I compiled detailed employment data on 283 U.S. and European private investment firms, primarily by studying their websites and other public information. I counted up male and female employees, determined the number of men and women in each function, and looked at each person’s title to determine his or her role. The proportion of women firmwide ranged from 17% to 23%, and they were overwhelmingly found in marketing, HR, and other support functions. Almost 60% of the firms I studied had no female senior investment professionals at all.