Dudediligence.

Western Digital Corporation

WDCNASDAQ · Computer Storage Devices
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Last 12 months

Sales planned on beside the trades reported on , and whether each names a .

Planned ·

$77.8M

45 notices · 260,483 sh

Oct 2025 to Oct 2026

Reported ·

$59.2M

175 sales · 0 buys

Oct 2025 to Jun 2026

The two figures cover different periods.

161 of 175 reported sales carry the 10b5-1 box. Together they are 0.06% of the shares on issue.

PLANNED · FORM 144Oct 2025 to Oct 2026REPORTED · FORM 4Oct 2025 to Jun 2026N2025DJ2026FMAMJJASO2026-09-04: VIDYADHARA K GUBBI, Form 1442026-09-04: CYNTHIA LOCK TREGILLIS, Form 1442026-08-31: STREETER STEPHANIE A, Form 1442026-08-27: CYNTHIA LOCK TREGILLIS, Form 1442026-08-26: CYNTHIA LOCK TREGILLIS, Form 1442026-08-24: CYNTHIA LOCK TREGILLIS, Form 1442026-08-21: CYNTHIA LOCK TREGILLIS, Form 1442026-08-11: IRVING TAN, Form 1442026-07-21: CYNTHIA LOCK TREGILLIS, Form 1442026-06-09: Martin I Cole, Form 1442026-06-05: CYNTHIA LOCK TREGILLIS, Form 1442026-06-01: VIDYADHARA K GUBBI, Form 1442026-05-28: KIDDOO FAMILY TRUST U/A DTD 02/07/2012, Form 1442026-05-27: CYNTHIA LOCK TREGILLIS, Form 1442026-05-22: CYNTHIA LOCK TREGILLIS, Form 1442026-05-21: CYNTHIA LOCK TREGILLIS, Form 1442026-05-11: BRIAN SCOTT DAVIS, Form 1442026-05-04: VIDYADHARA K GUBBI, Form 1442026-05-01: IRVING TAN, Form 1442026-04-21: CYNTHIA LOCK TREGILLIS, Form 1442026-03-06: VIDYADHARA K GUBBI, Form 1442026-03-04: VIDYADHARA K GUBBI, Form 1442026-03-04: CYNTHIA LOCK TREGILLIS, Form 1442026-03-04: CYNTHIA LOCK TREGILLIS, Form 1442026-03-02: Martin I Cole, Form 1442026-02-26: CYNTHIA LOCK TREGILLIS, Form 1442026-02-24: CYNTHIA LOCK TREGILLIS, Form 1442026-02-23: CYNTHIA LOCK TREGILLIS, Form 1442026-02-17: BRIAN SCOTT DAVIS, Form 1442026-02-06: CYNTHIA LOCK TREGILLIS, Form 1442026-02-05: MASSENGILL LIVING TRUST, Form 1442026-02-02: IRVING TAN, Form 1442026-01-21: CYNTHIA LOCK TREGILLIS, Form 1442025-12-05: VIDYADHARA K GUBBI, Form 1442025-12-05: VIDYADHARA K GUBBI, Form 1442025-12-04: VIDYADHARA K GUBBI, Form 1442025-12-04: KIMBERLY ALEXY, Form 1442025-12-02: Cynthia LOCK TREGILLIS, Form 1442025-11-26: GENE M ZAMISKA, Form 1442025-11-25: ROXANNE OULMAN, Form 1442025-11-25: KIMBERLY ALEXY, Form 1442025-11-24: GENE M ZAMISKA, Form 1442025-11-21: GENE M ZAMISKA, Form 1442025-11-05: Martin I Cole, Form 1442025-11-03: IRVING TAN, Form 1442025-11-03: Tan Irving, sold2025-11-05: Cole Martin I, sold2025-11-25: Alexy Kimberly, sold2025-11-25: Oulman Roxanne, sold2025-12-01: Cole Martin I, sold2025-12-02: Tregillis Cynthia L, sold2025-12-04: Alexy Kimberly, sold2025-12-04: Gubbi Vidyadhara K, sold2026-01-21: Tregillis Cynthia L, sold2026-02-02: Tan Irving, sold2026-02-05: MASSENGILL MATTHEW E, sold2026-02-06: Tregillis Cynthia L, sold2026-02-17: Davis Brian Scott, sold2026-02-23: Tregillis Cynthia L, sold2026-02-26: Tregillis Cynthia L, sold2026-03-02: Cole Martin I, sold2026-03-04: Gubbi Vidyadhara K, sold2026-03-04: Tregillis Cynthia L, sold2026-03-06: Gubbi Vidyadhara K, sold2026-04-21: Tregillis Cynthia L, sold2026-05-01: Tan Irving, sold2026-05-04: Gubbi Vidyadhara K, sold2026-05-11: Davis Brian Scott, sold2026-05-21: Tregillis Cynthia L, sold2026-05-22: Tregillis Cynthia L, sold2026-05-28: KIDDOO BRUCE E, sold2026-06-01: Gubbi Vidyadhara K, sold2026-06-05: Tregillis Cynthia L, sold2026-06-09: Cole Martin I, sold2026-06-09: Cole Martin I, sold
under a no plan named▼ salesize is dollars

Form 144 notices, newest first

2026-09-04VIDYADHARA K GUBBI, Chief of Global Operations$825,472
1,795 shno plan dateForm 4s on file end Jun 23144 ↗
2026-09-04CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$194,918
432 shplan 2026-03-06Form 4s on file end Jun 23144 ↗
2026-08-31STREETER STEPHANIE A, ASSOCIATED TO AFFILIATE$4,478,500
10,000 shno plan dateForm 4s on file end Jun 23144 ↗
2026-08-27CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$481,709
1,007 shplan 2026-03-06Form 4s on file end Jun 23144 ↗
2026-08-26CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$214,571
476 shplan 2026-03-06Form 4s on file end Jun 23144 ↗
2026-08-24CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$305,180
684 shplan 2026-03-06Form 4s on file end Jun 23144 ↗
2026-08-21CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$112,158
235 shplan 2026-03-06Form 4s on file end Jun 23144 ↗
2026-08-11IRVING TAN, Chief Executive Officer$8,899,330
20,000 shplan 2026-02-05Form 4s on file end Jun 23144 ↗
2026-07-21CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$427,941
808 shplan 2026-03-06Form 4s on file end Jun 23144 ↗
2026-06-09Martin I Cole, Affiliate$4,215,440
8,000 shplan 2026-03-05144 ↗
Form 4, 2026-06-11: sold 3,280 at $511.16 Form 4 ↗
2026-06-05CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$235,699
432 shplan 2026-03-06144 ↗
Form 4, 2026-06-05: sold 432 at $545.60 Form 4 ↗
2026-06-01VIDYADHARA K GUBBI, Chief of Global Operations$1,376,694
2,475 shno plan date144 ↗
Form 4, 2026-06-02: sold 2,475 at $556.24 Form 4 ↗
2026-05-28KIDDOO FAMILY TRUST U/A DTD 02/07/2012, Director$396,390
750 shno plan date144 ↗
Form 4, 2026-05-29: sold 750 at $528.52 Form 4 ↗
2026-05-27CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$115,481
214 shplan 2025-05-23Form 4s on file end Jun 23144 ↗
2026-05-22CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$150,492
308 shplan 2025-05-23144 ↗
Form 4, 2026-05-27: sold 522 at $509.53 Form 4 ↗
2026-05-21CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$48,640
106 shplan 2025-05-23144 ↗
Form 4, 2026-05-22: sold 106 at $458.87 Form 4 ↗
2026-05-11BRIAN SCOTT DAVIS, Chief Sales & Mrktng Officer$5,006,895
10,000 shplan 2025-11-03144 ↗
Form 4, 2026-05-12: sold 10,000 at $500.69 Form 4 ↗
2026-05-04VIDYADHARA K GUBBI, Chief of Global Operations$2,071,447
4,674 shno plan date144 ↗
Form 4, 2026-05-05: sold 4,674 at $443.19 Form 4 ↗
2026-05-01IRVING TAN, Chief Executive Officer$8,236,864
20,000 shplan 2025-05-12144 ↗
Form 4, 2026-05-05: sold 20,000 at $411.84 Form 4 ↗
2026-04-21CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$136,884
363 shplan 2025-05-23144 ↗
Form 4, 2026-04-22: sold 363 at $377.09 Form 4 ↗
2026-03-06VIDYADHARA K GUBBI, Chief of Global Operations$2,174,858
8,518 shno plan date144 ↗
Form 4, 2026-03-10: sold 8,518 at $255.33 Form 4 ↗
2026-03-04VIDYADHARA K GUBBI, Chief of Global Operations$2,743,110
10,148 shno plan date144 ↗
Form 4, 2026-03-05: sold 10,148 at $270.31 Form 4 ↗
2026-03-04CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$2,300,986
8,547 sh10b5-1 plan144 ↗
Form 4, 2026-03-05: sold 9,324 at $268.28 Form 4 ↗
2026-03-04CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$200,396
777 shplan 2025-05-23no Form 4 on file144 ↗
2026-03-02Martin I Cole, Affiliate$1,693,500
6,000 shplan 2025-08-01144 ↗
Form 4, 2026-03-03: sold 6,000 at $271.67 Form 4 ↗
2026-02-26CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$61,228
214 shplan 2025-05-23144 ↗
Form 4, 2026-02-27: sold 214 at $286.11 Form 4 ↗
2026-02-24CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$86,764
308 shplan 2025-05-23no Form 4 on file144 ↗
2026-02-23CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$36,898
130 shplan 2025-05-23144 ↗
Form 4, 2026-02-24: sold 438 at $282.33 Form 4 ↗
2026-02-17BRIAN SCOTT DAVIS, Chief Sales & Mrktng Officer$2,791,603
10,000 shplan 2025-11-03144 ↗
Form 4, 2026-02-19: sold 10,000 at $279.16 Form 4 ↗
2026-02-06CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$1,833,922
6,780 shno plan date144 ↗
Form 4, 2026-02-06: sold 6,780 at $270.49 Form 4 ↗
2026-02-05MASSENGILL LIVING TRUST, Director$9,948,234
36,926 shplan 2025-11-06144 ↗
Form 4, 2026-02-06: sold 36,926 at $260.43 Form 4 ↗
2026-02-02IRVING TAN, Chief Executive Officer$5,108,832
20,000 shplan 2025-05-12144 ↗
Form 4, 2026-02-04: sold 20,000 at $255.44 Form 4 ↗
2026-01-21CYNTHIA LOCK TREGILLIS, Chief Legal Officer & Corp Sec$102,363
447 shplan 2025-05-23144 ↗
Form 4, 2026-01-21: sold 447 at $229.00 Form 4 ↗
2025-12-05VIDYADHARA K GUBBI, Chief of Global Operations$1,089,813
6,469 shno plan dateno Form 4 on file144 ↗
2025-12-05VIDYADHARA K GUBBI, Chief of Global Operations$413,900
2,474 shno plan dateno Form 4 on file144 ↗
2025-12-04VIDYADHARA K GUBBI, Chief of Global Operations$2,219,508
13,877 shno plan date144 ↗
Form 4, 2025-12-08: sold 22,820 at $163.15 Form 4 ↗
2025-12-04KIMBERLY ALEXY, Director$320,165
2,000 shno plan date144 ↗
Form 4, 2025-12-08: sold 2,000 at $160.08 Form 4 ↗
2025-12-02Cynthia LOCK TREGILLIS, Chief Legal Officer & Corp Sec$449,752
2,801 shno plan date144 ↗
Form 4, 2025-12-03: sold 2,801 at $160.57 Form 4 ↗
2025-11-26GENE M ZAMISKA, SVP & Princ. Acctg Officer$127,822
814 shplan 2025-03-06no Form 4 on file144 ↗
2025-11-25ROXANNE OULMAN, Director$277,956
1,800 shno plan date144 ↗
Form 4, 2025-11-26: sold 1,800 at $154.42 Form 4 ↗
2025-11-25KIMBERLY ALEXY, Director$272,272
1,768 shno plan date144 ↗
Form 4, 2025-11-26: sold 1,768 at $154.00 Form 4 ↗
2025-11-24GENE M ZAMISKA, SVP & Princ. Acctg Officer$65,306
458 shplan 2025-03-06no Form 4 on file144 ↗
2025-11-21GENE M ZAMISKA, SVP & Princ. Acctg Officer$65,286
468 shplan 2025-03-06no Form 4 on file144 ↗
2025-11-05Martin I Cole, Affiliate$2,434,880
16,000 shplan 2025-08-01144 ↗
Form 4, 2025-11-06: sold 10,000 at $161.32 Form 4 ↗
2025-11-03IRVING TAN, Chief Executive Officer$3,013,782
20,000 shplan 2025-05-12144 ↗
Form 4, 2025-11-05: sold 20,000 at $150.69 Form 4 ↗