The following fifty-three companies filed an amicus brief in support of Gavin Grimm's fight to protect the rights of transgender students as he prepares to have his case heard before the Supreme Court.

Affirm Inc.
Airbnb Inc.
Amazon.com Inc.
Apple
Asana Inc.
Box Inc.
Codecademy
Credo Mobile
Dropbox Inc.
eBay Inc.
Etsy
Fastly Inc.
Flipboard Inc.
Gap Inc.
General Assembly Space Inc.
GitHub Inc.
IBM
Intel Corporation
Kickstarter
PBC
Knotel Inc.
LinkedIn
Lyft
M Booth
MAC Cosmetics Inc.
Mapbox Inc
Maron Software Incorporated
Massachusetts Mutual Life Insurance
Microsoft Corporation
Mitchell Gold + Bob Williams
MongoDB Inc.
NetApp Inc.
Next Fifteen Communications Corporation
Nextdoor
Pandora Media Inc.
PayPal Holdings Inc.
Postmates Inc.
Replacements Ltd.
RetailMeNot Inc.
Salesforce
Shutterstock Inc.
Slack Technologies Inc.
Spotify
The OutCast Agency
The WhiteWave Foods Company
Tumblr Inc.
Twilio Inc.
Twitter Inc.
Udacity Inc.
Warby Parker
Williams-Sonoma Inc.
Yahoo! Inc.
Yelp Inc.
Zendesk Inc.

Apple, Microsoft, and Amazon combined represent more than $500 billion in total assets, as well as an estimated total of around 500,000 employees, according to information available on Wikipedia.