is it company's fault that the some groups are underrepresented as their employees? Cant talk for all companies but in my experience females are underrepresent

is it company's fault that the some groups are underrepresented as their employees? Cant talk for all companies but in my experience females are underrepresented simply because we dont really get any female applicants. If there is a racism/sexism within the sector it happens before the job application and I find it hard to blame companies for that. If anything I know some examples of people getting advantage during the hiring because of their race.