The Anita Borg Institute writes:
Women are underrepresented in computing-related professions, where teams are predominantly male. Yet women offer considerable skills and technical abilities that companies can ill afford to ignore in today's tight talent market. Companies willing to create more diverse teams and foster a supportive culture that extends to senior management will stand out - allowing them to attract higher-quality talent.
Organization that have demonstrated a commitment to gender diversity should also experience an increased ability to retain technical talent. In addition to improving company image, capital markets and investors are increasingly evaluating corporate performance in the area of gender diversity.
Research time and again has agreed with this. The whole paper is packed with great data and takeaways.