Sell4

WESTERN DIGITAL CORP

WDC

Total Value

$1.6M

Net $1.6M sold

Filing Date

Oct 30, 2026

12 transactions

Sales

$1.6M

12 transactions

Trade Summary

On Oct 29, 2026, Cole Martin I, Director, sold $1.6M of WESTERN DIGITAL CORP (WDC) across 12 transactions. The filing covers Common Stock and reflects net selling of $1.6M. Reported prices ranged from $390.04 to $401.47. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

WDC daily price with the insider's sale marked at $395.47.

Sold near the 6-month low · the stock trades 7% lower today.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: Cole Martin I
Role: Director
Location: SAN JOSE, CA

Filing Details

Filing Date: Oct 30, 2026
Transaction Date: Oct 29, 2026
Accession Number: 0001266824-26-000219
Form Type: 4
Net Trading Amount: -$1.6M

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Oct 29, 2026	Common Stock	204	$390.04	Sale	$79.6K
Oct 29, 2026	Common Stock	385	$391.05	Sale	$150.6K
Oct 29, 2026	Common Stock	407	$392.42	Sale	$159.7K
Oct 29, 2026	Common Stock	494	$393.22	Sale	$194.3K
Oct 29, 2026	Common Stock	243	$394.41	Sale	$95.8K
Oct 29, 2026	Common Stock	209	$395.30	Sale	$82.6K
Oct 29, 2026	Common Stock	317	$396.31	Sale	$125.6K
Oct 29, 2026	Common Stock	584	$397.48	Sale	$232.1K
Oct 29, 2026	Common Stock	723	$398.45	Sale	$288.1K
Oct 29, 2026	Common Stock	303	$399.36	Sale	$121.0K
Oct 29, 2026	Common Stock	88	$400.33	Sale	$35.2K
Oct 29, 2026	Common Stock	43	$401.47	Sale	$17.3K

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Footnotes

(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Cole Martin I

(Last)

(First)

(Middle)

C/O WESTERN DIGITAL CORPORATION

5601 GREAT OAKS PARKWAY

(Street)

SAN JOSE

95119

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
WESTERN DIGITAL CORP [ WDC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/29/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/29/2026		S⁽¹⁾		204	D	$390.0406⁽²⁾	21,229	D
Common Stock	10/29/2026		S⁽¹⁾		385	D	$391.0458⁽³⁾	20,844	D
Common Stock	10/29/2026		S⁽¹⁾		407	D	$392.4181⁽⁴⁾	20,437	D
Common Stock	10/29/2026		S⁽¹⁾		494	D	$393.2193⁽⁵⁾	19,943	D
Common Stock	10/29/2026		S⁽¹⁾		243	D	$394.4098⁽⁶⁾	19,700	D
Common Stock	10/29/2026		S⁽¹⁾		209	D	$395.3043⁽⁷⁾	19,491	D
Common Stock	10/29/2026		S⁽¹⁾		317	D	$396.3138⁽⁸⁾	19,174	D
Common Stock	10/29/2026		S⁽¹⁾		584	D	$397.4792⁽⁹⁾	18,590	D
Common Stock	10/29/2026		S⁽¹⁾		723	D	$398.4499⁽¹⁰⁾	17,867	D
Common Stock	10/29/2026		S⁽¹⁾		303	D	$399.3569⁽¹¹⁾	17,564	D
Common Stock	10/29/2026		S⁽¹⁾		88	D	$400.3294⁽¹²⁾	17,476	D
Common Stock	10/29/2026		S⁽¹⁾		43	D	$401.4675⁽¹³⁾	17,433	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

	By: /s/ Sandra Garcia Attorney-in-Fact For: Martin Cole	10/30/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Form 4 as rendered by the SEC from accession 0001266824-26-000219.

WESTERN DIGITAL CORP

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

SEC Form 4

Price at the Time of the Trade