Card 1 of 11: Enron Short Thesis
In 2000, Jim Chanos realized that energy giant Enron was using mark-to-market accounting to book massive future profits on the day a deal was signed. When he dug into their cash flow statements, he found that despite reporting huge earnings, the company was actually bleeding cash.
In 1999, financial analyst Harry Markopolos realized that Bernie Madoff's impossibly consistent returns could not be replicated mathematically. He alerted the SEC multiple times that Madoff was running a massive Ponzi scheme, but was ignored for nearly a decade.
In 2002, David Einhorn publicly shorted Allied Capital, a private finance company, accusing them of systematically overvaluing their illiquid assets. Rather than answer the financial questions, Allied went after its critic — it later admitted that people acting for it had obtained Einhorn's phone records under false pretences. In 2007 the SEC found Allied had violated record-keeping and internal-control rules in valuing some of its holdings.
In May 2008, David Einhorn presented a blistering short thesis on Lehman Brothers, exposing a massive $32 billion discrepancy in their commercial real estate portfolio. He proved the bank was functionally insolvent months before its spectacular collapse.
Michael Burry, a value investor and former physician, concluded in 2005 that the US housing market was built on a foundation of fraudulent subprime mortgages. He convinced Wall Street banks to create a new instrument—Credit Default Swaps on mortgage bonds—so he could short the housing market.
In 2011, Muddy Waters Research accused Sino-Forest, a $6 billion Chinese forestry company listed in Canada, of being a massive fraud, alleging that much of the timber it claimed to own in China could not be found. The company collapsed into bankruptcy within a year, and in 2017 the Ontario Securities Commission found that Sino-Forest and several of its former executives had committed fraud.
In 2012, Bill Ackman launched a $1 billion short campaign against Herbalife, calling it the best-managed pyramid scheme in history. He argued the company made its money by recruiting distributors rather than by selling its nutrition products to outside customers. Herbalife denied it. In 2016 it settled with the US Federal Trade Commission — paying $200 million and agreeing to restructure how distributors are paid — without the FTC declaring it a pyramid scheme, and Ackman closed out his short at a large loss in 2018.
In 2015, Citron Research published a report comparing Valeant Pharmaceuticals to Enron, and the stock collapsed. The report focused on Valeant's undisclosed ties to Philidor, a specialty pharmacy that steered prescriptions toward Valeant's expensive branded drugs. Valeant cut ties with Philidor within weeks; in 2020 it paid $45 million to settle SEC charges over misleading disclosures about the arrangement.
In 2020, Muddy Waters received an anonymous 89-page report proving that Luckin Coffee, China's answer to Starbucks, was fabricating hundreds of millions of dollars in sales. The stock collapsed 80% shortly after.
In 2020, Hindenburg Research accused Nikola Motors, a highly valued hydrogen-truck startup, of being an 'intricate fraud' built on staged demonstrations. Founder Trevor Milton resigned that year; Nikola paid $125 million to settle SEC charges, and in 2022 a jury convicted Milton of securities and wire fraud. He was pardoned in 2025.