Sullivan & Cromwell and Weil, Gotshal & Manges topped the list with all-female U.S. partner promotions. On the flip side, 14 firms nationally had all-male U.S. classes, including Cleary Gottlieb Steen & Hamilton and Milbank, Tweed, Hadley & McCloy.

“The increase in the number of women promoted to partner is heartening,” Cynthia Thomas Calvert, the group’s director of research, said in a statement. But she added that “celebration would be premature.” Women overall make up only about one fifth of firm partnerships, she said. And the survey, she noted, made no distinction between equity and non-equity partners.