(名詞) 錯誤的交易或疏忽造成的交易，尤指打字錯誤造成的對市場有重大影響的交易。亦寫成 fat finger, fat-finger trade, fat fingers trade。
Gold futures ended nearly unchanged Monday, after a large early-morning sell order roiled traders and slashed prices by almost $15...Gold traders buzzed with speculation that the transaction was an input error — a so-called "fat finger" trade...One indicator that the transaction was a mistake was its size. At 750,000 troy ounces, such large trades are rarely conducted amid very thin trading volumes.
—Tatyana Shumsky, "Gold Shakes Off $1.24 Billion 'Fat Finger'," The Wall Street Journal MarketBeat, April 30, 2012
A trader at RBS has admitted to making a fat finger trade in the EUR/CHF pair Monday, a spokesperson for the bank told Reuters...Initial reports had claimed that it was RBS's algorithms that caused the spike. However, those reports were later proven wrong. It turns out that it was a simple fat finger trade that caused the spike and algos reacted to send the pair even higher.
—Matthew Kanterman, "Another Day, Another Trading Glitch: RBS Admits Responsibility in EUR/CHF Spike," Benzinga, August 9, 2012