Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in STX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 15.2M | $14.64B | +6.3% | 6.764% | 0.22% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 14.6M | $14.12B | +3.4% | 6.525% | 0.30% |
| 3 | STATE STREET CORP | 9.9M | $9.57B | +6.3% | 4.420% | 0.14% |
| 4 | FMR LLC | 8.2M | $7.87B | -0.3% | 3.636% | 0.34% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 8.0M | $7.72B | -27.9% | 3.568% | 0.35% |
| 6 | JANE STREET GROUP, LLC | 7.9M | $7.61B | +63.6% | 3.516% | 0.63% |
| 7 | Invesco Ltd. | 7.5M | $7.28B | +64.9% | 3.365% | 0.58% |
| 8 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 5.9M | $5.70B | +78.3% | 2.634% | 0.44% |
| 9 | WCM INVESTMENT MANAGEMENT, LLC | 5.3M | $5.15B | +22.4% | 2.373% | 9.34% |
| 10 | JPMORGAN CHASE & CO | 5.2M | $5.04B | -21.9% | 2.320% | 0.28% |
| 11 | CITADEL ADVISORS LLC | 5.2M | $4.99B | +55.0% | 2.304% | 0.28% |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 5.2M | $4.96B | +1.9% | 2.299% | 0.26% |
| 13 | MORGAN STANLEY | 4.7M | $4.56B | -0.8% | 2.105% | 0.24% |
| 14 | Capital Research Global Investors | 4.3M | $4.18B | -24.6% | 1.930% | 0.58% |
| 15 | GOLDMAN SACHS GROUP INC | 3.7M | $3.55B | -0.8% | 1.642% | 0.31% |
| 16 | WELLS FARGO & COMPANY/MN | 3.6M | $3.51B | +2.5% | 1.623% | 0.57% |
| 17 | Sanders Capital, LLC | 3.5M | $3.37B | -73.0% | 1.555% | 3.37% |
| 18 | NORGES BANK | 3.1M | $2.99B | — | 1.381% | 0.30% |
| 19 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 2.6M | $2.51B | +0.9% | 1.142% | 0.80% |
| 20 | WELLINGTON MANAGEMENT GROUP LLP | 2.4M | $2.33B | +2655.9% | 1.077% | 0.40% |
| 21 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.1M | $2.06B | +49.2% | 0.954% | 0.92% |
| 22 | BANK OF AMERICA CORP /DE/ | 2.1M | $2.04B | -37.4% | 0.943% | 0.13% |
| 23 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt | 2.1M | $2.03B | -41.8% | 0.940% | 1.56% |
| 24 | NORTHERN TRUST CORP | 1.9M | $1.84B | +0.3% | 0.848% | 0.21% |
| 25 | D. E. Shaw & Co., Inc. | 1.9M | $1.80B | +3.1% | 0.832% | 0.86% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in STX — a direct measure of their conviction.
Filings activity in STX during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 1,966 | +36% | 94.06% | +2.86 pp | $198.77B | +153% |
| Q1 2026 | 1,446 | +17% | 91.20% | 2.36 pp | $78.51B | +38% |
| Q4 2025 | 1,240 | +14% | 93.56% | +0.84 pp | $56.77B | +17% |
| Q3 2025 | 1,088 | +20% | 92.72% | +2.78 pp | $48.33B | +69% |
| Q2 2025 | 908 | +19% | 89.94% | +1.14 pp | $28.64B | +72% |
| Q1 2025 | 760 | 1.7% | 88.80% | +3.98 pp | $16.65B | +3.9% |
| Q4 2024 | 773 | 0.6% | 84.82% | +3.09 pp | $16.02B | 18% |
| Q3 2024 | 778 | — | 81.73% | — | $19.46B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying STX stock.
Based on Q2 2026 13F filings, institutional ownership of Seagate Technology Holdings plc stands at 94.1%, held across 1,966 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of STX, with approximately 15,166,793 shares worth $14.64B as of Q2 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of STX, including JANE STREET GROUP, LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for STX is 91 out of 100 (Strong Smart Money). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
551 institutions opened new positions in STX during Q2 2026, while 59 fully exited. 1,302 added to existing positions and 58 trimmed.
STX institutional ownership rose by 2.86 percentage points quarter-over-quarter, with a net change of +520 holders.
The top 10 institutions account for 42.6% of all reported 13F value in STX, and the top 25 account for 66.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Seagate Technology Holdings plc (STX) Institutional Ownership