Pump and Dump

Stock trading dictionary: meaning, example and how traders use it.

Last updated: October 17, 2026

Definition: A pump and dump is a form of securities fraud in which promoters hype a thinly traded stock with misleading claims to drive the price up, then sell their shares to the buyers they attracted, leaving them with losses.

How a pump and dump works

The scheme has three stages. First, the promoters quietly accumulate shares of a low-priced, illiquid company, often among OTC stocks or pink sheet stocks where public information is limited. Second, they pump the stock with aggressive promotion: newsletters, social media posts, chat groups, spam emails, or fake press releases claiming a breakthrough, a buyout, or a major contract.

Third, as new buyers push the price and volume sharply higher, the insiders dump their holdings. Once the selling starts and promotion stops, the price usually collapses, often below where it began. Because these stocks have low liquidity, late buyers may struggle to sell at any reasonable price.

Pump and dump example

Suppose a promoter group buys 2 million shares of a little-known company at $0.10. They then circulate posts claiming the firm is about to sign a deal with a large technology company. Retail buyers rush in and the price climbs to $0.60 in a week. The group sells its 2 million shares near $0.50, collecting about $1 million on a $200,000 outlay. No deal exists, the hype fades, and within days the stock trades at $0.08. Investors who bought near the top lose most of their money.

Warning signs of a pump and dump

  • Unsolicited tips urging you to buy immediately before the price "explodes."
  • A sudden spike in price and volume without a filing or verifiable news.
  • Very low share price and small market capitalization.
  • Little or no revenue, audited financials, or a credible annual report.
  • Promoters who are paid to tout the stock, sometimes disclosed only in fine print.

Checking a company's SEC filings and comparing the promotion with its actual fundamentals is a practical first defense.

How to protect yourself from a pump and dump

Treat any unsolicited stock tip with skepticism, especially one that arrives through social media, messaging apps, or email from strangers. Look up the company's filings on the SEC's EDGAR database and confirm that the news being promoted actually appears there. Be cautious with stocks whose trading has been halted or suspended in the past, and check whether the promoter discloses being paid. If you are unsure, it is usually safer to skip the trade. Suspected manipulation can be reported to the SEC or FINRA.

Pump and dump schemes are illegal market manipulation under US securities laws, and the SEC and Justice Department bring enforcement actions against organizers. That does not help victims much, since recovered funds are often limited. The scheme is one of the clearer examples of investment risk created by fraud rather than market forces. Related tactics include "short and distort," where traders spread false negative rumors to profit from short positions.

Frequently asked questions

Is a pump and dump illegal?

Yes. Spreading false or misleading information to inflate a stock's price and then selling into the buying is securities fraud and market manipulation under US law.

How can you spot a pump and dump?

Common red flags include unsolicited buy recommendations, urgent language, sharp price and volume spikes without verifiable news, very low-priced illiquid shares, and companies with little financial disclosure.

Can you get your money back from a pump and dump?

Sometimes regulators recover funds and distribute them to victims, but recovery is often partial or nonexistent. Reporting suspected fraud to the SEC is still worthwhile.

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For information only, not investment advice. See the disclaimer.