WESTERN DIGITAL CORP (WDC) Stock Institutional Trading Activity
WESTERN DIGITAL CORP (WDC) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Parnassus Endeavor Fund, Sequoia Financial Advisors, Thunderbird Partners, and Viking Global Investors. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- WESTERN DIGITAL CORP (WDC) stock institutional ownership
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q2 2016 | Renaissance Technologies LLC | Sell | -29,009 | 140,091 | $6,621 |
| Q2 2016 | Appaloosa Management | Buy | 1,450,000 | 1,450,000 | $68,527 |
| Q1 2016 | Jensen Investment Management | Buy | 2,680 | 9,020 | $426 |
| Q4 2015 | Jensen Investment Management | Buy | 1,410 | 6,340 | $381 |
| Q3 2015 | Renaissance Technologies LLC | Sell | -41,400 | 169,100 | $13,433 |
| Q2 2015 | Renaissance Technologies LLC | Buy | 148,100 | 210,500 | $16,507 |
| Q1 2015 | Renaissance Technologies LLC | Sell | -472,800 | 62,400 | $5,679 |
| Q4 2014 | Sequoia Financial Advisors | Buy | 1,947 | 1,947 | $216 |
| Q4 2014 | Renaissance Technologies LLC | Sell | -92,400 | 535,200 | $59,247 |
| Q3 2014 | Jensen Investment Management | Sell | -500 | 4,930 | $480 |
| Q3 2014 | Hancock Classic Value | Buy | 22,625 | 105,750 | $10,292 |
| Q3 2014 | Renaissance Technologies LLC | Buy | 400,300 | 627,600 | $61,078 |
| Q2 2014 | Jensen Investment Management | Sell | -700 | 5,430 | $501 |
| Q2 2014 | Hancock Classic Value | Buy | 54,725 | 83,125 | $7,672 |
| Q2 2014 | Renaissance Technologies LLC | Sell | -35,600 | 227,300 | $20,980 |
| Q1 2014 | Jensen Investment Management | Sell | -840 | 6,130 | $563 |
| Q1 2014 | Hancock Classic Value | Buy | 28,400 | 28,400 | $2,608 |
| Q1 2014 | Renaissance Technologies LLC | Sell | -170,202 | 262,900 | $24,139 |
| Q4 2013 | Jensen Investment Management | Buy | 100 | 6,970 | $585 |
| Q4 2013 | Renaissance Technologies LLC | Buy | 15,202 | 433,102 | $36,337 |
| Q3 2013 | Jensen Investment Management | Sell | -3,169 | 6,870 | $436 |
| Q3 2013 | Renaissance Technologies LLC | Buy | 139,300 | 417,900 | $26,495 |
| Q2 2013 | Jensen Investment Management | Buy | 10,039 | 10,039 | $623 |
| Q2 2013 | Renaissance Technologies LLC | Buy | 278,600 | 278,600 | $17,298 |
Frequently asked questions about WDC activity
Which institutional owners are buying WDC?
Institutional owners buying WDC include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in WDC activity?
"Buy" means an investor increased their reported position in WDC compared to the prior reporting period. This reflects growing exposure to WESTERN DIGITAL CORP (WDC) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in WDC increasing?
Institutional interest in WDC can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.