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
Q2 2024Sequoia Financial AdvisorsBuy1,82715,443$12,158,462
Q2 2024Renaissance Technologies LLCSell-71,60024,300$19,131,876
Q2 2024Cantillon Capital ManagementBuy32,772511,689$402,862,983
Q2 2024Cullen Value FundSell-3915,681$4,472,440
Q1 2024Renaissance Technologies LLCBuy55,20095,900$79,952
Q1 2024Hillman Value FundSell-17390$325,143
Q1 2024Sequoia Financial AdvisorsSell-3,59413,616$11,352,072
Q1 2024Cantillon Capital ManagementSell-10,207478,917$399,273,103
Q1 2024Cullen Value FundSell-4516,072$4,957,973
Q4 2023Renaissance Technologies LLCBuy27,90040,700$33,040
Q4 2023Sequoia Financial AdvisorsBuy15,19617,210$13,971,533
Q4 2023Cantillon Capital ManagementSell-12,577489,124$397,070,863
Q4 2023Cullen Value FundBuy6,5236,523$5,295,229
Q3 2023Hillman Value FundSell-345407$263,121
Q3 2023Sequoia Financial AdvisorsSell-1212,014$1,301,756
Q3 2023Cantillon Capital ManagementBuy2,325501,701$324,344,680
Q2 2023Renaissance Technologies LLCSell-97,60012,800$8,847
Q2 2023Mairs & Power Growth FundBuy380380$262,633
Q2 2023Hillman Value FundSell-28752$519,737
Q2 2023Sequoia Financial AdvisorsBuy5642,135$1,475,675
Q2 2023Cantillon Capital ManagementBuy67,000499,376$345,138,729
Q1 2023Meritage GroupBuy347347$232
Q1 2023Renaissance Technologies LLCBuy26,400110,400$73,871
Q1 2023Hillman Value FundSell-36780$521,914
Q1 2023Sequoia Financial AdvisorsBuy351,571$1,051,246
Q1 2023Cantillon Capital ManagementSell-5,272432,376$289,311,429
Q4 2022Hillman Value FundSell-86816$578,242
Q4 2022Sequoia Financial AdvisorsBuy5141,536$1,088,485
Q4 2022Cantillon Capital ManagementBuy11,959437,648$310,130,502
Q3 2022Hillman Value FundBuy72902$496

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.