Chase Coleman vs Bill Ackman
Chase Coleman discloses $23.98B across 46 positions as of 2026Q2; Bill Ackman (Pershing Square Capital Management) discloses $13.71B across 11 as of 2026Q1. They overlap on 5 holdings.
Tiger-cub growth against concentrated activism.
| Metric | Buffett | Bill Ackman |
|---|---|---|
| Disclosed portfolio | $23.98B | $13.71B |
| Positions | 46 | 11 |
| Top-5 concentration | 44% | 78% |
| Latest filing | 2026Q2 · Aug 14, 2026 | 2026Q1 · May 15, 2026 |
| Cloning this 13F returned | 10.7%/yr over 12.2 yrs | 10.7%/yr over 12.2 yrs |
| S&P 500, same window | 13.8%/yr | 13.8%/yr |
Clone returns replicate each manager's 13F at reported weights with the real disclosure lag; the S&P 500 figure beneath is measured over that manager's identical window (SPY total return). Because each manager has a different amount of 13F history, the two columns cover different spans — compare each manager against their own benchmark row, not across columns. Methodology.
Where they agree
Where they diverge
Buffett's largest holding that Bill Ackman doesn't own: TSM at 9.7% of the book. Bill Ackman's largest holding Buffett doesn't own: BN at 17.6%.
From SEC EDGAR Form 13F-HR filings (2026Q2 / 2026Q1). Long US-listed equities only — cash, shorts, bonds, and non-US positions are not disclosed, and both managers' real books extend beyond what a 13F shows. Not investment advice.