Billionaire Profile
William Ackman
Global Rank
#384

Image: Senate Democrats | CC BY 2.0 | via Wikimedia Commons

William Ackman

CEO, Hedge funds
UNITED STATES
Real-Time Net Worth
$8.982B
Estimated based on Hedge funds stock value as of March 6, 2026
-0.25% (24h)
Age
59
Source
Hedge funds
Industry
Finance & Investments
Citizenship
UNITED STATES

Biography

William Ackman is an American billionaire hedge fund manager and the founder and CEO of Pershing Square Capital Management. Known for his activist investing approach, Ackman identifies undervalued companies and advocates for changes to increase shareholder value. His career has been marked by both significant successes and high-profile controversies, solidifying his position as a prominent figure in the financial world. Ackman's net worth is estimated at $9.3 billion, reflecting his expertise in the hedge fund industry and strategic investments.

Fact Checked
Verified by Editorial Team
Live Data
Updated 3/6/2026

Wealth Over Time

In-Depth Profile

Early Life and Education

William Albert Ackman was born on May 11, 1966, in Chappaqua, New York. He graduated from Horace Greeley High School in 1985. Ackman received a Bachelor of Arts degree magna cum laude in social studies from Harvard College in 1988 and earned a Master of Business Administration degree from Harvard Business School in 1992.

Rise to Success

Ackman began his career in real estate investment banking. In 1992, he founded Gotham Partners with David Berkowitz, focusing on investments in public companies. The firm gained attention, and within a few years, it managed significant client assets. In 2004, Ackman launched Pershing Square Capital Management, which became his primary vehicle for investments. Through Pershing Square, Ackman became known for taking significant stakes in companies and advocating for changes to boost shareholder value. His investment strategy focuses on concentrated, high-conviction bets in undervalued companies.

Key Business Strategies

Ackman's investment style is characterized by his activist approach, where he takes large positions in companies and actively engages with management to influence strategic decisions. Pershing Square's portfolio is concentrated in a few key companies, allowing Ackman to focus his resources on driving change within those businesses. Some of his notable market plays include shorting MBIA's bonds during the 2008 financial crisis and his investments in companies like Chipotle Mexican Grill, Uber, and Canadian Pacific Railway.

Philanthropy

In 2006, Ackman, and his then wife Karen, founded the Pershing Square Foundation. The foundation has committed more than $750 million in grants to over 100 organizations focusing on economic development, education, healthcare, human rights, and arts.

Career Milestones

1992

Founded Gotham Partners

Co-founded investment firm Gotham Partners with David Berkowitz.

2004

Founded Pershing Square Capital Management

Launched Pershing Square Capital Management, an investment management company.

2009

Profit from MBIA Short

Earned $1.4 billion by shorting MBIA during the 2008 financial crisis.

2020

COVID-19 Response

Earned $2.6 billion by shorting the bond market ahead of the COVID-19 pandemic.

Philanthropy & Social Impact

Philanthropy

Pershing Square Foundation

$750M+

Founded by Ackman and his ex-wife Karen, it funds organizations in economic development, education, healthcare, human rights, and the arts.

Philanthropy

Coupang Donation

$1.36B

Donated 26.5 million shares of Coupang to three entities including his foundation

Business Philosophy & Leadership

Notable Quotes

"“This is the highest conviction I've ever had about any investment I've ever made.”"

"The whole situation is a tragedy."

Leadership Principles

Activist Investing

Taking significant stakes in companies to advocate for change and increase shareholder value.

Concentrated Portfolio

Focusing on a limited number of high-conviction investments.

Controversies & Challenges

2012

Herbalife Short

Waged a high-profile, and ultimately unsuccessful, campaign against Herbalife, arguing it was a pyramid scheme.

2024

Harvard Criticism

Criticized Harvard University's handling of antisemitism and DEI initiatives, leading to accusations of racism.