Want to Work for a Cloud Company? Here’s the Cream of the Crop by Barb Darrow @FortuneMagazine August 25, 2016, 9:05 AM EST E-mail Tweet Facebook Linkedin Share icons What do Asana, Greenhouse Software, WalkMe, Chef Software, and Sprout Social have in common? They’ve been deemed the very best privately held “cloud” companies to work for, according to new rankings compiled by Glassdoor and venture capital firm Battery Ventures. For “The 50 Highest Rated Private Cloud Computing Companies,” Glassdoor and Battery worked with Mattermark to come up with a list of non-public companies that offer cloud-based services, and then culled them, making sure that each entry had at least 30 Glassdoor reviews, Neeraj Agrawal, Battery Ventures general partner told Fortune. In general, these companies offer either software applications delivered online or some sort of tools or infrastructure to enable such services. Agrawal was surprised at the diversity of the top 50 list. Seven companies offer marketing-related services and seven were in the big data realm, but there were also six companies, including Coupa Software, that sell products to chief financial officers, and five companies each in the human resources, collaboration, IT operations, and security arenas. Another five companies focused on various vertical application areas. Get Data Sheet, Fortune’s technology newsletter. The average rating for the 50 companies was 4.5 stars compared with an average of 3.3 stars of all Glassdoor-ranked companies in aggregate. The 50 ranked companies together employ 26,259 employees for an average of 525 employees each. Asana, a collaboration company co-founded by Facebook fb co-founder Dustin Moskovitz, topped the list with an overall 4.9-star rating. Chief executive Moskovitz himself scored an approval rating of—wait for it—100%. Other familiar companies on the list include PagerDuty, which provides automated paging services; Okta which specializes in identity management; Mirantis, an open-source software specialist; and Dropbox, the big-but-still-private cloud storage and file share company. For more on Glassdoor, watch: As is always the case the definition of “cloud” can be tricky and some of the companies on the top 50 may stretch it a bit. Simplivity and Nutanix, for example, make hardware appliances used in corporate data centers, but if you count that gear as infrastructure to enable the delivery of software services, that’s sort of kosher. Agrawal said he uses Glassdoor rankings before investing in tech companies and that the company ranking site is hugely popular among people looking for jobs.