| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Cole Martin I | Director | C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE | By: /s/ Sandra Garcia Attorney-in-Fact For: Martin I. Cole | 06 Nov 2025 | 0001302874 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WDC | Common Stock | Sale | $22,031 | -144 | -0.29% | $152.99 | 49,360 | 05 Nov 2025 | Direct | F1, F2 |
| transaction | WDC | Common Stock | Sale | $34,425 | -221 | -0.45% | $155.77 | 49,139 | 05 Nov 2025 | Direct | F1, F3 |
| transaction | WDC | Common Stock | Sale | $65,786 | -419 | -0.85% | $157.01 | 48,720 | 05 Nov 2025 | Direct | F1, F4 |
| transaction | WDC | Common Stock | Sale | $131,632 | -833 | -1.7% | $158.02 | 47,887 | 05 Nov 2025 | Direct | F1, F5 |
| transaction | WDC | Common Stock | Sale | $87,696 | -551 | -1.2% | $159.16 | 47,336 | 05 Nov 2025 | Direct | F1, F6 |
| transaction | WDC | Common Stock | Sale | $157,360 | -982 | -2.1% | $160.24 | 46,354 | 05 Nov 2025 | Direct | F1, F7 |
| transaction | WDC | Common Stock | Sale | $154,861 | -960 | -2.1% | $161.31 | 45,394 | 05 Nov 2025 | Direct | F1, F8 |
| transaction | WDC | Common Stock | Sale | $535,669 | -3,303 | -7.3% | $162.18 | 42,091 | 05 Nov 2025 | Direct | F1, F9 |
| transaction | WDC | Common Stock | Sale | $200,752 | -1,231 | -2.9% | $163.08 | 40,860 | 05 Nov 2025 | Direct | F1, F10 |
| transaction | WDC | Common Stock | Sale | $130,937 | -798 | -2% | $164.08 | 40,062 | 05 Nov 2025 | Direct | F1, F11 |
| transaction | WDC | Common Stock | Sale | $92,065 | -558 | -1.4% | $164.99 | 39,504 | 05 Nov 2025 | Direct | F1, F12 |
Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.
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).
| Id | Content |
|---|---|
| F1 | The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 1, 2025. |
| F2 | Includes 1,701 additional stock units acquired by the Reporting Person in connection with the Issuer's spin-off (the "Spin-Off") of a then-wholly owned subsidiary of the Issuer on February 21, 2025. Pursuant to an Employee Matters Agreement, at the effective time of the Spin-Off, each outstanding Issuer stock unit was adjusted and converted into additional stock units based on the equity conversion ratio of 1.452526 per every Issuer stock unit. |
| F3 | Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $155.5927 to a high of $156.51. 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. |
| F4 | Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $156.59 to a high of $157.58. 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. |
| F5 | Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $157.59 to a high of $158.55. 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 $158.60 to a high of $159.54. 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 $159.69 to a high of $160.6804. 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 $160.70 to a high of $161.69. 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 $161.70 to a high of $162.69. 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 $162.70 to a high of $163.68. 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 $163.70 to a high of $164.68. 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 $164.71 to a high of $165.35. 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. |