KPMG LLP plans to take legal action against Scott London, its ex-partner accused of insider trading, said John Veihmeyer, the Big Four accounting firm's chairman and chief executive.

The firm intends to bring the action "in the near future," Mr. Veihmeyer said in a statement issued Thursday night. He didn't elaborate.

Mr. Veihmeyer said he was "appalled" when he reviewed the criminal complaint federal investigators filed Thursday against Mr. London, with previously undisclosed details about his conduct. Authorities charged Mr. London with providing tips on five KPMG clients to a friend, Bryan Shaw, who used the information to make more than $1 million in trading profits. Both men have admitted wrongdoing, and Mr. London has said KPMG wasn't involved in his actions.

"We unequivocally condemn his actions, and deeply regret the impact that his violations of trust and the law have had on our clients and our people," Mr. Veihmeyer said.

Mr. Veihmeyer's statements were his first public comments on the matter since KPMG disclosed Monday evening that it had fired one of its partners, later identified as Mr. London, after he had provided inside information about KPMG clients. The firm quickly fired Mr. London, a partner in charge of its audit practice in its Los Angeles office, and resigned as auditor of two clients for which Mr. London served as lead partner, Herbalife Ltd. (HLF) and Skechers USA Inc. (SKX).

Mr. Veihmeyer said KPMG resigned from those two clients because "it was clear that our independence had been impaired" with respect to them. He reiterated, as KPMG has said previously, that he had "no reason to believe" there were any misstatements on either firm's financial statements.

Write to Michael Rapoport at michael.rapoport@wsj.com

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