Quick answer
Common scams include Ponzi and pyramid schemes, pump-and-dumps, affinity fraud and impersonation. The shared red flags: promises of guaranteed or risk-free returns, pressure to act fast, unregistered sellers, and requests to pay by credit card, gift card or a wire abroad or to a personal account [1] [2].
Key points
- A Ponzi scheme pays earlier investors with money from new investors instead of real investment returns.
- Pyramid schemes earn mainly from recruiting new members, not from selling a genuine product.
- Pump-and-dump promoters hype a stock with false claims, sell their own shares, and leave others holding the loss.
- Affinity and impersonation scams borrow trust — from a shared group, or from a real firm or regulator.
- Any claim of high returns with little or no risk is a red flag: every investment can lose money.
#What do most investment scams have in common?
Investment fraud "comes in many forms", as Investor.gov puts it [3], but the pitch is usually built from the same parts: a return that sounds unusually high, a claim that there is little or no risk, a reason you must act now, and a seller who is not registered. The Federal Trade Commission (FTC) is direct about the risk claim: "All investments come with the risk that you'll lose money" [2].
The SEC's checklist of red flags adds a few more patterns to recognise [1]. Seeing one of them does not prove fraud, but seeing several together is a strong reason to stop and check.
| Red flag | Illustrative pitch (made-up example) |
|---|---|
| Unlicensed investment professionals | Claims a licence is not needed for this kind of deal |
| Offers that sound too good to be true | Our members earn 4% a month, every month. |
| "Risk-free" opportunities and guaranteed-return claims | Your principal is fully protected and the return is locked in. |
| "Everyone is buying it" pitches | Thousands of people in our group already joined. |
| Pressure to invest right now | The window closes tonight. |
| Sensational pitches, possibly with fake testimonials | Screenshots of big gains and glowing reviews |
| Unsolicited requests for personal information | A stranger asks for your account number or ID |
| Unusual payment methods | Pay by credit card, gift card, or a wire abroad or to a personal account |
#How does a Ponzi scheme work?
Investor.gov defines it simply: "A Ponzi scheme is an investment fraud that pays existing investors with funds collected from new investors" [4]. The organizers usually promise high returns with little risk, but they do not invest the money; they use it to pay earlier investors and may keep some for themselves [4]. Early investors receive real payments, which makes the scheme look legitimate and encourages them to bring in friends.
Its red flags include returns that are "overly consistent" regardless of market conditions, unregistered investments, unlicensed sellers, secretive strategies, errors in account statements, and difficulty cashing out [4]. Real investments move up and down; a line of returns that never dips is itself a warning.
Worked example
Why a Ponzi scheme runs out of money
A promoter claims to pay 4% a month. Over 12 months, new investors deposit $50,000, $40,000, $30,000, $20,000 and $10,000 in the first five months, then nothing. The promoter invests nothing, keeps 20% of every deposit, and pays each month's 4% from the cash on hand.
- Total deposited (principal owed back)
- $150,000
- Promoter's cut (20% × $150,000)
- $30,000
- "Returns" paid out over 12 months
- $64,000
- Cash left after month 12 ($150,000 − $30,000 − $64,000)
- $56,000
- Shortfall if everyone asked for principal ($150,000 − $56,000)
- $94,000
- Cash per $1 of principal ($56,000 ÷ $150,000)
- about $0.37
Investors who saw steady 4% payments believed they were winning. In fact the money was shrinking every month, and only about 37 cents of each dollar remained once new deposits stopped.
Hypothetical scheme for illustration, simulated month by month in Python. A promised 4% a month would compound to roughly 60% a year — a figure that should itself raise questions.
Cash left in the hypothetical scheme vs money owed
#How is a pyramid scheme different?
In a classic pyramid scheme, according to Investor.gov, participants try to make money "solely by recruiting new participants", usually with a promise of high returns in a short time, no genuine product or service, and heavy emphasis on recruiting [5]. Warning signs include easy-money or passive-income promises, no demonstrated revenue from retail sales, and complex commission structures [5].
The math cannot last, because each level needs more recruits than the one above it. Investor.gov's verdict: "All pyramid schemes eventually collapse, and most investors lose their money" [5].
#What is a pump-and-dump?
A pump-and-dump has two parts. First, promoters "try to boost the price of a stock with false or misleading statements about the company" [6]. Then they sell their own shares into the rising price. When the promotion stops, "the price typically falls, and investors lose their money" [6]. Investor.gov warns about unsolicited online messages urging you to buy quickly because of supposed "inside" information [6]. Sharp moves on hype alone are a form of risk worth understanding — see market volatility.
The pump-and-dump cycle
#Why do affinity and impersonation scams work so well?
Both borrow trust that the fraudster did not earn. Affinity fraud targets members of identifiable groups, such as religious or military communities or older investors, and exploits "the trust and friendship that exists in groups of people" [7]. Investor.gov's advice: "Even if you know the person making the investment offer, be sure to research the person's background" [7].
Impersonation schemes copy a trusted name — a government agency, the SEC itself, or a real broker or adviser [8]. Investor.gov advises contacting a professional through the details on their Form CRS, found with its search tool, rather than through the unsolicited message [8]. Our step-by-step guide to checking a broker shows how.
The CFTC, the US regulator for futures and related markets, reports that these "financial romance and grooming" groups stole more than $3.5 billion in 2023 [9]. One of the CFTC's six warning signs is that you "make a lot of money quickly or easily" after following their directions [9] — the gains on screen are bait to get you to deposit more.
#What should you do if you spot a red flag?
Slow down and verify before sending anything. Check that the person is registered, ask for details in writing — Investor.gov warns that fraudsters often avoid putting things in writing [7] — and never pay by gift card or by wiring money to a personal account. If you think you have been targeted, the FTC asks people to report investment fraud at ReportFraud.ftc.gov, and also lists the SEC (sec.gov/tcr) and the CFTC as places to report [2].
Common beginner mistakes
Trusting early payouts
In a Ponzi scheme, early investors really are paid — with other people's money. A few successful withdrawals prove nothing about where returns come from.
Skipping checks because a friend vouched
Affinity fraud spreads through people who sincerely believe in it. Research the seller and the investment yourself.
Acting on an urgent tip
Pressure to buy before a deadline, or because of "inside" news, is a classic pump-and-dump and fraud tactic. Real opportunities survive a day of research.
Paying in ways you cannot reverse
Gift cards, crypto transfers and wires to personal accounts are hard to recover. A request to pay this way is itself a red flag.
What's the bottom line?
Investment scams change their costumes — crypto platforms, social media groups, fake regulators — but the underlying patterns repeat: unusually high or steady returns, claims of no risk, urgency, unregistered sellers and odd payment requests. Knowing those patterns, and checking every seller through official databases, removes most of a fraudster's advantage. If a legitimate firm fails, a different safety net may apply: see what SIPC protection covers.
Frequently asked questions
Is any investment truly risk-free?
No. The FTC states that all investments come with the risk that you will lose money. Regulators treat a pitch that claims high returns with little or no risk as a red flag, because higher returns typically come with more risk.
What is the difference between a Ponzi scheme and a pyramid scheme?
In a Ponzi scheme, a central organizer takes money and pays earlier investors from new deposits, often without investors needing to recruit. In a pyramid scheme, participants make money mainly by recruiting new members, who pay to join.
Where can I report a suspected investment scam in the US?
The FTC accepts reports at ReportFraud.ftc.gov, the SEC takes tips at sec.gov/tcr, and the CFTC accepts complaints about commodities-related fraud. Your state securities regulator can also help.
Can a scammer fake a real company's identity?
Yes. Impersonation schemes copy the names of real firms, professionals and even the SEC. Always contact a firm using details you looked up yourself, such as those on its Form CRS or official website.
Sources
Grade A = primary source (regulator, government agency, official rulebook or the index provider's own documents). Numbers in brackets in the text point here.
- U.S. SEC — Investor.gov. Red Flags of Investment Fraud Checklist (2026). Accessed 2026-10-03.A
- U.S. Federal Trade Commission. Investment Scams (2026). Accessed 2026-10-03.A
- U.S. SEC — Investor.gov. Types of Fraud (2026). Accessed 2026-10-03.A
- U.S. SEC — Investor.gov. Ponzi Scheme (2026). Accessed 2026-10-03.A
- U.S. SEC — Investor.gov. Pyramid Schemes (2026). Accessed 2026-10-03.A
- U.S. SEC — Investor.gov. Pump and Dump Schemes (2026). Accessed 2026-10-03.A
- U.S. SEC — Investor.gov. Investment Scams Targeting Groups (2026). Accessed 2026-10-03.A
- U.S. SEC — Investor.gov. Impersonation Schemes (2026). Accessed 2026-10-03.A
- U.S. Commodity Futures Trading Commission. Customer Advisory: Six Warning Signs of Online Financial Romance Frauds (2026). Accessed 2026-10-03.A
This page is general education, not personal financial, tax or legal advice. Figures in worked examples are hypothetical and calculated before taxes and fees unless stated. Rules and limits change; check the linked primary sources for the current version. How we check every page.
