Pump and Dump

Organised 'pools' that bid up stocks and sold to the public flourished on Wall Street in the 1920s and were exposed by the Senate's Pecora hearings (1932-34); the first notorious modern case was Jordan Belfort's Stratton Oakmont boiler room on Long Island in the late 1980s and 1990s.

Organised price manipulation flourished in 1920s US stock markets, where 'pools' of traders bid up shares, talked them up in the press and sold to the public, as exposed by the Senate's Pecora hearings (1932-1934). The Securities Exchange Act of 1934 outlawed such manipulation. In the 1980s-1990s 'boiler room' brokerages such as Jordan Belfort's Stratton Oakmont cold-called investors to push penny stocks they then sold. The internet moved the pitch to message boards and spam emails, and from around 2017 to crypto: Telegram 'pump groups', paid influencer touting of ICOs, and market makers faking trading volume. In October 2024 the FBI created its own token in 'Operation Token Mirrors' to catch crypto market-manipulation firms.

Insiders or promoters quietly buy a cheap, thinly traded stock or token. They then hype it with false or exaggerated claims through calls, social media, influencers, chat groups or fake trading volume (wash trading), so the price rises as new buyers pile in. Once the price is up, the promoters sell their holdings, the price collapses, and late buyers are left with large losses. With new crypto tokens, creators may also control most of the supply or the liquidity pool and pull it out (a 'rug pull').

It needs only a thinly traded stock or a freshly minted token, a Telegram group or influencer and a few hours: Chainalysis found 3.59% of all tokens launched in 2024 (74,037) showed pump-and-dump traits, and about 90% of suspect DEX pools were 'rugged' by their creator. Crypto has made it almost free, with launch platforms and wash-trading bots doing the work. Manipulation is hard to prove and most crypto pumpers are anonymous, though the FBI's Operation Token Mirrors charged 18 in 2024 and Belfort served 22 months.

There is no global total; Chainalysis estimated $2.57 billion of wash-trading volume on three chains in 2024 and identified 74,037 suspected pump-and-dump tokens that year. Historic cases include Stratton Oakmont, which cost investors about $200 million (US DOJ, 1999), and Avraham Eisenberg's $110 million Mango Markets manipulation. Retail buyers who arrive last lose almost everything, and the tactic has drained trust from small-cap and memecoin markets.