Money & Finance › Fraud, scams & enforcement › Securities fraud: lying to investors and rigging markets
Pump-and-dump schemes
· Fraud or scheme
Fact, law or dataA rule, statute, definition or measured number.
Promoters buy a cheap, little-traded stock or token, hype it to push the price up, then sell to the buyers they lured.
See it on the Money & Finance map →How it works
The classic version uses penny stocks: tiny companies trading over the counter, where a few orders move the price. Promoters buy quietly, then 'pump' with tips by phone, email, newsletters or, now, Telegram, Discord and WhatsApp groups. As outsiders pile in, the insiders 'dump' their shares. With no real buying left, the price collapses, often within days, and late arrivals hold the losses. It is market manipulation, illegal under the Securities Exchange Act of 1934.
Why it matters
It is one of the most common ways small investors lose money to manipulation. Regulators' standard warning signs: unsolicited tips, pressure to act fast, and tiny companies with no revenue.
Think of it like
Like staging fake bids on a vacant lot so real buyers overpay, then selling to them before the price resets.
Facts, rules and data
SEC and DOJ cases, including the 1990s Stratton Oakmont boiler room behind 'The Wolf of Wall Street', SEC trading suspensions, and academic studies of hundreds of coordinated Telegram crypto pumps.
Debates and risks
Which anti-manipulation rules apply to a crypto pump depends on whether the token counts as a security, which US courts and agencies still contest.
Connections (2)
▸Pump-and-dump schemes thrive in CryptocurrencyFact, law or data
The connection
New tokens trade on lightly regulated exchanges with little volume, so small groups can move prices. Organizers announce a coin in Telegram or Discord channels; insiders buy first, members pile in, and insiders sell within minutes. Anonymous creators of 'meme coins' may also dump their own supply, called a rug pull.
When and why
Since about 2017, on offshore exchanges and decentralized platforms; meme-coin launches surged in 2024–25.
How we know
Academic studies have identified thousands of pump events, and in 2024 the DOJ charged crypto 'market makers' caught by an FBI sting using its own token.
Debates and risks
Whether many tokens are securities, and so covered by anti-manipulation rules, is still fought over; the SEC eased its crypto stance in 2025.
▸Pump-and-dump schemes target thinly traded Stocks: owning a slice of a companyFact, law or data
The connection
Penny stocks trading over the counter have few shares changing hands and little public information, so modest buying moves the price. Promoters exploit that: they buy, publish glowing tips, and sell as followers bid it up. It rarely works with large, heavily traded stocks, because moving them takes too much money.
When and why
Long Island boiler rooms in the 1980s–90s, spam emails in the 2000s, and social media and tiny Nasdaq listings since 2020.
How we know
SEC trading suspensions and enforcement cases, plus SEC and FINRA investor alerts describing the pattern.
Debates and risks
Whether tighter disclosure rules for over-the-counter stocks, in force since 2021, and stricter listing standards actually cut losses is not yet clear.