SEC Form 4
Seagate Technology Holdings PLC (STX) insider trading
In the 12 months to Oct 24, 2026, 11 STX insiders reported open-market sales of $465.2M across 77 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $465.2M
- 77 filings · 11 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 54 of 77
- $391.7M of $465.2M sold (84%)
Who traded STX, and when
- Sale
- Sale, pre-arranged (10b5-1)
STX daily close from Oct 24, 2025 to Oct 23, 2026, between $223.00 and $1,094.04, last $630.49. 77 sale and 0 purchase filings by 11 insiders, marked at their filing dates. William D. Mosley, CEO: sold $226.8M across 21 filings, first filed Nov 5, 2025, last Oct 2, 2026. Gianluca Romano, EVP & CFO: sold $107.1M across 13 filings, first filed Nov 14, 2025, last Sep 15, 2026. Ban Seng Teh, EVP & Chief Commercial Officer: sold $88.9M across 14 filings, first filed Nov 5, 2025, last Sep 16, 2026. John Christopher Morris, EVP & CTO: sold $18.3M across 10 filings, first filed Dec 16, 2025, last Sep 22, 2026. James CI Lee, EVP & CLO: sold $12.1M across 6 filings, first filed Nov 12, 2025, last Aug 26, 2026. Kian Fatt Chong, EVP Global Operations: sold $4.4M across 2 filings, first filed Nov 3, 2025, last Feb 23, 2026. 5 others: sold $7.6M across 11 filings, first filed Nov 3, 2025, last Sep 3, 2026.
Largest mark · tap a row for others
Gianluca Romano · EVP & CFO
Filing 1 of 3 within a week · $43,189,011 total
Sale $1,162,156
1,348 shares
Filed Sep 11, 2026 · traded Sep 10
Close on filing date $830.17
William D. Mosley · CEO
CEO
$226.8M soldGianluca Romano · EVP & CFO
EVP & CFO
$107.1M soldBan Seng Teh · EVP & Chief Commercial Officer
EVP & Chief Commercial Officer
$88.9M soldJohn Christopher Morris · EVP & CTO
EVP & CTO
$18.3M soldJames CI Lee · EVP & CLO
EVP & CLO
$12.1M soldKian Fatt Chong · EVP Global Operations
EVP Global Operations
$4.4M sold5 others
Combined, one mark per week
$7.6M soldHas Seagate Technology Holdings PLC's CEO sold stock?
Yes. William D. Mosley (CEO) sold 350,195 shares ($226.8M) between Nov 2025 and Oct 2026, $195.1M of it under a pre-arranged 10b5-1 plan.
Open-market trades
77 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| William D. Mosley | CEO | $226.8M | — | 21 | 86% of sales | |
| Gianluca Romano | EVP & CFO | $107.1M | — | 13 | 90% of sales | |
| Ban Seng Teh | EVP & Chief Commercial Officer | $88.9M | — | 14 | 81% of sales | |
| John Christopher Morris | EVP & CTO | $18.3M | — | 10 | 95% of sales | |
| James CI Lee | EVP & CLO | $12.1M | — | 6 | 72% of sales | |
| Kian Fatt Chong | EVP Global Operations | $4.4M | — | 2 | — | |
| Shankar Arumugavelu | Director | $2.4M | — | 2 | — | |
| Yolanda Lee Conyers | Director | $1.8M | — | 4 | 100% of sales | |
| Stephanie Tilenius | Director | $1.8M | — | 2 | — | |
| Prat Bhatt | Director | $929.9K | — | 1 | 100% of sales | |
| Jay L. Geldmacher | Director | $750.8K | — | 2 | — |
| Filed | Insider | Type | Shares | Value | Held after | Source |
|---|---|---|---|---|---|---|
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 18,998 ordinary shares | $17.4M | 390,407 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 11,002 ordinary shares | $10.3M | 371,895 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 9,354 ordinary shares | $8.2M | 31,887 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 52,730 ordinary shares | $41.2M | 57,626 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 45,898 ordinary shares | $38.1M | 40,500 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 4,600 ordinary shares | $3.9M | 30,980 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 989 ordinary shares | $770.4K | 5,810 | |
traded | William D. Mosley CEO | Sale | 2,849 ordinary shares | $2.5M | 296,449 | |
traded | Gianluca Romano EVP & CFO | Sale | 1,348 ordinary shares | $1.2M | 29,620 | |
traded | John Christopher Morris EVP & CTO | Sale | 572 ordinary shares | $493.4K | 16,019 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 663 ordinary shares | $570.2K | 5,810 | |
traded | Yolanda Lee Conyers Director | SalePre-arranged (10b5-1) | 750 ordinary shares | $611.3K | 3,351 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 30,000 ordinary shares | $24.5M | 316,448 | |
traded | James CI Lee EVP & CLO | SalePre-arranged (10b5-1) | 9,013 ordinary shares | $7.2M | 5,960 | |
traded | William D. Mosley CEO | Sale | 18,139 ordinary shares | $15.4M | 308,240 | |
traded | Gianluca Romano EVP & CFO | Sale | 9,076 ordinary shares | $7.7M | 28,494 | |
traded | James CI Lee EVP & CLO | Sale | 3,939 ordinary shares | $3.3M | 1,191 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 4,039 ordinary shares | $3.4M | 14,847 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 6,048 ordinary shares | $5.1M | 20,880 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 9,862 ordinary shares | $8.4M | 11,240 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | Sale | 7,361 ordinary shares | $6.8M | 4,290 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 7,240 ordinary shares | $5.7M | 37,914 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 14,091 ordinary shares | $11.4M | 27,635 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 880 ordinary shares | $743.7K | 21,463 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 12,920 ordinary shares | $10.4M | 317,997 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 17,080 ordinary shares | $14.1M | 300,837 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 168 ordinary shares | $137.4K | 11,920 | |
traded | James CI Lee EVP & CLO | SalePre-arranged (10b5-1) | 694 ordinary shares | $609.0K | 347 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,657 ordinary shares | $18.8M | 322,925 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 9,343 ordinary shares | $8.6M | 311,517 | |
traded | William D. Mosley CEO | Sale | 1,768 ordinary shares | $1.6M | 327,517 | |
traded | Gianluca Romano EVP & CFO | Sale | 903 ordinary shares | $795.0K | 42,860 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 989 ordinary shares | $870.5K | 4,290 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 1,364 ordinary shares | $1.2M | 12,088 | |
traded | Gianluca Romano EVP & CFO | Sale | 1,351 ordinary shares | $1.1M | 41,381 | |
traded | William D. Mosley CEO | Sale | 2,855 ordinary shares | $2.3M | 324,870 | |
traded | John Christopher Morris EVP & CTO | Sale | 574 ordinary shares | $471.4K | 12,510 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 663 ordinary shares | $544.9K | 4,290 | |
traded | Shankar Arumugavelu Director | Sale | 1,000 ordinary shares | $927.7K | 6,626 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 16,220 ordinary shares | $14.6M | 347,819 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 13,780 ordinary shares | $12.7M | 329,745 | |
traded | Yolanda Lee Conyers Director | SalePre-arranged (10b5-1) | 750 ordinary shares | $664.0K | 4,101 | |
traded | Prat Bhatt Director | SalePre-arranged (10b5-1) | 1,000 ordinary shares | $929.9K | 12,869 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 30,000 ordinary shares | $22.5M | 343,332 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 15,560 ordinary shares | $12.7M | 3,691 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 22,488 ordinary shares | $17.4M | 56,194 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 1,902 ordinary shares | $1.5M | 40,945 | |
traded | James CI Lee EVP & CLO | SalePre-arranged (10b5-1) | 697 ordinary shares | $516.6K | 324 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 5,626 ordinary shares | $4.2M | 12,442 | |
traded | Stephanie Tilenius Director | Sale | 1,580 ordinary shares | $1.2M | 10,704 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,000 ordinary shares | $8.4M | 375,191 | |
traded | William D. Mosley CEO | Sale | 24,584 ordinary shares | $10.0M | 375,591 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 112 ordinary shares | $42.3K | 17,580 | |
traded | Yolanda Lee Conyers Director | SalePre-arranged (10b5-1) | 750 ordinary shares | $295.2K | 4,851 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,000 ordinary shares | $7.7M | 398,397 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 240 ordinary shares | $98.4K | 16,566 | |
traded | Kian Fatt Chong EVP Global Operations | Sale | 5,846 ordinary shares | $2.4M | 0 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,000 ordinary shares | $8.6M | 427,103 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | Sale | 20,195 ordinary shares | $8.9M | 12,525 | |
traded | Jay L. Geldmacher Director | Sale | 925 ordinary shares | $414.4K | 223 | |
traded | James CI Lee EVP & CLO | SalePre-arranged (10b5-1) | 673 ordinary shares | $234.8K | 257 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 1,412 ordinary shares | $422.6K | 13,693 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,000 ordinary shares | $5.7M | 432,395 | |
traded | John Christopher Morris EVP & CTO | SalePre-arranged (10b5-1) | 113 ordinary shares | $33.0K | 14,250 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 2,010 ordinary shares | $594.8K | 13,693 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,000 ordinary shares | $5.4M | 446,568 | |
traded | Yolanda Lee Conyers Director | SalePre-arranged (10b5-1) | 750 ordinary shares | $204.7K | 5,601 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 54,021 ordinary shares | $15.4M | 76,022 | |
traded | Gianluca Romano EVP & CFO | SalePre-arranged (10b5-1) | 8,002 ordinary shares | $2.1M | 55,993 | |
traded | Shankar Arumugavelu Director | Sale | 5,000 ordinary shares | $1.5M | 7,626 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | SalePre-arranged (10b5-1) | 1,412 ordinary shares | $408.0K | 12,041 | |
traded | James CI Lee EVP & CLO | SalePre-arranged (10b5-1) | 697 ordinary shares | $201.4K | 257 | |
traded | William D. Mosley CEO | SalePre-arranged (10b5-1) | 20,000 ordinary shares | $5.3M | 477,969 | |
traded | Stephanie Tilenius Director | Sale | 2,046 ordinary shares | $545.1K | 12,244 | |
traded | Ban Seng Teh EVP & Chief Commercial Officer | Sale | 6,000 ordinary shares | $1.6M | 12,041 | |
traded | Jay L. Geldmacher Director | Sale | 1,250 ordinary shares | $336.4K | 1,148 | |
traded | Kian Fatt Chong EVP Global Operations | Sale | 7,078 ordinary shares | $1.9M | 0 |
Shares are as filed (ordinary shares or ADS); values are as converted to US$ in the filing.
GET /stocks/filings/vX/form-4?tickers=STX&filing_date.gte=2025-10-24&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"STX"
],
"issuer_cik": "0001137789",
"owner_cik": "0001388390",
"accession_number": "0001137789-26-000262",
"form_type": "4",
"filing_date": "2026-10-02",
"period_of_report": "2026-10-01",
"issuer_name": "Seagate Technology Holdings plc",
"issuer_trading_symbol": "STX",
"owner_name": "MOSLEY WILLIAM D",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "CEO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary Shares",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 840,
"transaction_price_per_share": 933.2762,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 368070.25,
"transaction_value": 783952.008,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F6",
"description": "These Ordinary Shares were sold in multiple trades at prices ranging from $932.73 to $933.67. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected."
}
]
},
{
"tickers": [
"STX"
],
"issuer_cik": "0001137789",
"owner_cik": "0001388390",
"accession_number": "0001137789-26-000261",
"form_type": "4",
"filing_date": "2026-10-02",
"period_of_report": "2026-10-01",
"issuer_name": "Seagate Technology Holdings plc",
"issuer_trading_symbol": "STX",
"owner_name": "MOSLEY WILLIAM D",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "CEO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary Shares",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 696,
"transaction_price_per_share": 913.0784,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 383574.25,
"transaction_value": 635502.5664,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F15",
"description": "These Ordinary Shares were sold in multiple trades at prices ranging from $912.54 to $913.53. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 158 records
- Option exercises125 records
- Tax withholding26 records
- Tax withholding (sold to cover)7 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for STX every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.