Bill Ackman
Extreme concentration, long holding, and willingness to push management publicly. Loves predictable cash flows and pricing power.
Harvard MBA who founded Gotham Partners in 1992 and Pershing Square in 2004. Famed for activist campaigns and a $27M CDS hedge two weeks before COVID that paid out $2.6B — one of the greatest single trades ever. Also known for the brutal Herbalife short.
Pershing Square files a 13F, and Ackman posts long public theses on X — a rare case where words and trades can be cross-checked. Very concentrated (7–10 names).
His listed closed-end fund — often trades at a NAV discount
Holdings & weights
Q1 2026 · 13F (as of 31 Mar 2026)Weights are by market value, from real 13F / daily disclosure. This is a snapshot and will change — see live: Live 13F weights & activity on dataroma
A recent core holding — a compounding alternative-asset platform.
Analyze through a master's lensA high-quality tech compounder holding.
Analyze through a master's lensA public bet on its network effects and cash-flow inflection.
Analyze through a master's lensA high-quality compounder holding.
Analyze through a master's lensA long-held franchise play (parent of Burger King).
Analyze through a master's lensA classic contrarian buy near the 2022 lows.
Analyze through a master's lensThe real-estate holding he wants to turn into a "modern Berkshire."
Analyze through a master's lensAlphabet Inc. CL C −95%, Alphabet Inc. −95%.
In their own words
The most important thing is admitting when you're wrong and fixing it fast.
Where to follow them
Primary sources. Read the original — don't settle for second-hand summaries.
Run any stock you care about through the "Concentrated · Activist" lens.
Keep exploring
More people with a similar playbook
