ZURICH—A parliamentary report that sharply criticised the Swiss government's handling of the financial crisis isn't likely to sway lawmakers ahead of a vote on a settlement with the US to hand over account details on 4,450 wealthy clients of the Swiss bank suspected of using hidden Swiss offshore accounts to avoid taxes, Swiss banking giant UBS AG said.

The parliamentary report, released Monday, criticised the government's lack of direction as UBS's losses mushroomed over souring mortgage-related securities and as pressure from US tax officials on Switzerland as a financial centre rose, prompting wealth clients to yank money from UBS.