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Western Digital Corp. planned insider sales

In the last twelve months insiders at Western Digital Corp. filed 45 Form 144 notices of planned sales, 229,290 shares worth $74.2 million at the time of filing, from 12 sellers. The latest, filed 29 October 2026: Martin I Cole (affiliate), 4,000 shares worth $1.6 million, planned for around 29 October 2026 through J.P. Morgan Securities LLC.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
29 October 2026Martin I ColeAffiliate4,000$1.6 million29 October 20264,000 shares from 29 October 2026J.P. Morgan Securities LLCCompensationForm 144
21 October 2026Cynthia Lock TregillisOfficer807$306,66021 October 2026807 shares from 21 October 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 September 2026Cynthia Lock TregillisOfficer432$194,9184 September 2026432 shares from 4 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 September 2026Vidyadhara K GubbiOfficer1,795$825,4724 September 20261,795 shares from 4 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
31 August 2026Streeter Stephanie AAssociated To Affiliate10,000$4.5 million31 August 20265,600 shares from 31 August 2026FIDELITY BROKERAGE SERVICES LLCStock AwardForm 144
27 August 2026Cynthia Lock TregillisOfficer1,007$481,70927 August 20261,483 shares from 26 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
26 August 2026Cynthia Lock TregillisOfficer476$214,57126 August 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
24 August 2026Cynthia Lock TregillisOfficer684$305,18024 August 2026684 shares from 24 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 August 2026Cynthia Lock TregillisOfficer235$112,15821 August 2026235 shares from 21 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
11 August 2026Irving TanOfficer, Director20,000$8.9 million11 August 202620,000 shares from 11 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 July 2026Cynthia Lock TregillisOfficer808$427,94121 July 2026808 shares from 21 July 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
9 June 2026Martin I ColeAffiliate8,000$4.2 million9 June 20268,000 shares from 9 June 2026J.P. Morgan Securities LLCCompensationForm 144
5 June 2026Cynthia Lock TregillisOfficer432$235,6995 June 2026432 shares from 5 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
1 June 2026Vidyadhara K GubbiOfficer2,475$1.4 million1 June 20262,475 shares from 1 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
28 May 2026Kiddoo Family Trust U/A DTD 02/07/2012Director750$396,39028 May 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
27 May 2026Cynthia Lock TregillisOfficer214$115,48127 May 2026214 shares from 27 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
22 May 2026Cynthia Lock TregillisOfficer308$150,49222 May 2026414 shares from 21 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 May 2026Cynthia Lock TregillisOfficer106$48,64021 May 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
11 May 2026Brian Scott DavisOfficer10,000$5.0 million11 May 202610,000 shares from 11 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance and Restricted StockForm 144
4 May 2026Vidyadhara K GubbiOfficer4,674$2.1 million4 May 20264,674 shares from 4 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
1 May 2026Irving TanOfficer, Director20,000$8.2 million1 May 202620,000 shares from 1 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 April 2026Cynthia Lock TregillisOfficer363$136,88421 April 2026363 shares from 21 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
6 March 2026Vidyadhara K GubbiOfficer8,518$2.2 million6 March 20268,518 shares from 6 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 March 2026Cynthia Lock TregillisOfficer777$200,3964 March 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 March 2026Cynthia Lock TregillisOfficer8,547$2.3 million4 March 20269,324 shares from 4 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 March 2026Vidyadhara K GubbiOfficer10,148$2.7 million4 March 202610,148 shares from 4 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
2 March 2026Martin I ColeAffiliate6,000$1.7 million2 March 20266,000 shares from 2 March 2026J.P. Morgan Securities LLCCompensationForm 144
26 February 2026Cynthia Lock TregillisOfficer214$61,22826 February 2026214 shares from 26 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
24 February 2026Cynthia Lock TregillisOfficer308$86,76424 February 2026438 shares from 23 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
23 February 2026Cynthia Lock TregillisOfficer130$36,89823 February 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
17 February 2026Brian Scott DavisOfficer10,000$2.8 million17 February 202610,000 shares from 17 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Restricted StockForm 144
6 February 2026Cynthia Lock TregillisOfficer6,780$1.8 million6 February 20266,780 shares from 6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
5 February 2026Massengill Living TrustDirector36,926$9.9 million5 February 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
2 February 2026Irving TanOfficer, Director20,000$5.1 million2 February 202620,000 shares from 2 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 January 2026Cynthia Lock TregillisOfficer447$102,36321 January 2026447 shares from 21 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
5 December 2025Vidyadhara K GubbiOfficer2,474$413,9005 December 2025No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
5 December 2025Vidyadhara K GubbiOfficer6,469$1.1 million5 December 202522,820 shares from 4 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Performance Shares; Restricted StockForm 144
4 December 2025Kimberly AlexyDirector2,000$320,1654 December 20252,000 shares from 4 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 December 2025Vidyadhara K GubbiOfficer13,877$2.2 million4 December 2025No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Performance Shares; Restricted StockForm 144
2 December 2025Cynthia LOCK TREGILLISOfficer2,801$449,7522 December 20252,801 shares from 2 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance Shares; Restricted StockForm 144
26 November 2025Gene M ZamiskaOfficer814$127,82226 November 2025No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
25 November 2025Kimberly AlexyDirector1,768$272,27225 November 20251,768 shares from 25 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
25 November 2025Roxanne OulmanDirector1,800$277,95625 November 20251,800 shares from 25 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
24 November 2025Gene M ZamiskaOfficer458$65,30624 November 2025No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 November 2025Gene M ZamiskaOfficer468$65,28621 November 2025No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?