Transactions
84
Insider / WESTERN DIGITAL CORP
Tregillis Cynthia L
Chief Legal Officer & Corp Sec at WESTERN DIGITAL CORP
- Company
- WESTERN DIGITAL CORP
- Ticker
- WDC
- First filing on record
- October 21, 2025
- Latest trade on record
- September 17, 2026
- SEC filings
- EDGAR ↗
Tregillis Cynthia L, Chief Legal Officer & Corp Sec at WESTERN DIGITAL CORP, has disclosed 84 transactions in WDC since October 21, 2025: 0 purchases (0 open-market buys) and 39 sales, worth about $14.2M at the reported prices. The latest was filed September 21, 2026, 4 days after the trade; 5 filings were late against the 2-business-day Form 4 deadline.
Open-market buys
0
Sales
39
Avg. disclosure lag
2.1d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Tregillis Cynthia L made no purchases and 38 sales worth $14M, plus 43 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Tregillis Cynthia L has traded 1 stock on record; the largest by dollars is WDC.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
3 of 21 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| M | Option exercise or conversion | 40 | 333 | — |
| F | Shares withheld for tax | 20 | 19,491 | $6.7M |
| S | Open-market sale | 19 | 25,069 | $7.5M |
| A | Grant or award | 5 | 4,047 | — |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 70 | 0 | 34 · $13.3M |
| 2025 | 14 | 0 | 5 · $936K |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| WDC | Other A | September 17, 2026 | September 21, 2026 | 4d | 27 | — | — | derivative | Form 4 ↗ | |
| WDC | Option / conversion M | September 3, 2026 | September 8, 2026 | 5d | 7 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | September 4, 2026 | September 8, 2026 | 4d | 432 | $451 | $195K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | September 3, 2026 | September 8, 2026 | 5d | 700 | $442 | $309K | late10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | September 3, 2026 | September 8, 2026 | 5d | 7 | — | — | late10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | August 26, 2026 | August 27, 2026 | 1d | 9 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Option / conversion M | August 25, 2026 | August 27, 2026 | 2d | 8 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | August 27, 2026 | August 27, 2026 | 0d | 1,007 | $478 | $482K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | August 26, 2026 | August 27, 2026 | 1d | 1,631 | $469 | $765K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | August 26, 2026 | August 27, 2026 | 1d | 9 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | August 26, 2026 | August 27, 2026 | 1d | 476 | $451 | $215K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | August 25, 2026 | August 27, 2026 | 2d | 3,878 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | August 25, 2026 | August 27, 2026 | 2d | 771 | $451 | $348K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | August 25, 2026 | August 27, 2026 | 2d | 7 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | August 21, 2026 | August 24, 2026 | 3d | 11 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Option / conversion M | August 20, 2026 | August 24, 2026 | 4d | 4 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | August 24, 2026 | August 24, 2026 | 0d | 684 | $446 | $305K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | August 21, 2026 | August 24, 2026 | 3d | 1,109 | $459 | $510K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | August 21, 2026 | August 24, 2026 | 3d | 11 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | August 21, 2026 | August 24, 2026 | 3d | 235 | $477 | $112K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | August 20, 2026 | August 24, 2026 | 4d | 379 | $469 | $178K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | August 20, 2026 | August 24, 2026 | 4d | 3 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | July 20, 2026 | July 21, 2026 | 1d | 13 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | July 21, 2026 | July 21, 2026 | 0d | 808 | $530 | $428K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | July 20, 2026 | July 21, 2026 | 1d | 1,309 | $487 | $638K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | July 20, 2026 | July 21, 2026 | 1d | 13 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | June 17, 2026 | June 22, 2026 | 5d | 19 | — | — | latederivative | Form 4 ↗ | |
| WDC | Option / conversion M | June 3, 2026 | June 5, 2026 | 2d | 7 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | June 5, 2026 | June 5, 2026 | 0d | 432 | $546 | $236K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | June 3, 2026 | June 5, 2026 | 2d | 699 | $594 | $415K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | June 3, 2026 | June 5, 2026 | 2d | 6 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | May 25, 2026 | May 27, 2026 | 2d | 7 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | May 27, 2026 | May 27, 2026 | 0d | 214 | $540 | $115K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | May 25, 2026 | May 27, 2026 | 2d | 771 | $484 | $373K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | May 25, 2026 | May 27, 2026 | 2d | 7 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | May 22, 2026 | May 27, 2026 | 5d | 308 | $489 | $150K | late10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | May 21, 2026 | May 22, 2026 | 1d | 11 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Option / conversion M | May 20, 2026 | May 22, 2026 | 2d | 4 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | May 21, 2026 | May 22, 2026 | 1d | 106 | $459 | $49K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | May 21, 2026 | May 22, 2026 | 1d | 1,108 | $486 | $539K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | May 21, 2026 | May 22, 2026 | 1d | 10 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | May 20, 2026 | May 22, 2026 | 2d | 379 | $460 | $174K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | May 20, 2026 | May 22, 2026 | 2d | 3 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | April 20, 2026 | April 22, 2026 | 2d | 12 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | April 21, 2026 | April 22, 2026 | 1d | 363 | $377 | $137K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | April 20, 2026 | April 22, 2026 | 2d | 1,308 | $374 | $489K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | April 20, 2026 | April 22, 2026 | 2d | 12 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | March 18, 2026 | March 19, 2026 | 1d | 41 | — | — | derivative | Form 4 ↗ | |
| WDC | Option / conversion M | March 3, 2026 | March 5, 2026 | 2d | 24 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | March 4, 2026 | March 5, 2026 | 1d | 8,547 | $269 | $2.3M | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 4, 2026 | March 5, 2026 | 1d | 777 | $258 | $200K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | March 3, 2026 | March 5, 2026 | 2d | 2,798 | $251 | $701K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | March 3, 2026 | March 5, 2026 | 2d | 23 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | February 25, 2026 | February 27, 2026 | 2d | 7 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | February 26, 2026 | February 27, 2026 | 1d | 214 | $286 | $61K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | February 25, 2026 | February 27, 2026 | 2d | 770 | $291 | $224K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | February 25, 2026 | February 27, 2026 | 2d | 6 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | February 21, 2026 | February 24, 2026 | 3d | 9 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Option / conversion M | February 20, 2026 | February 24, 2026 | 4d | 3 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | February 24, 2026 | February 24, 2026 | 0d | 308 | $282 | $87K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | February 23, 2026 | February 24, 2026 | 1d | 130 | $284 | $37K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | February 21, 2026 | February 24, 2026 | 3d | 1,109 | $286 | $317K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | February 21, 2026 | February 24, 2026 | 3d | 9 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | February 20, 2026 | February 24, 2026 | 4d | 244 | $286 | $70K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | February 20, 2026 | February 24, 2026 | 4d | 3 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | February 6, 2026 | February 6, 2026 | 0d | 6,780 | $270 | $1.8M | Form 4 ↗ | ||
| WDC | Option / conversion M | January 20, 2026 | January 21, 2026 | 1d | 11 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| WDC | Sell S | January 21, 2026 | January 21, 2026 | 0d | 447 | $229 | $102K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell F | January 20, 2026 | January 21, 2026 | 1d | 842 | $223 | $188K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | January 20, 2026 | January 21, 2026 | 1d | 11 | — | — | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | December 18, 2025 | December 22, 2025 | 4d | 82 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell S | December 2, 2025 | December 3, 2025 | 1d | 2,801 | $161 | $450K | Form 4 ↗ | ||
| WDC | Option / conversion M | November 25, 2025 | November 26, 2025 | 1d | 5 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell F | November 25, 2025 | November 26, 2025 | 1d | 770 | $155 | $120K | Form 4 ↗ | ||
| WDC | Option / conversion M | November 25, 2025 | November 26, 2025 | 1d | 5 | — | — | Form 4 ↗ | ||
| WDC | Option / conversion M | November 21, 2025 | November 24, 2025 | 3d | 7 | — | — | derivative | Form 4 ↗ | |
| WDC | Option / conversion M | November 20, 2025 | November 24, 2025 | 4d | 3 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell F | November 21, 2025 | November 24, 2025 | 3d | 1,108 | $139 | $154K | Form 4 ↗ | ||
| WDC | Option / conversion M | November 21, 2025 | November 24, 2025 | 3d | 7 | — | — | Form 4 ↗ | ||
| WDC | Sell F | November 20, 2025 | November 24, 2025 | 4d | 379 | $140 | $53K | Form 4 ↗ | ||
| WDC | Option / conversion M | November 20, 2025 | November 24, 2025 | 4d | 2 | — | — | Form 4 ↗ | ||
| WDC | Option / conversion M | October 20, 2025 | October 21, 2025 | 1d | 9 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell F | October 20, 2025 | October 21, 2025 | 1d | 1,307 | $122 | $159K | Form 4 ↗ | ||
| WDC | Option / conversion M | October 20, 2025 | October 21, 2025 | 1d | 8 | — | — | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| September 21, 2026 | Form 4 | 0001266824-26-000214 | 1 | published | EDGAR ↗ |
| September 8, 2026 | Form 4 | 0001266824-26-000199 | 4 | published | EDGAR ↗ |
| August 27, 2026 | Form 4 | 0001266824-26-000188 | 9 | published | EDGAR ↗ |
| August 24, 2026 | Form 4 | 0001266824-26-000174 | 8 | published | EDGAR ↗ |
| July 21, 2026 | Form 4 | 0001266824-26-000160 | 4 | published | EDGAR ↗ |
| June 22, 2026 | Form 4 | 0001266824-26-000158 | 1 | published | EDGAR ↗ |
| June 5, 2026 | Form 4 | 0001266824-26-000121 | 4 | published | EDGAR ↗ |
| May 27, 2026 | Form 4 | 0001266824-26-000107 | 5 | published | EDGAR ↗ |
| May 22, 2026 | Form 4 | 0001266824-26-000099 | 7 | published | EDGAR ↗ |
| April 22, 2026 | Form 4 | 0001266824-26-000079 | 4 | published | EDGAR ↗ |
| March 19, 2026 | Form 4 | 0001266824-26-000069 | 1 | published | EDGAR ↗ |
| March 5, 2026 | Form 4 | 0001266824-26-000039 | 5 | published | EDGAR ↗ |
| February 27, 2026 | Form 4 | 0001266824-26-000029 | 4 | published | EDGAR ↗ |
| February 24, 2026 | Form 4 | 0001266824-26-000021 | 8 | published | EDGAR ↗ |
| February 6, 2026 | Form 4 | 0001266824-26-000009 | 1 | published | EDGAR ↗ |
| January 21, 2026 | Form 4 | 0001266824-26-000002 | 4 | published | EDGAR ↗ |
| December 22, 2025 | Form 4 | 0001266824-25-000293 | 1 | published | EDGAR ↗ |
| December 3, 2025 | Form 4 | 0001266824-25-000261 | 1 | published | EDGAR ↗ |
| November 26, 2025 | Form 4 | 0001266824-25-000257 | 3 | published | EDGAR ↗ |
| November 24, 2025 | Form 4 | 0001266824-25-000245 | 6 | published | EDGAR ↗ |
| October 21, 2025 | Form 4 | 0001266824-25-000213 | 3 | published | EDGAR ↗ |
Other insiders at WESTERN DIGITAL CORP
- Cole Martin I Director 116 rows
- Tan Irving Chief Executive Officer 102 rows
- Davis Brian Scott Chief Sales & Marketing Office 95 rows
- Gubbi Vidyadhara K Chief of Global Operations 65 rows
- Shihab Ahmed Mohammed Chief Product Officer 17 rows
- MASSENGILL MATTHEW E Director 16 rows
- Sennesael Kris Chief Financial Officer 14 rows
- Oulman Roxanne Director 13 rows
- KIDDOO BRUCE E Director 11 rows
- STREETER STEPHANIE A Director 10 rows
Everyone on file, with contracts and lobbying under the company's name: WESTERN DIGITAL CORP.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Rule 10b5-1 trading plans The plan must be set up when the insider has no important non-public information.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 21 | 84 | October 21, 2025 | September 21, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.