1. AlKhalil Arabic
2. Babbel GmbH
3. Berlitz Corporation
4. Busuu Ltd. by Chegg Inc.
5. Cengage Learning Holdings II Inc.
6. Drops by Kahoot!
7. Duolingo Inc.
8. EF Education First by Signum International AG
9. ELSA Corp.
10. FluentU by Enux Education Limited
11. Fluenz
12. HelloTalk
13. Houghton Mifflin Harcourt Company
14. Idyoma
LLC
15. italki HK Limited
16. Kamkalima
17. Lingoda GmbH
18. Linguistica 360 Inc.
19. Mango Languages
20. McGraw-Hill Education Inc.
21. Memrise Ltd.
22. Pearson PLC
23. Penguin Random House
LLC
24. Pimsleur by Simon & Schuster LLC
25. Preply Inc.
26. Rocket Languages
27. Rosetta Stone
LLC by IXL Learning
28. Tandem
29. Transparent Language Inc.
30. Voxy Inc.