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  4. [Form 4] WESTERN DIGITAL CORP Insider Trading Activity

Western Digital director sells 720 shares under plan

WESTERN DIGITAL CORP director Cole Martin I reported open-market sales of company common stock.

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Form Type
4

Rhea-AI Filing Summary

WESTERN DIGITAL CORP director Cole Martin I reported open-market sales of company common stock. On June 9, 2026, he sold a total of 720 shares in 14 separate transactions at prices generally in the low-to-mid $530s per share. Footnotes state these sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on March 5, 2026, indicating the trades were scheduled in advance rather than timed discretionarily.

Insider Cole Martin I
Role Director
Sold 720 shs ($386K)
Type Security Shares Price Value
Sale Common Stock 48 $528.0733 $25K
Sale Common Stock 64 $530.2675 $34K
Sale Common Stock 48 $531.6167 $26K
Sale Common Stock 96 $533.0133 $51K
Sale Common Stock 48 $533.9733 $26K
Sale Common Stock 16 $534.90 $9K
Sale Common Stock 112 $536.2686 $60K
Sale Common Stock 71 $537.7273 $38K
Sale Common Stock 57 $538.8116 $31K
Sale Common Stock 32 $539.815 $17K
Sale Common Stock 16 $540.96 $9K
Sale Common Stock 48 $542.7867 $26K
Sale Common Stock 48 $543.92 $26K
Sale Common Stock 16 $544.95 $9K
Holdings After Transaction: Common Stock — 25,433 shares (Direct)
Footnotes (13)
  1. F1. Due to SEC rules limiting the number of transactions that can be reported on a single Form 4, this Form 4 is a continuation of the Form 4 filed for the same date listed above.
  2. F2. 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.
  3. F3. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $527.94 to a high of $528.23. 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. F4. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $530.02 to a high of $530.72. 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. F5. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $531.13 to a high of $531.99. 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. F6. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $532.49 to a high of $533.47. 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. F7. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $533.66 to a high of $534.45. 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. F8. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $536.01 to a high of $536.58. 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. F9. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $537.28 to a high of $538.04. 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. F10. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $538.45 to a high of $538.98. 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. F11. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $539.64 to a high of $539.99. 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. F12. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $542.19 to a high of $543.18. 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.
  13. F13. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $543.42 to a high of $544.35. 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.
Shares sold 720 shares Total open-market sales on June 9, 2026
Number of sale transactions 14 transactions Separate open-market trades on June 9, 2026
Highest reported sale price $544.95 per share One of the June 9, 2026 open-market sales
Lowest price range in footnotes $527.94 per share Low end of a weighted-average sale price range
Net buy/sell direction Net sale of 720 shares Transaction summary for this Form 4
10b5-1 plan adoption date March 5, 2026 Date the trading plan was adopted
Rule 10b5-1 trading plan regulatory
"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."
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average sale price financial
"Represents the weighted average sale price per share. These shares were sold in multiple transactions..."
open-market sale financial
"transaction_action": "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
Form 4 regulatory
"Due to SEC rules limiting the number of transactions that can be reported on a single Form 4, this Form 4 is a continuation..."
Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Western Digital (WDC) director Cole Martin I report in this Form 4?
He reported selling 720 shares of Western Digital common stock on June 9, 2026 in 14 open-market transactions. All transactions involved non-derivative common stock and were disclosed as routine sales rather than option exercises or gifts.

At what prices did Cole Martin I sell Western Digital (WDC) shares?
The reported sales occurred at various prices, including specific trades around $544.95, $543.92, and $528.07 per share. Footnotes note weighted-average prices, with individual trades ranging from a low of $527.94 to a high of $544.35 per share.

Was the Western Digital (WDC) insider sale made under a Rule 10b5-1 plan?
Yes. A footnote explains that the sales were effected under a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. Such plans schedule trades in advance, reducing the significance of short-term market timing.

How many transactions did the Western Digital (WDC) director execute in this Form 4?
The filing shows 14 separate open-market sale transactions in Western Digital common stock on June 9, 2026. Each line item reports a share amount and price, with totals summarized as 720 shares sold and no purchases or derivative exercises reported.

Did Cole Martin I buy any Western Digital (WDC) shares in this Form 4?
No. The transaction summary lists 0 buy transactions and 14 sell transactions, for a net sale of 720 shares. There were no reported purchases, option exercises, gifts, or tax-withholding entries in this specific Form 4 disclosure.

Does the Form 4 show any remaining derivative positions for the Western Digital (WDC) director?
The derivativeSummary section is empty in this filing, indicating no derivative transactions, such as stock option exercises or conversions, were reported. All activity involved non-derivative common stock sold in the open market on the transaction date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →
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Accepted by SEC EDGAR
SEC Form 4
FORM 4UNITED 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).
X
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 CALIFORNIA 95119
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
WESTERN DIGITAL CORP [ WDC ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/09/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Common Stock(1)06/09/2026S(2)48D$528.0733(3)26,105D
Common Stock06/09/2026S(2)64D$530.2675(4)26,041D
Common Stock06/09/2026S(2)48D$531.6167(5)25,993D
Common Stock06/09/2026S(2)96D$533.0133(6)25,897D
Common Stock06/09/2026S(2)48D$533.9733(7)25,849D
Common Stock06/09/2026S(2)16D$534.925,833D
Common Stock06/09/2026S(2)112D$536.2686(8)25,721D
Common Stock06/09/2026S(2)71D$537.7273(9)25,650D
Common Stock06/09/2026S(2)57D$538.8116(10)25,593D
Common Stock06/09/2026S(2)32D$539.815(11)25,561D
Common Stock06/09/2026S(2)16D$540.9625,545D
Common Stock06/09/2026S(2)48D$542.7867(12)25,497D
Common Stock06/09/2026S(2)48D$543.92(13)25,449D
Common Stock06/09/2026S(2)16D$544.9525,433D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Due to SEC rules limiting the number of transactions that can be reported on a single Form 4, this Form 4 is a continuation of the Form 4 filed for the same date listed above.
2. 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.
3. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $527.94 to a high of $528.23. 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 $530.02 to a high of $530.72. 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 $531.13 to a high of $531.99. 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 $532.49 to a high of $533.47. 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 $533.66 to a high of $534.45. 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 $536.01 to a high of $536.58. 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 $537.28 to a high of $538.04. 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 $538.45 to a high of $538.98. 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 $539.64 to a high of $539.99. 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 $542.19 to a high of $543.18. 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.
13. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $543.42 to a high of $544.35. 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 Cole06/11/2026
** Signature of Reporting PersonDate
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: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

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