Bill Ackman
Pershing Square · SEC CIK 1336528
Concentrated, activist quality compounders.
This filing is 158 days old. Pershing Square keeps roughly 95% of its positions in a typical quarter, so about 91% of this book is likely still intact today.
How half-life is computedSnapshot half-life is the number of days after the period end at which half of this specific fund's reported book is expected to have changed, measured from its own past filings. It is a decay estimate, not knowledge of current positions.
Largest holdings, as filed
Top 10 of 11 positions. Weights are against the whole filed book. 13F filings cover US-listed holdings only.
| Company | Ticker | Value | % of book | Freshness |
|---|---|---|---|---|
| BROOKFIELD CORP | BN | $2.42B | 17.6% | |
| AMAZON COM INC | AMZN | $2.39B | 17.4% | |
| UBER TECHNOLOGIES INC | UBER | $2.15B | 15.7% | |
| MICROSOFT CORP | MSFT | $2.09B | 15.3% | |
| RESTAURANT BRANDS INTL INC | QSR | $1.67B | 12.2% | |
| META PLATFORMS INC | META | $1.52B | 11.1% | |
| HOWARD HUGHES HOLDINGS INC | HHH | $1.19B | 8.7% | |
| SEAPORT ENTMT GROUP INC | SEG | $107.91M | 0.8% | |
| ALPHABET INC | GOOG | $89.42M | 0.7% | |
| HERTZ GLOBAL HLDGS INC | HTZ | $70.26M | 0.5% |
Freshness: how likely each position is still held today, from this fund's own turnover history, each position's tenure and the filing's age. Hover a bar for the numbers. Method.
What changed last quarter
Between Q4 2025 and Q1 2026, the largest add was AMZN (shares up 19%), now $2.39B; the largest trim was BN (shares down 3%); HLT no longer appears among the previous quarter's largest positions. All of it computed from the two filings, nothing inferred.
Exited since Q4 2025
- HLTwas $869.98M
Exit scan covers the previous quarter's 40 largest positions, a stated bound, because reading a mega fund's entire book per page render is not honest engineering.
Common questions
What are Bill Ackman's biggest holdings?
As of the Q1 2026 13F, the largest reported positions at Pershing Square are BN (17.6% of the book), AMZN (17.4% of the book), UBER (15.7% of the book).
How big is Pershing Square's portfolio?
The latest 13F reports $13.71B across 11 US-listed positions. 13F filings cover US-listed holdings only, so non-US positions and shorts are not included.
Does Bill Ackman still hold these positions?
Unknown for certain: a 13F may be filed up to 45 days after quarter end. Based on Pershing Square's own filing history, the fund keeps roughly 95% of positions in a typical quarter, so at 158 days since the period end roughly 91% of this book is likely intact. The snapshot half-life for this fund is about 1125 days.
What did Bill Ackman buy and sell last quarter?
Between Q4 2025 and Q1 2026, the largest add was AMZN (shares up 19%), now $2.39B; the largest trim was BN (shares down 3%); HLT no longer appears among the previous quarter's largest positions. All of it computed from the two filings, nothing inferred.
Funds with overlapping books
Inside the app: the full book for Pershing Square, quarter on quarter buys and sells, consensus across 140+ funds and copy-to-watchlist.
Source: SEC EDGAR 13F filings. Values are as filed and cover US-listed positions only. A 13F may be filed up to 45 days after the quarter ends, so positions can change before the filing is even public; the freshness figures above quantify that lag instead of hiding it. Educational information, not financial advice.