What Happened to William Albert Ackman?
Bill Ackman is a prominent American billionaire hedge fund manager and activist investor, best known as the founder and CEO of Pershing Square Capital Management. He has a history of high-profile, concentrated investments and public campaigns, and in recent years, has become increasingly vocal on political and social issues, particularly regarding antisemitism on university campuses. As of May 2026, Ackman continues to manage Pershing Square, which has recently made significant portfolio shifts, including a new stake in Microsoft and an unsolicited bid for Universal Music Group.
Quick Answer
Bill Ackman, the founder of Pershing Square Capital Management, remains a highly active and influential figure in finance and public discourse as of May 2026. His firm recently disclosed a new, substantial stake in Microsoft in Q1 2026, while significantly reducing its Alphabet holdings and exiting Hilton Worldwide. Pershing Square also made an unsolicited $64 billion offer to acquire Universal Music Group in April 2026 and launched a new closed-end fund, Pershing Square USA, in April 2026. Beyond investing, Ackman has been a vocal critic of antisemitism on university campuses, notably leading a campaign against Harvard's former president, and endorsed Donald Trump in the 2024 presidential election.
📊Key Facts
📅Complete Timeline13 events
Born in Chappaqua, New York
William Albert Ackman was born in Chappaqua, New York.
Founds Pershing Square Capital Management
After co-founding Gotham Partners in the early 1990s, Ackman established Pershing Square Capital Management, his current hedge fund, using over $50 million of his own money.
Invests in Chipotle Mexican Grill
Ackman began investing in Chipotle Mexican Grill, which became one of Pershing Square's top holdings and where he influenced the hiring of a new CEO.
Launches Pershing Square Tontine Holdings (PSTH) SPAC
Ackman took his blank check company, Pershing Square Tontine Holdings, public with a $4 billion IPO, making it the largest SPAC at the time.
Acquires 10% stake in Universal Music Group
Pershing Square acquired a 10% stake in Universal Music Group, which became one of its largest positions.
Becomes vocal critic of Harvard's response to antisemitism
Following the October 7 attacks, Ackman publicly criticized Harvard University's administration and president for their perceived insufficient response to antisemitism on campus.
Campaigns against Harvard President Claudine Gay and defends wife Neri Oxman
Ackman's campaign contributed to the resignation of Harvard President Claudine Gay over plagiarism allegations. Simultaneously, his wife, Neri Oxman, faced similar allegations, which Ackman publicly defended against.
Rejoins Howard Hughes Holdings board
Ackman rejoined the board of Howard Hughes Holdings as Executive Chairman after Pershing Square increased its investment in the company.
Exits Chipotle and Nike, invests in Meta Platforms
Pershing Square fully exited its long-held stake in Chipotle Mexican Grill and sold its remaining options in Nike, while initiating a new position in Meta Platforms.
Makes $64 billion unsolicited bid for Universal Music Group
Pershing Square Capital Management submitted a non-binding proposal to acquire all outstanding shares of Universal Music Group for approximately $64 billion, proposing a merger with Pershing Square SPARC Holdings and a NYSE listing.
Publicly addresses family office drama
Amid IPO roadshows, Ackman used X (formerly Twitter) to publicly discuss a personal drama involving his family office, Table, and an employee's severance demands.
Launches Pershing Square USA (PSUS) IPO
Pershing Square launched the IPO for its new closed-end fund, Pershing Square USA (PSUS), on the New York Stock Exchange.
Discloses new $2.09 billion stake in Microsoft
Pershing Square's Q1 2026 13F filing revealed a new, significant position in Microsoft, valued at approximately $2.09 billion, making it a core holding. This was accompanied by exits from Hilton Worldwide and a reduction in Alphabet.
🔍Deep Dive Analysis
William Albert Ackman, born in 1966, is an American billionaire hedge fund manager renowned for his activist investing approach through Pershing Square Capital Management, which he founded in 2004. His career has been marked by both highly successful, often contentious, campaigns and significant losses. Early successes included his involvement with General Growth Properties, which yielded substantial returns.
Ackman's investment strategy typically involves taking concentrated positions in a few publicly traded companies, advocating for operational or strategic changes to unlock value. This approach was evident in his long-term investment in Chipotle Mexican Grill, which began in 2016 and saw him credited with helping the company rebound by influencing the hiring of a new CEO in 2018. However, Pershing Square began reducing its Chipotle stake in 2025 and fully exited the position by early 2026, citing declining transactions and flat comparable sales growth guidance. Similarly, a short position against Herbalife in the 2010s resulted in a multi-billion dollar loss, while an investment in Valeant Pharmaceuticals also proved to be a damaging setback.
In recent years, Ackman has expanded his public profile beyond finance, becoming a prominent voice on social and political issues. Following the October 7, 2023, attacks, he became a vocal critic of antisemitism on university campuses, particularly at his alma mater, Harvard University. He publicly campaigned for the removal of Harvard's then-president, Claudine Gay, who subsequently resigned in January 2024 amidst plagiarism allegations, which Ackman amplified. This period also saw plagiarism allegations surface against his wife, Neri Oxman, which Ackman vehemently defended against, even pledging to review all MIT faculty for similar issues. Politically, Ackman, a long-time donor to Democratic candidates, endorsed Donald Trump in the 2024 United States presidential election.
As of 2026, Pershing Square Capital Management continues to be highly active. In April 2026, Ackman's firm made an unsolicited cash-and-stock offer valued at approximately $64 billion to acquire Universal Music Group (UMG), proposing to merge it with Pershing Square SPARC Holdings and move its listing to the New York Stock Exchange. This follows Pershing Square's initial acquisition of a 10% stake in UMG in 2021. The firm also launched a new closed-end fund, Pershing Square USA (PSUS), which debuted on the NYSE in April 2026. In a significant portfolio shift disclosed in May 2026, Pershing Square established a new stake in Microsoft, valued at approximately $2.09 billion at the end of Q1 2026, making it one of the fund's top holdings. This move was funded by a substantial reduction in its Alphabet stake and a complete exit from Hilton Worldwide Holdings. Ackman's net worth was estimated at $8 billion by Bloomberg as of April 2026.
What If...?
Explore alternate histories. What if William Albert Ackman made different choices?