Company · WDC
Western Digital Corporation
Name as listed on its exchange; filed with the SEC as WESTERN DIGITAL CORP.
Nasdaq's symbol directory lists WDC on Nasdaq as “Western Digital Corporation - Common Stock”.
In the 12 months to Nov 8, 2026: insiders sold on 14 occasions ($17.1M); 11 planned-sale notices; 3 filings by holders of 5% or more; 3 congressional trade disclosures; 4 company reports (Form 8-K, since May 26, 2026).
Insider trades · SEC Form 4
Those inside the hall
Open-market purchases and sales only. Legs one person filed for one day are combined.
Who traded
- Irving Tan, Chief Executive Officer sold $8.9M
- Martin I. Cole sold $2.8M
- Stephanie A. Streeter sold $2.5M
- Cynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $2.0M
- Gubbi Vidyadhara K, Chief of Global Operations sold $825K
Every trade (14)
- SELLMartin I. Cole sold $1.6M
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $307K
- SELLGubbi Vidyadhara K, Chief of Global Operations sold $825K
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $195K
- SELLStephanie A. Streeter sold $728K
- SELLStephanie A. Streeter sold $1.8M
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $482K
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $215K
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $305K
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $112K
- SELLIrving Tan, Chief Executive Officer sold $8.9M
- SELLMartin I. Cole sold $1.1M
- SELLCynthia L. Tregillis, Chief Legal Officer & Corp Sec sold $428K
- SELLMartin I. Cole sold $101K
Planned sales · SEC Form 144
Notice given
A Form 144 is filed before an insider sells restricted stock. It states an intent; the sale, if it happens, appears later on a Form 4. Every recent notice
- Martin I Cole $1.6M
- CYNTHIA LOCK TREGILLIS $307K
- VIDYADHARA K GUBBI $825K
- CYNTHIA LOCK TREGILLIS $195K
- STREETER STEPHANIE A $4.5M
- CYNTHIA LOCK TREGILLIS $482K
- CYNTHIA LOCK TREGILLIS $215K
- CYNTHIA LOCK TREGILLIS $305K
- CYNTHIA LOCK TREGILLIS $112K
- IRVING TAN $8.9M
- CYNTHIA LOCK TREGILLIS $428K
Large holders · SEC Schedules 13D and 13G
Five percent and over
Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G
- FMR LLC 9.2%
- FMR LLC 7.2%
- VANGUARD PORTFOLIO MANAGEMENT LLC 3.6%
Congress · STOCK Act
The Althing
Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.
- Gilbert Cisneros (D-CA31): Sale $1,001 - $15,000
- Gilbert Cisneros (D-CA31): Purchase $1,001 - $15,000
- Alan Armstrong (R-OK): Purchase $1,001 - $15,000
Company reports · SEC Form 8-K
In its own words
Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.
- Results of operations and financial condition Oct 22, 2026
- Regulation FD disclosure; Other events Sep 14, 2026
- Unregistered sales of equity securities; Other events Aug 26, 2026
- Results of operations and financial condition Aug 5, 2026
Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.