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
Q1 2023Thunderbird PartnersSell-298,4371,188,480$44,770,042
Q1 2023Parnassus Endeavor FundSell-75,2974,515,231$170,088,752
Q4 2022Thunderbird PartnersSell-208,6671,486,917$46,912,231
Q4 2022Renaissance Technologies LLCSell-9,600104,482$3,296
Q4 2022Parnassus Endeavor FundBuy681,1044,590,528$144,831,158
Q3 2022Renaissance Technologies LLCSell-1,336,951114,082$3,713
Q3 2022Thunderbird PartnersSell-26,6141,695,584$55,191
Q3 2022Parnassus Endeavor FundSell-530,1983,909,424$127,252
Q3 2022Viking Global InvestorsBuy5,434,3707,400,746$240,894
Q2 2022Olstein Capital ManagementSell-8,000105,000$4,707
Q2 2022Thunderbird PartnersSell-132,4911,722,198$77,206
Q2 2022Viking Global InvestorsBuy655,3471,966,376$88,153
Q2 2022Parnassus Endeavor FundSell-688,4824,439,622$199,028
Q1 2022Olstein Capital ManagementBuy4,000113,000$5,610
Q1 2022Third PointBuy146,468146,468$7,272
Q1 2022Renaissance Technologies LLCBuy1,185,1001,451,033$72,044
Q1 2022Thunderbird PartnersSell-208,7241,854,689$92,085
Q1 2022Parnassus Endeavor FundSell-42,6165,128,104$254,610
Q4 2021Parnassus Endeavor FundSell-445,6195,170,720$337,183
Q4 2021Olstein Capital ManagementBuy15,000109,000$7,108
Q4 2021Renaissance Technologies LLCSell-662,000265,933$17,341
Q4 2021Viking Global InvestorsSell-1,691,6911,311,029$85,492
Q4 2021Thunderbird PartnersBuy289,1032,063,413$134,555
Q3 2021Thunderbird PartnersSell-33,3091,774,310$100,142
Q2 2021Parnassus Endeavor FundSell-203,5055,616,339$399,715
Q2 2021Thunderbird PartnersSell-279,3241,807,619$128,648
Q1 2021Parnassus Endeavor FundBuy335,4135,819,844$388,475
Q1 2021Olstein Capital ManagementSell-57,00094,000$6,275
Q1 2021Thunderbird PartnersSell-944,6522,086,943$139,303
Q4 2020Olstein Capital ManagementSell-44,000151,000$8,364

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.