Seagate Technology Holdings plc (STX) insider trading.
In Q3 2026, insiders at Seagate Technology Holdings plc reported 432 non-derivative transactions on 38 Forms 3, 4 and 5: 0 open-market purchases and 379 sales worth $379.1M.
- Transactions
- 432
- Purchases (P)
- 0
- Sales (S)
- 379
- Net shares, P minus S
- -467,501
- Insiders
- 7
- Last filed
- 2026-09-22
Insiders
| Insider | Relationship | Transactions | Buys | Sales |
|---|---|---|---|---|
| Mosley William D | Director, Officer · CEO | 135 | 0 | 125 |
| Romano Gianluca | Officer · EVP & CFO | 121 | 0 | 110 |
| Teh Ban Seng | Officer · EVP & Chief Commercial Officer | 85 | 0 | 74 |
| Morris John Christopher | Officer · EVP & CTO | 44 | 0 | 35 |
| Lee James CI | Officer · EVP & CLO | 39 | 0 | 34 |
| Chong Kian Fatt | Officer · EVP Global Operations | 7 | 0 | 0 |
| Conyers Yolanda Lee | Director | 1 | 0 | 1 |
Transactions
| Date | Insider | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-09-21 | Morris John Christopher | M (A) | 915 | $158.4 | 32,047 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $902.07 | 22,693 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $899.53 | 22,733 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $863.66 | 32,007 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 80 | $865.11 | 31,927 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $865.8 | 31,887 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 160 | $868.11 | 31,727 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 80 | $869.21 | 31,647 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 200 | $870.28 | 31,447 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 520 | $871.56 | 30,927 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 1,000 | $872.42 | 29,927 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 1,040 | $873.49 | 28,887 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 986 | $874.5 | 27,901 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 974 | $875.35 | 26,927 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 760 | $876.54 | 26,167 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 418 | $877.36 | 25,749 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 280 | $878.38 | 25,469 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 200 | $879.71 | 25,269 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 741 | $881.16 | 24,528 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 200 | $881.9 | 24,328 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 320 | $883.08 | 24,008 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $886.27 | 23,968 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 120 | $887.92 | 23,848 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $890.54 | 23,808 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 40 | $893.15 | 23,768 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 915 | $894.27 | 22,853 | Form 4 |
| 2026-09-21 | Morris John Christopher | S (D) | 80 | $897.28 | 22,773 | Form 4 |
| 2026-09-15 | Morris John Christopher | S (D) | 15,466 | $772.15 | 31,132 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,587 | $796.9 | 9,220 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 2,166 | $795.95 | 10,807 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 2,480 | $800.47 | 5,810 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 914 | $771.38 | 57,626 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 3,451 | $772.65 | 54,175 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 530 | $797.97 | 8,690 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,717 | $774.01 | 52,458 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 2,315 | $775.01 | 50,143 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 3,242 | $776.2 | 46,901 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 3,987 | $777.22 | 42,914 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 7,259 | $778.35 | 35,655 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 6,682 | $779.27 | 28,973 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 2,453 | $780.29 | 26,520 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,600 | $781.35 | 24,920 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 4,147 | $782.56 | 20,773 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,760 | $783.28 | 19,013 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,000 | $784.45 | 18,013 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,040 | $786.14 | 16,973 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 120 | $787.26 | 16,853 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 280 | $788.43 | 16,573 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,760 | $789.84 | 14,813 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 560 | $791.36 | 14,253 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 1,280 | $794.72 | 12,973 | Form 4 |
| 2026-09-15 | Teh Ban Seng | S (D) | 400 | $799.03 | 8,290 | Form 4 |
| 2026-09-15 | Mosley William D | S (D) | 97,889 | $772.14 | 378,108 | Form 4 |
| 2026-09-15 | Romano Gianluca | S (D) | 49,984 | $772.16 | 70,757 | Form 4 |
| 2026-09-14 | Morris John Christopher | M (A) | 30,130 | $0 | 46,598 | Form 4 |
| 2026-09-14 | Teh Ban Seng | M (A) | 52,730 | $0 | 58,540 | Form 4 |
| 2026-09-14 | Mosley William D | M (A) | 177,000 | $0 | 475,998 | Form 4 |
| 2026-09-14 | Chong Kian Fatt | M (A) | 14,470 | $0 | 25,093 | Form 4 |
| 2026-09-14 | Romano Gianluca | M (A) | 90,380 | $0 | 120,740 | Form 4 |
| 2026-09-14 | Mosley William D | S (D) | 1,870 | $781.23 | 298,998 | Form 4 |
| 2026-09-14 | Romano Gianluca | S (D) | 955 | $781.24 | 30,360 | Form 4 |
| 2026-09-14 | Morris John Christopher | S (D) | 493 | $781.23 | 16,468 | Form 4 |
| 2026-09-14 | Teh Ban Seng | S (D) | 989 | $779 | 5,810 | Form 4 |
| 2026-09-11 | Mosley William D | M (A) | 3,319 | $0 | 300,867 | Form 4 |
| 2026-09-11 | Romano Gianluca | M (A) | 8,517 | $68.83 | 38,137 | Form 4 |
| 2026-09-11 | Romano Gianluca | M (A) | 13,475 | $101.34 | 66,679 | Form 4 |
| 2026-09-11 | Romano Gianluca | M (A) | 15,067 | $64.31 | 53,204 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 360 | $843.55 | 34,220 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 280 | $842.23 | 34,580 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 320 | $841.05 | 34,860 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,000 | $840.12 | 35,180 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 880 | $839.15 | 36,180 | Form 4 |
| 2026-09-11 | Romano Gianluca | M (A) | 13,439 | $158.4 | 80,118 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 200 | $838.1 | 37,060 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 480 | $836.92 | 37,260 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,320 | $835.67 | 37,740 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,440 | $834.8 | 39,060 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 2,080 | $833.67 | 40,500 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 4,220 | $832.68 | 42,580 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 4,589 | $831.71 | 46,800 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 7,568 | $830.74 | 51,389 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 5,593 | $829.77 | 58,957 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 3,321 | $828.84 | 64,550 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,727 | $827.72 | 67,871 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,840 | $826.72 | 69,598 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 800 | $825.65 | 71,438 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,040 | $819.39 | 79,078 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,320 | $820.54 | 77,758 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,550 | $821.42 | 76,208 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,690 | $822.5 | 74,518 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 880 | $823.72 | 73,638 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 1,400 | $824.6 | 72,238 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 320 | $851.45 | 32,540 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 640 | $852.87 | 31,900 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 680 | $854.41 | 31,220 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 240 | $855.72 | 30,980 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 240 | $857.41 | 30,740 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 280 | $860.47 | 30,460 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 280 | $861.07 | 30,180 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 320 | $864.41 | 29,860 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 240 | $868.43 | 29,620 | Form 4 |
| 2026-09-11 | Romano Gianluca | M (A) | 1,695 | $0 | 31,315 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 200 | $844.81 | 34,020 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 200 | $846.94 | 33,820 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 320 | $847.98 | 33,500 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 560 | $849.53 | 32,940 | Form 4 |
| 2026-09-11 | Romano Gianluca | S (D) | 80 | $849.87 | 32,860 | Form 4 |
| 2026-09-11 | Morris John Christopher | M (A) | 942 | $0 | 16,961 | Form 4 |
| 2026-09-11 | Chong Kian Fatt | M (A) | 678 | $0 | 10,623 | Form 4 |
| 2026-09-11 | Teh Ban Seng | M (A) | 989 | $0 | 6,799 | Form 4 |
| 2026-09-10 | Mosley William D | S (D) | 1,534 | $862.13 | 296,449 | Form 4 |
| 2026-09-10 | Mosley William D | S (D) | 1,316 | $862.14 | 297,548 | Form 4 |
| 2026-09-10 | Romano Gianluca | S (D) | 523 | $862.13 | 28,931 | Form 4 |
| 2026-09-10 | Romano Gianluca | S (D) | 826 | $862.13 | 29,620 | Form 4 |
| 2026-09-10 | Morris John Christopher | S (D) | 319 | $862.14 | 16,019 | Form 4 |
| 2026-09-10 | Morris John Christopher | S (D) | 253 | $862.13 | 15,707 | Form 4 |
| 2026-09-10 | Teh Ban Seng | S (D) | 663 | $860.09 | 5,810 | Form 4 |
| 2026-09-09 | Mosley William D | M (A) | 2,815 | $0 | 297,983 | Form 4 |
| 2026-09-09 | Mosley William D | M (A) | 2,415 | $0 | 298,864 | Form 4 |
| 2026-09-09 | Romano Gianluca | M (A) | 959 | $0 | 29,453 | Form 4 |
| 2026-09-09 | Romano Gianluca | M (A) | 1,515 | $0 | 30,446 | Form 4 |
| 2026-09-09 | Morris John Christopher | M (A) | 500 | $0 | 15,960 | Form 4 |
| 2026-09-09 | Morris John Christopher | M (A) | 631 | $0 | 16,338 | Form 4 |
| 2026-09-09 | Teh Ban Seng | M (A) | 663 | $0 | 6,473 | Form 4 |
| 2026-09-09 | Teh Ban Seng | M (A) | 600 | $0 | 5,810 | Form 4 |
| 2026-09-09 | Chong Kian Fatt | M (A) | 379 | $0 | 9,945 | Form 4 |
| 2026-09-09 | Chong Kian Fatt | M (A) | 202 | $0 | 9,566 | Form 4 |
| 2026-09-01 | Conyers Yolanda Lee | S (D) | 750 | $815.11 | 3,351 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 80 | $830.36 | 295,248 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 80 | $829.1 | 295,328 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 120 | $827.9 | 295,408 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 340 | $826.86 | 295,528 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 580 | $826 | 295,868 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 600 | $824.93 | 296,448 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 1,240 | $824.05 | 297,048 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 600 | $822.89 | 298,288 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 480 | $822.05 | 298,888 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 920 | $820.89 | 299,368 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 1,320 | $819.84 | 300,288 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 1,040 | $818.78 | 301,608 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 2,080 | $817.71 | 302,648 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 4,287 | $816.75 | 304,728 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 4,555 | $815.75 | 309,015 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 2,878 | $814.75 | 313,570 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 80 | $832.05 | 295,168 | Form 4 |
| 2026-09-01 | Mosley William D | M (A) | 14,000 | $46.23 | 325,168 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 357 | $804.61 | 324,811 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 160 | $805.55 | 324,651 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 160 | $807.19 | 324,491 | Form 4 |
| 2026-09-01 | Mosley William D | S (D) | 960 | $808.62 | 323,531 | Form 4 |
Transaction codes in this quarter
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Questions
Are insiders buying or selling Seagate Technology Holdings plc (STX)?
In Q3 2026, insiders at Seagate Technology Holdings plc reported 432 non-derivative transactions on 38 Forms 3, 4 and 5: 0 open-market purchases and 379 sales worth $379.1M. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.
Where do these Seagate Technology Holdings plc insider trades come from?
From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.
Source: SEC Insider Transactions Data Sets, Q3 2026, retrieved 2026-10-27. Footnotes, derivative holdings and amendments are in the linked filings. Not investment advice.
Plain-text version for agents and LLMs: /insider-trading/stx.md
Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.