Bill Ackman is an American hedge fund manager and the founder and chief executive of Pershing Square Capital Management, one of the best known activist investing firms in the world. He is famous for running a very concentrated book of a handful of shares, for pushing companies to change, and for a small number of enormous wins and losses that have made him a household name in markets. His London-listed fund, Pershing Square Holdings, means investors outside the United States can follow his portfolio without a Wall Street account.
This is an educational profile of a working investor, not investment advice and not an endorsement. It covers his documented investing career, the trades that defined it, and what any trader can take from his approach.
Who is Bill Ackman?
William Albert Ackman was born in New York in May 1966 and studied at Harvard, earning a degree and later an MBA from its business school. He got his start running a small firm called Gotham Partners in the 1990s, which he wound down, and then founded Pershing Square Capital Management in 2004 with a modest amount of money. Over the next two decades he built it into a firm managing tens of billions of dollars.
Ackman is what the market calls an activist. Rather than quietly holding shares, an activist investor takes a big stake in a company and then argues, sometimes very publicly, for a change of strategy or management. Ackman built his reputation on that style, running detailed research campaigns, presenting long slide decks, and saying loudly why he thinks a share is worth far more, or far less, than the price on the screen.
What is Bill Ackman’s Pershing Square?
When people talk about Bill Ackman’s Pershing Square they usually mean two connected things. The first is Pershing Square Capital Management, the investment firm he founded and still runs for institutions and wealthy clients. The second is Pershing Square Holdings, the part most relevant to ordinary investors.
Pershing Square Holdings is a closed-end fund that invests alongside Ackman’s other money and holds the same concentrated set of shares. Its stock first traded on Euronext Amsterdam in 2014, and since 2017 its main listing has been on the premium segment of the London Stock Exchange; in early 2025 the fund delisted from Amsterdam to consolidate trading in London. Because it is a European-listed vehicle, it gives investors outside America a way to track Ackman’s ideas, unusual for a fund run by a New York manager. You can read its own summary on the Pershing Square Holdings site.
What is Bill Ackman’s net worth?
Estimates of Bill Ackman’s net worth vary between publishers and move with markets, so any figure is a snapshot. As of 2026, Forbes valued his fortune at roughly nine billion dollars, placing him among the several hundred wealthiest people it tracks, while other services such as Bloomberg have carried a lower figure. Most of that wealth comes from his ownership of the Pershing Square business and his personal stake in its funds rather than a salary.
What are Bill Ackman’s most famous trades?
Ackman’s record is a study in concentration. A few positions made his name, and a couple nearly unmade it. The table below sets out the trades most often tied to him.
| Trade | What happened |
| 2020 credit hedge | Turned about $27 million of credit protection into around $2.6 billion in weeks as markets crashed |
| MBIA short | A years-long bet against the bond insurer that paid off in the 2008 financial crisis |
| Herbalife short | A roughly $1 billion public short that failed, exited in 2018 after a long feud with Carl Icahn |
| General Growth Properties | A distressed property bet during the crisis that became one of his biggest wins |
| Valeant Pharmaceuticals | A concentrated position that lost close to $4 billion before he sold in 2017 |
The single most celebrated is the 2020 hedge. Early that year, worried about the coming pandemic, Ackman spent about 27 million dollars buying credit protection, a form of insurance that pays out when company debt gets riskier, using credit default swaps. When markets fell apart in March, that position was worth around 2.6 billion dollars, a return of roughly a hundred times in weeks, as Forbes reported at the time. It is now taught as a business school case study.
His shorts are just as well known. From 2002 he spent years betting against the bond insurer MBIA, arguing its guarantees were far weaker than its top credit rating suggested, and that call paid off when the crisis arrived. Herbalife went the other way. Ackman took a short of about a billion dollars in the supplements company in 2012 and called it a pyramid scheme, only for the rival investor Carl Icahn to buy the other side. After a five-year fight and a famous televised shouting match, Ackman walked away from the bet in 2018 at a heavy loss.
On the long side, his crisis-era bet on the American mall owner General Growth Properties reportedly turned a modest investment into billions and is often called his best ever. Valeant Pharmaceuticals was the mirror image, a drug company he backed heavily and then sold in 2017 at a loss of close to four billion dollars, a mistake he later admitted plainly.
What is in Bill Ackman’s portfolio?
The defining feature of Bill Ackman’s portfolio is how few names it contains. Pershing Square typically holds only around eight to twelve core positions at a time, mostly large, well-known companies it intends to own for years. Positions change, so the right way to read it is always as of the most recent filings rather than a fixed list.
In recent years those core holdings have included the restaurant chain Chipotle, which he first backed in 2016, along with hotel, property and consumer names. Pershing Square Holdings also built a large stake in Universal Music Group, the Amsterdam-listed owner of a huge music catalogue, which for a time became one of its biggest positions and gave the fund a European anchor. Not every idea works: Ackman bought into Netflix in early 2022 and sold within months at a loss of several hundred million dollars once the shares fell. Judging whether any of these businesses is fairly priced is the work of fundamental analysis, the same reading of accounts and cash flows that underpins his style.
What can traders learn from Bill Ackman?
The clearest lesson is the power, and the danger, of concentration. Holding a handful of positions can produce spectacular returns when the calls are right, as the 2020 hedge and General Growth showed, and hurt badly when they are wrong, as Herbalife and Valeant proved. His other habit is worth borrowing: he does deep homework before he commits, and sizes a position to his conviction while accepting he can still lose. To see how investors go long or short, the mechanics of short selling are a good place to start, and the wider Volity education hub covers the research basics his approach depends on. Ackman works in the value tradition of Warren Buffett and Charlie Munger, and his willingness to bet big against the crowd echoes fellow contrarian Michael Burry.
You do not need a fund like his to take exposure to the sort of shares and indices Ackman trades. On the Volity trading platform, stocks, indices, commodities and crypto sit in one account and you trade the price as a contract for difference, long or short, on the Volity MT platform. This is CFD price exposure, not ownership of the underlying shares, so you trade how the price moves rather than holding stock in a company. A free demo account lets you practise the patience his method requires before you risk real money. Keep the health warning in view: CFDs are leveraged, with leverage up to 1:500 depending on the product, so positions can move for or against you quickly, and the FCA treats them as high-risk investments. None of this is a recommendation to copy any position; it is general information.
Getting started is deliberately light. You can open a Volity account for $0, practise on the free demo, invest from $1, and start trading from $1. Volity’s trading execution is regulated by CySEC under UBK Markets, licence 186/12, with client funds held in segregated accounts.
Frequently asked questions
Who is Bill Ackman?
Bill Ackman is an American hedge fund manager, born in 1966, who founded Pershing Square Capital Management in 2004. He is known as an activist investor who takes large stakes in a small number of companies and pushes for change, and for high-profile trades including a credit hedge in 2020 that turned about $27 million into around $2.6 billion.
What is Pershing Square Holdings?
Pershing Square Holdings is a closed-end fund managed by Bill Ackman that holds the same concentrated portfolio as his main firm. Its shares trade on the London Stock Exchange, having earlier also traded in Amsterdam, so investors outside the United States can gain exposure to his strategy through a listed vehicle.
What is Bill Ackman’s net worth?
Estimates differ and change with markets. As of 2026, Forbes put Bill Ackman’s net worth at roughly nine billion dollars, with other publishers carrying a lower figure. Most of it comes from his ownership of Pershing Square and his personal investment in its funds rather than a salary.
Ordinary investors cannot copy a hedge fund directly, and this profile is not advice to try. On a platform such as Volity you can take CFD price exposure to many of the large shares and indices in his world, long or short, which tracks the price rather than giving you ownership. Because CFDs are leveraged and high-risk, a free demo account is a sensible way to learn first.
