 61.5% |
| Q4 2024 | 790 | 90.3% | $16.5B | 58.1% |
| Q4 2025 | 1,248 | 90.7% | $53.3B | 53.1% |
| Q2 2026 | 1,929 | 83.6% | $180.8B | 52.8% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.