Sixteen documented typos and fat-finger errors that each cost more than $1 million

Asked:

“Every typo or fat-finger error that cost more than $1M — what was typed, what it cost”

A broad live-web scan found 16 documented incidents from 1872 through 2026 that clear the $1 million threshold on reported realized loss, damages, regulatory fines tied to the event, or an explicitly reported unrecovered balance. Costs mix historical and current USD, GBP, EUR, JPY, KRW, NOK and AUD, and are not inflation-adjusted — so the page orders by year, not by a cross-currency ranking.

154 years of expensive keystrokes

Red is what was typed · blue is what it cost · hover a row to focus it

What the timeline cannot say alone

The literal order-entry blunders dominate the modern era: Mizuho typed sell 610,000 shares at ¥1 instead of 1 share at ¥610,000 (about $225m), Citigroup typed $444bn instead of $58m ($48m loss plus £61.6m UK fines), and BNP priced a certificate at €108 instead of €54,400 (about €160m). ruinmyweek.com, linkedin.com, wikiwand.com

Gross accidental transfers are not counted as cost. Bithumb distributed 620,000 BTC by picking the wrong reward unit, but the row carries only the roughly $9m still unrecovered as of February 2026; Crypto.com is shown at its reported unrecovered balance snapshot (A$5.57m of A$10.47m sent). cryptowisser.com, htx.com

Mariner 1’s famous “missing hyphen” is better sourced as an equation transcribed without its overbar; the causation retelling is disputed and the row is marked medium confidence. ruinmyweek.com

Not every fat finger is a number: Norway’s sovereign-wealth fund typed December 1 instead of November 1 and booked a NOK 900 million loss, and Companies House liquidated the wrong company by one letter — “Taylor & Sons” for “Taylor & Son” — for £8.8m in damages. mein-mmo.de, ruinmyweek.com

All 16 incidents

Documented set found by a broad live-web scan as of 2026-08-31 — all qualifying cases found, not a provably exhaustive census of every private or unreported mistake. 16 rows, one per incident, 1872–2026, deduplicated and chronologically ordered. A cost is the reported realized loss, damages, regulatory fines tied to the event, or an explicitly reported unrecovered balance; currencies are as reported and not inflation-adjusted. Excluded: lawsuit demands rather than awarded/realized cost, hypothetical exposure, software bugs without a literal human entry error, and errors caught and fully reversed. The 1978 Prudential row has no surviving source URL in the shaped set. Old or thinly corroborated rows are marked medium confidence.

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