In a surprise move, UBS AG (NYSE: UBS) said today that it would end off-shore banking and security services in the U.S.

The decision was disclosed today by Mark Branson, the chief financial officer for UBS Global Wealth Management and Business Banking during testimony before a U.S. Senate hearing on tax havens. According to Bloomberg News, the U.S. Senate Permanent Subcommittee on investigations found that UBS bankers from Switzerland -- who were not licensed in the U.S. -- frequently traveled here to woo wealthy Americans interested in setting up secret Swiss bank accounts or shell companies in tax havens such as the British Virgin Islands.

UBS, Switzerland's largest bank, has estimated 19,000 Swiss accounts for U.S. clients with assets valued at $18 billion, according to the subcommittee's report. Along with LGT Bank of Lichtenstein, UBS allowed U.S. clients who sold their U.S. securities to continue to hold undisclosed accounts and to open accounts in the name of non-US entities that were owned by U.S. clients.