Insider Ledger

STX insider buying and SEC filings, explained

Seagate Technology Holdings plc · CIK 1137789

Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov

Insider activity in the last 12 months

Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$202.3M
Planned sales (10b5-1)
$412.4M

Insider purchases and sales, last 12 months

TradedTypeWhat was filedSource
Nov 2, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 6,720 shares at about $622.82 ($4.2M), marked as a 10b5-1 plan trade. Holdings down 2% to 346,108 shares.SEC filing
Filed Nov 3, 2026, 4:59 PM ET
Nov 2, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 23,280 shares at about $602.44 ($14.0M), marked as a 10b5-1 plan trade. Holdings down 6% to 352,828 shares.SEC filing
Filed Nov 3, 2026, 4:59 PM ET
Oct 30, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 2,675 shares at about $650.15 ($1.7M), marked as a 10b5-1 plan trade. Holdings down 11% to 20,933 shares.SEC filing
Filed Nov 3, 2026, 4:59 PM ET
Oct 23, 2026SaleJames CI Lee (EVP & CLO) sold 547 shares at $642.14 ($351K). Holdings down 35% to 1,037 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Oct 26, 2026, 4:13 PM ET
Oct 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 11,002 shares at about $935.60 ($10.3M), marked as a 10b5-1 plan trade. Holdings down 3% to 362,108 shares.SEC filing
Filed Oct 2, 2026, 4:07 PM ET
Oct 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 18,998 shares at about $914.67 ($17.4M), marked as a 10b5-1 plan trade. Holdings down 5% to 373,110 shares.SEC filing
Filed Oct 2, 2026, 4:07 PM ET
Sep 21, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 9,354 shares at about $877.91 ($8.2M), marked as a 10b5-1 plan trade. Holdings down 29% to 22,693 shares.SEC filing
Filed Sep 22, 2026
Sep 15, 2026SaleGianluca Romano (CFO) sold 49,984 shares at $772.16 ($38.6M). Holdings down 41% to 70,757 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 16, 2026
Sep 15, 2026SaleWilliam D. Mosley (CEO and Director) sold 97,889 shares at $772.14 ($75.6M). Holdings down 21% to 378,108 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 16, 2026
Sep 15, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 52,730 shares at about $782.08 ($41.2M), marked as a 10b5-1 plan trade. Holdings down 90% to 5,810 shares.SEC filing
Filed Sep 16, 2026
Sep 15, 2026SaleJohn Christopher Morris (EVP & CTO) sold 15,466 shares at $772.15 ($11.9M). Holdings down 33% to 31,132 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 16, 2026
Sep 14, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 989 shares at $779.00 ($770K), marked as a 10b5-1 plan trade. Holdings down 15% to 5,810 shares.SEC filing
Filed Sep 15, 2026
Sep 14, 2026SaleJohn Christopher Morris (EVP & CTO) sold 493 shares at $781.23 ($385K). Holdings down 3% to 16,468 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 15, 2026
Sep 11–14, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 5,555 shares between Sep 11 and Sep 14 at about $841.95 ($4.7M), marked as a 10b5-1 plan trade. Holdings down 15% to 30,360 shares.SEC filing
Filed Sep 15, 2026
Sep 11, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 45,898 shares at about $830.01 ($38.1M), marked as a 10b5-1 plan trade. Holdings down 57% to 34,220 shares.SEC filing
Filed Sep 15, 2026
Sep 14, 2026SaleWilliam D. Mosley (CEO and Director) sold 1,870 shares at $781.23 ($1.5M). Holdings down 1% to 298,998 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 15, 2026
Sep 10, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 663 shares at $860.09 ($570K), marked as a 10b5-1 plan trade. Holdings down 10% to 5,810 shares.SEC filing
Filed Sep 11, 2026
Sep 10, 2026SaleJohn Christopher Morris (EVP & CTO) sold 572 shares at about $862.14 ($493K). Holdings down 3% to 16,019 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 11, 2026
Sep 10, 2026SaleGianluca Romano (CFO) sold 1,348 shares at $862.13 ($1.2M). Holdings down 4% to 29,620 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 11, 2026
Sep 10, 2026SaleWilliam D. Mosley (CEO and Director) sold 2,849 shares at about $862.13 ($2.5M). Holdings down 1% to 297,548 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Sep 11, 2026
Sep 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 30,000 shares at about $816.28 ($24.5M), marked as a 10b5-1 plan trade. Holdings down 9% to 295,168 shares.SEC filing
Filed Sep 3, 2026
Sep 1, 2026Planned (10b5-1)Yolanda Lee Conyers (Director) sold 750 shares at $815.11 ($611K), marked as a 10b5-1 plan trade. Holdings down 18% to 3,351 shares.SEC filing
Filed Sep 3, 2026
Aug 24, 2026Planned (10b5-1)James CI Lee (EVP & CLO) sold 9,013 shares at about $794.84 ($7.2M), marked as a 10b5-1 plan trade. Holdings down 96% to 347 shares.SEC filing
Filed Aug 26, 2026
Aug 21, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 9,862 shares at about $852.97 ($8.4M), marked as a 10b5-1 plan trade. Holdings down 65% to 5,210 shares.SEC filing
Filed Aug 24, 2026
Aug 20, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 6,048 shares at about $842.97 ($5.1M), marked as a 10b5-1 plan trade. Holdings down 29% to 15,072 shares.SEC filing
Filed Aug 24, 2026
Aug 20–21, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 4,039 shares between Aug 20 and Aug 21 at about $847.56 ($3.4M), marked as a 10b5-1 plan trade. Holdings down 21% to 15,460 shares.SEC filing
Filed Aug 24, 2026
Aug 21, 2026SaleJames CI Lee (EVP & CLO) sold 3,939 shares at $849.35 ($3.3M). Holdings down 43% to 5,328 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Aug 24, 2026
Aug 21, 2026SaleGianluca Romano (CFO) sold 9,076 shares at $849.35 ($7.7M). Holdings down 24% to 28,494 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Aug 24, 2026
Aug 21, 2026SaleWilliam D. Mosley (CEO and Director) sold 18,139 shares at $849.35 ($15.4M). Holdings down 6% to 311,168 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Aug 24, 2026
Aug 13, 2026SaleBan Seng Teh (EVP & Chief Commercial Officer) sold 7,361 shares at about $920.80 ($6.8M). Holdings down 72% to 2,931 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Aug 14, 2026
Aug 7, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 880 shares at about $845.12 ($744K), marked as a 10b5-1 plan trade. Holdings down 4% to 20,663 shares.SEC filing
Filed Aug 11, 2026
Aug 7, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 14,091 shares at about $811.25 ($11.4M), marked as a 10b5-1 plan trade. Holdings down 40% to 21,543 shares.SEC filing
Filed Aug 11, 2026
Aug 7, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 7,240 shares at about $781.64 ($5.7M), marked as a 10b5-1 plan trade. Holdings down 17% to 35,634 shares.SEC filing
Filed Aug 11, 2026
Aug 3, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 168 shares at $817.76 ($137K), marked as a 10b5-1 plan trade. Holdings down 1% to 11,920 shares.SEC filing
Filed Aug 4, 2026
Aug 3, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 17,080 shares at about $827.30 ($14.1M), marked as a 10b5-1 plan trade. Holdings down 5% to 295,517 shares.SEC filing
Filed Aug 4, 2026
Aug 3, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 12,920 shares at about $803.47 ($10.4M), marked as a 10b5-1 plan trade. Holdings down 4% to 312,597 shares.SEC filing
Filed Aug 4, 2026
Jul 30, 2026Planned (10b5-1)James CI Lee (EVP & CLO) sold 694 shares at $877.45 ($609K), marked as a 10b5-1 plan trade. Holdings down 67% to 347 shares.SEC filing
Filed Aug 3, 2026
Jul 23, 2026SaleJames CI Lee (EVP & CLO) sold 542 shares at $905.01 ($491K). Holdings down 35% to 1,019 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jul 24, 2026
Jul 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 9,343 shares at about $924.42 ($8.6M), marked as a 10b5-1 plan trade. Holdings down 3% to 311,517 shares.SEC filing
Filed Jul 2, 2026
Jul 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,657 shares at about $910.48 ($18.8M), marked as a 10b5-1 plan trade. Holdings down 6% to 320,860 shares.SEC filing
Filed Jul 2, 2026
Jun 12, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 1,364 shares at $880.19 ($1.2M), marked as a 10b5-1 plan trade. Holdings down 10% to 12,088 shares.SEC filing
Filed Jun 15, 2026
Jun 12, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 989 shares at $880.19 ($871K), marked as a 10b5-1 plan trade. Holdings down 19% to 4,290 shares.SEC filing
Filed Jun 15, 2026
Jun 12, 2026SaleGianluca Romano (CFO) sold 903 shares at $880.19 ($795K). Holdings down 2% to 42,860 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jun 15, 2026
Jun 12, 2026SaleWilliam D. Mosley (CEO and Director) sold 1,768 shares at $880.19 ($1.6M). Holdings down 1% to 327,517 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jun 15, 2026
Jun 10, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 663 shares at $821.86 ($545K), marked as a 10b5-1 plan trade. Holdings down 13% to 4,290 shares.SEC filing
Filed Jun 11, 2026
Jun 10, 2026SaleJohn Christopher Morris (EVP & CTO) sold 574 shares at about $821.65 ($471K). Holdings down 4% to 12,510 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jun 11, 2026
Jun 10, 2026SaleWilliam D. Mosley (CEO and Director) sold 2,855 shares at about $821.74 ($2.3M). Holdings down 1% to 325,966 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jun 11, 2026
Jun 10, 2026SaleGianluca Romano (CFO) sold 1,351 shares at about $821.75 ($1.1M). Holdings down 3% to 42,069 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jun 11, 2026
Jun 4, 2026SaleShankar Arumugavelu (Director) sold 1,000 shares at $927.68 ($928K). Holdings down 13% to 6,626 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Jun 4, 2026
Jun 2, 2026Planned (10b5-1)Prat Bhatt (Director) sold 1,000 shares at $929.88 ($930K), marked as a 10b5-1 plan trade. Holdings down 7% to 12,869 shares.SEC filing
Filed Jun 2, 2026
Jun 1, 2026Planned (10b5-1)Yolanda Lee Conyers (Director) sold 750 shares at $885.33 ($664K), marked as a 10b5-1 plan trade. Holdings down 15% to 4,101 shares.SEC filing
Filed Jun 2, 2026
Jun 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 13,780 shares at about $924.99 ($12.7M), marked as a 10b5-1 plan trade. Holdings down 4% to 323,591 shares.SEC filing
Filed Jun 2, 2026
Jun 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 16,220 shares at about $900.21 ($14.6M), marked as a 10b5-1 plan trade. Holdings down 5% to 337,371 shares.SEC filing
Filed Jun 2, 2026
May 20, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 30,000 shares at about $751.29 ($22.5M), marked as a 10b5-1 plan trade. Holdings down 8% to 339,591 shares.SEC filing
Filed May 21, 2026
May 13–14, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 15,560 shares between May 13 and May 14 at about $815.42 ($12.7M), marked as a 10b5-1 plan trade. Holdings down 81% to 3,691 shares.SEC filing
Filed May 14, 2026
May 7, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 1,902 shares at $770.00 ($1.5M), marked as a 10b5-1 plan trade. Holdings down 4% to 40,945 shares.SEC filing
Filed May 8, 2026
May 6, 2026Planned (10b5-1)Gianluca Romano (CFO) sold 22,488 shares at about $774.22 ($17.4M), marked as a 10b5-1 plan trade. Holdings down 34% to 42,847 shares.SEC filing
Filed May 8, 2026
May 5, 2026SaleStephanie Tilenius (Director) sold 1,580 shares at about $766.62 ($1.2M). Holdings down 13% to 10,664 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed May 6, 2026
May 4, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 5,626 shares at about $738.37 ($4.2M), marked as a 10b5-1 plan trade. Holdings down 32% to 11,954 shares.SEC filing
Filed May 6, 2026
May 4, 2026Planned (10b5-1)James CI Lee (EVP & CLO) sold 697 shares at $741.17 ($517K), marked as a 10b5-1 plan trade. Holdings down 68% to 324 shares.SEC filing
Filed May 6, 2026
Apr 1, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,000 shares at about $420.73 ($8.4M), marked as a 10b5-1 plan trade. Holdings down 5% to 355,591 shares.SEC filing
Filed Apr 2, 2026
Mar 19, 2026SaleWilliam D. Mosley (CEO and Director) sold 24,584 shares at $406.77 ($10.0M). Holdings down 6% to 375,591 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Mar 23, 2026
Mar 13, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 112 shares at $377.44 ($42K), marked as a 10b5-1 plan trade. Holdings down 1% to 17,580 shares.SEC filing
Filed Mar 16, 2026
Mar 2, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,000 shares at about $384.76 ($7.7M), marked as a 10b5-1 plan trade. Holdings down 5% to 395,897 shares.SEC filing
Filed Mar 3, 2026
Mar 2, 2026Planned (10b5-1)Yolanda Lee Conyers (Director) sold 750 shares at $393.59 ($295K), marked as a 10b5-1 plan trade. Holdings down 13% to 4,851 shares.SEC filing
Filed Mar 3, 2026
Feb 24, 2026Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 240 shares at $410.00 ($98K), marked as a 10b5-1 plan trade. Holdings down 1% to 16,566 shares.SEC filing
Filed Feb 25, 2026
Feb 23, 2026SaleKian Fatt Chong (EVP Global Operations) sold 5,846 shares at about $416.48 ($2.4M). Holdings down 100% to 0 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Feb 23, 2026
Feb 2, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,000 shares at about $429.27 ($8.6M), marked as a 10b5-1 plan trade. Holdings down 5% to 410,056 shares.SEC filing
Filed Feb 3, 2026
Jan 30, 2026SaleJay L Geldmacher (Director) sold 925 shares at $448.03 ($414K). Holdings down 81% to 223 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Feb 2, 2026
Jan 29, 2026SaleBan Seng Teh (EVP & Chief Commercial Officer) sold 20,195 shares at about $442.29 ($8.9M). Holdings down 87% to 3,092 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Feb 2, 2026
Jan 26, 2026Planned (10b5-1)James CI Lee (EVP & CLO) sold 673 shares at $348.85 ($235K), marked as a 10b5-1 plan trade. Holdings down 72% to 257 shares.SEC filing
Filed Jan 28, 2026
Jan 12, 2026Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 1,412 shares at $299.31 ($423K), marked as a 10b5-1 plan trade. Holdings down 9% to 13,693 shares.SEC filing
Filed Jan 14, 2026
Jan 2, 2026Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,000 shares at about $285.56 ($5.7M), marked as a 10b5-1 plan trade. Holdings down 4% to 429,895 shares.SEC filing
Filed Jan 6, 2026
Dec 15, 2025Planned (10b5-1)John Christopher Morris (EVP & CTO) sold 113 shares at $291.89 ($33K), marked as a 10b5-1 plan trade. Holdings down 1% to 14,250 shares.SEC filing
Filed Dec 16, 2025
Dec 11, 2025Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 2,010 shares at $295.90 ($595K), marked as a 10b5-1 plan trade. Holdings down 13% to 13,693 shares.SEC filing
Filed Dec 12, 2025
Dec 2, 2025Planned (10b5-1)Yolanda Lee Conyers (Director) sold 750 shares at $272.91 ($205K), marked as a 10b5-1 plan trade. Holdings down 12% to 5,601 shares.SEC filing
Filed Dec 2, 2025
Dec 1, 2025Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,000 shares at about $271.03 ($5.4M), marked as a 10b5-1 plan trade. Holdings down 4% to 445,668 shares.SEC filing
Filed Dec 2, 2025
Nov 13, 2025Planned (10b5-1)Gianluca Romano (CFO) sold 8,002 shares at about $266.69 ($2.1M), marked as a 10b5-1 plan trade. Holdings down 14% to 48,291 shares.SEC filing
Filed Nov 14, 2025
Nov 12, 2025Planned (10b5-1)Gianluca Romano (CFO) sold 54,021 shares at about $285.16 ($15.4M), marked as a 10b5-1 plan trade. Holdings down 49% to 56,293 shares.SEC filing
Filed Nov 14, 2025
Nov 11, 2025Planned (10b5-1)James CI Lee (EVP & CLO) sold 697 shares at $288.98 ($201K), marked as a 10b5-1 plan trade. Holdings down 73% to 257 shares.SEC filing
Filed Nov 12, 2025
Nov 11, 2025Planned (10b5-1)Ban Seng Teh (EVP & Chief Commercial Officer) sold 1,412 shares at $288.98 ($408K), marked as a 10b5-1 plan trade. Holdings down 10% to 12,041 shares.SEC filing
Filed Nov 12, 2025
Nov 10, 2025SaleShankar Arumugavelu (Director) sold 5,000 shares at $294.57 ($1.5M). Holdings down 40% to 7,626 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Nov 12, 2025
Nov 5, 2025SaleBan Seng Teh (EVP & Chief Commercial Officer) sold 6,000 shares at $270.00 ($1.6M). Holdings down 33% to 12,041 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Nov 5, 2025
Nov 3, 2025SaleStephanie Tilenius (Director) sold 2,046 shares at about $266.41 ($545K). Holdings down 14% to 12,244 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Nov 5, 2025
Nov 3, 2025Planned (10b5-1)William D. Mosley (CEO and Director) sold 20,000 shares at about $262.82 ($5.3M), marked as a 10b5-1 plan trade. Holdings down 4% to 465,668 shares.SEC filing
Filed Nov 5, 2025
Oct 31, 2025SaleJay L Geldmacher (Director) sold 1,250 shares at $269.10 ($336K). Holdings down 52% to 1,148 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Nov 3, 2025
Oct 30, 2025SaleKian Fatt Chong (EVP Global Operations) sold 7,078 shares at about $272.14 ($1.9M). Holdings down 100% to 0 shares. Not marked as a 10b5-1 plan trade.SEC filing
Filed Nov 3, 2025

88 routine transactions (such as grants, option exercises or tax withholding) are not listed.

Cluster buys

No cluster buys in the last 12 months.

Red flags

No red flags in the last 12 months.

Key events

No key events in the last 12 months.

8-K filings, last 12 months

No 8-K filings in the last 12 months.

Red flags are objective triggers only: the item or form filed, never an opinion.

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