STX
Seagate Technology PLC
921.50$
+0.5%
vs. previous close
Closing price · As of: Sep 28, 2026
Ownership
Ownership Structure
Who owns Seagate Technology PLC (STX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.3% of the shares are freely tradable; institutional investors hold 84.7%.
Institutional ownership
?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
84.7%
Insiders
?Share of the stock held by the executives, founders and major shareholders of the company itself.
0.2%
Float
?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
99.3%
Short % of float
?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
4.6%
Shares Outstanding
?Total number of shares issued. Price times share count gives market cap.
227Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.28 | 14,274,083 | -11.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.23 | 14,155,673 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.88 | 11,094,908 | +0.0 | 03/31/2026 |
| State Street Corp | 4.10 | 9,321,632 | -0.5 | 03/31/2026 |
| FMR Inc | 3.60 | 8,176,918 | +117.5 | 03/31/2026 |
| Amvescap Plc. | 3.16 | 7,176,698 | -2.4 | 03/31/2026 |
| JPMorgan Chase & Co | 2.93 | 6,659,239 | -4.8 | 03/31/2026 |
| Geode Capital Management, LLC | 2.23 | 5,060,828 | +3.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.13 | 7,125,704 | -0.2 | 08/31/2026 |
| Vanguard 500 Index Investor | 2.62 | 5,961,191 | +1.2 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Mosley William D | CEO | 378,108 | 348,426,752 $ | Sep 15, 2026 | direct |
| Romano Gianluca | EVP & CFO | 70,757 | 65,202,115 $ | Sep 15, 2026 | direct |
| Chong Kian Fatt | EVP Global Operations | 25,093 | 23,123,200 $ | Sep 14, 2026 | direct |
| Morris John Christopher | EVP & CTO | 22,853 | 21,059,270 $ | Sep 21, 2026 | direct |
| Teh Ban Seng | EVP & Chief Commercial Officer | 5,810 | 5,353,915 $ | Sep 15, 2026 | direct |
| Conyers Yolanda Lee | Director | 3,351 | 3,087,947 $ | Sep 1, 2026 | direct |
| Lee James CI | EVP & CLO | 1,107 | 1,020,101 $ | Aug 24, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 915 | 894.27 | 818,257 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 120 | 887.92 | 106,550 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 320 | 883.08 | 282,585 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 741 | 881.16 | 652,938 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 280 | 878.38 | 245,945 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 418 | 877.36 | 366,738 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 760 | 876.54 | 666,174 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 974 | 875.35 | 852,590 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 986 | 874.50 | 862,261 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 1,040 | 873.49 | 908,431 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 1,000 | 872.42 | 872,424 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 520 | 871.56 | 453,212 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 200 | 881.90 | 176,380 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 160 | 868.11 | 138,897 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 80 | 897.28 | 71,782 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Sell | 40 | 902.07 | 36,083 |
| Sep 21, 2026 | Morris John Christopher | EVP & CTO | Other | 915 | 158.40 | 144,936 |
| Sep 15, 2026 | Romano Gianluca | EVP & CFO | Sell | 49,984 | 772.16 | 38,595,510 |
| Sep 15, 2026 | Mosley William D | CEO | Sell | 97,889 | 772.14 | 75,584,326 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 2,480 | 800.47 | 1,985,166 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 400 | 799.03 | 319,611 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 530 | 797.97 | 422,925 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,587 | 796.90 | 1,264,673 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 2,166 | 795.95 | 1,724,018 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,280 | 794.72 | 1,017,238 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 560 | 791.36 | 443,164 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 280 | 788.43 | 220,760 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 120 | 787.26 | 94,471 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,040 | 786.14 | 817,588 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,000 | 784.45 | 784,446 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,760 | 789.84 | 1,390,119 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 4,147 | 782.56 | 3,245,295 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,600 | 781.35 | 1,250,157 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 2,453 | 780.29 | 1,914,063 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 6,682 | 779.27 | 5,207,051 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 7,259 | 778.35 | 5,650,017 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 3,987 | 777.22 | 3,098,765 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 3,242 | 776.20 | 2,516,430 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 2,315 | 775.01 | 1,794,159 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 1,717 | 774.01 | 1,328,982 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 3,451 | 772.65 | 2,666,428 |
| Sep 15, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 914 | 771.38 | 705,037 |
| Sep 15, 2026 | Morris John Christopher | EVP & CTO | Sell | 15,466 | 772.15 | 11,942,090 |
| Sep 14, 2026 | Romano Gianluca | EVP & CFO | Other | 90,380 | 0.00 | – |
| Sep 14, 2026 | Chong Kian Fatt | EVP Global Operations | Other | 14,470 | 0.00 | – |
| Sep 14, 2026 | Mosley William D | CEO | Other | 177,000 | 0.00 | – |
| Sep 14, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Other | 52,730 | 0.00 | – |
| Sep 14, 2026 | Morris John Christopher | EVP & CTO | Other | 30,130 | 0.00 | – |
| Sep 14, 2026 | Teh Ban Seng | EVP & Chief Commercial Officer | Sell | 989 | 779.00 | 770,431 |
| Sep 14, 2026 | Morris John Christopher | EVP & CTO | Sell | 493 | 781.23 | 385,148 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.