Ranked by reported Q1 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. | 14.3M | $5.59B | -11.4% | 6.546% | 0.10% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 14.2M | $5.55B | — | 6.491% | 0.14% |
| 3 | Sanders Capital, LLC | 12.9M | $5.05B | -24.9% | 5.914% | 6.02% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 11.1M | $4.35B | — | 5.088% | 0.23% |
| 5 | STATE STREET CORP | 9.3M | $3.66B | -0.5% | 4.274% | 0.13% |
| 6 | FMR LLC | 8.2M | $3.20B | +117.5% | 3.750% | 0.17% |
| 7 | Capital Research Global Investors | 5.7M | $2.25B | +27.1% | 2.630% | 0.35% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 5.1M | $1.98B | +3.4% | 2.321% | 0.12% |
| 9 | MORGAN STANLEY | 4.8M | $1.86B | -10.5% | 2.182% | 0.11% |
| 10 | WCM INVESTMENT MANAGEMENT, LLC | 4.3M | $1.58B | -15.7% | 1.993% | 3.60% |
| 11 | GOLDMAN SACHS GROUP INC | 3.7M | $1.45B | +26.6% | 1.701% | 0.17% |
| 12 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt | 3.6M | $1.42B | -33.2% | 1.660% | 1.39% |
| 13 | WELLS FARGO & COMPANY/MN | 3.5M | $1.39B | -0.5% | 1.627% | 0.30% |
| 14 | FRANKLIN RESOURCES INC | 3.5M | $1.38B | -12.6% | 1.613% | 0.34% |
| 15 | BANK OF AMERICA CORP /DE/ | 3.4M | $1.32B | -21.0% | 1.550% | 0.10% |
| 16 | CITADEL ADVISORS LLC | 3.3M | $1.31B | -21.9% | 1.528% | 0.61% |
| 17 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 3.3M | $1.30B | -13.6% | 1.519% | 0.15% |
| 18 | Invesco Ltd. | 2.6M | $1.02B | +0.8% | 1.198% | 0.16% |
| 19 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 2.5M | $1.01B | +26.3% | 1.163% | 0.34% |
| 20 | NORTHERN TRUST CORP | 1.9M | $743.2M | -0.2% | 0.870% | 0.10% |
| 21 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.8M | $706.9M | +36716.6% | 0.827% | 1.21% |
| 22 | DEUTSCHE BANK AG\ | 1.8M | $689.2M | +10.0% | 0.807% | 0.23% |
| 23 | UBS ASSET MANAGEMENT AMERICAS INC | 1.5M | $601.0M | +3.6% | 0.704% | 0.12% |
| 24 | Legal & General Group Plc | 1.5M | $593.4M | -0.6% | 0.695% | 0.14% |
| 25 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.4M | $561.6M | -55.1% | 0.657% | 0.30% |
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 Q1 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 |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,404 | +15% | 35.57% | +8.64 pp | $72.23B | +32% |
| Q4 2025 | 1,220 | +14% | 26.93% | +3.80 pp | $54.67B | +16% |
| Q3 2025 | 1,066 | +17% | 23.13% | +9.02 pp | $46.97B | +64% |
| Q2 2025 | 908 | +19% | 14.11% | +5.91 pp | $28.64B | +72% |
| Q1 2025 | 760 | 1.7% | 8.20% | +0.31 pp | $16.65B | +3.9% |
| Q4 2024 | 773 | 0.6% | 7.89% | 1.69 pp | $16.02B | 18% |
| Q3 2024 | 778 | +1.4% | 9.58% | +0.56 pp | $19.46B | +6.2% |
| Q2 2024 | 767 | — | 9.02% | — | $18.32B | — |
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 Q1 2026 13F filings, institutional ownership of Seagate Technology Holdings plc stands at 35.6%, held across 1,404 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of STX, with approximately 14,274,083 shares worth $5.59B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of STX, including CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for STX is 79 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
315 institutions opened new positions in STX during Q1 2026, while 131 fully exited. 941 added to existing positions and 144 trimmed.
STX institutional ownership rose by 8.64 percentage points quarter-over-quarter, with a net change of +184 holders.
The top 10 institutions account for 48.5% of all reported 13F value in STX, and the top 25 account for 70.0%.
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