When Facebook disclosed data on its workforce diversity last month, it was both good news and bad news regarding female employees.

The good: Women hold 47 percent of non-technology jobs, such as in sales, marketing and finance. The bad: Just 15 percent of its engineers and computer scientists are women.

Many tech companies know they have a lot of work to do when it comes to diversity in their workforce, especially in technical positions. But some companies seem to be having an easier time hiring female techies than others.

Entelo, a startup that analyzes social data to help corporate recruiters spot promising candidates, put together a list of tech companies with some of the highest percentages of female technologists.

Of course, only the companies know precisely their gender breakdown, and just a few have publicized their numbers. Last month, Google revealed that 17 percent of its technology employees are female, roughly the same number that Entelo had previously estimated.

Entelo, whose customers include Facebook, Salesforce and UPS, recently started a service specifically for companies that want to increase their hiring of women, Hispanics, blacks and people with military experience.

Out of hundreds of tech companies Entelo analyzed, here are a dozen with some of the highest percentages of female techies.