Martin I. Cole - 29 Oct 2026 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Reporting relationship: Director
Issuer ticker: WDC
Reported as of: 29 Oct 2026
Net transaction value: -$1,581,881
SEC form: 4
Accepted by SEC: 30 Oct 2026, 18:19:27 UTC
Prior SEC filing: 21 Sep 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Martin Cole

Filing notes and source

Key filing fact

Martin I. Cole filed Form 4 for WESTERN DIGITAL CORP (WDC) on 30 Oct 2026.

Key facts

This page summarizes Martin I. Cole's Form 4 filing for WESTERN DIGITAL CORP (WDC).
12 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 30 Oct 2026, 18:19.

Change

Previous filing in this sequence was filed on 21 Sep 2026.
Current net transaction value: -$1,581,881.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001302874 Primary reporting owner

Cole Martin I

Relationship: Director
Address: C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE
Signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Martin Cole
Signature date: 30 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

WDC transaction

Common Stock

Sale

Transaction value: -$79,568
Shares: -204
Change %: -0.95%
Price: $390.04
Shares after: 21,229
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F2

WDC transaction

Common Stock

Sale

Transaction value: -$150,553
Shares: -385
Change %: -1.8%
Price: $391.05
Shares after: 20,844
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F3

WDC transaction

Common Stock

Sale

Transaction value: -$159,714
Shares: -407
Change %: -2%
Price: $392.42
Shares after: 20,437
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F4

WDC transaction

Common Stock

Sale

Transaction value: -$194,250
Shares: -494
Change %: -2.4%
Price: $393.22
Shares after: 19,943
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F5

WDC transaction

Common Stock

Sale

Transaction value: -$95,842
Shares: -243
Change %: -1.2%
Price: $394.41
Shares after: 19,700
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F6

WDC transaction

Common Stock

Sale

Transaction value: -$82,619
Shares: -209
Change %: -1.1%
Price: $395.30
Shares after: 19,491
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F7

WDC transaction

Common Stock

Sale

Transaction value: -$125,631
Shares: -317
Change %: -1.6%
Price: $396.31
Shares after: 19,174
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F8

WDC transaction

Common Stock

Sale

Transaction value: -$232,128
Shares: -584
Change %: -3%
Price: $397.48
Shares after: 18,590
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F9

WDC transaction

Common Stock

Sale

Transaction value: -$288,079
Shares: -723
Change %: -3.9%
Price: $398.45
Shares after: 17,867
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F10

WDC transaction

Common Stock

Sale

Transaction value: -$121,005
Shares: -303
Change %: -1.7%
Price: $399.36
Shares after: 17,564
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F11

WDC transaction

Common Stock

Sale

Transaction value: -$35,229
Shares: -88
Change %: -0.5%
Price: $400.33
Shares after: 17,476
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F12

WDC transaction

Common Stock

Sale

Transaction value: -$17,263
Shares: -43
Change %: -0.25%
Price: $401.47
Shares after: 17,433
Date: 29 Oct 2026
Ownership: Direct
Footnotes: F1, F13

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 13 footnotes

Footnote F1

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2026.

Footnote F2

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $389.6074 to a high of $390.5492. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F3

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $390.8463 to a high of $391.8300. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F4

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $391.8473 to a high of $392.8400. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F5

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $392.8499 to a high of $393.7911. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F6

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $393.8700 to a high of $394.8682. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F7

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $394.8900 to a high of $395.8721. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F8

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $395.9300 to a high of $396.9100. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F9

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $396.9333 to a high of $397.9274. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F10

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $397.9343 to a high of $398.9000. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F11

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $398.9400 to a high of $399.9200. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F12

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $399.9563 to a high of $400.9500. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F13

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $401.0000 to a high of $401.8100. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.