BLK
Blackrock Inc
7 super-investors hold BLK worth a combined $1.90B. The largest position: Jeffrey Ubben et al at 9.2% of their portfolio. This quarter the cohort logged 0 buys and 1 sell on the name. Cohort Conviction Score: 26 — ranked #523 of 724 scored stocks.
Why super-investors own BLK
Jeffrey Ubben dominates the cohort's $1.9B combined stake, with BLK representing 9.2% of his portfolio — by far the highest conviction read in the group. Despite that concentration, Ubben trimmed his $525M position in 2026Q1, the only activity across all seven holders this quarter. William Von Mueffling ($436M, 2.9%) and Thomas Gayner ($212M, 1.8%) round out the meaningful exposures, while Joel Greenblatt holds $676M at just 0.5% concentration, reflecting his highly diversified approach. Owner count has been essentially flat for six quarters, edging from one to two before stabilizing at seven — suggesting interest is neither building nor eroding materially, though Ubben's trim is a modest signal worth noting.
AI-synthesized from 13F filings. Not investment advice.
Cohort owners over time
2024Q4 → 2026Q1How many of the cohort members held this stock each quarter.
Owners (7) · click any column to sort
| #↑ | Manager | % Port. | History | Value | Shares |
|---|---|---|---|---|---|
| 1 | Joel Greenblatt | 0.5% | 6q | $676M | 703,107 |
| 2 | Jeffrey Ubben et al | 9.2% | 2q | $525M | 546,100 |
| 3 | William Von Mueffling | 2.9% | 6q | $436M | 453,282 |
| 4 | Thomas Gayner | 1.8% | 6q | $212M | 220,200 |
| 5 | Bill Nygren | 0.1% | 6q | $52M | 54,555 |
| 6 | Dodge & Cox Funds | 0.0% | 6q | $684K | 711 |
| 7 | Hillman Capital Management | 0.2% | 6q | $334K | 347 |
- 1Joel Greenblattport0.5%val$676M703,107 sh·6q held
- 2Jeffrey Ubben et alport9.2%val$525M546,100 sh·2q held
- 3William Von Muefflingport2.9%val$436M453,282 sh·6q held
- 4Thomas Gaynerport1.8%val$212M220,200 sh·6q held
- 5Bill Nygrenport0.1%val$52M54,555 sh·6q held
- 6Dodge & Cox Fundsport0.0%val$684K711 sh·6q held
- 7Hillman Capital Managementport0.2%val$334K347 sh·6q held
Owners of BLK also hold
Recent activity (1)
| Manager | Move | % Port. | Δ Shares | Value | Filed |
|---|---|---|---|---|---|
| Jeffrey Ubben et al | TRIM | 9.2% | -21% | $525M | May 15, 2026 |
Long US equity 13F-HR filings only. CUSIP 09290D101. Not investment advice.