Billionaire Profile
William Ackman
Global Rank
#345

Image: Public domain | via Wikimedia Commons

William Ackman

CEO, Pershing Square Capital Management
US
Real-Time Net Worth
$9.4B
As of December 2025
Age
59
Source
Hedge funds
Industry
finance-investments
Citizenship
US

Biography

William Ackman is an American billionaire hedge fund manager and the founder and CEO of Pershing Square Capital Management. Born on May 11, 1966, Ackman has built his wealth through hedge funds, specializing in activist investments and taking significant stakes in companies to advocate for changes. His career, marked by both successes and controversies, has solidified his position as a prominent figure in finance. As of July 2025, his net worth is estimated at $9.4 billion. Ackman is also known for his philanthropic efforts through The Giving Pledge.

Wealth Over Time

In-Depth Profile

Early Life and Education

William Albert Ackman was born in Chappaqua, New York, on May 11, 1966. He is of Ashkenazi Jewish descent. His father, Lawrence David Ackman, was the former chairman of Ackman-Ziff Real Estate Group. Ackman graduated from Horace Greeley High School in 1985. He received a Bachelor of Arts degree magna cum laude in social studies from Harvard College in 1988. In 1992, he earned a Master of Business Administration degree from Harvard Business School.

Rise to Success

Ackman co-founded Gotham Partners in 1992, and later, in 2004, he founded Pershing Square Capital Management. The hedge fund is based in New York City and specializes in activist investments. Pershing Square focuses on a concentrated portfolio of high-quality, large-capitalization North American companies. Ackman's investment strategy often involves taking significant positions in companies and advocating for changes to increase shareholder value. Pershing Square Holdings (PSH) was established in 2012 and is a Guernsey-domiciled, closed-ended investment holding company that tracks the performance of Pershing Square Capital Management. PSH's investment objective is to maximize its long-term compound annual rate of growth.

Key Business Strategies

Pershing Square employs a focused approach, concentrating investments in a small number of high-conviction positions. The fund is known for its activist investment style, which involves pushing for changes in management, operations, or governance to unlock value. Some of Ackman's notable investments include Chipotle, Uber, and Amazon. The firm's portfolio is typically allocated to 8-12 core holdings, primarily liquid, listed large-cap North American companies, with a focus on high-quality businesses with predictable cash flow.

Philanthropy

Ackman is a signatory of The Giving Pledge, committing to donate at least half of his wealth to charitable causes. In 2006, Ackman and his then-wife Karen founded the Pershing Square Foundation to fund organizations focused on economic development, education, healthcare, human rights, arts, and urban development. The foundation has committed more than $750 million in grants to over 100 organizations.

Career Milestones

1988

Graduated from Harvard College

Earned a Bachelor of Arts degree in social studies.

1992

Co-founded Gotham Partners

Co-founded the investment firm Gotham Partners.

1992

Graduated from Harvard Business School

Received a Master of Business Administration degree.

2004

Founded Pershing Square Capital Management

Established Pershing Square Capital Management, a hedge fund.

2012

Pershing Square Holdings established

Pershing Square Holdings, a closed-ended investment fund, was established.

2024

Stepped down from the board of Howard Hughes Holdings

Stepped down as chairman of Howard Hughes Holdings.

Philanthropy & Social Impact

Various

Pershing Square Foundation

$750M

Funds organizations focused on economic development, education, healthcare, and more.

Criminal Justice

Innocence Project

$1M+

Donations to the Innocence Project in New York and Centurion Ministries to support investigations of wrongful convictions.

Cancer Research

The Pershing Square Sohn Cancer Research Alliance

$49M+

Committed to supporting innovative cancer research.

Business Philosophy & Leadership

Notable Quotes

""How did Bill Ackman get rich?""

Leadership Principles

Activist Investing

Taking significant stakes in companies and advocating for change.

High-Conviction Investments

Focusing on a small number of high-potential investments.

Long-Term Value Creation

Aiming to maximize long-term growth in intrinsic value per share.

Controversies & Challenges

2012

Herbalife Short

Ackman took a short position against Herbalife, alleging it was a pyramid scheme, leading to a long-running public debate.

2023

Criticism of Harvard University

Ackman criticized Harvard University's handling of student protests and alleged plagiarism, which led to the resignation of the president.