LONDON—A jury here convicted Tom Hayes, a former trader at UBS AG and Citigroup Inc., with fraudulently trying to rig the London interbank offered rate, or Libor, the first criminal conviction of an individual for manipulating the widely used benchmark.

Mr. Hayes, a mildly autistic mathematician whose quirky personality earned him the nickname "Rain Man" among bank colleagues, faces a jail sentence of potentially more than 10 years. A judge will sentence him at a later date.

Mr. Hayes, a 35-year-old Briton who worked in Tokyo during the period of his crimes, was charged in June 2013 with eight counts of conspiracy to defraud. He was convicted on all of those counts.

The conviction is a major victory for the U.K.'s Serious Fraud Office, which brought the case and whose director has described the Libor prosecutions as the agency's top priority. It also represents a symbolic win for authorities elsewhere in the world that have spent as much as seven years investigating the manipulation of Libor.

Write to David Enrich at david.enrich@wsj.com

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