Here is the list of Top 10 companies using ReactJs framework. All of them have proven experience and successful projects: 

1. Swensson He

2. WillowTree

3. XB Software

4. Wasko Software

5. Merixstudio

6. Spec India

7. Powercode

8. 7Edge

9. Simbirsoft

10. OpenXcell

All companies listed above proved themselves to be reliable partners delivering the best solutions to the partners. For the detailed information about each company please read the article Top 10 ReactJS Development Companies in 2021