Bill Ackman: The Next Warren Buffett?

4 min readMay 23, 2024


William Albert Ackman, known as Bill Ackman, is a distinguished figure in the competitive world of hedge fund management, renowned for his audacious financial moves and bold public presence. As the founder and CEO of Pershing Square Capital Management, Ackman’s career is marked by high-profile trades and substantial market influence. This in-depth article explores Ackman’s strategic financial maneuvers, delving into his most profitable trades, his approach to investments, and the broader implications of his career moves.

Early Life and Education

Born on May 11, 1966, in New York City, Bill Ackman was raised in a family deeply entrenched in the real estate industry through the Ackman-Ziff Real Estate Group, headed by his father. His upbringing in a business-oriented environment sparked his interest in finance. Ackman pursued his higher education at Harvard College, earning a Bachelor of Arts degree in history, graduating magna cum laude. His academic journey continued at Harvard Business School, where he earned an MBA, further cementing his foundation in finance.

Career Beginnings

Ackman’s professional journey began with the establishment of Gotham Partners, a venture founded alongside his Harvard peer, David P. Berkowitz. Initially focusing on modest real estate investments, the firm gradually ventured into riskier and more diversified investments. Although Gotham achieved notable early successes, it eventually faced liquidity issues that necessitated its closure.

Formation of Pershing Square Capital Management

In 2004, Ackman launched Pershing Square Capital Management, marking a new phase in his career. This venture was characterized by a more focused investment strategy, primarily revolving around value investing and occasionally controversial market plays.

Notable Investments


Early in his career at Pershing Square, Ackman placed a significant bet against bond insurer MBIA, which he believed underestimated the risks associated with mortgage debt. His position was vindicated during the financial crisis of 2008, which saw MBIA facing substantial financial difficulties, thereby generating substantial profits for Ackman’s fund.

2. Target Corporation

Ackman invested heavily in Target, advocating for strategic changes including the proposal to spin off its real estate assets into a separate REIT. Although his initiatives were not fully adopted, the publicity surrounding his involvement and the subsequent recovery in Target’s stock value benefited his positions.

3. Herbalife

One of Ackman’s most public and contentious positions was his billion-dollar short bet against nutritional supplement company Herbalife, which he labeled as a pyramid scheme. This drew public disputes with other hedge fund managers, notably Carl Icahn, and despite his persistent efforts, the position ultimately culminated in losses for Pershing Square.

4. Chipotle Mexican Grill

In 2016, Ackman took a major stake in Chipotle Mexican Grill following a significant drop in its stock due to food safety concerns. His influence helped stabilize and eventually reverse the company’s fortunes, significantly improving its market performance and profitability.

5. Canadian Pacific Railway

In 2011, Ackman took a significant position in Canadian Pacific Railway, viewing it as an underperforming asset with potential for operational improvements. He initiated one of his classic activist campaigns by successfully installing a new CEO, Hunter Harrison, a veteran railroad turnaround expert. The operational improvements implemented under this new leadership resulted in a dramatic increase in the company’s profitability and stock price, representing one of Pershing Square’s most successful investments.

6. Valeant Pharmaceuticals

Another notable but controversial investment was in Valeant Pharmaceuticals. Ackman partnered with Valeant in an attempt to buy out Botox maker Allergan, a move that eventually failed. Valeant itself faced critical scrutiny for its business practices, particularly around price hikes and accounting irregularities. Pershing Square’s substantial investment in Valeant turned sour as the pharmaceutical company’s stock plummeted, leading to significant losses for Ackman’s fund.

Investment Philosophy and Strategy

Ackman is renowned for his activist investment approach, typically characterized by acquiring significant stakes in companies and actively pushing for changes to enhance shareholder value. His strategy involves meticulous research and often a willingness to engage in public debates to defend his investment choices.

Ackman’s Approach

Ackman’s psychological approach to investing is characterized by his high conviction in his investment theses, willingness to take large positions based on deep fundamental analysis, and readiness to engage in public discourse to influence corporate governance and strategy. His aggressive tactics and public persona have both been critical in shaping his career outcomes, contributing to both his successes and his setbacks.

Challenges and Controversies

Throughout his career, Ackman has not shied away from controversy. His public disagreements, such as the prolonged battle with Carl Icahn over Herbalife, and his outspoken nature have made him a polarizing figure in the financial community.

Personal Life and Philanthropy

Outside the financial arena, Ackman is committed to philanthropy, having pledged to donate half of his wealth to charitable causes. He is married to Neri Oxman, a professor at the MIT Media Lab, reflecting his deep interest in supporting education and the arts.

Legacy and Future Prospects

Ackman continues to be a formidable presence in the investment world. His decisions and strategies are closely monitored by both critics and admirers, providing valuable insights into effective investment strategies and market dynamics.


Bill Ackman’s career offers a comprehensive study of a hedge fund manager operating at the peak of financial markets. His experiences — both successes and setbacks — provide critical lessons on risk, resilience, and the importance of maintaining strong convictions in one’s investment strategies.