Transactions
116
Insider / WESTERN DIGITAL CORP
Cole Martin I
Director at WESTERN DIGITAL CORP
- Company
- WESTERN DIGITAL CORP
- Ticker
- WDC
- First filing on record
- November 6, 2025
- Latest trade on record
- September 17, 2026
- SEC filings
- EDGAR ↗
Cole Martin I, Director at WESTERN DIGITAL CORP, has disclosed 116 transactions in WDC since November 6, 2025: 0 purchases (0 open-market buys) and 109 sales, worth about $8.1M at the reported prices. The latest was filed September 21, 2026, 4 days after the trade; 1 filing was late against the 2-business-day Form 4 deadline.
Open-market buys
0
Sales
109
Avg. disclosure lag
1.6d
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 Cole Martin I made no purchases and 109 sales worth $8.1M, plus 7 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.
Cole Martin I 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
1 of 12 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 |
|---|---|---|---|---|
| S | Open-market sale | 109 | 30,000 | $8.1M |
| A | Grant or award | 5 | 1,918 | — |
| M | Option exercise or conversion | 2 | 28 | — |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 93 | 0 | 90 · $5.5M |
| 2025 | 23 | 0 | 19 · $2.6M |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| WDC | Other A | September 17, 2026 | September 21, 2026 | 4d | 1 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 32 | $465 | $15K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 160 | $462 | $74K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 199 | $461 | $92K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 248 | $460 | $114K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 529 | $459 | $243K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 328 | $457 | $150K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 312 | $457 | $142K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 304 | $456 | $138K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 128 | $454 | $58K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 144 | $453 | $65K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 106 | $452 | $48K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 70 | $451 | $32K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 39 | $449 | $18K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 41 | $448 | $18K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 32 | $447 | $14K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 32 | $445 | $14K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 32 | $442 | $14K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 96 | $441 | $42K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 64 | $439 | $28K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 118 | $438 | $52K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 154 | $437 | $67K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 32 | $436 | $14K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 64 | $435 | $28K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 112 | $434 | $49K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 38 | $432 | $16K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 115 | $431 | $50K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 103 | $430 | $44K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 93 | $429 | $40K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 115 | $428 | $49K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 64 | $426 | $27K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 32 | $425 | $14K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | July 28, 2026 | July 29, 2026 | 1d | 64 | $424 | $27K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | June 17, 2026 | June 22, 2026 | 5d | 0 | — | — | latederivative | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $545 | $8,719 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $544 | $26K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $543 | $26K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $541 | $8,655 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 32 | $540 | $17K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 57 | $539 | $31K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 71 | $538 | $38K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 112 | $536 | $60K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $535 | $8,558 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $534 | $26K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 96 | $533 | $51K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $532 | $26K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 64 | $530 | $34K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $528 | $25K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 128 | $527 | $67K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $526 | $8,409 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $525 | $25K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 32 | $523 | $17K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 160 | $521 | $83K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $519 | $25K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 216 | $518 | $112K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 112 | $517 | $58K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 392 | $515 | $202K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 296 | $514 | $152K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 316 | $513 | $162K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 310 | $512 | $159K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 326 | $511 | $166K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 32 | $509 | $16K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 96 | $508 | $49K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 96 | $506 | $49K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 80 | $504 | $40K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 128 | $503 | $64K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 64 | $502 | $32K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $500 | $7,995 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $499 | $24K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $497 | $24K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 32 | $495 | $16K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 44 | $494 | $22K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 30 | $492 | $15K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 38 | $491 | $19K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $488 | $7,809 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $487 | $23K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 16 | $486 | $7,769 | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | June 9, 2026 | June 11, 2026 | 2d | 48 | $484 | $23K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | March 18, 2026 | March 19, 2026 | 1d | 1 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 100 | $282 | $28K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 193 | $281 | $54K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 107 | $279 | $30K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 100 | $277 | $28K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 200 | $277 | $55K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 300 | $275 | $82K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 200 | $274 | $55K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 1,100 | $273 | $300K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 1,400 | $272 | $380K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 966 | $270 | $261K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 634 | $269 | $170K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 300 | $268 | $80K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 300 | $266 | $80K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | March 2, 2026 | March 3, 2026 | 1d | 100 | $264 | $26K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Other A | December 18, 2025 | December 22, 2025 | 4d | 1 | — | — | derivative | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 510 | $165 | $84K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 2,539 | $164 | $417K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 451 | $163 | $74K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 400 | $162 | $65K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 900 | $161 | $145K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 600 | $160 | $96K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 500 | $159 | $79K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | December 1, 2025 | December 3, 2025 | 2d | 100 | $158 | $16K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Option / conversion M | November 19, 2025 | November 21, 2025 | 2d | 14 | — | — | derivative | Form 4 ↗ | |
| WDC | Other A | November 20, 2025 | November 21, 2025 | 1d | 1,915 | — | — | Form 4 ↗ | ||
| WDC | Option / conversion M | November 19, 2025 | November 21, 2025 | 2d | 14 | — | — | Form 4 ↗ | ||
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 558 | $165 | $92K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 798 | $164 | $131K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 1,231 | $163 | $201K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 3,303 | $162 | $536K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 960 | $161 | $155K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 982 | $160 | $157K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 551 | $159 | $88K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 833 | $158 | $132K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 419 | $157 | $66K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 221 | $156 | $34K | 10b5-1 plan | Form 4 ↗ | |
| WDC | Sell S | November 5, 2025 | November 6, 2025 | 1d | 144 | $153 | $22K | 10b5-1 plan | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| September 21, 2026 | Form 4 | 0001266824-26-000201 | 1 | published | EDGAR ↗ |
| July 29, 2026 | Form 4 | 0001266824-26-000163 | 30 | published | EDGAR ↗ |
| July 29, 2026 | Form 4 | 0001266824-26-000164 | 2 | published | EDGAR ↗ |
| June 22, 2026 | Form 4 | 0001266824-26-000145 | 1 | published | EDGAR ↗ |
| June 11, 2026 | Form 4 | 0001266824-26-000126 | 30 | published | EDGAR ↗ |
| June 11, 2026 | Form 4 | 0001266824-26-000127 | 14 | published | EDGAR ↗ |
| March 19, 2026 | Form 4 | 0001266824-26-000058 | 1 | published | EDGAR ↗ |
| March 3, 2026 | Form 4 | 0001266824-26-000031 | 14 | published | EDGAR ↗ |
| December 22, 2025 | Form 4 | 0001266824-25-000281 | 1 | published | EDGAR ↗ |
| December 3, 2025 | Form 4 | 0001266824-25-000260 | 8 | published | EDGAR ↗ |
| November 21, 2025 | Form 4 | 0001266824-25-000226 | 3 | published | EDGAR ↗ |
| November 6, 2025 | Form 4 | 0001266824-25-000217 | 11 | published | EDGAR ↗ |
Other insiders at WESTERN DIGITAL CORP
- Tan Irving Chief Executive Officer 102 rows
- Davis Brian Scott Chief Sales & Marketing Office 95 rows
- Tregillis Cynthia L Chief Legal Officer & Corp Sec 84 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 | 12 | 116 | November 6, 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.