Seagate Technology Holdings plc (STX) has 20 known insider and institutional holders on record. The largest holder is ValueAct Holdings, L.P. with 13,737,070 shares. Other notable holders include MOSLEY WILLIAM D and LUCZO STEPHEN J.
Over the last 12 months, insiders have made 48 transactions in STX stock — 5 buys (valued at $2.74M) and 17 sells (valued at $20.78M). Insider selling has exceeded buying during this period.
STX Insider Ownership
Top Holder
ValueAct Holdings, L.P.
13,737,070 shares
Buys (12 mo)
5
$2.74M value
Sells (12 mo)
17
$20.78M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Valueact Holdings, L.p. |
Director |
13,737,070 |
2022-02-22 |
|
| 2 |
Mosley William D |
CEO |
355,591 |
2026-04-02 |
|
| 3 |
Luczo Stephen J |
Director |
225,941 |
2022-03-08 |
|
| 4 |
Naik Ravi |
EVP, Lyve Storage Services |
38,857 |
2023-03-23 |
|
| 5 |
Morris John Christopher |
EVP & CTO |
17,580 |
2026-03-16 |
|
| 6 |
Bruner Judy |
Director |
12,268 |
2025-05-23 |
|
| 7 |
Tilenius Stephanie |
Director |
12,244 |
2025-06-06 |
|
| 8 |
Clemmer Richard L |
Director |
11,483 |
2022-08-25 |
|
| 9 |
Cannon Michael R |
Director |
10,835 |
2025-06-06 |
|
| 10 |
Romano Gianluca |
EVP & CFO |
10,170 |
2026-03-12 |
|
| 11 |
Nygaard Jeffrey D. |
EVP, Operations and Technology |
6,156 |
2022-07-26 |
|
| 12 |
Teh Ban Seng |
EVP & Chief Commercial Officer |
5,934 |
2026-03-12 |
|
| 13 |
Schuelke Katherine |
SVP, CLO & Corporate Secretary |
5,490 |
2023-12-12 |
|
| 14 |
Conyers Yolanda Lee |
Director |
4,851 |
2026-03-03 |
|
| 15 |
Arumugavelu Shankar |
Director |
3,803 |
2022-10-24 |
|
| 16 |
Haggart Dylan G. |
Director |
3,803 |
2022-10-24 |
|
| 17 |
Bhatt Prat |
Director |
3,803 |
2022-10-24 |
|
| 18 |
Zander Edward J |
Director |
3,803 |
2022-10-24 |
|
| 19 |
Bruggeworth Robert A |
Director |
3,626 |
2022-11-14 |
|
| 20 |
Geldmacher Jay L |
Director |
2,852 |
2024-10-24 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Mosley William D |
CEO |
Informative Sell |
300 |
$427.97 |
$128.39K |
| 2026-03-19 |
Mosley William D |
CEO |
Informative Sell |
24,584 |
$406.77 |
$10M |
| 2026-03-13 |
Morris John Christopher |
EVP & CTO |
Informative Sell |
112 |
$377.44 |
$42.27K |
| 2026-03-11 |
Morris John Christopher |
EVP & CTO |
Option Exercise (Sell) |
942 |
- |
- |
| 2026-03-11 |
Chong Kian Fatt |
EVP Global Operations |
Option Exercise |
678 |
- |
- |
| 2026-03-11 |
Teh Ban Seng |
EVP & Chief Commercial Officer |
Option Exercise (Sell) |
989 |
- |
- |
| 2026-03-11 |
Romano Gianluca |
EVP & CFO |
Option Exercise (Sell) |
1,695 |
- |
- |
| 2026-03-11 |
Mosley William D |
CEO |
Option Exercise (Sell) |
3,319 |
- |
- |
| 2026-03-09 |
Morris John Christopher |
EVP & CTO |
Option Exercise (Sell) |
499 |
- |
- |
| 2026-03-09 |
Chong Kian Fatt |
EVP Global Operations |
Option Exercise |
202 |
- |
- |
| 2026-03-09 |
Teh Ban Seng |
EVP & Chief Commercial Officer |
Option Exercise (Sell) |
599 |
- |
- |
| 2026-03-09 |
Romano Gianluca |
EVP & CFO |
Option Exercise (Sell) |
958 |
- |
- |
| 2026-03-09 |
Mosley William D |
CEO |
Option Exercise (Sell) |
2,815 |
- |
- |
| 2026-03-02 |
Conyers Yolanda Lee |
Director |
Informative Sell |
750 |
$393.59 |
$295.19K |
| 2026-03-02 |
Mosley William D |
CEO |
Informative Sell |
100 |
$407.66 |
$40.77K |
| 2026-02-24 |
Morris John Christopher |
EVP & CTO |
Informative Sell |
240 |
$410.00 |
$98.4K |
| 2026-02-23 |
Chong Kian Fatt |
EVP Global Operations |
Informative Sell |
5,846 |
$416.48 |
$2.43M |
| 2026-02-20 |
Chong Kian Fatt |
EVP Global Operations |
Option Exercise (Sell) |
4,427 |
- |
- |
| 2026-02-20 |
Teh Ban Seng |
EVP & Chief Commercial Officer |
Option Exercise (Sell) |
5,905 |
- |
- |
| 2026-02-22 |
Romano Gianluca |
EVP & CFO |
Option Exercise (Sell) |
14,043 |
- |
- |
| 2026-02-20 |
Romano Gianluca |
EVP & CFO |
Option Exercise (Sell) |
11,807 |
- |
- |
| 2026-02-20 |
Mosley William D |
CEO |
Option Exercise (Sell) |
11,807 |
- |
- |
| 2025-06-16 |
Teh Ban Seng |
EVP & Chief Commercial Officer |
Informative Sell |
599 |
$130.00 |
$77.87K |
| 2025-06-11 |
Morris John Christopher |
SVP & CTO |
Option Exercise (Sell) |
941 |
- |
- |
| 2025-06-11 |
Chong Kian Fatt |
SVP, Global Operations |
Option Exercise |
678 |
- |
- |
