SoftBank Group Corp. urged a U.S. judge to block Credit Suisse Group AG from conducting a "fishing expedition” in a simmering dispute over the collapse of Greensill Capital.

Zurich-based Credit Suisse is seeking internal records from SoftBank as it prepares to file a lawsuit in England to recover losses from last year’s implosion of financier Lex Greensill’s supply-chain finance empire.

The Tokyo-based holding company said in a filing late Friday in San Francisco federal court that a subpoena prepared by the Swiss bank is nothing more than a "desperate” attempt to deflect responsibility for the "embarrassing” loss of hundreds of millions of dollars in the Greensill collapse.