GBL had taken an initial 3 percent stake in March.
The Milan-based group is in the midst of a reorganization and streamlining of its brands, which dented its revenues last year.
Issues abound with the new administration and retailers are paying for a voice.
As demand for second-hand luxury goods rises, so does the number of outlets selling them.
Comisar’s new firm Scope Capital Partners + Advisors is a private equity firm and merchant bank.