All his life, Bob Weinstein toiled in the shadow of his larger-than-life older sibling, Harvey Weinstein.

Coming across more like an introverted accountant than a Hollywood movie mogul, Bob Weinstein has publicly insisted over the years that he never wanted the attention, and did not mind being the lesser-known brother even though he was a co-founder of Miramax and the Weinstein Company and shepherded smash hits like “Scream” and “Scary Movie.” He once joked that there was not “physically room” in the spotlight for both Weinsteins anyway.

Bob Weinstein, 63, is now scrambling to save the Weinstein Company, which is a shambles amid allegations of sexual harassment and rape against Harvey Weinstein going back decades. With his brother fired and creative partners fleeing, Bob Weinstein first tried to prevent a sale, publicly insisting that “business is continuing as usual” and telling agents and filmmakers about ideas to rename the studio and bring women onto its board. In recent days, the plan shifted, with the investment firm Colony Capital negotiating to buy some or all of the studio.

The Weinstein Company and Colony agreed on a limited window to make a deal. If no agreement is reached and no deal with another buyer materializes, bankruptcy and liquidation could loom. “He’s working very hard to hold the company together, stabilize the company, protect the employees, protect his shareholders,” David Boies, a lawyer who represents the studio, said of Mr. Weinstein.