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Zamiska Gene M.

Disclosed activity across 1 company

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15061
SEC CIK
0001456385

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
WESTERN DIGITAL CORPWDC · Entity 1010SVP & Princ. Acctg OfficerSeptember 18, 2025September 22, 2025

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 18, 2025 · Filed September 22, 2025

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Dividend Equivalent RightsSEC Table II · derivative / convertible securityDirect72.4915 Reported balance After 2025-09-18 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2025-09-18 · Grant · Acquired 26.1267 · Balance 72.4915

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
September 18, 2025 Filed Sep 22, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantDividend Equivalent Rights · Derivative 26.1267 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000210 · edgardoc.xml · derivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72.4915

Underlying: Common Stock · 26.1267 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 28, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 353 $80.90 $28,557.70
Disclosure

SEC source: 0001266824-25-000180 · edgardoc.xml · nonDerivative · entry 3

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,425

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 March 6, 2025.

Read SEC document
August 27, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 1.1776 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000180 · edgardoc.xml · derivative · entry 4

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 46.3648

Underlying: Common Stock · 1.1776 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 27, 2025 Filed Aug 28, 2025 22:26 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 345 $80.67 $27,831.15
Disclosure

SEC source: 0001266824-25-000180 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,778

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 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: 0001266824-25-000180 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,123

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 26, 2025 Filed Aug 27, 2025 21:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 814 $79.10 $64,387.40
Disclosure

SEC source: 0001266824-25-000166 · edgardoc.xml · nonDerivative · entry 3

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,122

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 March 6, 2025.

Read SEC document
August 25, 2025 Filed Aug 27, 2025 21:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 2.7201 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000166 · edgardoc.xml · derivative · entry 4

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 47.5424

Underlying: Common Stock · 2.7201 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 798 $79.22 $63,217.56
Disclosure

SEC source: 0001266824-25-000166 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,936

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 2 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000166 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,734

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 1,828 $74.78 $136,697.84
Disclosure

SEC source: 0001266824-25-000156 · edgardoc.xml · nonDerivative · entry 4

Zamiska Gene M. · CIK 0001456385 · SVP, Global Accounting & Chief

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,732

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 March 6, 2025.

Read SEC document
August 21, 2025 Filed Aug 25, 2025 22:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Exercise / conversionDividend Equivalent Rights · Derivative 6.1142 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000156 · edgardoc.xml · derivative · entry 5

Zamiska Gene M. · CIK 0001456385 · SVP, Global Accounting & Chief

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 50.2625

Underlying: Common Stock · 6.1142 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 SaleCommon Stock 3,160 $75.68 $239,148.80
Disclosure

SEC source: 0001266824-25-000156 · edgardoc.xml · nonDerivative · entry 3

Zamiska Gene M. · CIK 0001456385 · SVP, Global Accounting & Chief

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 31,560

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 March 6, 2025.

Read SEC document
August 21, 2025 Filed Aug 25, 2025 22:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,797 $74.66 $134,164.02
Disclosure

SEC source: 0001266824-25-000156 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP, Global Accounting & Chief

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 34,720

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 6 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000156 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP, Global Accounting & Chief

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,517

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 10.5643 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000146 · edgardoc.xml · derivative · entry 3

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56.3767

Underlying: Common Stock · 10.5643 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 3,102 $75.64 $234,635.28
Disclosure

SEC source: 0001266824-25-000146 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,511

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 9 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000146 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,613

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
June 18, 2025 Filed Jun 23, 2025 22:13 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantDividend Equivalent Rights · Derivative 66.941 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000128 · edgardoc.xml · derivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66.941

Underlying: Common Stock · 66.941 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
June 17, 2025 Filed Jun 17, 2025 23:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 245 $58.01 $14,212.45
Disclosure

SEC source: 0001266824-25-000091 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 39,604

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
June 14, 2025 Filed Jun 17, 2025 23:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 240 $55.70 $13,368.00
Disclosure

SEC source: 0001266824-25-000091 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 39,849

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
June 05, 2025 Filed Jun 6, 2025 21:24 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 1,729 $54.88 $94,887.52
Disclosure

SEC source: 0001266824-25-000087 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 40,089

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
May 27, 2025 Filed May 28, 2025 20:50 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 345 $51.82 $17,877.90
Disclosure

SEC source: 0001266824-25-000085 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,818

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
May 25, 2025 Filed May 28, 2025 20:50 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 797 $50.18 $39,993.46
Disclosure

SEC source: 0001266824-25-000085 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,163

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
May 20, 2025 Filed May 22, 2025 20:58 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 360 $50.63 $18,226.80
Disclosure

SEC source: 0001266824-25-000075 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,960

F1 · 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 12, 2025 Filed Mar 13, 2025 01:32 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 456 $43.37 $19,776.72
Disclosure

SEC source: 0001266824-25-000042 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 43,320

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

Read SEC document
March 07, 2025 Filed Mar 10, 2025 22:12 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 1,659 $41.36 $68,616.24
Disclosure

SEC source: 0001266824-25-000040 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 43,776

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

Read SEC document
March 06, 2025 Filed Mar 10, 2025 22:12 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,116 $41.45 $46,258.20
Disclosure

SEC source: 0001266824-25-000040 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 45,435

F1 · 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 28, 2025 Filed Mar 4, 2025 01:54 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantCommon Stock 5,327 $0.00 $0.00
Disclosure

SEC source: 0001266824-25-000019 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,551

F1 · shares: Represents performance-based restricted stock units that have been earned by the Reporting Person as a result of the deemed satisfaction of the related performance conditions in connection with the Spin-Off (as defined below). These stock units are scheduled to vest on August 20, 2025.

F2 · balance_after: Includes 12,841 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.

Read SEC document
November 29, 2024 Filed Dec 2, 2024 22:13 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 313 $72.63 $22,733.19
Disclosure

SEC source: 0001266824-24-000137 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,383

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

Read SEC document
November 27, 2024 Filed Dec 2, 2024 22:13 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 167 $71.50 $11,940.50
Disclosure

SEC source: 0001266824-24-000137 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,696

F1 · 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 26, 2024 Filed Nov 27, 2024 01:11 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 658 $69.99 $46,053.42
Disclosure

SEC source: 0001266824-24-000131 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,863

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

Read SEC document
November 25, 2024 Filed Nov 27, 2024 01:11 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 450 $69.43 $31,241.25
Disclosure

SEC source: 0001266824-24-000131 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,521

F1 · 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, 2024 Filed Nov 22, 2024 22:28 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 376 $64.47 $24,240.72
Disclosure

SEC source: 0001266824-24-000123 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,971

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

Read SEC document
November 20, 2024 Filed Nov 22, 2024 22:28 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 261 $63.84 $16,662.24
Disclosure

SEC source: 0001266824-24-000123 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 30,347

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

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October 28, 2024 Filed Oct 28, 2024 22:37 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 1,993 $69.94 $139,390.42
Disclosure

SEC source: 0001266824-24-000096 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,608

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September 04, 2024 Filed Sep 5, 2024 00:08 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 2,169 $61.96 $134,391.24
Disclosure

SEC source: 0001266824-24-000085 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,601

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

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September 03, 2024 Filed Sep 5, 2024 00:08 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,145 $63.06 $72,203.70
Disclosure

SEC source: 0001266824-24-000085 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 34,770

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

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August 29, 2024 Filed Aug 30, 2024 21:17 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 315 $63.32 $19,945.80
Disclosure

SEC source: 0001266824-24-000069 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,915

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

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August 27, 2024 Filed Aug 27, 2024 22:48 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,218 $62.85 $76,551.30
Disclosure

SEC source: 0001266824-24-000067 · edgardoc.xml · nonDerivative · entry 3

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,230

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

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August 27, 2024 Filed Aug 27, 2024 22:48 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 2,900 $61.48 $178,287.36
Disclosure

SEC source: 0001266824-24-000067 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 37,448

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

F3 · price: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $61.22 to a high of $61.83. 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.

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August 25, 2024 Filed Aug 27, 2024 22:48 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 1,532 $64.35 $98,584.20
Disclosure

SEC source: 0001266824-24-000067 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 40,348

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

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August 21, 2024 Filed Aug 22, 2024 20:43 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantCommon Stock 3,046 $0.00 $0.00
Disclosure

SEC source: 0001266824-24-000059 · edgardoc.xml · nonDerivative · entry 4

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 41,880

F4 · shares: Represents stock units that have been earned by the Reporting Person as payment in respect of the vesting of performance-based restricted stock units. These shares are scheduled to vest on August 27, 2024.

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August 21, 2024 Filed Aug 22, 2024 20:43 UTC WESTERN DIGITAL CORP WDC · Entity 1010 GrantCommon Stock 9,964 $0.00 $0.00
Disclosure

SEC source: 0001266824-24-000059 · edgardoc.xml · nonDerivative · entry 3

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 38,834

F3 · 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.

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August 21, 2024 Filed Aug 22, 2024 20:43 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 417 $64.89 $27,059.13
Disclosure

SEC source: 0001266824-24-000059 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,870

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

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August 20, 2024 Filed Aug 22, 2024 20:43 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 220 $64.42 $14,172.40
Disclosure

SEC source: 0001266824-24-000059 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,287

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

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June 17, 2024 Filed Jun 18, 2024 21:03 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 219 $78.00 $17,082.00
Disclosure

SEC source: 0001266824-24-000051 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP, Global Accounting & Chief

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,507

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

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June 14, 2024 Filed Jun 17, 2024 21:19 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 115 $78.12 $8,983.80
Disclosure

SEC source: 0001266824-24-000049 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,726

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

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May 29, 2024 Filed May 30, 2024 21:07 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 315 $75.39 $23,747.85
Disclosure

SEC source: 0001266824-24-000039 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,841

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

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May 27, 2024 Filed May 28, 2024 20:47 UTC WESTERN DIGITAL CORP WDC · Entity 1010 Tax withholdingCommon Stock 165 $74.81 $12,343.65
Disclosure

SEC source: 0001266824-24-000036 · edgardoc.xml · nonDerivative · entry 1

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,156

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Read SEC document
May 21, 2024 Filed May 22, 2024 21:12 UTC WESTERN DIGITAL CORP WDC · Entity 1010 SaleCommon Stock 416 $71.88 $29,902.08
Disclosure

SEC source: 0001266824-24-000030 · edgardoc.xml · nonDerivative · entry 2

Zamiska Gene M. · CIK 0001456385 · SVP & Princ. Acctg Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 30,321

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 1, 2023.

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