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Tregillis Cynthia L

Disclosed activity across 1 company

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14219
SEC CIK
0002057088

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
WESTERN DIGITAL CORPWDC · Entity 1010Chief Legal Officer & Corp SecSeptember 17, 2026September 21, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

WESTERN DIGITAL CORP

Report date September 17, 2026 · Filed September 21, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Dividend Equivalent RightsSEC Table II · derivative / convertible securityDirect297.8619 Reported balance After 2026-09-17 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2026-09-17 · Grant · Acquired 27.38 · Balance 297.8619

F1: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

Filing footnotes · ownership attribution and instrument terms

F1: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
March 03, 2026 Filed Mar 6, 2026 00:55 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 23.8133 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000039 · edgardoc.xml · derivative · entry 5

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 304.413

Underlying: Common Stock · 23.8133 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
March 03, 2026 Filed Mar 6, 2026 00:55 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 2,798 $250.61 $701,206.78
Disclosure

SEC source: 0001266824-26-000039 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 131,006

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
March 03, 2026 Filed Mar 6, 2026 00:55 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 23 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000039 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 133,804

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 26, 2026 Filed Feb 27, 2026 21:57 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 214 $286.11 $61,227.54
Disclosure

SEC source: 0001266824-26-000029 · edgardoc.xml · nonDerivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 133,781

F3 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 23, 2025.

Read SEC document
February 25, 2026 Filed Feb 27, 2026 21:57 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 6.5619 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000029 · edgardoc.xml · derivative · entry 4

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 328.2263

Underlying: Common Stock · 6.5619 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 25, 2026 Filed Feb 27, 2026 21:57 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 770 $290.95 $224,031.50
Disclosure

SEC source: 0001266824-26-000029 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 133,995

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
February 25, 2026 Filed Feb 27, 2026 21:57 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 6 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000029 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 134,765

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 24, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 308 $281.70 $86,763.60
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · nonDerivative · entry 6

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 134,759

F3 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 23, 2025.

Read SEC document
February 23, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 130 $283.83 $36,897.90
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · nonDerivative · entry 5

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,067

F3 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 23, 2025.

Read SEC document
February 21, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 9.4399 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · derivative · entry 8

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 334.7882

Underlying: Common Stock · 9.4399 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 21, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,109 $285.52 $316,641.68
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · nonDerivative · entry 4

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,197

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
February 21, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 9 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · nonDerivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 136,306

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 20, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 3.234 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · derivative · entry 7

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 344.2281

Underlying: Common Stock · 3.234 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 20, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 244 $285.52 $69,666.88
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 136,297

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
February 20, 2026 Filed Feb 24, 2026 22:44 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 3 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000021 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 136,541

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
February 06, 2026 Filed Feb 6, 2026 23:09 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 6,780 $270.49 $1,833,922.20
Disclosure

SEC source: 0001266824-26-000009 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 136,538

Read SEC document
January 21, 2026 Filed Jan 21, 2026 22:14 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 447 $229.00 $102,363.00
Disclosure

SEC source: 0001266824-26-000002 · edgardoc.xml · nonDerivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 143,318

F3 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 23, 2025.

Read SEC document
January 20, 2026 Filed Jan 21, 2026 22:14 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 11.1326 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000002 · edgardoc.xml · derivative · entry 4

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 347.4621

Underlying: Common Stock · 11.1326 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
January 20, 2026 Filed Jan 21, 2026 22:14 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 842 $222.97 $187,740.74
Disclosure

SEC source: 0001266824-26-000002 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 143,765

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
January 20, 2026 Filed Jan 21, 2026 22:14 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 11 $0.00 $0.00
Disclosure

SEC source: 0001266824-26-000002 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 144,607

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
December 18, 2025 Filed Dec 22, 2025 21:51 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantDividend Equivalent Rights · Derivative 82.423 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000293 · edgardoc.xml · derivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 358.5947

Underlying: Common Stock · 82.423 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

Read SEC document
December 02, 2025 Filed Dec 3, 2025 23:13 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 2,801 $160.57 $449,751.53
Disclosure

SEC source: 0001266824-25-000261 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 144,596

F1 · balance_after: Includes 65 shares acquired under the Issuer's Employee Stock Purchase Plan on November 30, 2025.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:36 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 5.16 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000257 · edgardoc.xml · derivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 276.1717

Underlying: Common Stock · 5.16 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:36 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 770 $155.41 $119,665.70
Disclosure

SEC source: 0001266824-25-000257 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 147,332

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:36 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 5 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000257 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,102

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
November 21, 2025 Filed Nov 24, 2025 22:45 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 7.4269 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000245 · edgardoc.xml · derivative · entry 6

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 281.3317

Underlying: Common Stock · 7.4269 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
November 21, 2025 Filed Nov 24, 2025 22:45 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,108 $139.19 $154,222.52
Disclosure

SEC source: 0001266824-25-000245 · edgardoc.xml · nonDerivative · entry 4

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,097

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
November 21, 2025 Filed Nov 24, 2025 22:45 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 7 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000245 · edgardoc.xml · nonDerivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,205

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
November 20, 2025 Filed Nov 24, 2025 22:45 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 2.5444 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000245 · edgardoc.xml · derivative · entry 5

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 288.7586

Underlying: Common Stock · 2.5444 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

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November 20, 2025 Filed Nov 24, 2025 22:45 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 379 $140.23 $53,147.17
Disclosure

SEC source: 0001266824-25-000245 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,198

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
November 20, 2025 Filed Nov 24, 2025 22:45 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 2 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000245 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,577

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
October 20, 2025 Filed Oct 21, 2025 22:36 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 8.7586 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000213 · edgardoc.xml · derivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 291.303

Underlying: Common Stock · 8.7586 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
October 20, 2025 Filed Oct 21, 2025 22:36 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,307 $121.53 $158,839.71
Disclosure

SEC source: 0001266824-25-000213 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,575

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
October 20, 2025 Filed Oct 21, 2025 22:36 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 8 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000213 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,882

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
September 18, 2025 Filed Sep 22, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantDividend Equivalent Rights · Derivative 118.2565 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000209 · edgardoc.xml · derivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300.0616

Underlying: Common Stock · 118.2565 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.

Read SEC document
August 27, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 1.1421 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000179 · edgardoc.xml · derivative · entry 4

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181.8051

Underlying: Common Stock · 1.1421 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F2 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F2 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 27, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 266 $80.67 $21,458.22
Disclosure

SEC source: 0001266824-25-000179 · edgardoc.xml · nonDerivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,874

F3 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
August 27, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 1 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000179 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 151,140

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 26, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantCommon Stock 16,554 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000179 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 151,139

F1 · security: Represents the grant of restricted stock units to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
August 25, 2025 Filed Aug 27, 2025 21:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 3.3012 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000165 · edgardoc.xml · derivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 182.9472

Underlying: Common Stock · 3.3012 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 25, 2025 Filed Aug 27, 2025 21:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 769 $79.22 $60,920.18
Disclosure

SEC source: 0001266824-25-000165 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,585

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
August 25, 2025 Filed Aug 27, 2025 21:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 3 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000165 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 135,354

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 22, 2025 Filed Aug 25, 2025 22:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 14,067 $74.78 $1,051,930.26
Disclosure

SEC source: 0001266824-25-000155 · edgardoc.xml · nonDerivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,351

F3 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 23, 2025.

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August 21, 2025 Filed Aug 25, 2025 22:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 18.9863 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000155 · edgardoc.xml · derivative · entry 4

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 186.2484

Underlying: Common Stock · 18.9863 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 21, 2025 Filed Aug 25, 2025 22:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 4,428 $74.66 $330,594.48
Disclosure

SEC source: 0001266824-25-000155 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 149,418

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
August 21, 2025 Filed Aug 25, 2025 22:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 18 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000155 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · Chief Legal Officer & Corp Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 153,846

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 20, 2025 Filed Aug 21, 2025 22:34 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 11.0052 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000145 · edgardoc.xml · derivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · CLO and Corp. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 205.2347

Underlying: Common Stock · 11.0052 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
August 20, 2025 Filed Aug 21, 2025 22:34 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 2,565 $75.64 $194,016.60
Disclosure

SEC source: 0001266824-25-000145 · edgardoc.xml · nonDerivative · entry 2

Tregillis Cynthia L · CIK 0002057088 · CLO and Corp. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 153,828

F2 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
August 20, 2025 Filed Aug 21, 2025 22:34 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionCommon Stock 10 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000145 · edgardoc.xml · nonDerivative · entry 1

Tregillis Cynthia L · CIK 0002057088 · CLO and Corp. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,393

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document
July 20, 2025 Filed Jul 22, 2025 21:27 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 5.6023 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000134 · edgardoc.xml · derivative · entry 3

Tregillis Cynthia L · CIK 0002057088 · CLO and Corp. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 216.2399

Underlying: Common Stock · 5.6023 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.exercise_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

F1 · derivative.expiration_date: The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.