Swiss Bank Whistle-Blowers Said Handed Client Data to U.K

Whistle-blowers at two Swiss banks have handed over client account data to U.K. tax authorities, according to two people with knowledge of the matter.

The authorities are examining the data before writing to U.K.-resident account holders and sharing the information with other countries, said the people, who declined to be named because the matter is confidential. At least one of the banks is foreign-owned and has clients spanning more than 100 jurisdictions, they said.