A stranger in a group chat posts a ticker you have never heard of, with a chart and a reason it is about to run. The price is already climbing, which makes the claim look true. On the other side of that move, the person who posted it is selling. Here is how the setup works, and why the last buyer matters.
The Promotion Is the Trade
A pump and dump has three steps. First, someone quietly buys a large position in a stock that almost nobody trades. Second, they manufacture buying interest with a post, a video, a newsletter, or a paid alert service. Third, they sell their shares into the buyers that interest produced.
The tip is the trade. The promoter's profit has nothing to do with the company doing well. It comes from you placing an order while they still have shares to unload. You are not the audience for the pitch. You are the buyer it needs.
Why It Only Works on a Small Stock
Two numbers decide whether a stock can be pushed around this way.
The first is float, meaning the shares actually available to trade. A company might have 50 million shares outstanding, but if insiders hold 47 million and never sell, only 3 million can really be bought. The second is average daily volume, the shares that changed hands on a normal day. Volume looks backward. It counts trades already done, not the sellers waiting at today's price, but it is a fair proxy for them.
Now the arithmetic. Picture a stock at $2 that trades 20,000 shares a day, so about $40,000 changes hands. A promotion brings in 200 people who each spend $500. That is $100,000 of buying, two and a half times a normal day. There are not enough sellers near $2 to fill it. Buyers take every offer at $2.10, then $2.40, then $3. The price is 50% higher, and $100,000 did it.
Send that same $100,000 into a company that trades $2 billion of stock a day. It is one twenty-thousandth of the volume. The price does not notice.
Where the Pitch Reaches You Now
The boiler room full of phones still exists, but regulators' current warnings are aimed elsewhere. Promotion arrives four ways.
Social posts and short videos, where a chart beats a balance sheet.
Private chat groups and paid alert services that name an entry price and a time to buy.
Email and newsletter campaigns, descended from the 1990s fax blast.
Paid promotion by an investor relations firm the company or a shareholder hired.
Paid promotion has carried a disclosure duty since 1933. Anyone paid by a company, its underwriter or a dealer to publish something about that security has to disclose the payment and its amount, inside the promotional material itself. Naming who paid comes from SEC investor guidance rather than from the statute.
The uncomfortable part is that the disclosure usually exists. It sits in grey type at the bottom of the page, or in the last four seconds of a video. The rule assumes a reader who reads fine print, and the business model assumes one who does not.
Skip it entirely and regulators bring a touting case. In 2018 the SEC settled charges against Floyd Mayweather Jr. and DJ Khaled for promoting coin offerings without revealing they had been paid $100,000 and $50,000 by a single issuer. Neither admitted nor denied the findings, and the charge was the undisclosed payment, not the offerings.
Three Shapes the Same Scheme Takes
The shell. A company with no real business gets a story attached to it. Often the vehicle is a reverse merger, where a private business takes over a dormant shell quoted over the counter and inherits its ticker without a public offering. Reverse mergers are legal and often ordinary. A rule adopted in 2020 and in force since September 2021 generally stops a broker from publishing quotes for a company that does not keep current information available. More than 2,000 securities moved to a restricted tier when it applied, and the SEC proposed changes to the rule in March 2026.
Short and distort. The mirror image. Take a short position, publish something alarming and false, then buy back cheaper. Short selling itself is legitimate and has its own article here. The fraud is the false claim, not the direction of the bet.
The crypto version. A token has a float too, but nothing forces the creator to disclose it or to wait: no registration statement, no insider lockup, no holding period, no reporting. Whoever creates it can keep nearly all of the supply, put a thin slice into a trading pool, promote it, and sell into whoever shows up.
You Cannot Trade It, Even If You Are Right
Suppose you spot a pump early and plan to get out before the dump. It does not work, and the reason is structural.
The promoter knows the schedule. They know when the emails go out, how many, and when they stop. You know none of it. The top is the moment they finish selling, and they pick it.
A 2007 study filtered 1.8 million spam emails, sent between 2000 and 2005, down to about 75,000 stock touts and measured both sides. Someone who bought on the heaviest day of touting and sold two days after the campaign ended lost about 5.5%, before trading costs. The spammer, buying the day before the campaign began and selling on its busiest day, made about 4.29%. Same stock, same week, opposite outcomes. The difference was the calendar. The channels have changed since. That advantage has not.
The exit is not fully yours either. A promoted stock can have almost no bid left once the selling starts. The SEC can also suspend trading in a security for up to ten business days, and it uses that power on suspicious microcaps.
Four Checks Before You Act on a Tip
Ask who is telling you and what they hold. A promoter with a position is not handing you information, they are recruiting a buyer. If nobody will say, treat the silence as the answer.
Check when the volume moved. Pull up a price chart with volume for the past few months. If both jumped before any news appeared, someone was buying before the story existed. Real interest follows a filing or a product. Engineered interest arrives first.
Check whether the company files real reports. EDGAR, the SEC's filing database at sec.gov/edgar, holds what reporting companies submit. Plenty of microcaps do not report to the SEC at all, so an empty search is a reason to dig rather than proof of anything. Nothing online but promotional material is its own answer.
Check the person, if they claim credentials. BrokerCheck, free from FINRA at brokercheck.finra.org, covers brokers and firms registered now or in the last ten years, with complaints and regulatory actions. Most promoters were never registered, so no record means unregistered, not cleared.
All four take about ten minutes, which is ten minutes longer than a pump is built to give you.
If a pitch fails them, the SEC takes tips at sec.gov/tcr. Reporting one you saw through still helps, because the case against a promoter is built from people who did not buy as much as from people who did.
A Fast Rally Is Not Proof of Anything
Real companies do go up quickly. A small drug developer posts a trial result, or a beaten-down stock recovers because the fear was overdone. A stock doubling is not evidence of a crime.
The signal is never the move by itself. It is the combination: little business behind the company, a price that moved before any verifiable news, and a promoter with a position telling you to buy today. Together they describe somebody else's exit.
Calling every rally a scam has a cost too, paid quietly in the good investments you talked yourself out of.
