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 2015Torray FundSell-3,850124,178$42,285
Q3 2015Torray FundBuy2,366128,028$38,084
Q3 2015Renaissance Technologies LLCBuy58,500177,600$52,831
Q2 2015Torray FundBuy62,365125,662$43,477
Q2 2015Renaissance Technologies LLCBuy39,400119,100$41,206
Q1 2015Torray FundBuy69763,297$23,157
Q1 2015Renaissance Technologies LLCBuy50,00079,700$29,157
Q4 2014Torray FundBuy4,71862,600$22,383
Q4 2014Renaissance Technologies LLCBuy9,70029,700$10,620
Q3 2014Torray FundBuy57,88257,882$19,004
Q3 2014Renaissance Technologies LLCBuy17,10020,000$6,566
Q1 2014Renaissance Technologies LLCSell-50,0742,900$912
Q4 2013Renaissance Technologies LLCBuy52,97452,974$16,765
Q2 2013Miller Value PartnersBuy1,5001,500$386

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.