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Nasdaq · USD

WDC

WESTERN DIGITAL CORP

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Tapewire entity
1010
SEC CIK
0000106040
Parsed reports
1,958

Last 12 months

Inside the activity.

0 purchase rows · 224 sale rows

Disclosed non-derivative P/S rows, by transaction month. Includes amendments and private transactions.
Monthly counts
MonthPurchasesSales
Nov 2025019
Dec 2025013
Jan 202601
Feb 2026044
Mar 2026019
Apr 202601
May 2026032
Jun 2026046
Jul 2026033
Aug 2026013
Sep 202603
Oct 202600

Latest available

Insider transactions

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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 dateOwner / reported roleActivity / securityShares / unitsReported priceReported valueDetails
June 05, 2008 Filed Jun 9, 2008 23:18 UTC Exercise / conversionNon-Qualified Stock Option (right to buy) · Derivative 4,000 $0.00 Strike: $7.43 $0.00
Disclosure

SEC source: 0001266824-08-000052 · edgardoc.xml · derivative · entry 3

KIMSEY WILLIAM L · CIK 0001232832 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,437

Underlying: Common Stock · 4,000 shares

Expires 2013-03-13

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_date: The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.

Read SEC document
June 05, 2008 Filed Jun 9, 2008 23:18 UTC SaleCommon Stock 4,000 $40.00 $160,000.00
Disclosure

SEC source: 0001266824-08-000052 · edgardoc.xml · nonDerivative · entry 2

KIMSEY WILLIAM L · CIK 0001232832 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,690

Read SEC document
June 05, 2008 Filed Jun 9, 2008 23:18 UTC Exercise / conversionCommon Stock 4,000 $7.43 $29,720.00
Disclosure

SEC source: 0001266824-08-000052 · edgardoc.xml · nonDerivative · entry 1

KIMSEY WILLIAM L · CIK 0001232832 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,690

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.

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC Exercise / conversionNon-Qualified Stock Option (right to buy) · Derivative 15,000 $0.00 Strike: $4.40 $0.00
Disclosure

SEC source: 0001266824-08-000046 · edgardoc.xml · derivative · entry 4

LAMBERT MICHAEL D · CIK 0001077820 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,000

Underlying: Common Stock · 15,000 shares

Expires 2012-08-01

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_date: The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 3,000 $38.51 $115,530.00
Disclosure

SEC source: 0001266824-08-000046 · edgardoc.xml · nonDerivative · entry 3

LAMBERT MICHAEL D · CIK 0001077820 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,070

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 12,000 $38.50 $462,000.00
Disclosure

SEC source: 0001266824-08-000046 · edgardoc.xml · nonDerivative · entry 2

LAMBERT MICHAEL D · CIK 0001077820 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,070

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC Exercise / conversionCommon Stock 15,000 $4.40 $66,000.00
Disclosure

SEC source: 0001266824-08-000046 · edgardoc.xml · nonDerivative · entry 1

LAMBERT MICHAEL D · CIK 0001077820 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,070

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.

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 2,200 $38.15 $83,930.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 30

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 200 $38.16 $7,632.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 29

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,940

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 2,100 $38.17 $80,157.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 28

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 116,140

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,100 $38.19 $42,009.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 27

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 118,240

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 3,500 $38.21 $133,735.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 26

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 900 $38.22 $34,398.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 25

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,840

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 300 $38.23 $11,469.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 24

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 123,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 2,000 $38.24 $76,480.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 23

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 124,040

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 4,800 $38.25 $183,600.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 22

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 126,040

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,900 $38.26 $72,694.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 21

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 130,840

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 300 $38.27 $11,481.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 20

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 132,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 400 $38.28 $15,310.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 19

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 133,040

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,800 $38.28 $68,904.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 18

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 133,440

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 4,400 $38.29 $168,476.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 17

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 135,240

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 100 $38.30 $3,829.50
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 16

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 139,640

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 3,400 $38.30 $130,220.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 15

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 139,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 800 $38.31 $30,648.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 14

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 143,140

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 600 $38.32 $22,992.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 13

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 143,940

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 800 $38.33 $30,664.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 12

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 144,540

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 400 $38.34 $15,336.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 11

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 145,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 600 $38.35 $23,010.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 10

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 145,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,000 $38.36 $38,360.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 9

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 146,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,000 $38.37 $38,370.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 8

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 147,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 500 $38.38 $19,190.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 7

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,100 $38.39 $42,229.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 6

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,840

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 400 $38.40 $15,360.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 5

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,940

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,900 $38.41 $72,979.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 4

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 150,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 100 $38.42 $3,842.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 3

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 152,240

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 400 $38.51 $15,404.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 2

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 152,340

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,100 $38.54 $42,394.00
Disclosure

SEC source: 0001266824-08-000047 · edgardoc.xml · nonDerivative · entry 1

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 152,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 18,300 $38.00 $695,400.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 19

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,840

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 2,800 $38.01 $106,428.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 18

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,140

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 7,500 $38.02 $285,150.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 17

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,940

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 3,200 $38.03 $121,696.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 16

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 82,440

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 2,400 $38.04 $91,296.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 15

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,640

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 5,475 $38.05 $208,323.75
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 14

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 88,040

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 100 $38.06 $3,805.50
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 13

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 93,515

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 8,125 $38.06 $309,237.50
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 12

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 93,615

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 300 $38.07 $11,419.50
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 11

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,740

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 900 $38.07 $34,263.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 10

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 102,040

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 600 $38.08 $22,848.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 9

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 102,940

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 2,000 $38.09 $76,175.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 8

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 103,540

Read SEC document
June 04, 2008 Filed Jun 5, 2008 22:09 UTC SaleCommon Stock 1,200 $38.09 $45,708.00
Disclosure

SEC source: 0001266824-08-000048 · edgardoc.xml · nonDerivative · entry 7

MASSENGILL MATTHEW E · CIK 0001232826 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 105,540

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.