SEC Form 4
Western Digital Corp. (WDC) insider trading
In the 12 months to Oct 23, 2026, 10 WDC insiders reported open-market sales of $75.3M across 40 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $75.3M
- 40 filings · 10 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 27 of 40
- $56.3M of $75.3M sold (75%)
Who traded WDC, and when
- Sale
- Sale, pre-arranged (10b5-1)
WDC daily close from Oct 23, 2025 to Oct 22, 2026, between $124.92 and $746.23, last $354.19. 40 sale and 0 purchase filings by 10 insiders, marked at their filing dates. Irving Tan, Chief Executive Officer: sold $25.3M across 4 filings, first filed Nov 5, 2025, last Aug 12, 2026. Vidyadhara K. Gubbi, Chief of Global Operations: sold $12.9M across 6 filings, first filed Dec 8, 2025, last Sep 8, 2026. Matthew E. Massengill, Director: sold $9.6M across 1 filing, first filed Feb 6, 2026, last Feb 6, 2026. Martin I. Cole, Director: sold $8.1M across 7 filings, first filed Nov 6, 2025, last Jul 29, 2026. Cynthia L. Tregillis, Chief Legal Officer & Corp Sec: sold $7.8M across 15 filings, first filed Dec 3, 2025, last Oct 22, 2026. Brian Scott Davis, Chief Sales & Mrktng Officer: sold $7.8M across 2 filings, first filed Feb 19, 2026, last May 12, 2026. 4 others: sold $3.8M across 5 filings, first filed Nov 26, 2025, last Sep 2, 2026.
Largest mark · tap a row for others
Matthew E. Massengill · Director
Sale $9,616,466
36,926 shares at $260.43 avg
Filed Feb 6, 2026 · traded Feb 5
Pre-arranged (10b5-1) · close on filing date $282.58
Irving Tan · Chief Executive Officer
Chief Executive Officer
$25.3M soldVidyadhara K. Gubbi · Chief of Global Operations
Chief of Global Operations
$12.9M soldMatthew E. Massengill · Director
Director
$9.6M soldMartin I. Cole · Director
Director
$8.1M soldCynthia L. Tregillis · Chief Legal Officer & Corp Sec
Chief Legal Officer & Corp Sec
$7.8M soldBrian Scott Davis · Chief Sales & Mrktng Officer
Chief Sales & Mrktng Officer
$7.8M sold4 others
Combined, one mark per week
$3.8M soldHas Western Digital Corp.'s CEO sold stock?
Yes. Irving Tan (CEO) sold 80,000 shares ($25.3M) between Nov 2025 and Aug 2026, all under a pre-arranged 10b5-1 plan.
Open-market trades
40 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Irving Tan | Chief Executive Officer | $25.3M | — | 4 | 100% of sales | |
| Vidyadhara K. Gubbi | Chief of Global Operations | $12.9M | — | 6 | — | |
| Matthew E. Massengill | Director | $9.6M | — | 1 | 100% of sales | |
| Martin I. Cole | Director | $8.1M | — | 7 | 100% of sales | |
| Cynthia L. Tregillis | Chief Legal Officer & Corp Sec | $7.8M | — | 15 | 71% of sales | |
| Brian Scott Davis | Chief Sales & Mrktng Officer | $7.8M | — | 2 | 100% of sales | |
| Stephanie A. Streeter | Director | $2.5M | — | 1 | — | |
| Kimberly Alexy | Director | $592.4K | — | 2 | — | |
| Bruce E. Kiddoo | Director | $396.4K | — | 1 | — | |
| Roxanne Oulman | Director | $278.0K | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 807 | $380.00 | $306.7K | 108,928 | |
traded | Vidyadhara K. Gubbi Chief of Global Operations | Sale | 1,795 | $459.87 | $825.5K | 80,571 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 432 | $451.20 | $194.9K | 111,030 | |
traded | Stephanie A. Streeter Director | Sale | 5,600 | $449.87 | $2.5M | 34,807 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 1,483 | $469.51 | $696.3K | 112,155 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 919 | $454.12 | $417.3K | 112,146 | |
traded | Irving Tan Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $444.97 | $8.9M | 577,512 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 3,808 | $448.66 | $1.7M | 21,625 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 192 | $462.77 | $88.9K | 21,433 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 808 | $529.63 | $427.9K | 114,539 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 3,280 | $511.16 | $1.7M | 28,553 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 720 | $536.01 | $385.9K | 25,561 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 432 | $545.60 | $235.7K | 116,643 | |
traded | Vidyadhara K. Gubbi Chief of Global Operations | Sale | 2,475 | $556.24 | $1.4M | 85,154 | |
traded | Bruce E. Kiddoo Director | Sale | 750 | $528.52 | $396.4K | 3,903 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 522 | $509.53 | $266.0K | 117,157 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 106 | $458.87 | $48.6K | 118,443 | |
traded | Brian Scott Davis Chief Sales & Mrktng Officer | SalePre-arranged (10b5-1) | 10,000 | $500.69 | $5.0M | 107,019 | |
traded | Irving Tan Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $411.84 | $8.2M | 605,940 | |
traded | Vidyadhara K. Gubbi Chief of Global Operations | Sale | 4,674 | $443.19 | $2.1M | 90,041 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 363 | $377.09 | $136.9K | 120,023 | |
traded | Vidyadhara K. Gubbi Chief of Global Operations | Sale | 8,518 | $255.33 | $2.2M | 99,276 | |
traded | Vidyadhara K. Gubbi Chief of Global Operations | Sale | 10,148 | $270.31 | $2.7M | 114,969 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 9,324 | $268.27 | $2.5M | 130,229 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 6,000 | $271.67 | $1.6M | 29,933 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 214 | $286.11 | $61.2K | 133,781 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 438 | $282.33 | $123.7K | 134,759 | |
traded | Brian Scott Davis Chief Sales & Mrktng Officer | SalePre-arranged (10b5-1) | 10,000 | $279.16 | $2.8M | 122,707 | |
traded | Matthew E. Massengill Director | SalePre-arranged (10b5-1) | 36,926 | $260.43 | $9.6M | 1,316 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | Sale | 6,780 | $270.49 | $1.8M | 136,538 | |
traded | Irving Tan Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $255.44 | $5.1M | 639,502 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | SalePre-arranged (10b5-1) | 447 | $229.00 | $102.4K | 143,318 | |
traded | Kimberly Alexy Director | Sale | 2,000 | $160.08 | $320.2K | 1,585 | |
traded | Vidyadhara K. Gubbi Chief of Global Operations | Sale | 22,820 | $163.16 | $3.7M | 131,985 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 6,000 | $162.62 | $975.7K | 35,943 | |
traded | Cynthia L. Tregillis Chief Legal Officer & Corp Sec | Sale | 2,801 | $160.57 | $449.8K | 144,596 | |
traded | Kimberly Alexy Director | Sale | 1,768 | $154.00 | $272.3K | 3,585 | |
traded | Roxanne Oulman Director | Sale | 1,800 | $154.42 | $278.0K | 3,863 | |
traded | Martin I. Cole Director | SalePre-arranged (10b5-1) | 10,000 | $161.32 | $1.6M | 40,860 | |
traded | Irving Tan Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $150.69 | $3.0M | 652,389 |
GET /stocks/filings/vX/form-4?tickers=WDC&filing_date.gte=2025-10-23&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"WDC"
],
"issuer_cik": "0000106040",
"owner_cik": "0002057088",
"accession_number": "0001266824-26-000217",
"form_type": "4",
"filing_date": "2026-10-22",
"period_of_report": "2026-10-20",
"issuer_name": "WESTERN DIGITAL CORP",
"issuer_trading_symbol": "WDC",
"owner_name": "Tregillis Cynthia L",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Legal Officer & Corp Sec",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-21",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 807,
"transaction_price_per_share": 380,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 108927.657,
"transaction_value": 306660,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F3",
"description": "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."
}
]
},
{
"tickers": [
"WDC"
],
"issuer_cik": "0000106040",
"owner_cik": "0002057088",
"accession_number": "0001266824-26-000199",
"form_type": "4",
"filing_date": "2026-09-08",
"period_of_report": "2026-09-03",
"issuer_name": "WESTERN DIGITAL CORP",
"issuer_trading_symbol": "WDC",
"owner_name": "Tregillis Cynthia L",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Legal Officer & Corp Sec",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-04",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 432,
"transaction_price_per_share": 451.2,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 111030,
"transaction_value": 194918.4,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F3",
"description": "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."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 192 records
- Option exercises88 records
- Tax withholding82 records
- Grants and awards16 records
- Gifts4 records
- Other2 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for WDC every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.