When CNN investigated Silicon Valley technology companies’ diversity problem, most of the major technology companies refused to share employee data.

CNN asked 20 companies for data on the male, female, and racial demographics. At first only three agreed to reveal them. After  filing two FOIA requests, CNN was able to get five companies to comply.

They were: Cisco, Dell, eBay, Ingram Micro, and Intel.

But Apple, Google, Hewlett-Packard, IBM, Facebook, Groupon, Microsoft, Amazon, Hulu, LinkedIn,LivingSocial, Netflix, Twitter, Yelp, and Zynga all opted out of sharing their government data.

Some companies went so far as to file objections with the Department of Labor, claiming “competitive harm.”

This graphic shows, women and minorities are underrepresented in the available data, and especially at the highest levels of management. Most of the employees at these companies are white and Asian males. But what’s most troubling to diversity advocates is that these companies are so elusive about their lack of diversity, and show no interest in talking about the problem.

Read the entire report at CNN Money.