Matthew E. Massengill - 05 Feb 2026 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Reporting relationship: Director
Issuer ticker: WDC
Reported as of: 05 Feb 2026
Net transaction value: -$9,616,466
SEC form: 4
Accepted by SEC: 06 Feb 2026, 18:09:23 UTC
Prior SEC filing: 22 Dec 2025
Next SEC filing: 19 Mar 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew E. Massengill

Key filing fact

Matthew E. Massengill filed Form 4 for WESTERN DIGITAL CORP (WDC) on 06 Feb 2026.

Key facts

This page summarizes Matthew E. Massengill's Form 4 filing for WESTERN DIGITAL CORP (WDC).
11 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 06 Feb 2026, 18:09.

Change

Previous filing in this sequence was filed on 22 Dec 2025.
Current net transaction value: -$9,616,466.

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 0001232826 Primary reporting owner

MASSENGILL MATTHEW E

Relationship: Director
Address: C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE
Signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew E. Massengill
Signature date: 06 Feb 2026

Reported non-derivative transactions

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

WDC transaction

Common Stock

Sale

Transaction value: $667,241
Shares: -2,600
Change %: -7%
Price: $256.63
Shares after: 34,326
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F2

WDC transaction

Common Stock

Sale

Transaction value: $1,136,649
Shares: -4,411
Change %: -13%
Price: $257.69
Shares after: 29,915
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F3

WDC transaction

Common Stock

Sale

Transaction value: $1,810,703
Shares: -7,000
Change %: -23%
Price: $258.67
Shares after: 22,915
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F4

WDC transaction

Common Stock

Sale

Transaction value: $1,275,896
Shares: -4,915
Change %: -21%
Price: $259.59
Shares after: 18,000
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F5

WDC transaction

Common Stock

Sale

Transaction value: $1,560,037
Shares: -5,987
Change %: -33%
Price: $260.57
Shares after: 12,013
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F6

WDC transaction

Common Stock

Sale

Transaction value: $941,363
Shares: -3,597
Change %: -30%
Price: $261.71
Shares after: 8,416
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F7

WDC transaction

Common Stock

Sale

Transaction value: $604,366
Shares: -2,300
Change %: -27%
Price: $262.77
Shares after: 6,116
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F8

WDC transaction

Common Stock

Sale

Transaction value: $686,429
Shares: -2,600
Change %: -43%
Price: $264.01
Shares after: 3,516
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F9

WDC transaction

Common Stock

Sale

Transaction value: $582,980
Shares: -2,200
Change %: -63%
Price: $264.99
Shares after: 1,316
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F10

WDC transaction

Common Stock

Sale

Transaction value: $243,580
Shares: -916
Change %: -70%
Price: $265.92
Shares after: 400
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F11

WDC transaction

Common Stock

Sale

Transaction value: $107,222
Shares: -400
Change %: -100%
Price: $268.06
Shares after: 0
Date: 05 Feb 2026
Ownership: By Family Trust
Footnotes: F1, F12

WDC holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 28,897
Date: 05 Feb 2026
Ownership: Direct

WDC holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 500
Date: 05 Feb 2026
Ownership: by IRA

^* 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 12 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 November 6, 2025.

Footnote F2

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $256.12 to a high of $257.09. 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 $257.14 to a high of $258.13. 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 $258.14 to a high of $259.13. 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 $259.15 to a high of $260.12. 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 $260.15 to a high of $261.05. 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 $261.19 to a high of $262.18. 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 $262.21 to a high of $263.14. 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 $263.40 to a high of $264.38. 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 $264.54 to a high of $265.51. 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 $265.57 to a high of $266.27. 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 $267.58 to a high of $268.53. 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.