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
Q3 2022Sequoia Financial AdvisorsSell-1011,022$562
Q3 2022Cantillon Capital ManagementBuy53,808425,689$234,248
Q2 2022Hillman Value FundBuy67830$505
Q2 2022Sequoia Financial AdvisorsBuy981,123$684
Q2 2022Renaissance Technologies LLCSell-161,40084,000$51,159
Q2 2022Cantillon Capital ManagementBuy142,602371,881$226,490
Q1 2022Hillman Value FundBuy763763$583
Q1 2022Sequoia Financial AdvisorsBuy2681,025$783
Q1 2022Cantillon Capital ManagementBuy126,984229,279$175,208
Q1 2022Renaissance Technologies LLCBuy218,400245,400$187,527
Q4 2021Sequoia Financial AdvisorsBuy489757$693
Q4 2021Cantillon Capital ManagementBuy102,295102,295$93,657
Q3 2021Sequoia Financial AdvisorsSell-536268$225
Q2 2021Sequoia Financial AdvisorsBuy13804$703
Q1 2021Sequoia Financial AdvisorsSell-19791$596
Q4 2020Sequoia Financial AdvisorsBuy98810$584
Q4 2020Renaissance Technologies LLCSell-100,00027,000$19,482
Q3 2020Dodge & Cox Stock FundSell-265750$423
Q3 2020Sequoia Financial AdvisorsBuy712712$401
Q2 2020Dodge & Cox Stock FundBuy2651,015$552
Q2 2020Sequoia Financial AdvisorsSell-7740$402
Q1 2020Sequoia Financial AdvisorsBuy9774$341
Q4 2019Sequoia Financial AdvisorsBuy215765$385
Q3 2019Vulcan Value PartnersSell-220,50938$17
Q3 2019Sequoia Financial AdvisorsSell-57550$245
Q2 2019Sequoia Financial AdvisorsBuy100607$285
Q2 2019Vulcan Value PartnersBuy220,445220,547$103,503
Q1 2019Sequoia Financial AdvisorsSell-7,109507$217
Q1 2019Renaissance Technologies LLCBuy103,800127,000$54,276
Q4 2018Vulcan Value PartnersSell-433,581102$40

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.