BLACKROCK INC (BLK) Stock Institutional Trading Activity


BLACKROCK INC (BLK) 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 ValueAct Holdings, Renaissance Technologies LLC, Cantillon Capital Management, Cullen Value Fund, and Mairs & Power Growth Fund. 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 2025Mairs & Power Growth FundSell-141190$203,365
Q4 2025Renaissance Technologies LLCSell-20,4543,846$4,117,619
Q4 2025Cantillon Capital ManagementBuy3,850514,252$550,424,485
Q4 2025ValueAct HoldingsBuy695,000695,000$743,886,300
Q4 2025Cullen Value FundSell-2023,420$3,710,882
Q3 2025Sequoia FundBuy186186$216,852
Q3 2025Mairs & Power Growth FundSell-49331$385,903
Q3 2025Hillman Value FundSell-21342$398,728
Q3 2025Sequoia Financial AdvisorsBuy7,32640,983$47,780,943
Q3 2025Cantillon Capital ManagementSell-5,625510,402$595,062,379
Q3 2025Viking Global InvestorsBuy424,388619,492$722,247,138
Q3 2025Cullen Value FundSell-1813,622$4,204,043
Q2 2025Hillman Value FundBuy20363$380,878
Q2 2025Sequoia Financial AdvisorsBuy3,62533,657$35,314,822
Q2 2025Cantillon Capital ManagementBuy48,173516,027$541,441,330
Q2 2025Viking Global InvestorsBuy195,104195,104$204,712,872
Q2 2025Cullen Value FundSell-1153,803$3,990,748
Q1 2025Dodge & Cox Stock FundSell-95655$619,944
Q1 2025Hillman Value FundBuy12343$324,643
Q1 2025Sequoia Financial AdvisorsBuy9,94030,032$28,425,129
Q1 2025Cantillon Capital ManagementSell-15,939467,854$442,814,454
Q1 2025Cullen Value FundSell-7623,918$3,708,581
Q4 2024Hillman Value FundSell-18331$339,311
Q4 2024Sequoia Financial AdvisorsBuy2,46620,092$20,596,917
Q4 2024Cantillon Capital ManagementSell-4,906483,793$495,941,042
Q4 2024Cullen Value FundSell-854,680$4,797,892
Q3 2024Sequoia Financial AdvisorsBuy2,18317,626$16,735,693
Q3 2024Cantillon Capital ManagementSell-22,990488,699$464,024,588
Q3 2024Cullen Value FundSell-9164,765$4,524,101
Q2 2024Hillman Value FundSell-41349$274,775

Frequently asked questions about BLK activity

  • Which institutional owners are buying BLK?

    Institutional owners buying BLK 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 BLK activity?

    "Buy" means an investor increased their reported position in BLK compared to the prior reporting period. This reflects growing exposure to BLACKROCK INC (BLK) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in BLK increasing?

    Institutional interest in BLK 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.