Bill Ackman: Career, Famous Trades & Investment Style

In March 2020, with COVID-19 beginning to spread across the United States, Bill Ackman appeared on CNBC visibly distressed. “Hell is coming,” he said. He warned that the pandemic would cause catastrophic economic damage and called for a nationwide shutdown. The interview went viral.

What viewers didn’t know at the time was that Pershing Square, his hedge fund, had already spent $27 million on credit default swap protection against a market crash. By the time the interview aired, Ackman’s trade was already in place. When markets fell sharply over the following weeks and he closed the position, Pershing Square had made $2.6 billion — a return of nearly 100x on the $27 million spent on protection.

The sequence — a public warning followed by a disclosed profit — sparked intense debate about the line between market commentary and market moving. The trade itself, however, was legal and fully disclosed. It was also characteristic of how Ackman operates: high conviction, large position, public about the thesis, and willing to defend his reasoning regardless of the controversy it generates.

This article covers who Bill Ackman is, where he came from, how to find his current verified portfolio in the SEC’s official database, and what his most significant trades — wins and losses both — reveal about how he thinks.

Who is Bill Ackman?

William Albert Ackman was born on May 11, 1966, in Chappaqua, New York, into a financially literate household — his father, Lawrence D. Ackman, was chairman of a real estate mortgage firm. He is 60 years old in 2026. He attended Horace Greeley High School in Westchester County and went on to Harvard University, where he rowed for the crew team and graduated magna cum laude in 1988 with a bachelor’s degree in social studies. He then earned an MBA from Harvard Business School in 1992.

After graduation, he spent two years working at his father’s real estate company before co-founding Gotham Partners, a hedge fund, in 1992 with a Harvard classmate, David Berkowitz. Gotham grew quickly in its early years, investing in both public and private companies. By the late 1990s and early 2000s, however, the fund became entangled in illiquid investments and attracted regulatory scrutiny. The Securities and Exchange Commission investigated Ackman’s short position in bond insurer MBIA — a trade that was later proved correct in the 2008 financial crisis — but the investigation was ultimately dropped without charges. Gotham Partners closed in 2003.

In 2004, at 38, Ackman launched Pershing Square Capital Management with approximately $54 million in initial capital, sourced from his own money and an investment from Leucadia National Corporation. He was starting over, with a smaller fund, a bruised reputation, and a thesis about how to invest that he has refined and defended for the two decades since.

Pershing Square: the structure and the scale

Pershing Square Capital Management operates as an activist hedge fund — though Ackman publicly swore off traditional activism in 2022, announcing he would no longer push for board seats or management changes. What remains is a concentrated, long-only approach focused on what he describes as “simple, predictable, free-cash-flow generative businesses.”

Ackman has stated publicly that his long-term ambition is to build a scaled permanent capital vehicle — something he has described as resembling “a Berkshire Hathaway for our generation.” As part of that effort, Pershing Square Inc. was established as a public parent entity and began filing its own 13F reports with the SEC, separate from the original Pershing Square Capital Management, L.P. entity that has filed since 2004. Readers interested in the most current holdings should search for both entities on SEC EDGAR to ensure they have the complete picture.

The fund’s Pershing Square Holdings vehicle — the entity most closely tracked by outside investors — has delivered a 12% annualized return since the beginning of 2013.

Bill Ackman’s net worth: what the numbers show

Ackman does not disclose his personal net worth, and any figure you encounter — including those from Forbes and Bloomberg — is an estimate.

The most significant component of his wealth is his approximately 45% ownership stake in Pershing Square Inc., the management company. The value of that stake fluctuates with the firm’s assets under management and the performance of the fund. Various sources have estimated his total net worth in the range of $4 billion to $9 billion. Forbes, which includes him on its Billionaires list, has cited figures in this range at different points in 2025 and 2026. Bloomberg’s Billionaires Index tracks him as a billionaire but the precise figure is an estimate.

His compensation from Pershing Square’s management fees and performance fees has historically been substantial but is not separately disclosed. For the purposes of this article, Ackman is a confirmed billionaire whose precise wealth is genuinely uncertain — and any source claiming a specific, exact figure is estimating.

How to find Ackman’s current portfolio

Pershing Square Capital Management files quarterly 13F reports with the U.S. Securities and Exchange Commission, disclosing its long U.S. equity positions as of the end of each quarter. These filings are the only official, primary-source record of what the fund holds.

To see Ackman’s most current verified holdings, go directly to: SEC EDGAR — search for “Pershing Square Capital Management” at https://www.sec.gov/cgi-bin/browse-edgar

Before reading any 13F: an important caveat applies with particular force for Ackman. His fund makes extensive use of options and derivatives — his famous COVID trade was executed through credit default swaps, which do not appear in a 13F — and the filing covers only long U.S.-listed equity positions. Cash, short positions, non-U.S. holdings, and derivatives are not disclosed. The 13F is a partial picture of the fund’s actual exposure.

What is consistently documented in recent filings (based on filings confirmed through early 2026): Pershing Square maintains a concentrated portfolio of approximately 10 to 12 positions, with core long-term holdings that have included Brookfield Corporation (BN), Amazon (AMZN), Uber Technologies (UBER), Microsoft (MSFT), and Restaurant Brands International (QSR). These represent companies consistent with Ackman’s stated focus on “simple, predictable, free-cash-flow generative businesses” with durable competitive advantages.

Note: This article intentionally does not report specific allocation percentages or recent trade activity from 2026 beyond what is confirmed in the official SEC filings linked above. We encourage readers to verify current positions directly at SEC EDGAR before making any financial decisions.

The investments that defined his career

Understanding Ackman’s current portfolio requires understanding the history of how he has invested — including the trades that went wrong, which he has generally discussed publicly and with unusual candor.

General Growth Properties (2008–2010): the trade that made Pershing Square

When the mall REIT General Growth Properties filed for bankruptcy in April 2009 — at the time the largest real estate bankruptcy in U.S. history — the consensus view was that the company would be liquidated and its assets sold piecemeal. Ackman disagreed. He believed the bankruptcy was driven by temporary financing problems at the parent company level, not by fundamental problems with the underlying malls, and that the right outcome was reorganization rather than liquidation.

Pershing Square invested approximately $60 million in GGP’s distressed debt and equity. When GGP emerged from bankruptcy and the stock recovered, that investment was worth approximately $1.6 billion — a return of roughly 27 times on the initial capital. It was the trade that established Pershing Square as one of the most important hedge funds in the United States.

Herbalife short (2012–2018): the $1 billion bet that didn’t work

In December 2012, Ackman announced a $1 billion short position in Herbalife at a three-hour public presentation, arguing the nutrition company was operating as a pyramid scheme and that its stock would eventually go to zero. The announcement triggered one of the most public and prolonged fights in hedge fund history.

Carl Icahn, with whom Ackman had previously had a falling out over another investment, went publicly long on Herbalife and directly attacked Ackman’s thesis in a live CNBC phone call. Herbalife eventually settled with the Federal Trade Commission in 2016 for $200 million without admitting wrongdoing — a result that neither confirmed Ackman’s pyramid scheme thesis in full nor vindicated the company. Ackman closed the short in 2018 at a loss of approximately $1 billion.

He has discussed the failure in subsequent interviews. The trade failed for the reasons many short positions against well-funded companies fail: the company survived long enough to outlast the pressure, regulatory resolution was ambiguous, and holding a public short against an opponent as aggressive as Icahn added costs and complexity that eroded the position.

Valeant Pharmaceuticals (2015–2016): the largest single loss

Ackman built a large long position in Valeant Pharmaceuticals alongside investor ValueAct Capital, defending the company’s strategy of acquiring businesses and sharply raising drug prices. When Valeant came under scrutiny for its pricing practices and accounting irregularities, the stock collapsed from a peak of over $260 per share to below $10. Pershing Square’s loss on the position is estimated at approximately $4 billion — the largest single-trade loss in the fund’s history.

Ackman sold the position in 2017 and subsequently described his investment thesis as based on inadequate due diligence on the company’s business model and the sustainability of its accounting. He has said it was the worst investment decision of his career.

COVID pandemic hedge (2020): $2.6 billion from $27 million

The March 2020 trade described in the opening of this article remains Ackman’s most discussed single transaction. Pershing Square spent $27 million on credit protection through credit default swaps structured against investment-grade and high-yield bond indices. As credit markets seized up during the early pandemic panic and corporate bond spreads widened dramatically, the position’s value surged. Pershing Square closed it for approximately $2.6 billion — a return of nearly 100x.

Fannie Mae and Freddie Mac preferred shares (ongoing)

Ackman has held positions in the preferred shares of Fannie Mae (FNMA) and Freddie Mac (FMCC), the two government-sponsored mortgage enterprises that have been in federal conservatorship since they were seized by regulators in September 2008. His thesis is that political and regulatory developments will eventually lead to their recapitalization and exit from conservatorship, at which point the preferred shares — which have been paying no dividends under government control — would recover significant value.

The trade has required patience measured in years, not quarters. Stan Druckenmiller — whose portfolio we profile separately — has reportedly expressed agreement with this thesis at various points.

How Ackman thinks about investing

Ackman’s investment philosophy has evolved meaningfully since his early activist days, and he has documented that evolution publicly.

In his early years at Pershing Square, he was a classic activist investor: taking large positions in undervalued companies, pushing for board changes, management replacements, spinoffs, and other structural changes to unlock value. The approach produced significant returns in the General Growth Properties trade and in early Chipotle positioning, where he pushed for operational and management changes after an E. coli outbreak drove the stock down.

In 2022, he announced publicly that he was stepping back from activism. The explanation he gave was that the activist approach was too time-consuming, too adversarial, and had produced some of his most painful experiences. He wanted to invest in businesses he believed were fundamentally excellent without needing to change them.

The current portfolio reflects this evolution. Uber, Microsoft, Brookfield, Amazon, Restaurant Brands, and Meta are all large-scale, established businesses. The current portfolio — based on publicly documented filings — reflects this evolution toward established, high-quality businesses rather than turnaround situations.

He has described his selection framework as focusing on companies with durable competitive advantages, the ability to compound free cash flow, and management teams that allocate capital well. This framework is described in interviews and in Pershing Square’s investor letters; the fund does not publish a detailed methodology document.

What individual investors can take from Ackman’s career

The full ledger of Ackman’s career — GGP, Herbalife, Valeant, COVID hedge, Chipotle, Fannie/Freddie — illustrates something important that is easy to miss when examining any single trade: even investors with exceptional insight and conviction have a mixed record when examined across their full career. The COVID hedge was exceptional. The Herbalife and Valeant trades were among the worst single-position losses at a major hedge fund in recent memory.

Several principles from his career are documentable and worth noting.

Concentration requires tolerance for large temporary losses. Pershing Square’s portfolio of 14 positions means that a single bad call — Valeant being the example — has an outsized effect on overall performance. This is the trade-off that every concentrated investor accepts, and it produces outperformance in good years and underperformance in bad ones at a scale that more diversified portfolios simply don’t experience.

Being publicly right is different from being profitably right. Ackman’s analysis of Herbalife attracted serious regulatory scrutiny and ultimately resulted in a settlement. But being correct that the company’s practices warranted regulatory attention did not translate into a profitable short position, because the timing and the market dynamics worked against him. The distinction between analytical accuracy and investment success is not the same thing.

Changing strategy is not the same as admitting failure. Ackman’s move away from activism in 2022 was a deliberate response to evidence about which approach worked best for him. Investors who cannot update their approach based on experience tend to repeat expensive mistakes.

This article does not recommend buying or selling any security. Ackman’s positions and his reasoning are described here for educational and informational purposes. Individual investment decisions should be made in consultation with a licensed financial advisor.

Frequently Asked Questions

Who is Bill Ackman? William Albert Ackman (born May 11, 1966, in Chappaqua, New York) is an American billionaire hedge fund manager and the founder and CEO of Pershing Square Capital Management. He is 60 years old in 2026. A Harvard undergraduate and Harvard Business School graduate, he launched Pershing Square in 2004 with approximately $54 million and has grown it to approximately $30.7 billion in assets under management.

What is Bill Ackman’s net worth? Ackman’s net worth is estimated by various sources in the range of $4 billion to $9 billion, with Forbes and Bloomberg both listing him as a billionaire. These are estimates, not officially disclosed figures. His wealth is primarily derived from his approximately 45% ownership stake in Pershing Square Inc., the management company, and his personal investment returns.

What does Bill Ackman’s current portfolio hold? Pershing Square Capital Management files quarterly 13F reports with the SEC disclosing its long U.S. equity positions. Based on recent confirmed filings, the fund maintains a concentrated portfolio of approximately 10 to 12 positions in large-cap, high-quality businesses. Core documented holdings have included Brookfield Corporation, Amazon, Uber Technologies, Microsoft, and Restaurant Brands International. For the most current verified holdings, readers should consult the most recent 13F filing directly on SEC EDGAR at sec.gov. We do not report specific allocation percentages or recent trade details beyond what can be confirmed from official primary sources.

What was Bill Ackman’s most successful trade? The General Growth Properties bankruptcy trade (2008–2010) is widely considered his most successful: Pershing Square invested approximately $60 million in the distressed mall REIT and recovered approximately $1.6 billion when the company emerged from bankruptcy, a return of roughly 27 times the initial capital. The March 2020 COVID pandemic hedge — $27 million in credit default swap protection that returned approximately $2.6 billion — is his most discussed single trade by the public.

What was Bill Ackman’s biggest investment mistake? Ackman himself has described his position in Valeant Pharmaceuticals as the worst investment decision of his career. Pershing Square built a large position in Valeant at prices above $200 per share; the stock collapsed following accounting and drug pricing controversies. The loss on the position is estimated at approximately $4 billion. He has discussed the failure in detail publicly, attributing it to insufficient due diligence on the company’s business model.

Why did Bill Ackman’s Herbalife short fail? Ackman announced a $1 billion short position in December 2012, arguing the company operated as a pyramid scheme. The trade failed primarily because the company survived long enough to outlast the short pressure, the FTC settlement in 2016 was ambiguous rather than a definitive regulatory finding, and competing institutional investors — notably Carl Icahn — went long on Herbalife in opposition. Ackman closed the short in 2018 at an estimated loss of approximately $1 billion.

What is Pershing Square Inc. and how does it relate to Pershing Square Capital Management? Pershing Square Inc. is a public parent entity created by Ackman as part of his stated ambition to build a permanent, scaled capital vehicle. It began filing its own 13F reports with the SEC in 2024 under CIK 0002026053, consolidating the fund’s U.S. equity positions. This is a distinct entity from the original Pershing Square Capital Management, L.P. (CIK 0001336528), which had filed separately since 2004. The Q2 2026 13F data in this article is sourced from the Pershing Square Inc. filing on SEC EDGAR.