Seagate Technology Holdings plc (STX) Ownership
STX ownership summary
as of October 18, 2026- Institutions
- 84.6% of shares outstanding
- Insiders
- 0.30% of shares outstanding
- Shares outstanding
- 227.4M
- Float
- 225.9M shares available to trade
- Short interest
- 3.07% 7.0M shares short
- Days to cover
- 1.88 short interest down 23.6% vs prior month
- Institutions 84.59%
- Insiders 0.30%
- Other investors 15.11%
STX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 6.67% | 15.2M | $9.69B | +892,710 (+6.3%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.43% | 14.6M | $9.35B | +474,394 (+3.4%) | June 30, 2026 |
| 3 | State Street Corp | 4.36% | 9.9M | $6.33B | +590,037 (+6.3%) | June 30, 2026 |
| 4 | FMR Inc | 3.59% | 8.2M | $5.21B | −23,784 (−0.3%) | June 30, 2026 |
| 5 | Vanguard Portfolio Management, LLC | 3.52% | 8.0M | $5.11B | −3.1M (−27.9%) | June 30, 2026 |
| 6 | Amvescap Plc. | 3.31% | 7.5M | $4.82B | +360,182 (+5.0%) | June 30, 2026 |
| 7 | WCM Investment Management | 2.34% | 5.3M | $3.40B | +973,611 (+22.4%) | June 30, 2026 |
| 8 | JPMorgan Chase & Co | 2.29% | 5.2M | $3.32B | −1.5M (−21.9%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 2.27% | 5.2M | $3.29B | +94,607 (+1.9%) | June 30, 2026 |
| 10 | Morgan Stanley - Brokerage Accounts | 2.08% | 4.7M | $3.02B | −38,788 (−0.8%) | June 30, 2026 |
| 11 | Capital Research Global Investors | 1.90% | 4.3M | $2.76B | −1.4M (−24.6%) | June 30, 2026 |
| 12 | Sanders Capital, LLC | 1.53% | 3.5M | $2.23B | −9.4M (−73.0%) | June 30, 2026 |
| 13 | The Goldman Sachs Group Inc | 1.51% | 3.4M | $2.20B | −133,684 (−3.7%) | June 30, 2026 |
| 14 | NORGES BANK | 1.36% | 3.1M | $1.98B | +1.3M (+71.1%) | June 30, 2026 |
| 15 | Massachusetts Financial Services Company | 1.13% | 2.6M | $1.64B | +24,154 (+1.0%) | June 30, 2026 |
| 16 | Wellington Management Company LLP | 1.06% | 2.4M | $1.54B | +2.3M (+2,655.9%) | June 30, 2026 |
| 17 | Arrowstreet Capital Limited Partnership | 0.94% | 2.1M | $1.37B | +704,934 (+49.2%) | June 30, 2026 |
| 18 | Bank of America Corp | 0.93% | 2.1M | $1.35B | −1.3M (−37.4%) | June 30, 2026 |
| 19 | DZ BANK AG Deutsche Zentral-Genossenschaftsbank Frankfurt am Main | 0.93% | 2.1M | $1.35B | −1.5M (−41.8%) | June 30, 2026 |
| 20 | Northern Trust Corp | 0.84% | 1.9M | $1.22B | +5,248 (+0.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 11 holders added 7.7M shares and 9 cut 18.3M.
STX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.13% | 7.1M | $4.55B | −14,340 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.62% | 6.0M | $3.80B | −7,520 (−0.1%) | September 30, 2026 |
| 3 | Invesco QQQ Trust | 2.08% | 4.7M | $3.03B | −7,722 (−0.2%) | September 30, 2026 |
| 4 | iShares Core S&P 500 ETF | 1.33% | 3.0M | $1.93B | −4,847 (−0.2%) | September 30, 2026 |
| 5 | Fidelity 500 Index | 1.28% | 2.9M | $1.86B | +11,179 (+0.4%) | August 31, 2026 |
| 6 | State Street® SPDR® S&P 500® ETF | 1.22% | 2.8M | $1.78B | — | September 30, 2026 |
| 7 | Vanguard MStar Growth Index Investor | 1.08% | 2.5M | $1.57B | +82,017 (+3.5%) | September 30, 2026 |
| 8 | State Street®TechSelSectSPDR®ETF | 0.72% | 1.6M | $1.05B | +1,008 (+0.1%) | September 30, 2026 |
| 9 | Vanguard Information Technology ETF | 0.67% | 1.5M | $972.7M | +3,503 (+0.2%) | September 30, 2026 |
| 10 | WCM Focused International Growth Instl | 0.60% | 1.4M | $867.1M | −7,280 (−0.5%) | September 30, 2026 |
| 11 | Roundhill Memory ETF | 0.59% | 1.3M | $857.2M | −6,479 (−0.5%) | September 30, 2026 |
| 12 | Vanguard Institutional Index I | 0.53% | 1.2M | $766.1M | +198 (+0.0%) | September 30, 2026 |
| 13 | American Funds Growth Fd of Amer A | 0.51% | 1.2M | $747.2M | +601,964 (+106.1%) | September 30, 2026 |
| 14 | Invesco NASDAQ 100 ETF | 0.46% | 1.0M | $665.9M | +2,436 (+0.2%) | September 30, 2026 |
| 15 | JPMorgan Nasdaq Equity Premium Inc ETF | 0.37% | 843K | $538.9M | +2,900 (+0.3%) | September 30, 2026 |
| 16 | American Funds Invmt Co of Amer A | 0.36% | 827K | $528.5M | −35,935 (−4.2%) | September 30, 2026 |
| 17 | American Funds Cptl Wld Gr&Inc A | 0.35% | 806K | $515.3M | +277,437 (+52.5%) | September 30, 2026 |
| 18 | Fidelity Magellan | 0.35% | 802K | $512.2M | +99,100 (+14.1%) | August 31, 2026 |
| 19 | Polar Capital Global Tech Inc | 0.33% | 740K | $473.1M | +58,474 (+8.6%) | August 31, 2026 |
| 20 | Vanguard Wellington Inv | 0.32% | 738K | $471.7M | +738,160 (0.0%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
STX insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-01 | William D Mosley | Sell | $420.73 | 20,000 | $8.4M |
| 2026-03-19 | William D Mosley | Sell | $406.77 | 24,584 | $10.0M |
| 2026-03-02 | William D Mosley | Sell | $384.76 | 20,000 | $7.7M |
| 2026-02-23 | Kian Fatt Chong | Sell | $416.48 | 5,846 | $2.4M |
| 2026-02-05 | Ro Khanna | Sell | $405.45 | — | — |
| 2026-02-02 | William D Mosley | Sell | $429.27 | 20,000 | $8.6M |
| 2026-01-30 | Jay L Geldmacher | Sell | $448.02 | 925 | $414,418 |
| 2026-01-29 | Ban Seng Teh | Sell | $442.29 | 20,195 | $8.9M |
| 2026-01-26 | James Ci Lee | Sell | $348.85 | 673 | $234,776 |
| 2026-01-12 | Ban Seng Teh | Sell | $299.31 | 1,412 | $422,626 |
| 2026-01-02 | William D Mosley | Sell | $285.56 | 20,000 | $5.7M |
| 2025-12-18 | Julie Johnson | Sell | $292.00 | — | — |
| 2025-12-02 | Yolanda Lee Conyers | Sell | $272.91 | 750 | $204,683 |
| 2025-12-01 | William D Mosley | Sell | $271.03 | 20,000 | $5.4M |
| 2025-11-13 | Julie Johnson | Sell | $262.56 | — | — |
| 2025-11-12 | Gianluca Romano | Sell | $285.16 | 54,021 | $15.4M |
| 2025-11-05 | Ban Seng Teh | Sell | $270.00 | 6,000 | $1.6M |
| 2025-11-03 | Stephanie Tilenius | Sell | $266.41 | 2,046 | $545,075 |
| 2025-11-03 | William D Mosley | Sell | $262.82 | 20,000 | $5.3M |
| 2025-10-31 | Jay L Geldmacher | Sell | $269.10 | 1,250 | $336,375 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
STX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns STX
Institutional investors own 84.6% of Seagate's shares and insiders 0.30%. The largest holder is BlackRock Inc with 6.67% of the shares (15.2M), as of June 30, 2026. Among the top 20 institutions, 11 added shares and 9 reduced their stake in the latest filings. Short interest is 3.07% of the float, or 1.88 days of average trading volume. The share count fell 32.4% since 2014.
Related: STX analyst forecast, STX key metrics, STX dividend history. See the STX stock overview for the latest quote and news.
STX ownership FAQ
Who owns the most Seagate stock?
The largest shareholders of Seagate are BlackRock Inc (6.67%), Vanguard Capital Management, LLC (6.43%), State Street Corp (4.36%), FMR Inc (3.59%), Vanguard Portfolio Management, LLC (3.52%).
What percentage of Seagate is owned by institutions?
Institutions hold 84.6% of Seagate's shares outstanding; insiders hold 0.30%.
Which funds own Seagate?
The largest fund holders of Seagate are Vanguard MStar Total Stk Mkt Idx Invest (3.13%), Vanguard 500 Index Investor (2.62%), Invesco QQQ Trust (2.08%), iShares Core S&P 500 ETF (1.33%), Fidelity 500 Index (1.28%).
What is Seagate's short interest?
7.0M shares of Seagate were sold short, 3.07% of the float; at the average daily volume it would take 1.88 days to cover.
Are insiders buying or selling Seagate?
Of the latest 20 reported insider transactions in Seagate (since October 31, 2025), 0 were purchases and 20 were sales.
How many shares of Seagate are outstanding?
Seagate has 227.4M shares outstanding, of which 225.9M are in the public float.