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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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2020Scion Asset ManagementSell-100,000150,000$8,309
Q4 2020Renaissance Technologies LLCSell-18,200927,933$51,398
Q4 2020Thunderbird PartnersBuy1,171,8903,031,595$167,920
Q3 2020Olstein Capital ManagementBuy62,000195,000$7,127
Q3 2020Renaissance Technologies LLCSell-325,800946,133$34,581
Q3 2020Thunderbird PartnersBuy1,859,7051,859,705$67,972
Q3 2020Parnassus Endeavor FundBuy3,380,7965,484,431$200,456
Q2 2020Olstein Capital ManagementBuy33,000133,000$5,872
Q2 2020Renaissance Technologies LLCBuy1,019,3001,271,933$56,156
Q2 2020Parnassus Endeavor FundBuy1,912,0812,103,635$92,875
Q1 2020Parnassus Endeavor FundBuy191,554191,554$7,972
Q1 2020Olstein Capital ManagementSell-14,800100,000$4,162
Q1 2020Renaissance Technologies LLCBuy22,800252,633$10,515
Q4 2019Olstein Capital ManagementSell-6,300114,800$7,286
Q4 2019Renaissance Technologies LLCSell-914,016229,833$14,588
Q3 2019Miller Value PartnersSell-4,0704,300$256
Q3 2019Olstein Capital ManagementSell-67,900121,100$7,222
Q3 2019Renaissance Technologies LLCSell-1,727,0001,143,849$68,219
Q2 2019Miller Value PartnersBuy1,2758,370$398
Q2 2019Olstein Capital ManagementSell-1,000189,000$8,987
Q2 2019Scion Asset ManagementBuy100,000250,000$11,888
Q2 2019Renaissance Technologies LLCSell-12,3002,870,849$136,509
Q1 2019Miller Value PartnersBuy7,0957,095$341
Q1 2019Scion Asset ManagementBuy50,000150,000$7,209
Q1 2019Olstein Capital ManagementBuy13,000190,000$9,131
Q1 2019Renaissance Technologies LLCBuy1,734,7492,883,149$138,564
Q4 2018Scion Asset ManagementBuy100,000100,000$3,697
Q4 2018First Eagle U.S. ValueSell-848,576110,417$4,082
Q4 2018Olstein Capital ManagementBuy24,000177,000$6,544
Q4 2018Renaissance Technologies LLCBuy239,2001,148,400$42,456

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.