WESTERN DIGITAL CORP (WDC) Institutional Ownership Changes & 13F Activity

WESTERN DIGITAL CORP (WDC) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC, Parnassus Endeavor Fund, Sequoia Financial Advisors, Thunderbird Partners, and Viking Global Investors.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2021Parnassus Endeavor FundSell-203,5055,616,339$399,715
Q1 2021Thunderbird PartnersSell-944,6522,086,943$139,303
Q1 2021Parnassus Endeavor FundBuy335,4135,819,844$388,475
Q1 2021Olstein Capital ManagementSell-57,00094,000$6,275
Q4 2020Thunderbird PartnersBuy1,171,8903,031,595$167,920
Q4 2020Scion Asset ManagementSell-100,000150,000$8,309
Q4 2020Olstein Capital ManagementSell-44,000151,000$8,364
Q4 2020Renaissance Technologies LLCSell-18,200927,933$51,398
Q3 2020Parnassus Endeavor FundBuy3,380,7965,484,431$200,456
Q3 2020Thunderbird PartnersBuy1,859,7051,859,705$67,972
Q3 2020Renaissance Technologies LLCSell-325,800946,133$34,581
Q3 2020Olstein Capital ManagementBuy62,000195,000$7,127
Q2 2020Parnassus Endeavor FundBuy1,912,0812,103,635$92,875
Q2 2020Renaissance Technologies LLCBuy1,019,3001,271,933$56,156
Q2 2020Olstein Capital ManagementBuy33,000133,000$5,872
Q1 2020Parnassus Endeavor FundBuy191,554191,554$7,972
Q1 2020Renaissance Technologies LLCBuy22,800252,633$10,515
Q1 2020Olstein Capital ManagementSell-14,800100,000$4,162
Q4 2019Renaissance Technologies LLCSell-914,016229,833$14,588
Q4 2019Olstein Capital ManagementSell-6,300114,800$7,286
Q3 2019Renaissance Technologies LLCSell-1,727,0001,143,849$68,219
Q3 2019Olstein Capital ManagementSell-67,900121,100$7,222
Q3 2019Miller Value PartnersSell-4,0704,300$256
Q2 2019Scion Asset ManagementBuy100,000250,000$11,888
Q2 2019Renaissance Technologies LLCSell-12,3002,870,849$136,509
Q2 2019Miller Value PartnersBuy1,2758,370$398
Q2 2019Olstein Capital ManagementSell-1,000189,000$8,987
Q1 2019Renaissance Technologies LLCBuy1,734,7492,883,149$138,564
Q1 2019Scion Asset ManagementBuy50,000150,000$7,209
Q1 2019Olstein Capital ManagementBuy13,000190,000$9,131

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.

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