9 hedge funds and family offices disclose a CB position in their latest SEC 13F filing — combined $12.02B in market value. Of those, 2 are classified as value investors.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Warren Buffett | Berkshire Hathaway Inc | 34,249,183 | $11.16B | 4.24% | 2026-03-31 |
| 2 | Viking Global | Viking Global Investors LP | 1,295,011 | $422.1M | 1.18% | 2026-03-31 |
| 3 | Christopher Davis | Davis Selected Advisers, LP | 1,195,391 | $389.6M | 1.79% | 2026-03-31 |
| 4 | David Rolfe | Wedgewood Partners Inc | 56,526 | $17.6M | 3.29% | 2025-12-31 |
| 5 | Ray Dalio | Bridgewater Associates LP | 44,783 | $14.6M | 0.07% | 2026-03-31 |
| 6 | George Soros | Soros Fund Management LLC | 22,890 | $7.5M | 0.10% | 2026-03-31 |
| 7 | Mairs & Power | Mairs & Power Inc | 2,334 | $728K | 0.01% | 2025-12-31 |
| 8 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 210 | $66K | 0.01% | 2025-12-31 |
| 9 | Olstein Capital Management | Olstein Capital Management LP | 19,000 | $6K | 1.22% | 2025-12-31 |
As of the latest 13F window, 9 tracked superinvestors hold CB. The largest disclosed position is Warren Buffett at $11.16B (4.2% 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 CB, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
9 hedge funds and family offices disclose a CB position in their latest SEC 13F filing — combined $12.02B in market value. Of those, 2 are classified as value investors.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Warren Buffett | Berkshire Hathaway Inc | 34,249,183 | $11.16B | 4.24% | 2026-03-31 |
| 2 | Viking Global | Viking Global Investors LP | 1,295,011 | $422.1M | 1.18% | 2026-03-31 |
| 3 | Christopher Davis | Davis Selected Advisers, LP | 1,195,391 | $389.6M | 1.79% | 2026-03-31 |
| 4 | David Rolfe | Wedgewood Partners Inc | 56,526 | $17.6M | 3.29% | 2025-12-31 |
| 5 | Ray Dalio | Bridgewater Associates LP | 44,783 | $14.6M | 0.07% | 2026-03-31 |
| 6 | George Soros | Soros Fund Management LLC | 22,890 | $7.5M | 0.10% | 2026-03-31 |
| 7 | Mairs & Power | Mairs & Power Inc | 2,334 | $728K | 0.01% | 2025-12-31 |
| 8 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 210 | $66K | 0.01% | 2025-12-31 |
| 9 | Olstein Capital Management | Olstein Capital Management LP | 19,000 | $6K | 1.22% | 2025-12-31 |
As of the latest 13F window, 9 tracked superinvestors hold CB. The largest disclosed position is Warren Buffett at $11.16B (4.2% 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 CB, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
