4 hedge funds and family offices disclose a BLK position in their latest SEC 13F filing — combined $212.4M in market value. Of those, 1 are classified as value investors.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Tom Gayner | Markel Group Inc. | 220,200 | $211.7M | 1.61% | 2026-06-30 |
| 2 | Mark Hillman | Hillman Capital Management Inc | 333 | $356K | 0.22% | 2025-12-31 |
| 3 | Mairs & Power | Mairs & Power Inc | 190 | $203K | 0.00% | 2025-12-31 |
| 4 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 56 | $60K | 0.01% | 2025-12-31 |
As of the latest 13F window, 4 tracked superinvestors hold BLK. The largest disclosed position is Tom Gayner at $211.7M (1.6% of portfolio).
13F filings are due 45 days after each quarter end and capture long-equity positions held by U.S. institutional managers with $100M+ AUM. Use this page to see exactly who is buying BLK, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
4 hedge funds and family offices disclose a BLK position in their latest SEC 13F filing — combined $212.4M in market value. Of those, 1 are classified as value investors.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Tom Gayner | Markel Group Inc. | 220,200 | $211.7M | 1.61% | 2026-06-30 |
| 2 | Mark Hillman | Hillman Capital Management Inc | 333 | $356K | 0.22% | 2025-12-31 |
| 3 | Mairs & Power | Mairs & Power Inc | 190 | $203K | 0.00% | 2025-12-31 |
| 4 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 56 | $60K | 0.01% | 2025-12-31 |
As of the latest 13F window, 4 tracked superinvestors hold BLK. The largest disclosed position is Tom Gayner at $211.7M (1.6% of portfolio).
13F filings are due 45 days after each quarter end and capture long-equity positions held by U.S. institutional managers with $100M+ AUM. Use this page to see exactly who is buying BLK, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
