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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- BLACKROCK INC (BLK) stock institutional ownership
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2018 | Renaissance Technologies LLC | Sell | -195,800 | 23,200 | $9,113 |
| Q3 2018 | Torray Fund | Sell | -6,752 | 23,827 | $11,230 |
| Q3 2018 | Dodge & Cox Stock Fund | Buy | 150 | 750 | $353 |
| Q3 2018 | Sequoia Financial Advisors | Buy | 57 | 7,616 | $3,590 |
| Q3 2018 | Renaissance Technologies LLC | Buy | 205,000 | 219,000 | $103,221 |
| Q3 2018 | Vulcan Value Partners | Buy | 433,683 | 433,683 | $204,408 |
| Q3 2018 | Eagle Capital Management | Buy | 164 | 5,926 | $2,793 |
| Q2 2018 | Torray Fund | Sell | -4,166 | 30,579 | $15,260 |
| Q2 2018 | Sequoia Financial Advisors | Buy | 7,559 | 7,559 | $3,772 |
| Q2 2018 | Third Point | Sell | -435,000 | 650,000 | $324,376 |
| Q2 2018 | Eagle Capital Management | Buy | 5,762 | 5,762 | $2,875 |
| Q1 2018 | Torray Fund | Sell | -897 | 34,745 | $18,822 |
| Q1 2018 | Renaissance Technologies LLC | Sell | -14,100 | 14,000 | $7,584 |
| Q1 2018 | Lone Pine Capital | Sell | -185,000 | 918,870 | $497,770 |
| Q1 2018 | Third Point | Sell | -465,000 | 1,085,000 | $587,766 |
| Q4 2017 | Torray Fund | Sell | -2,717 | 35,642 | $18,310 |
| Q4 2017 | Renaissance Technologies LLC | Sell | -35,617 | 28,100 | $14,435 |
| Q4 2017 | Lone Pine Capital | Buy | 1,103,870 | 1,103,870 | $567,069 |
| Q3 2017 | Torray Fund | Sell | -6,647 | 38,359 | $17,150 |
| Q3 2017 | Renaissance Technologies LLC | Sell | -136,251 | 63,717 | $28,487 |
| Q2 2017 | Torray Fund | Sell | -3,393 | 45,006 | $19,011 |
| Q2 2017 | Third Point | Buy | 1,550,000 | 1,550,000 | $654,736 |
| Q1 2017 | Torray Fund | Sell | -461 | 48,399 | $18,562 |
| Q1 2017 | Renaissance Technologies LLC | Buy | 114,854 | 199,968 | $76,690 |
| Q4 2016 | Torray Fund | Sell | -1,223 | 48,860 | $18,593 |
| Q4 2016 | Renaissance Technologies LLC | Sell | -92,486 | 85,114 | $32,389 |
| Q3 2016 | Torray Fund | Sell | -41,466 | 50,083 | $18,153 |
| Q2 2016 | Torray Fund | Sell | -80,793 | 91,549 | $31,358 |
| Q1 2016 | Torray Fund | Buy | 48,164 | 172,342 | $58,695 |
| Q1 2016 | Dodge & Cox Stock Fund | Buy | 600 | 600 | $204 |
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.