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Bill Ackman

Bill Ackman

Founder & CEO — Pershing Square Capital Management
Activist Investor Long/Short Equity Concentrated Portfolio Value Investing
AUM (13F)
$15.53B
Positions
11
Latest Filing
Feb 17, 2026
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Fund Founded
2004
Style
Activist
Typical Positions
8–15
Net Worth
$9B+
Biography

Bill Ackman founded Pershing Square Capital Management in 2004 after his first fund, Gotham Partners, wound down following a series of high-profile but ultimately unsuccessful activist campaigns. Born in 1966 and raised in Chappaqua, New York, Ackman graduated from Harvard College magna cum laude in 1988 and earned his MBA from Harvard Business School in 1992. He is known as one of the most vocal and media-savvy investors in the world, regularly publishing detailed investment theses and engaging publicly in debates about his positions.

Pershing Square operates with an unusually concentrated portfolio — typically holding fewer than 15 positions — and takes large, often controlling stakes in publicly traded companies with the goal of influencing management or strategy. The fund has delivered exceptional long-term returns, including the legendary COVID hedge in early 2020 that turned a $27M premium into $2.6B in profit over a matter of weeks. Ackman launched Pershing Square USA (PSUS) in 2024 as a closed-end fund, giving retail investors direct access to his strategy.

Investment Philosophy

We look for simple, predictable, free-cash-flow-generative businesses with dominant market positions, where we can invest at a discount to intrinsic value and where we can be an active catalyst for change.

— Bill Ackman, Pershing Square Capital Management
Notable Trades
WIN
COVID Hedge (2020)
Turned a $27M credit default swap position into $2.6B in roughly three weeks as markets collapsed. One of the greatest single trades in hedge fund history.
WIN
General Growth Properties (2009)
Bought a significant stake in GGP while it was in bankruptcy. The company emerged and Pershing made over $1.6B on the trade.
LOSS
Herbalife Short (2012–2018)
A very public $1B short bet that Herbalife was a pyramid scheme. The position ultimately cost Pershing around $1B after Herbalife survived.
LOSS
Valeant Pharmaceuticals (2015–2017)
A concentrated long position that turned catastrophic after accounting irregularities and drug pricing controversies. Losses of roughly $4B.
CURRENT
Brookfield Corp (BN)
One of Pershing's largest current positions. Ackman has spoken positively about Brookfield's long-term compounding potential.
CURRENT
Alphabet / Nike
Pershing initiated positions in both Google parent Alphabet and Nike in 2023, viewing them as dominant franchises trading below intrinsic value.
Top Holdings — Pershing Square Capital Management
Top 5 Holdings · Q4 2025 Filed Feb 17, 2026
1
BROOKFIELD CORP
18.1%
2
UBER TECHNOLOGIES INC
15.9%
3
AMAZON COM INC
14.3%
4
ALPHABET INC
12.5%
5
META PLATFORMS INC
11.4%