Roberto de Guardiola, a well-known investment banker in the mutual fund industry, has left Putnam, Lovell, de Guardiola & Thornton of San Francisco to form his own firm.

The new firm, de Guardiola Advisors of New York, is already in business, de Guardiola said in an interview April 7. The firm will concentrate on investment banking in the asset management business, de Guardiola said.

De Guardiola resigned from Putnam Lovell April 3. Putnam Lovell has gradually broadened its business in the past year, de Guardiola said. He preferred to concentrate on transactions in the asset management industry, he said.

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