The push for gender diversity on public companies' boards has been gaining traction. Advocacy groups, institutional investors, regulators and companies themselves have all recognized the need for more diverse boards. However, gender parity is still absent from most public companies' boards, and...

Four-fifths of the corporate board seats in the United States are held by men and a shocking number of companies lack any female representation on their boards. While institutional investors have pushed these companies for change, California took a more aggressive step and followed several...