Notice of Proposed Sale · 144
Seagate Technology Holdings PLC
STXNASDAQEQUITYCurrent
Notice of Proposed Sale
Structured filing — 144
primary_doc.xml
Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.
Proposed-sale notice
- Issuer
- Seagate Technology Holdings plc
- Issuer CIK
- 0001137789
- SEC file number
- 001-31560
- Phone
- 65 6412 5172
- Person for whose account securities are to be sold
- MOSLEY WILLIAM D
- Relationships to issuer
- Officer · Director
- Street
- 121 WOODLANDS AVENUE 5
- City
- SINGAPORE
- State / country code
- U0
- Postal code
- 739009
Securities proposed for sale
| Security | Proposed units | Aggregate market value | Units outstanding | Approximate sale date | Exchange | Broker / market maker |
|---|---|---|---|---|---|---|
| Common Stock | 18,200 | 15,458,257.36 | 226,644,518 | 08/21/2026 | NASDAQGS | Morgan Stanley |
Broker / market maker — proposed row 1, entry 1
- Name
- Morgan Stanley
- Street
- 1 New York Plaza 8th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10004
Acquisition of securities to be sold
| Security | Acquired | Nature of acquisition | Acquired from | Amount acquired | Gift transaction | Payment date | Nature of payment |
|---|---|---|---|---|---|---|---|
| Common stock | 08/20/2026 | Restricted Stock Unit Vesting | Issuer | 6,404 | N | 08/20/2026 | Compensation for services |
| Common Stock | 08/20/2026 | Restricted Stock Unit Vesting | Issuer | 6,320 | N | 08/20/2026 | Compensation for services |
| Common Stock | 08/20/2026 | Restricted Stock Unit Vesting | Issuer | 21,065 | N | 08/20/2026 | Compensation for services |
Sales reported in the preceding three months
| Seller | Security | Sale date | Amount sold | Gross proceeds |
|---|---|---|---|---|
| William D. Mosley | Common Stock | 08/03/2026 | 30,000 | 24,511,131.27 |
| William D. Mosley | Common Stock | 07/01/2026 | 30,000 | 27,444,658.12 |
| William D. Mosley | Common Stock | 06/12/2026 | 1,768 | 1,556,394.00 |
| William D. Mosley | Common Stock | 06/09/2026 | 2,855 | 2,345,874.00 |
| William D. Mosley | Common Stock | 06/01/2026 | 30,000 | 27,347,824.00 |
Seller — prior-sale row 1, entry 1
- Name
- William D. Mosley
- Street
- 47488 Kato Rd
- City
- Fremont
- State / country code
- CA
- Postal code
- 94538
Seller — prior-sale row 2, entry 1
- Name
- William D. Mosley
- Street
- 47488 Kato Road
- City
- Fremont
- State / country code
- CA
- Postal code
- 94538
Seller — prior-sale row 3, entry 1
- Name
- William D. Mosley
- Street
- 474888 Kato Road
- City
- Fremont
- State / country code
- CA
- Postal code
- 94538
Seller — prior-sale row 4, entry 1
- Name
- William D. Mosley
- Street
- 47488 Kato Road
- City
- Fremont
- State / country code
- CA
- Postal code
- 94538
Seller — prior-sale row 5, entry 1
- Name
- William D. Mosley
- Street
- 47488 Kato Road
- City
- Fremont
- State / country code
- CA
- Postal code
- 94538
Prior-sale reporting
- Nothing to report for the preceding three months
- N
Remarks
Sales to be made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations. PoA attached.
Notice signature
- Notice date
- 08/21/2026
- Signed
- /s/ Dawn Ledbetter. Attorney-in-Fact for William D. Mosley
- Plan adoption dates
- 08/20/2026
Company context
Seagate (NASDAQ: STX) is a pioneer in mass-capacity data storage, accelerating ability to harness the full value of data. Our portfolio of advanced storage solutions helps hyperscale cloud providers, enterprises, and consumers protect, create and manage the data that powers their transformation and growth. For more than 45 years, Seagate has driven breakthrough innovations that bring sustainable, high-performance storage to the world at-scale.