Six of the group’s restaurants, in Las Vegas and East Asia, closed soon afterward, when the Sands casino group ended its contracts with Batali & Bastianich. Others shuttered as the process of dismantling the partnership dragged on. The group’s newest restaurant, the ambitious and expensive La Sirena, in the meatpacking district of Manhattan, closed in December.

Since the scandal began, Mr. Bastianich has insisted that he was unaware of Mr. Batali’s sexual aggressions against women. In a statement on Tuesday, he said: “While I never saw or heard of Mario groping an employee, I heard him say inappropriate things to our employees. Though I criticized him for it from time to time, I should have done more. I neglected my responsibilities as I turned my attention away from the restaurants. People were hurt, and for this I am deeply sorry.”

But three former employees of the restaurant group, who spoke on the condition of anonymity because of Mr. Bastianich’s power in the restaurant business, said that they believed it was not possible that Mr. Bastianich remained ignorant of serious misbehavior by Mr. Batali. Throughout the industry, they and others have said, both men were known for fostering a sexist, raucous culture that ignored misconduct by male employees and demeaned female workers. (Before the #MeToo movement, however, that kind of atmosphere was hardly unique to Batali & Bastianich.)

Mr. Batali issued a statement on Wednesday morning: “I have reached an agreement with Joe and no longer have any stake in the restaurants we built together. I wish him the best of luck in the future.” He declined requests for further comment.

Batali & Bastianich was not a holding company and had no ownership; it provided management services to all the restaurants in the group. Each restaurant was, and will remain, independently operated and financed by multiple parties.

As a result, Mr. Batali, 58, was never involved in Felidia or the Lidia’s restaurants, in Pittsburgh and Kansas City. Ms. Silverton, 64, is involved only in the group’s five California restaurants: Chi Spacca, Osteria Mozza and three variations on the Mozza theme. At Becco, which Mr. Bastianich opened in New York’s theater district in 1992 after a short career as a bond trader, his grandmother, Erminia, is an investor. (She is now 101 years old, and has recouped her initial stake.)

Although Mrs. Bastianich Manuali, who will run the newly created group, has never had a public role in Batali & Bastianich, she has long managed their mother’s restaurants. She also co-wrote seven of her mother’s cookbooks and has been a producer on her television series since 2006.