A Rowayton-based investment firm has countersued a former senior analyst for breach of contract, for allegedly stealing confidential trade secrets and refusing to return them.

According to the lawsuit, former analyst Steven Bongiovanni admitted under oath during a Sept. 27 deposition with counsel for Graham Capital Management that he had secretly recorded meetings where discussions of confidential company proprietary trading systems and models took place. The lawsuit maintains Bongiovanni admitted to having in his possession at least five recordings of meetings with company personnel, including three research department discussions. Bongiovanni, the suit contends, also testified he might also have recordings of other company meetings on backup drives in his homes in Vermont and Connecticut.