The largest frauds in history by amount

The largest fraud in history by amount is Bernie Madoff's, if you measure what his victims lost: about $17.5 billion in principal, roughly $26.2 billion in 2025 dollars, while his fake statements added up to $64.8 billion. The great accounting frauds, such as Enron (2001) or WorldCom (2002), involved even bigger numbers, but they measure something else: inflated market or book value, not money anyone walked away with. Here are 23 cases with the original figure, the year, the source and, where it can be calculated, the equivalent in 2025 dollars.

The largest frauds in dollars, adjusted to 2025

Ranked by their equivalent in 2025 dollars. The “What it measures” column matters as much as the number: the money investors put in is not the same as an accounting hole or the amount claimed in a lawsuit.

Madoff is listed by principal lost. If you take his clients' paper balances, $64.8 billion, the equivalent in 2025 dollars would be about $96.9 billion, but that number includes profits that never existed.

The largest frauds in other currencies (unadjusted)

These cases are measured in euros or rupees. We don't convert them to 2025 dollars because that would mean mixing exchange rates with another country's inflation, and the result would be less reliable than the original figure.

The great frauds before 1913

The US price index starts in 1913, so these figures are given as they appear in the sources, unadjusted. Nor are they comparable with each other: two of them are stock bubbles, where the money lost is measured by how far the share price fell.

How we built this ranking (methodology)

This ranking is a reference tool, and every number has to be checkable. These are the rules:

1. Which cases are included. Only frauds with a criminal conviction, a confession by the person responsible or a formal fraud charge; the legal outcome appears in every row. Bankruptcies that were not prosecuted as fraud, such as Lehman Brothers in 2008, are left out, and so are modern bubbles without proven fraud.
2. Which figure we use. The one from the strongest source we found: court rulings and official statements (the US Department of Justice and the SEC, Spanish courts) and, failing that, quality press. We always say what it measures: money raised, principal lost, accounting hole or amount claimed. When there are two figures, we give the more conservative one and mention the other.
3. How we adjust. Dollar figures have been adjusted with the US CPI (BLS); for figures before 1913, the original figure is given unadjusted. We use the Consumer Price Index for All Urban Consumers (series CUUR0000SA0). The formula is: figure × 2025 average CPI ÷ average CPI of the year of the figure.
4. Which year we take. The year the fraud came to light, which is when the figure was fixed. For Madoff, 2008; for Enron, 2001; for FTX, 2022.
5. The 2025 CPI. It is the average of the months published by the BLS: 321.943. The October 2025 figure was not published, so the average covers eleven months.
6. Rounding. Results are rounded to the nearest hundred million (or to the nearest ten million for small figures). They are approximations: the CPI measures consumer prices, not what an investment would be worth today.

The factors we applied, in case you want to repeat the calculation:

What does the ranking say about how scams work?

That size depends on the disguise, not the mechanism. The biggest numbers don't belong to the cleverest con artists, but to those who had access to the most money belonging to other people, with nobody checking: a prestigious Wall Street firm (Madoff), a large listed company with auditors (Enron), an offshore bank that looked safe (Stanford) or a crypto exchange holding its customers' money (FTX).

Three lessons repeat from top to bottom:

• The bigger it is, the longer it lasted. Madoff ran for at least two decades; Fórum and Afinsa, for more than twenty years. A fraud doesn't reach billions in months: it gets there because for years nobody looks.
• New money pays the old. From Ponzi to Madoff, from Petters to OneCoin, more than half the table are Ponzi or pyramid schemes. We explain how they work in what is a Ponzi scheme.
• If the numbers always add up, someone is making them add up. That is Enron's Law of Deception, and it holds for WorldCom, Parmalat, Satyam and Wirecard. You'll find them all in The Laws of Deception.

How not to end up in the next row

None of these victims thought they were in a scam. Before you invest, check that the firm and the person are registered: in the US, on FINRA BrokerCheck and on the SEC's Investor.gov; in the UK, on the FCA Register and the FCA Warning List. Insist that your money is held in your name by an independent custodian, and be wary of any return that never misses. You'll find the full list in how to spot a scam, the American cases in the biggest financial frauds in US history and the list by fame, not by money, in the biggest scams in history.