LYTIR

Company · STX

Seagate Technology Holdings PLC

Name as listed on its exchange; filed with the SEC as Seagate Technology Holdings plc.

Nasdaq's symbol directory lists STX on Nasdaq as “Seagate Technology Holdings PLC - Ordinary Shares (Ireland)”.

In the 12 months to Nov 8, 2026: insiders sold on 43 occasions ($422.9M); 29 planned-sale notices; 3 filings by holders of 5% or more; 5 congressional trade disclosures; 5 company reports (Form 8-K, since May 26, 2026).

All insider filings at the SEC · Appeared in No. 14, No. 13, No. 12, No. 11, No. 10, No. 9, No. 8, No. 7

Insider purchases and sales, by month (last 12 months)Insider purchases: $0 in total; Insider sales: $422.9M in total.Jun: Insider sales $8.9MJul: Insider sales $15.4MAug: Insider sales $99.8MSep: Insider sales $250.7MOct: Insider sales $29.8MNov: Insider sales $18.2MDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $0Insider sales below: $422.9M
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. William D. Mosley, CEO sold on 11 days 5 of them under a 10b5-1 plan latest Nov 2, 2026 sold $208.0M
  2. Gianluca Romano, EVP & CFO sold on 8 days 3 of them under a 10b5-1 plan latest Sep 15, 2026 sold $110.0M
  3. Ban Seng Teh, EVP & Chief Commercial Officer sold on 8 days 7 of them under a 10b5-1 plan latest Sep 15, 2026 sold $64.3M
  4. John C. Morris, EVP & CTO sold on 10 days 6 of them under a 10b5-1 plan latest Oct 30, 2026 sold $28.0M
  5. James C. Lee, EVP & CLO sold on 5 days 2 of them under a 10b5-1 plan latest Oct 23, 2026 sold $12.0M
  6. Conyers Yolanda Lee sold on 1 day all under a 10b5-1 plan latest Sep 1, 2026 sold $611K
Every trade (43)
  1. SELLWilliam D. Mosley, CEO sold Nov 2, 2026 30,000 shares 41 legs combined 10b5-1 plan (scheduled) filing $18.2M
  2. SELLJohn C. Morris, EVP & CTO sold Oct 30, 2026 2,675 shares 24 legs combined 10b5-1 plan (scheduled) filing $1.7M
  3. SELLJames C. Lee, EVP & CLO sold Oct 23, 2026 547 shares filing $351K
  4. SELLWilliam D. Mosley, CEO sold Oct 1, 2026 30,000 shares 44 legs combined 10b5-1 plan (scheduled) filing $27.7M
  5. SELLJohn C. Morris, EVP & CTO sold Sep 21, 2026 9,354 shares 26 legs combined 10b5-1 plan (scheduled) filing $8.2M
  6. SELLWilliam D. Mosley, CEO sold Sep 15, 2026 97,889 shares filing $75.6M
  7. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Sep 15, 2026 52,730 shares 24 legs combined 10b5-1 plan (scheduled) filing $41.2M
  8. SELLGianluca Romano, EVP & CFO sold Sep 15, 2026 49,983 shares filing $38.6M
  9. SELLJohn C. Morris, EVP & CTO sold Sep 15, 2026 15,465 shares filing $11.9M
  10. SELLWilliam D. Mosley, CEO sold Sep 14, 2026 1,869 shares filing $1.5M
  11. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Sep 14, 2026 989 shares 10b5-1 plan (scheduled) filing $770K
  12. SELLGianluca Romano, EVP & CFO sold Sep 14, 2026 955 shares 10b5-1 plan (scheduled) filing $746K
  13. SELLJohn C. Morris, EVP & CTO sold Sep 14, 2026 492 shares filing $384K
  14. SELLGianluca Romano, EVP & CFO sold Sep 11, 2026 50,498 shares 38 legs combined 10b5-1 plan (scheduled) filing $42.0M
  15. SELLWilliam D. Mosley, CEO sold Sep 10, 2026 2,848 shares 2 legs combined filing $2.5M
  16. SELLGianluca Romano, EVP & CFO sold Sep 10, 2026 1,347 shares 2 legs combined filing $1.2M
  17. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Sep 10, 2026 663 shares 10b5-1 plan (scheduled) filing $570K
  18. SELLJohn C. Morris, EVP & CTO sold Sep 10, 2026 572 shares 2 legs combined filing $493K
  19. SELLWilliam D. Mosley, CEO sold Sep 1, 2026 30,000 shares 26 legs combined 10b5-1 plan (scheduled) filing $24.5M
  20. SELLConyers Yolanda Lee sold Sep 1, 2026 750 shares 10b5-1 plan (scheduled) filing $611K
  21. SELLJames C. Lee, EVP & CLO sold Aug 24, 2026 9,013 shares 29 legs combined 10b5-1 plan (scheduled) filing $7.2M
  22. SELLWilliam D. Mosley, CEO sold Aug 21, 2026 18,137 shares 3 legs combined filing $15.4M
  23. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Aug 21, 2026 9,862 shares 27 legs combined 10b5-1 plan (scheduled) filing $8.4M
  24. SELLGianluca Romano, EVP & CFO sold Aug 21, 2026 9,075 shares 3 legs combined filing $7.7M
  25. SELLJames C. Lee, EVP & CLO sold Aug 21, 2026 3,938 shares 3 legs combined filing $3.3M
  26. SELLJohn C. Morris, EVP & CTO sold Aug 21, 2026 3,515 shares 3 legs combined 10b5-1 plan (scheduled) filing $3.0M
  27. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Aug 20, 2026 6,048 shares 19 legs combined 10b5-1 plan (scheduled) filing $5.1M
  28. SELLJohn C. Morris, EVP & CTO sold Aug 20, 2026 523 shares 10b5-1 plan (scheduled) filing $437K
  29. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Aug 13, 2026 7,361 shares 2 legs combined filing $6.8M
  30. SELLGianluca Romano, EVP & CFO sold Aug 7, 2026 22,211 shares 65 legs combined 10b5-1 plan (scheduled) filing $17.8M
  31. SELLWilliam D. Mosley, CEO sold Aug 3, 2026 30,000 shares 48 legs combined 10b5-1 plan (scheduled) filing $24.5M
  32. SELLJohn C. Morris, EVP & CTO sold Aug 3, 2026 168 shares 10b5-1 plan (scheduled) filing $137K
  33. SELLJames C. Lee, EVP & CLO sold Jul 30, 2026 694 shares 10b5-1 plan (scheduled) filing $609K
  34. SELLJames C. Lee, EVP & CLO sold Jul 23, 2026 542 shares filing $491K
  35. SELLWilliam D. Mosley, CEO sold Jul 1, 2026 15,671 shares 15 legs combined 10b5-1 plan (scheduled) filing $14.3M
  36. SELLWilliam D. Mosley, CEO sold Jun 12, 2026 1,768 shares filing $1.6M
  37. SELLJohn C. Morris, EVP & CTO sold Jun 12, 2026 1,364 shares 2 legs combined 10b5-1 plan (scheduled) filing $1.2M
  38. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Jun 12, 2026 989 shares 10b5-1 plan (scheduled) filing $871K
  39. SELLGianluca Romano, EVP & CFO sold Jun 12, 2026 903 shares filing $795K
  40. SELLWilliam D. Mosley, CEO sold Jun 10, 2026 2,854 shares 2 legs combined filing $2.3M
  41. SELLGianluca Romano, EVP & CFO sold Jun 10, 2026 1,350 shares 2 legs combined filing $1.1M
  42. SELLBan Seng Teh, EVP & Chief Commercial Officer sold Jun 10, 2026 663 shares 10b5-1 plan (scheduled) filing $545K
  43. SELLJohn C. Morris, EVP & CTO sold Jun 10, 2026 573 shares 2 legs combined filing $471K

Planned sales · SEC Form 144

Notice given

A Form 144 is filed before an insider sells restricted stock. It states an intent; the sale, if it happens, appears later on a Form 4. Every recent notice

  1. Lee James CI filed Oct 23, 2026 Officer 600 shares planned sale date 10/23/2026 filing $380K
  2. JOHN C MORRIS filed Sep 21, 2026 Officer 14,849 shares planned sale date 09/21/2026 filing $12.8M
  3. MOSLEY WILLIAM D filed Sep 15, 2026 Officer 102,784 shares planned sale date 09/15/2026 filing $79.4M
  4. BAN SENG TEH filed Sep 15, 2026 Officer 52,730 shares planned sale date 09/15/2026 filing $41.2M
  5. Romano Gianluca filed Sep 15, 2026 Officer 52,483 shares planned sale date 09/15/2026 filing $40.5M
  6. Morris John Christopher filed Sep 15, 2026 Officer 16,239 shares planned sale date 09/15/2026 filing $12.5M
  7. MOSLEY WILLIAM D filed Sep 14, 2026 Officer 1,963 shares planned sale date 09/14/2026 filing $1.5M
  8. Romano Gianluca filed Sep 14, 2026 Officer 1,003 shares planned sale date 09/14/2026 filing $783K
  9. BAN SENG TEH filed Sep 14, 2026 Officer 989 shares planned sale date 09/14/2026 filing $770K
  10. Morris John Christopher filed Sep 14, 2026 Officer 518 shares planned sale date 09/14/2026 filing $404K
  11. GIANLUCA ROMANO filed Sep 11, 2026 Officer 50,498 shares planned sale date 09/11/2026 filing $43.5M
  12. MOSLEY WILLIAM D filed Sep 10, 2026 Officer 2,992 shares planned sale date 09/10/2026 filing $2.6M
  13. Romano Gianluca filed Sep 10, 2026 Officer 1,415 shares planned sale date 09/10/2026 filing $1.2M
  14. BAN SENG TEH filed Sep 10, 2026 Officer 663 shares planned sale date 09/10/2026 filing $570K
  15. Morris John Christopher filed Sep 10, 2026 Officer 601 shares planned sale date 09/10/2026 filing $518K
  16. WILLIAM D. MOSLEY filed Sep 1, 2026 Director 90,000 shares planned sale date 09/01/2026 filing $74.6M
  17. YOLANDA CONYERS filed Sep 1, 2026 Director 750 shares planned sale date 09/01/2026 filing $621K
  18. JAMES LEE filed Aug 24, 2026 Officer 9,013 shares planned sale date 08/24/2026 filing $7.7M
  19. MOSLEY WILLIAM D filed Aug 21, 2026 Officer 18,200 shares planned sale date 08/21/2026 filing $15.5M
  20. BAN SENG TEH filed Aug 21, 2026 Officer 9,862 shares planned sale date 08/21/2026 filing $8.4M
  21. Romano Gianluca filed Aug 21, 2026 Officer 9,135 shares planned sale date 08/21/2026 filing $7.8M
  22. Lee James CI filed Aug 21, 2026 Officer 4,000 shares planned sale date 08/21/2026 filing $3.4M
  23. Morris John Christopher filed Aug 21, 2026 Officer 3,575 shares planned sale date 08/21/2026 filing $3.0M
  24. BAN SENG TEH filed Aug 20, 2026 Officer 6,048 shares planned sale date 08/20/2026 filing $5.1M
  25. JOHN MORRIS filed Aug 20, 2026 Officer 523 shares planned sale date 08/20/2026 filing $435K
  26. BAN SENG TEH filed Aug 13, 2026 Officer 7,361 shares planned sale date 08/13/2026 filing $6.8M
  27. GIANLUCA ROMANO filed Aug 7, 2026 Officer 22,211 shares planned sale date 08/07/2026 filing $18.9M
  28. JAMES LEE filed Jul 30, 2026 Officer 694 shares planned sale date 07/30/2026 filing $531K
  29. Lee James CI filed Jul 23, 2026 Officer 543 shares planned sale date 07/23/2026 filing $491K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. FMR LLC filed Nov 5, 2026 Schedule 13G passive 11,459,204 shares filing 5.1%
  2. Sanders Capital, LLC filed Aug 5, 2026 Schedule 13G/A passive 3,496,343 shares filing 1.56%
  3. VANGUARD PORTFOLIO MANAGEMENT LLC filed Jul 31, 2026 Schedule 13G/A passive 7,999,686 shares filing 3.56%

Congress · STOCK Act

The Althing

Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.

  1. Kevin Hern (R-OK01): Sale Oct 23, 2026 reported Oct 28, 2026 one of 3 trades the member reported that day House Stocks (including ADRs) $15,001 - $50,000
  2. Lisa McClain (R-MI09): Sale Sep 30, 2026 reported Oct 12, 2026 one of 9 trades the member reported that day House Stocks (including ADRs) owner: spouse $15,001 - $50,000
  3. Kevin Hern (R-OK01): Sale Sep 15, 2026 reported Sep 25, 2026 one of 99 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  4. Alan Armstrong (R-OK): Purchase Mar 27, 2026 reported Jul 21, 2026 one of 703 trades the member reported that day Senate Stock $1,001 - $15,000
  5. Julie Johnson (D-TX32): Sale Dec 18, 2025 reported Jan 15, 2026 one of 62 trades the member reported that day House Stocks (including ADRs) owner: joint $1,001 - $15,000

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Submission of matters to a vote of security holders filing Oct 28, 2026
  2. Results of operations and financial condition; Regulation FD disclosure filing Oct 27, 2026
  3. Unregistered sales of equity securities; Regulation FD disclosure; Other events filing Sep 9, 2026
  4. Departure or appointment of directors or officers filing Sep 4, 2026
  5. Results of operations and financial condition; Regulation FD disclosure filing Jul 28, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.