Some of the companies/startups are
- Blink Watch (I'm working here)
- Airbnb
- Walmart
- Tesla
- Tencent QQ
- Hike Messenger
- Baidu
- Discovery VR
- Bitt Wallet
- UberEATS
- Myntra
- Discord
- Godaddy
- Goibibo
- Vogue
- Leanpub
- WEARVR
- Artsy
You can check more in React Native Showcase