Women Vastly Underrepresented In Silicon Valley Tech Jobs
What most of the mentioned diversity reports have in common is the fact that they break down the workforce into tech and non-tech jobs. For non-tech jobs, the male to female ratio roughly mirrors that of the U.S. labor force as a whole for most companies. Looking at tech jobs (programmers, engineers, etc.) yields an entirely different result: women account for less than one in five tech jobs at six of the world's most renowned tech companies, including Apple, Google and Facebook.

Description
This chart shows the percentage of female employees in the workforce of selected American tech companies.