Key facts
- This page summarizes Cynthia L. Tregillis's Form 4 filing for WESTERN DIGITAL CORP (WDC).
- 9 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 27 Aug 2026, 20:05.
Cynthia L. Tregillis - 25 Aug 2026 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)
- Reporting relationship
- Chief Legal Officer & Corp Sec
- Issuer ticker
- WDC
- Reported as of
- 25 Aug 2026
- Net transaction value
- -$696,280
- SEC form
- 4
- Accepted by SEC
- 27 Aug 2026, 20:05:46 UTC
- Prior SEC filing
- 24 Aug 2026
- Source filing
- View source filing
- Reporting owner signature
- By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Cynthia L. Tregillis filed Form 4 for WESTERN DIGITAL CORP (WDC) on 27 Aug 2026.
Change
- Previous filing in this sequence was filed on 24 Aug 2026.
- Current net transaction value: -$696,280.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002057088
Primary reporting owner
Tregillis Cynthia L
- Relationship
- Chief Legal Officer & Corp Sec
- Address
- C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE
- Signature
- By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis
- Signature date
- 27 Aug 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
WDC
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +7
- Change %
- +0.01%
- Price
- $0.000000*
- Shares after
- 112,153
- Date
- 25 Aug 2026
- Ownership
- Direct
- Footnotes
- F1
WDC
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -771
- Change %
- -0.69%
- Price
- $450.75*
- Shares after
- 111,382
- Date
- 25 Aug 2026
- Ownership
- Direct
- Footnotes
- F2
WDC
transaction
Common Stock
Award
- Transaction value
- Shares
- +3,878
- Change %
- +3.5%
- Price
- $0.000000*
- Shares after
- 115,260
- Date
- 25 Aug 2026
- Ownership
- Direct
- Footnotes
- F3
WDC
transaction
Common Stock
Sale
- Transaction value
- $214,571
- Shares
- -476
- Change %
- -0.41%
- Price
- $450.78
- Shares after
- 114,784
- Date
- 26 Aug 2026
- Ownership
- Direct
- Footnotes
- F4
WDC
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +9
- Change %
- +0.01%
- Price
- $0.000000*
- Shares after
- 114,793
- Date
- 26 Aug 2026
- Ownership
- Direct
- Footnotes
- F1
WDC
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -1,631
- Change %
- -1.4%
- Price
- $468.88*
- Shares after
- 113,162
- Date
- 26 Aug 2026
- Ownership
- Direct
- Footnotes
- F2
WDC
transaction
Common Stock
Sale
- Transaction value
- $481,709
- Shares
- -1,007
- Change %
- -0.89%
- Price
- $478.36
- Shares after
- 112,155
- Date
- 27 Aug 2026
- Ownership
- Direct
- Footnotes
- F4
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
WDC
transaction
Derivative
Dividend Equivalent Rights
Options Exercise
- Transaction value
- Shares
- -8
- Change %
- -2.6%
- Price
- $0.000000*
- Shares after
- 287
- Date
- 25 Aug 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 8
- Exercise price
- Footnotes
- F1
WDC
transaction
Derivative
Dividend Equivalent Rights
Options Exercise
- Transaction value
- Shares
- -9
- Change %
- -3.3%
- Price
- $0.000000*
- Shares after
- 278
- Date
- 26 Aug 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 9
- Exercise price
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 4 footnotes
Footnote F1
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.
Footnote F2
Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).
Footnote F3
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.
Footnote F4
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, 2026.