It is difficult to say what percentage of the tech industry is women because there is no clear definition of what constitutes the tech industry. Generally speaking, the tech industry includes companies that develop and commercialize technology, as well as companies that use technology to provide services or manufacture products.
There are a number of surveys and reports that have attempted to estimate the percentage of women working in the tech industry, but the results vary widely. A survey conducted by the US Bureau of Labor Statistics in 2015 found that 26% of workers in the computer and mathematical occupations were women. However, a report from the National Center for Women & Information Technology found that, in 2016, only 26% of professional computing jobs were held by women.
It is clear that the tech industry has a gender diversity problem. While the exact percentage of women working in tech is difficult to determine, it is clear that women are underrepresented in the industry. There are a number of initiatives aimed at increasing the number of women in tech, such as programs that provide training and mentorship for women interested in careers in tech.