WDC insider buying and SEC filings, explained
Western Digital Corp. · CIK 106040
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)
$19.0M
Planned sales (10b5-1)
$57.9M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 29, 2026 | Planned (10b5-1) | Martin I Cole (Director) sold 4,000 shares at about $395.47 ($1.6M), marked as a 10b5-1 plan trade. Holdings down 19% to 17,433 shares. | SEC filing Filed Oct 30, 2026, 6:19 PM ET |
| Oct 21, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 807 shares at $380.00 ($307K), marked as a 10b5-1 plan trade. Holdings down 1% to 108,928 shares. | SEC filing Filed Oct 22, 2026, 5:57 PM ET |
| Sep 4, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 432 shares at $451.20 ($195K), marked as a 10b5-1 plan trade. Holdings down <1% to 111,030 shares. | SEC filing Filed Sep 8, 2026 |
| Sep 4, 2026 | Sale | Vidyadhara K Gubbi (Chief of Global Operations) sold 1,795 shares at $459.87 ($825K). Holdings down 2% to 80,571 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 8, 2026 |
| Aug 31–Sep 1, 2026 | Sale | Stephanie A. Streeter (Director) sold 5,600 shares indirectly (by trust) between Aug 31 and Sep 1 at about $449.87 ($2.5M). Holdings by trust down 14% to 34,807 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 2, 2026 |
| Aug 26–27, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 1,483 shares between Aug 26 and Aug 27 at about $469.51 ($696K), marked as a 10b5-1 plan trade. Holdings down 1% to 112,155 shares. | SEC filing Filed Aug 27, 2026 |
| Aug 21–24, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 919 shares between Aug 21 and Aug 24 at about $454.12 ($417K), marked as a 10b5-1 plan trade. Holdings down 1% to 112,146 shares. | SEC filing Filed Aug 24, 2026 |
| Aug 11, 2026 | Planned (10b5-1) | Irving Tan (CEO and Director) sold 20,000 shares at about $444.97 ($8.9M), marked as a 10b5-1 plan trade. Holdings down 3% to 575,966 shares. | SEC filing Filed Aug 12, 2026 |
| Jul 28, 2026 | Planned (10b5-1) | Martin I Cole (Director) sold 192 shares at about $462.77 ($89K), marked as a 10b5-1 plan trade. Holdings down 1% to 21,433 shares. | SEC filing Filed Jul 29, 2026 |
| Jul 28, 2026 | Planned (10b5-1) | Martin I Cole (Director) sold 3,808 shares at about $448.66 ($1.7M), marked as a 10b5-1 plan trade. Holdings down 15% to 21,625 shares. | SEC filing Filed Jul 29, 2026 |
| Jul 21, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 808 shares at $529.63 ($428K), marked as a 10b5-1 plan trade. Holdings down 1% to 114,539 shares. | SEC filing Filed Jul 21, 2026 |
| Jun 9, 2026 | Planned (10b5-1) | Martin I Cole (Director) sold 720 shares at about $536.01 ($386K), marked as a 10b5-1 plan trade. Holdings down 3% to 25,433 shares. | SEC filing Filed Jun 11, 2026 |
| Jun 9, 2026 | Planned (10b5-1) | Martin I Cole (Director) sold 3,280 shares at about $511.16 ($1.7M), marked as a 10b5-1 plan trade. Holdings down 11% to 26,153 shares. | SEC filing Filed Jun 11, 2026 |
| Jun 5, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 432 shares at $545.60 ($236K), marked as a 10b5-1 plan trade. Holdings down <1% to 116,643 shares. | SEC filing Filed Jun 5, 2026 |
| Jun 1, 2026 | Sale | Vidyadhara K Gubbi (Chief of Global Operations) sold 2,475 shares at $556.24 ($1.4M). Holdings down 3% to 85,154 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 2, 2026 |
| May 28, 2026 | Sale | Bruce E. Kiddoo (Director) sold 750 shares at $528.52 ($396K). Holdings down 16% to 3,903 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 29, 2026 |
| May 22–27, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 522 shares between May 22 and May 27 at about $509.53 ($266K), marked as a 10b5-1 plan trade. Holdings down <1% to 117,157 shares. | SEC filing Filed May 27, 2026 |
| May 21, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 106 shares at $458.87 ($49K), marked as a 10b5-1 plan trade. Holdings down <1% to 118,443 shares. | SEC filing Filed May 22, 2026 |
| May 11, 2026 | Planned (10b5-1) | Brian Scott Davis (Chief Sales & Mrktng Officer) sold 10,000 shares at about $500.69 ($5.0M), marked as a 10b5-1 plan trade. Holdings down 9% to 105,564 shares. | SEC filing Filed May 12, 2026 |
| May 4, 2026 | Sale | Vidyadhara K Gubbi (Chief of Global Operations) sold 4,674 shares at $443.19 ($2.1M). Holdings down 5% to 90,041 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 5, 2026 |
| May 1, 2026 | Planned (10b5-1) | Irving Tan (CEO and Director) sold 20,000 shares at about $411.84 ($8.2M), marked as a 10b5-1 plan trade. Holdings down 3% to 598,150 shares. | SEC filing Filed May 5, 2026 |
| Apr 21, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 363 shares at $377.09 ($137K), marked as a 10b5-1 plan trade. Holdings down <1% to 120,023 shares. | SEC filing Filed Apr 22, 2026 |
| Mar 6, 2026 | Sale | Vidyadhara K Gubbi (Chief of Global Operations) sold 8,518 shares at $255.33 ($2.2M). Holdings down 8% to 99,276 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 10, 2026 |
| Mar 4, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 9,324 shares at about $268.28 ($2.5M), marked as a 10b5-1 plan trade. Holdings down 7% to 121,682 shares. | SEC filing Filed Mar 5, 2026 |
| Mar 4, 2026 | Sale | Vidyadhara K Gubbi (Chief of Global Operations) sold 10,148 shares at about $270.31 ($2.7M). Holdings down 9% to 107,794 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 5, 2026 |
| Mar 2, 2026 | Planned (10b5-1) | Martin I Cole (Director) sold 6,000 shares at about $271.67 ($1.6M), marked as a 10b5-1 plan trade. Holdings down 17% to 29,433 shares. | SEC filing Filed Mar 3, 2026 |
| Feb 26, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 214 shares at $286.11 ($61K), marked as a 10b5-1 plan trade. Holdings down <1% to 133,781 shares. | SEC filing Filed Feb 27, 2026 |
| Feb 23–24, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 438 shares between Feb 23 and Feb 24 at about $282.33 ($124K), marked as a 10b5-1 plan trade. Holdings down <1% to 134,759 shares. | SEC filing Filed Feb 24, 2026 |
| Feb 17, 2026 | Planned (10b5-1) | Brian Scott Davis (Chief Sales & Mrktng Officer) sold 10,000 shares at about $279.16 ($2.8M), marked as a 10b5-1 plan trade. Holdings down 8% to 121,792 shares. | SEC filing Filed Feb 19, 2026 |
| Feb 6, 2026 | Sale | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 6,780 shares at $270.49 ($1.8M). Holdings down 5% to 136,538 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 6, 2026 |
| Feb 5, 2026 | Planned (10b5-1) | Matthew E. Massengill (Director) sold 36,926 shares indirectly (by trust) at about $260.43 ($9.6M), marked as a 10b5-1 plan trade. Holdings by trust down 100% to 0 shares. | SEC filing Filed Feb 6, 2026 |
| Feb 2, 2026 | Planned (10b5-1) | Irving Tan (CEO and Director) sold 20,000 shares at about $255.44 ($5.1M), marked as a 10b5-1 plan trade. Holdings down 3% to 623,586 shares. | SEC filing Filed Feb 4, 2026 |
| Jan 21, 2026 | Planned (10b5-1) | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 447 shares at $229.00 ($102K), marked as a 10b5-1 plan trade. Holdings down <1% to 143,318 shares. | SEC filing Filed Jan 21, 2026 |
| Dec 4–5, 2025 | Sale | Vidyadhara K Gubbi (Chief of Global Operations) sold 22,820 shares between Dec 4, 2025 and Dec 5, 2025 at about $163.15 ($3.7M). Holdings down 15% to 126,864 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 8, 2025 |
| Dec 4, 2025 | Sale | Kimberly Alexy (Director) sold 2,000 shares at $160.08 ($320K). Holdings down 56% to 1,585 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 8, 2025 |
| Dec 2, 2025 | Sale | Cynthia L Tregillis (Chief Legal Officer & Corp Sec) sold 2,801 shares at $160.57 ($450K). Holdings down 2% to 144,596 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 3, 2025 |
| Dec 1, 2025 | Planned (10b5-1) | Martin I Cole (Director) sold 6,000 shares at about $162.61 ($976K), marked as a 10b5-1 plan trade. Holdings down 14% to 35,433 shares. | SEC filing Filed Dec 3, 2025 |
| Nov 25, 2025 | Sale | Roxanne Oulman (Director) sold 1,800 shares at $154.42 ($278K). Holdings down 32% to 3,863 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 26, 2025 |
| Nov 25, 2025 | Sale | Kimberly Alexy (Director) sold 1,768 shares at $154.00 ($272K). Holdings down 33% to 3,585 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 26, 2025 |
| Nov 5, 2025 | Planned (10b5-1) | Martin I Cole (Director) sold 10,000 shares at about $161.32 ($1.6M), marked as a 10b5-1 plan trade. Holdings down 20% to 39,504 shares. | SEC filing Filed Nov 6, 2025 |
| Nov 3, 2025 | Planned (10b5-1) | Irving Tan (CEO and Director) sold 20,000 shares at about $150.69 ($3.0M), marked as a 10b5-1 plan trade. Holdings down 3% to 645,467 shares. | SEC filing Filed Nov 5, 2025 |
124 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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