|Born||May 11, 1966|
|Alma mater||Harvard University (BA, MBA)|
|Occupation||Hedge fund manager|
|Employer||Pershing Square Capital Management|
(m. 1994; div. 2018)
William Albert Ackman (born May 11, 1966) is an American billionaire investor and hedge fund manager. He is the founder and CEO of Pershing Square Capital Management, a hedge fund management company. His investment approach makes him an activist investor. As of 2022[update], Ackman's net worth was estimated at $2.8 billion by Forbes.
Early life and education
Ackman was raised in Chappaqua, New York, the son of Ronnie I. (née Posner) and Lawrence David Ackman, the former chairman of a New York real estate financing firm, Ackman-Ziff Real Estate Group. He is of Ashkenazi Jewish descent. In 1988, he received a Bachelor of Arts degree magna cum laude in social studies from Harvard College. His thesis was "Scaling the Ivy Wall: the Jewish and Asian American Experience in Harvard Admissions." In 1992, he received an MBA from Harvard Business School.
In 1992, Ackman founded the investment firm Gotham Partners with fellow Harvard graduate David P. Berkowitz. The firm made small investments in public companies. In 1995, Ackman partnered with the insurance and real estate firm Leucadia National to bid for Rockefeller Center. Although they did not win the deal, the bid generated interest in Gotham from investors: three years later, Gotham had $500 million in assets under management (AUM). By 2002, Gotham had become entrenched in litigation with various external shareholders who also owned an interest in the companies in which Gotham invested.
In 2002 Ackman researched MBIA in order to challenge Standard & Poor's AAA rating of its bonds. He was charged fees for copying 725,000 pages of statements regarding the financial services company as part of his law firm's compliance with a subpoena. Ackman called for a division between MBIA's structured finance business and its municipal bond insurance business.
He argued that MBIA was legally restricted from trading billions of dollars of credit default swap (CDS) protection that MBIA had sold against various mortgage-backed collateralized debt obligations (CDOs), and was using a second corporation, LaCrosse Financial Products, which MBIA described as an "orphaned transformer." Ackman bought credit default swaps against MBIA corporate debt and sold them for a large profit during the financial crisis of 2007–2008. He reported covering his short position on MBIA on January 16, 2009, according to the 13D filed with the SEC.
In 2003, a feud developed between Ackman and Carl Icahn over a deal involving Hallwood Realty. They agreed to a "shmuck insurance" arrangement, under which, if Icahn were to sell the shares within 3 years and made a profit of 10% or more, he and Ackman would split the proceeds. Icahn paid $80 per share. In April 2004, HRPT Property Trust acquired Hallwood, paying $136.16 per share. Under the terms of the "contract", Icahn owed Ackman and his investors about $4.5 million. Icahn refused to pay. Ackman sued. Eight years later, Icahn was forced to pay the $4.5 million plus 9% interest per year, by court order.
Pershing Square Capital Management
In 2004, with $54 million from his personal funds and from his former business partner Leucadia National, Ackman started Pershing Square Capital Management. In 2005, Pershing bought a significant share in the fast food chain Wendy's International and successfully pressured it to sell its Tim Hortons doughnut chain. Wendy's spun off Tim Hortons through an IPO in 2006 and raised $670 million for Wendy's investors. After a dispute over executive succession that led Ackman to sell his shares at a substantial profit, the stock price collapsed, raising criticism that the sale of Wendy's fastest-growing unit left the company in a weaker market position. Ackman blamed the poor performance on their new CEO.
In December 2007, his fund held a 10% stake in Target Corporation, valued at $4.2 billion, through the purchase of stock and derivatives. In December 2010, his funds held a 38% stake in Borders Group and on December 6, 2010, Ackman indicated he would finance a buyout of Barnes & Noble for US$900M.
At a panel meeting discussing Bernie Madoff in January 2009, Ackman defended his longtime friend Ezra Merkin, saying, "Has Ezra committed a crime? I don't think so," and "I think [Merkin] is an honest person, an intelligent person, an interesting person, a smart investor." In April 2009, Merkin was charged with civil fraud by the State of New York for "secretly steering $2.4 billion in client money into Bernard Madoff's Ponzi fraud without their permission." A settlement was reached in June 2012 requiring Merkin to pay $405 million to victims including the Metropolitan Council on Jewish Poverty. 
In December 2012, Pershing Square Capital Management launched a new closed-end fund called Pershing Square Holdings, which raised $3 billion in an October 2014 IPO on Amsterdam's Euronext stock market. As a closed-end fund valued at $6.7 billion, PSH was designed as a permanent capital vehicle from which investors would not be able to directly withdraw funds. PSH reported 17.1% in returns since inception (Dec. 2012 – November 2017) under Ackman's management, 80% below the S&P 500.
Ackman started buying J. C. Penney shares in 2010, paying an average of $22 for 39 million shares or 18% of J.C. Penney's stock. In August 2013, Ackman's two-year campaign to transform the department store came to an abrupt end after he decided to step down from the board following an argument with fellow board members.
In a statement dated August 27, 2013, Pershing Square reported that it had hired Citigroup to liquidate the 39.1 million shares the firm then owned of the Plano, Texas-based department-store chain at a price of $12.90 per share, resulting in a loss of approximately $500 million. In January 2015, LCH Investments named Ackman one of the world's top 20 hedge fund managers after Pershing Square delivered $4.5 billion in net gains for investors in 2014, bringing the fund's lifetime gains to $11.6 billion since its launch in 2004 through year-end 2014.
On April 27, 2016, Ackman, along with Valeant Pharmaceuticals' outgoing CEO, J. Michael Pearson, and the company's former interim CEO, Howard Schiller, testified before the United States Senate Special Committee on Aging. The testifying panel answered questions related to the committee's concerns about repercussions to patients and the health care system posed by Valeant's business model and controversial pricing practices. Ackman opened his testimony saying, "As a shareholder of Valeant, I recognize my investment was an… endorsement of Valeant’s strategy." Ackman sold his remaining 27.2 million share position in Valeant to the investment bank Jefferies for about $300 million in March 2017. It has been estimated that the total cost of the position, including direct stock purchases and 9.1 million shares that were underlying stock options traded with Nomura Global Financial Products, was $4.6 billion, leading to a substantial loss.
This section provides insufficient context for those unfamiliar with the subject.(September 2019)
In December 2012, Ackman issued a research report that was critical of Herbalife's multi-level marketing business model, calling it a pyramid scheme. Ackman disclosed that his hedge fund, Pershing Square Capital Management, sold short the company's shares directly (not with derivatives) starting in May 2012, causing Herbalife's stock price to drop.
At an investor conference in January 2013, the company released results of a Nielsen Research International survey showing 73% of Herbalife distributors never intended to make money by reselling the product. Instead, they wanted to buy products at a discount for personal use. To make the distinction clearer, the company announced on its June 2013 earnings call that it would begin referring to these discount buyers as "members" rather than "distributors."
A few months after Ackman's initial comments, billionaire investor Carl Icahn challenged Ackman's comment in a public spat on national TV. Shortly thereafter, Icahn bought shares of Herbalife International. As Icahn continued to buy up HLF shares, the stock price continued to show strength. By May 2013, Icahn owned 16.5% of the company. That number had declined to 6.4% by November 2013.
Former Rep. Bob Barr (R-GA) called on Congress to investigate Ackman's use of public relations and regulatory pressure in his short campaign, and Harvey L. Pitt, a former chairman of the Securities and Exchange Commission, has questioned whether Ackman aims to move the price rather than spread the truth. In 2014, Senator Ed Markey wrote letters to federal regulators, including the FTC and the SEC, demanding they open an investigation into Herbalife's business practices. The day the letters were released, the company's stock dropped 14%. Markey later told the Boston Globe that his staff had not informed him that Ackman stood to benefit financially from his actions and defended the letters as a matter of consumer rights.
In March 2014, the New York Times reported that Ackman had employed tactics to undermine public confidence in Herbalife to lower its stock price, including pressuring state and federal regulators to investigate the company, paying individuals to travel to and participate in rallies against it, and boosting its spending on donations to nonprofit Latino organizations. According to the article, groups such as the Hispanic Federation and the National Consumers League sent federal regulators numerous letters. "Each person contacted by The Times acknowledged in interviews that they wrote the letters after being lobbied by representatives from Pershing Square, or said they did not remember writing the letters at all. Mr. Ackman's team also then started to make payments totaling about $130,000 to some of these groups, including the Hispanic Federation — money he said was being used to help find victims of Herbalife."
By December 2, 2014, stock prices had fallen nearly 50% to $42.08 from their January 8 high of $83.48. Later that month, Pershing Square Capital released a 2005 Herbalife distributor training session, in which an employee described high turnover rates and implied that the company's business model was not sustainable. According to an unnamed source speaking to the New York Post, the video had previously been subpoenaed by federal investigators. In an interview with Bloomberg, Ackman predicted that the company would experience an "implosion" in 2015 or early 2016, citing federal scrutiny and debt.
On March 12, 2015, The Wall Street Journal reported that prosecutors in the Manhattan U.S. attorney's office and the FBI were investigating whether people hired by Ackman "made false statements about Herbalife's business model to regulators and others in order to spur investigations into the company and lower its stock price." In March 2015, U.S. District Judge Dale Fischer, in Los Angeles, California, dismissed a suit filed by Herbalife investors alleging the company is operating an illegal pyramid scheme. In response to Fischer's ruling, Herbalife stock rose approximately 13%. Herbalife and the FTC reached a settlement agreement in July 2016, ending the agency's investigation into the company. On the day of the settlement, Fortune estimated that Ackman lost $500 million.
Ackman's position on Herbalife led to a discussion on live television with Herbalife supporter Carl Icahn for nearly half an hour on CNBC on January 25, 2013. During the segment, Icahn called Ackman "a crybaby in the schoolyard" and claimed that going public with his short position would eventually force Ackman into the "mother of all short squeezes". On November 22, 2013, Ackman admitted on Bloomberg Television that Pershing Square's open short position in Herbalife was "$400 million to $500 million" in the red, but that he wouldn't be squeezed out and would hold the short "to the end of the earth."
In November 2017, Ackman told Reuters that he had covered his short-sell position, but would continue to bet against Herbalife using put options with no more than 3% of Pershing Square's funds.
On February 28, 2018, Ackman exited his near billion-dollar bet against Herbalife after the company's stock price continued to rise, choosing to build his position in United Technologies instead.
Ahead of the 2020 stock market crash, Ackman hedged Pershing Square's portfolio, risking $27 million to purchase credit protection, insuring the portfolio against steep market losses. The hedge was effective, generating $2.6 billion in less than one month.
On March 18, 2020, in an emotional interview with CNBC, Ackman called upon President Trump for a "30-day shutdown" of the American economy to slow the spread of coronavirus and minimize loss of life and ensuing economic destruction resulting from the shutdown. Ackman warned that without intervention, hotel stocks were “going to zero” and said that America could “end as we know it." He also cautioned U.S. companies to stop stock buyback programs because “hell is coming.”
Ackman later received criticism for actively buying discounted equity stakes in the very companies he was warning could fail; however, Ackman already had realized roughly half of the gains before appearing during the CNBC interview.
In a November 2020 interview, Ackman said that he had grown concerned about COVID-19 because he had seen the film Contagion and offered qualified praise for Trump's presidency, saying that Trump has "done a lot of good. He's done some harm as well".
Pershing Square Tontine Holdings
In June 2020, Ackman's Pershing Square Tontine Holdings, Ltd (PSTH), filed $4 billion for the largest-ever blank-check company IPO. In July 2022, Ackman addressed PSTH shareholders saying that he would return the funds of the SPAC as he was "unable to consummate a transaction that both meets our investment criteria and is executable."
In January 2022, Ackman disclosed that Pershing Square acquired a $1.1 billion stake in Netflix. Netflix stock had just experienced a precipitous 30% selloff after announcement of a disappointing subscriber growth outlook for Q1 2022. In a letter to its investors, Ackman praised Netflix's "best-in-class management team" and said he long admired Netflix CEO Reed Hastings and the "remarkable company he and his team have built."
In April, Netflix stock fell by 35%, and Ackman responded by selling his entire stake in the company.
Ackman has said that his most successful investments have always been controversial, and that his first rule of activist investing is to "make a bold call that nobody believes in".
Ackman's investing style has been praised and criticized by U.S. government officials, heads of other hedge funds, various retail investors, and the general public. His most notable market plays include shorting MBIA's bonds during the financial crisis of 2007–2008, his proxy fight with Canadian Pacific Railway, and his stakes in the Target Corporation, Valeant Pharmaceuticals, and Chipotle Mexican Grill. From 2012 to 2018, Ackman held a US$1 billion short against the nutrition company Herbalife, a company he has claimed is a pyramid scheme designed as a multi-level marketing firm. His efforts were reported in the documentary film Betting on Zero.
After weak performance in 2015–2018, Ackman told investors in January 2018 that he was going to go back to basics by cutting staff, ending investor visits that were eating into his time, and hunkering down in the office to do research. The next year, Pershing Square returned 58.1%, which Reuters says qualified it as "one of the world’s best performing hedge funds" for 2019.
Ackman has given to charitable causes such as the Center for Jewish History, where he spearheaded a successful effort to retire $30 million in debt, personally contributing $6.8 million. The donation, along with those of Bruce Berkowitz, founder of Fairholme Capital Management, and Joseph Steinberg, president of Leucadia National, were the three largest individual gifts the center has ever received.
Ackman's foundation donated $1.1 million to the Innocence Project in New York City and Centurion Ministries in Princeton, N.J. He is a signatory of The Giving Pledge, committing himself to give away at least 50% of his wealth to charitable causes.
In 2006, Ackman, and then wife Karen, founded the Pershing Square Foundation to support innovation in economic development, education, healthcare, human rights, arts and urban development. The foundation is a major donor to Planned Parenthood. Since its inception, the foundation has committed more than $400 million in grants since 2006. In 2011, the Ackmans were on The Chronicle of Philanthropy's "Philanthropy 50" list of the most generous donors.
In July 2014, Challenged Athletes Foundation, which provides sports equipment to those with physical disabilities, honored Ackman at a gala fundraiser at the Waldorf Astoria hotel in New York City for helping raise a record $2.3 million.
Ackman endorsed Michael Bloomberg as a prospective candidate for President of the United States in the 2016 presidential election. He is a longtime donor to Democratic candidates and organizations, including Richard Blumenthal, Chuck Schumer, Robert Menendez, the Democratic National Committee, and the Democratic Senatorial Campaign Committee.
- Gordon, Amanda (May 12, 2013). "Scene Last Night: Icahn, Ackman, Bruce Richards, Gloria Steinem". Bloomberg News. Archived from the original on November 22, 2015.
- "#1941 William Ackman". Forbes. Forbes Media LLC. November 12, 2019. Archived from the original on June 6, 2020. Retrieved February 12, 2018.
- Smith, Emily (December 22, 2016). "Billionaire investor Bill Ackman and wife in 'big-money divorce'". Page Six. Archived from the original on January 1, 2017. Retrieved December 31, 2016.
- "Bill Ackman reportedly splitting with wife in big-money divorce". CNBC. Archived from the original on February 24, 2017. Retrieved February 24, 2017.
- O'Donnell, Carl; Herbst-Bayliss, Svea (November 23, 2015). "Ackman boosts stake in drugmaker Valeant". New York, N.Y., United States: Reuters. Thompson Reuters. Archived from the original on November 10, 2019. Retrieved December 24, 2015.
- "What Activist Investors Do, According to Bill Ackman". finance.yahoo.com. Retrieved July 20, 2021.
- "Bill Ackman: what I think of GameStop and shareholder activism". www.ii.co.uk. Retrieved July 20, 2021.
- English, Carleton. "Activist investor Bill Ackman is now feeling positive about the markets". www.fnlondon.com. Retrieved July 20, 2021.
- "William Ackman". Forbes. 2022. Retrieved June 16, 2022.
- Serres, Chris (January 13, 2008). "William Ackman: Targeting Target". United States: StarTribune (Minnesota). Star Tribune Media Company, LLC. Archived from the original on May 29, 2012. Retrieved May 16, 2009.
- "Miss Ronnie I. Posner Bride of L.D. Ackman". The New York Times. The New York Times Company. October 7, 1963. p. 27. Archived from the original on July 23, 2018. Retrieved November 9, 2019.
- Holden Walter-Warner (June 2, 2022). "Larry Ackman, former Ackman-Ziff CEO, dies". The Real Deal.
- Mallozzi, Vincent (January 19, 2019). "As If by Design, Their Connection Was Inevitable". The New York Times. New York, N.Y., United States. The New York Times Company. p. 13. Archived from the original on March 17, 2019. Retrieved May 23, 2019.
- "Jews take 5 of top 6 spots in annual list of top US givers". The Jerusalem Post. September 2, 2011. Archived from the original on January 17, 2012.
- Joffe, Alex (February 23, 2011). "Jewish Philanthropy 2.0". ejewishphilanthropy.co. Archived from the original on January 21, 2012.
- Ackman, William Albert. "Scaling the ivy wall: the Jewish and Asian American experience in Harvard admissions". Classify. OCLC Research. Archived from the original on December 2, 2019. Retrieved May 21, 2015.
- Ackman profile Archived January 21, 2016, at the Wayback Machine, harvard.edu; retrieved December 24, 2015.
- Fromson, Brett (July 10, 1994). "The Rookies' Big Score". The Washington Post. United States. The Washington Post. Archived from the original on April 8, 2019. Retrieved November 12, 2019.
- "MBIA: Call to divide not viable". CNN. February 20, 2008. Archived from the original on February 27, 2008. Retrieved February 26, 2008.
- "MBIA's biggest bear". The Globe and Mail. February 1, 2008 – via Bloomberg News.
- "Bill Ackman's Pershing Square Files 13D on Borders, Covers MBIA Short". market folly. marketfolly.com. January 26, 2009. Archived from the original on November 12, 2019. Retrieved November 12, 2019.
- Lopez, Linette (January 25, 2013). "Here's the 'Shmuck Insurance' Contract that Carl Icahn Just Mentioned on CNBC..." United States: Business Insider. Business Insider Inc. Archived from the original on November 10, 2019. Retrieved February 12, 2018.
- Bary, Andrew (May 25, 2009). "Ackman's Target Campaign Is Off-Target". Online.barrons.com. Archived from the original on December 12, 2013. Retrieved July 28, 2014.
- Merced, Michael J. de la (December 6, 2010). "Ackman Offers to Finance a Borders Bid for Barnes & Noble". DealBook. Retrieved March 12, 2021.
- Freed, Dan (January 16, 2009). "Hedge Fund Peers Come to Merkin's Defense". TheStreet.com. Archived from the original on July 1, 2015. Retrieved December 22, 2012.
- Kouwe, Zachery (January 16, 2009). "Despite Madoff, Merkin Still Has Some Defenders". The New York Times. No. DealBook. United States. The New York Times Company. Archived from the original on September 6, 2017. Retrieved November 9, 2019.
- Cohen, Patricia (January 16, 2009). "Is Madoff Not So Good for the Jews? Discuss Among Yourselves". The New York Times. New York, N.Y., United States. The New York Times Company. p. C1. Archived from the original on January 5, 2017. Retrieved November 9, 2019.
- Graybow, Martha; Chasan, Emily (April 6, 2009). "Merkin charged with civil fraud in Madoff case". New York, N.Y., United States: Reuters. Thompson Reuters. Archived from the original on September 5, 2017. Retrieved November 9, 2019.
- Henriques, Diana B. (June 24, 2012). "Hedge Fund Manager to Pay $405 Million in Madoff Settlement". The New York Times. ISSN 0362-4331. Retrieved July 1, 2022.
- Bray, Chad (October 13, 2014). "Ackman Fund's I.P.O. Has Rough Debut in Amsterdam". The New York Times. No. DealBook. United States. The New York Times Company. Archived from the original on January 27, 2018. Retrieved January 26, 2018.
- Sender, Henny; Foley, Stephen (January 4, 2015). "Permanent capital: Perpetual cash machines". Financial Times. Nikkei. Archived from the original on January 27, 2018. Retrieved November 9, 2019.
- "Pershing Square 3Q17 Investor Letter" (PDF). November 15, 2017. Archived (PDF) from the original on January 27, 2018. Retrieved May 13, 2016.
- Wahba, Phil; Goldstein, Matthew (August 13, 2013). "Ackman quits J.C.Penney board, removing distraction". New York, NY: Reuters. Thompson Reuters. Archived from the original on November 10, 2019. Retrieved November 9, 2019.
- Townsend, Matt (August 27, 2013). "Ackman Takes $500 Million Loss on Penney as Saga Ends". Bloomberg News. Bloomberg L.P. Archived from the original on April 6, 2017. Retrieved March 21, 2017.
- Cosgrave, Jenny (January 26, 2015). "Ackman's returns make him a top 20 fund manager". CNBC.com. CNBC. Archived from the original on August 16, 2017. Retrieved March 21, 2017.
- Lopez, Linette (April 27, 2016). "Bill Ackman and Valeant Execs just got through one of the most brutal Senate hearings we've ever seen". Business Insider. Business Insider Inc. Archived from the original on November 12, 2019. Retrieved May 31, 2016.
- Levine, Matt (March 14, 2017). "Bill Ackman Is Done Losing Money on Valeant". Bloomberg News. Bloomberg L.P. Archived from the original on March 16, 2017. Retrieved March 17, 2017.
- Vardi, Nathan (March 13, 2017). "Billionaire Bill Ackman Sells Disastrous Valeant Investment After Nearly $4 Billion Loss". Forbes. Forbes Media LLC. Archived from the original on March 15, 2017. Retrieved November 12, 2019.
- Alden, William (December 20, 2012). "Ackman Outlines Bet Against Herbalife". The New York Times. No. DealBook. United States. The New York Times Company. Archived from the original on September 6, 2017. Retrieved December 20, 2012.
- "Herbalife Investor Day Presentation" (PDF). Archived from the original (PDF) on March 4, 2016. Retrieved October 2, 2019.
- "Herbalife Earnings Call Transcript" (PDF). Archived from the original (PDF) on March 4, 2016. Retrieved October 2, 2019.
- O'Toole, James (February 14, 2013). "Icahn challenges Ackman with 13% Herbalife stake". CNN Money. Archived from the original on January 22, 2015. Retrieved January 22, 2015.
- Benoit, David (May 7, 2013). "Carl Icahn Buys More Herbalife". The Wall Street Journal. Eastern Edition. No. Blogs. United States: Wall Street Journal. Dow Jones & Company Inc. ISSN 0099-9660. Archived from the original on November 6, 2019. Retrieved November 9, 2019.
- Stanford, Duane (November 20, 2013). "Stiritz Boosts Herbalife Stake, Seeks Strategy Talks". Bloomberg News. Bloomberg L.P. Archived from the original on December 22, 2019. Retrieved November 12, 2019.
- Roff, Peter (April 8, 2015). "Misusing Markets". U.S. News & World Report. Archived from the original on July 17, 2015. Retrieved July 15, 2015.
- "Bill Ackman Says He's Spent $50 Million on Herbalife Battle". The Street. Archived from the original on September 5, 2017. Retrieved July 25, 2020.
- "Congress Should Launch Investigation of Short Sale Market". Roll Call. April 20, 2015. Archived from the original on June 23, 2015. Retrieved June 23, 2015.
- Schmidt, Michael (March 9, 2014). "After Big Bet, Hedge Fund Pulls the Levers of Power". The New York Times. United States. The New York Times Company. Archived from the original on January 14, 2017. Retrieved March 24, 2014.
- "Markey says he was unaware actions would aid firm's rival". Boston Globe. March 10, 2014. Archived from the original on July 8, 2015. Retrieved July 8, 2015.
- Stempel, Jonathan (December 3, 2014). "Herbalife wins court approval for class-action settlement". Yahoo! News. Reuters. Archived from the original on October 2, 2019. Retrieved December 6, 2014.
- "Top Herbalife Salesman Acknowledges High Failure Rate In Video". Business Insider. Business Insider Inc. December 17, 2014. Archived from the original on October 2, 2019. Retrieved December 19, 2014.
- Celarier, Michelle (December 17, 2014). "Top Herbalife salesman admitted 'deception,' high failure rate". New York Post. NYP Holdings, Inc. Archived from the original on October 2, 2019. Retrieved December 19, 2014.
- Whitehouse, Kaja (December 17, 2014). "Bill Ackman takes shot at Herbalife with new video". USA Today. Archived from the original on December 17, 2014. Retrieved December 19, 2014.
- Stanford, Duane (December 19, 2017). "Ackman Says Former Herbalife Workers Turn State's Evidence". Bloomberg News. Bloomberg L.P. Archived from the original on December 18, 2014. Retrieved December 17, 2014.
- Lopez, Linette (March 13, 2015). "REPORT: The FBI is investigating Bill Ackman over Herbalife". Business Insider. Business Insider Inc. Archived from the original on June 17, 2015. Retrieved June 16, 2015.
- Holm, Erik (March 13, 2015). "Bill Ackman Not Backing Down On Herbalife". The Wall Street Journal. Eastern Edition. No. MoneyBeatBlogs. United States: Wall Street Journal. Dow Jones & Company Inc. ISSN 0099-9660. Archived from the original on July 12, 2017. Retrieved June 16, 2015.
- Zacks Equity Research (March 20, 2015). "Herbalife Soars as Judge Dismisses Lawsuit (revised)". Yahoo Finance. Verizon Media. Archived from the original on July 9, 2017. Retrieved March 23, 2015.
- Wieczner, Jen (July 15, 2016). "The Real Winners and Losers in the Herbalife-Bill Ackman War". Fortune. Fortune Media IP Limited. Archived from the original on November 12, 2019. Retrieved November 12, 2019.
- "The Ichan-Ackman Feud". CNBC. Archived from the original on February 1, 2013. Retrieved July 28, 2014.
- "Men Dislike Each Other, Might Also Have Opinions On A Stock". Dealbreaker.com. January 25, 2013. Archived from the original on April 8, 2013. Retrieved July 28, 2014.
- Cohan, William (March 7, 2013). "The Big Short War". Vanity Fair. Condé Nast. Archived from the original on August 9, 2015. Retrieved July 31, 2015.
- Stevenson, Alexandra (November 22, 2013). "Ackman Vows to Take Bet Against Herbalife 'to the End of the Earth'". The New York Times. No. DealBook. United States. The New York Times Company. Archived from the original on December 4, 2013. Retrieved November 23, 2013.
- Herbst-Bayliss, Svea (November 1, 2017). "Ackman makes new bet against Herbalife with options". USA: Reuters. Thompson Reuters. Archived from the original on February 28, 2018. Retrieved February 28, 2018.
- Benoit, David (March 1, 2018). "Bill Ackman Surrenders in His Five-Year War Against Herbalife". The Wall Street Journal. Eastern Edition. USA: Wall Street Journal. Dow Jones & Company Inc. ISSN 0099-9660. Archived from the original on March 1, 2018. Retrieved February 28, 2018.
- "Pershing Square Capital Management, L.P. Releases Letter to Investors". Pershing Square Holdings, Ltd. March 25, 2020. Archived from the original on June 10, 2020. Retrieved March 26, 2020.
- Driebusch, Corrie (March 25, 2020). "Ackman Has Big Win on Bearish Market Bet". Wall Street Journal. ISSN 0099-9660. Archived from the original on June 4, 2020. Retrieved March 26, 2020.
- Franck, Thomas (March 18, 2020). "Investor Bill Ackman advises Trump to shut down the country, saying stock market 'will soar'". CNBC. Archived from the original on April 1, 2020. Retrieved March 26, 2020.
- Franck, Thomas. "Bill Ackman says accusations he tried to drive down market in interview are 'absurd'". CNBC. Archived from the original on June 19, 2020. Retrieved April 14, 2020.
- Neate, Rupert. "'Hell is coming': how Bill Ackman's TV interview tanked the markets and made him $2.6bn". The Guardian. Archived from the original on July 2, 2020. Retrieved April 20, 2020.
- English, Carleton. "Bill Ackman Defends CNBC Interview and $2.6 Billion Profit in Letter to Investors". Barron's. Archived from the original on June 21, 2020. Retrieved May 31, 2020.
- GmbH, finanzen net. "Billionaire investor Bill Ackman discussed his pandemic hedge, praised Trump, and explained his Berkshire Hathaway exit in a recent interview. Here are the 19 best quotes". markets.businessinsider.com. Retrieved November 27, 2020.
- Squire, Kenneth (June 22, 2020). "Bill Ackman and Tontine Holdings rewrite the terms for SPACs". CNBC.
- Hirsch, Lauren (July 11, 2022). "Largest-ever SPAC will return $4 billion to investors after failing to complete a deal". The New York Times. Archived from the original on July 12, 2022.
- "Ackman Loses More Than $430 Million on 3-Month Netflix Bet". Bloomberg.com. April 20, 2022. Retrieved April 21, 2022.
- "Bill Ackman's Rules For Investing Like a Maverick". YouTube. Archived from the original on June 19, 2020. Retrieved July 26, 2020.
- McNish, Jacquie (March 7, 2022). "William Ackman Takes Stake in Canadian Pacific". The Wall Street Journal. Archived from the original on March 8, 2022.
- Squire, Kenneth (March 12, 2022). "Ackman's Pershing Square is back at Canadian Pacific". CNBC.
- Vardi, Nathan (March 13, 2017). "Billionaire Bill Ackman Sells Disastrous Valeant Investment After Nearly $4 Billion Loss". Forbes.
- Morris, Chris (April 20, 2022). "Bill Ackman bet $1.1 billion on Netflix months ago and now he's taking a beating. But the famed investor has doubled down before—and come out ahead". Fortune.
- Parloff, Roger (September 9, 2015). "The siege of Herbalife". Fortune. Fortune Media IP Limited. Archived from the original on December 5, 2019. Retrieved June 21, 2017.
- Carroll, Rory (April 11, 2017). "Betting on Zero: Herbalife doc feeds investors' feud as director claims 'dirty tricks'". The Guardian. Guardian News and Media Limited. Archived from the original on March 28, 2020. Retrieved December 6, 2017.
- "Ackman avoids limelight even as Pershing Square posts record 2019". January 9, 2020. Archived from the original on March 25, 2020. Retrieved July 26, 2020 – via www.reuters.com.
- Parrish, Shane (April 28, 2020). "The Knowledge Project #82 — Bill Ackman". Youtube. Archived from the original on August 12, 2020. Retrieved August 12, 2020.
- The Center For Jewish History: "Single Largest Fund-Raising Effort Since Building was Completed in 2000" Archived January 17, 2013, at the Wayback Machine January 24, 2011
- The Chronicle of Philanthropy: "A Brash Hedge-Fund Manager Applies His Tactics to Philanthropy" By Caroline Preston Archived November 2, 2012, at the Wayback Machine February 6, 2011
- Business Insider: "What The Richest People On Wall Street's Charity Donations Say About Them" by Mamta Badkar and Courtney Comstock Archived May 14, 2013, at the Wayback Machine November 12, 2010
- The Jewish Week: "History Center In The Black" by Tamar Snyder Archived October 21, 2012, at the Wayback Machine January 25, 2011
- Jewish Voice New York: "Jewish Billionaires Join Group Pledging Majority of Their Wealth to Charity" by Sholom Schreiber Archived June 25, 2013, at the Wayback Machine April 25, 2005
- "Founders". Pershing Square Foundation website. Archived from the original on July 6, 2015. Retrieved July 28, 2015.
- "Bill Ackman: The fighter". Jewish Business News. February 3, 2013. Archived from the original on May 23, 2019. Retrieved May 23, 2019.
- "Planned Parenthood". Pershing Square Foundation. Archived from the original on January 27, 2020. Retrieved February 9, 2020.
- "Philanthropy 50". Philanthropy.com. February 6, 2011. Archived from the original on August 12, 2014. Retrieved July 28, 2014.
- Wieczner, Jen (July 21, 2014). "New hedgie standoff: 'frenemies' Bill Ackman and Dan Loeb compete in charitable giving". Fortune. Archived from the original on March 12, 2016. Retrieved June 9, 2016.
- "Billionaire Ackman donates millions of Coupang shares to foundation, others". finance.yahoo.com. Retrieved March 15, 2021.
- "WEDDINGS; Karen Herskovitz, William Ackman". The New York Times. United States. The New York Times Company. July 10, 1994. p. 37. Archived from the original on June 14, 2018. Retrieved November 9, 2019.
- Cohan, William D. (March 7, 2013). "The Big Short War". Vanity Fair.
- Kolhatkar, Sheelah (February 26, 2017). "Financiers Fight Over the American Dream". The New Yorker.
- Sullivan, Mark (October 9, 2018). "Activist investor Bill Ackman is engaged to rockstar professor Neri Oxman". Fast Company. Archived from the original on November 30, 2018. Retrieved December 24, 2018.
- Riley Cardoza, "Brad Pitt’s MIT Professor Crush Neri Oxman Gives Birth to Her First Child" Archived March 27, 2020, at the Wayback Machine, US Magazine, August 9, 2019
- Ackman, William (February 11, 2016). "America is burning but Michael Bloomberg can put out the fire". Financial Times. Archived from the original on February 12, 2016. Retrieved February 11, 2016.
- "FEC Individual Contribution Search". Federal Election Commission. Archived from the original on January 29, 2018. Retrieved February 2, 2018.
- investarygroup (July 23, 2014), Pershing Square Bill Ackman Herbalife Presentation 2014 (FULL PRESENTATION), archived from the original on August 19, 2017, retrieved January 21, 2017
- Cheffins, Brian R. (2014). "Hedge Fund Activism Canadian Style". University of British Columbia Law Review. 47 (1): 1-59 (Discussing Pershing Square's activities in Canada, and a unique cultural reluctance to support active value creation by ethical intervening shareholders). SSRN 2204294.
- Rojas, Claudio R. (2014). "An Indeterminate Theory of Canadian Corporate Law". University of British Columbia Law Review. 47 (1): 59-128 ("The author's perspective on Berkshire Hathaway's investment philosophy was informed by discussions with Warren Buffett in Omaha, Nebraska": pp. 59, 122-124). SSRN 2391775.
- Richard, Christine. Confidence Game (Wiley, 2010) with Bloomberg News.
- Shane Parrish (2020). "Bill Ackman: Getting Back Up" (Podcast). Farnam Street's The Knowledge Project. Retrieved July 26, 2020.