1. Apple Inc.
2. Audible Inc. by Amazon.com Inc.
3. Barnes & Noble Booksellers Inc.
4. Blackstone Audio
5. Bolinda Digital Pty Ltd
6. Downpour by Blackstone Audio Inc.
7. Google LLC by Alphabet Inc.
8. GraphicAudio
9. Hachette Audio
10. Hachette Audio UK
11. HarperCollins Publishers L.L.C.
12. Hoopla by Midwest Tape
LLC
13. Naxos AudioBooks
14. Oasis Family Media
15. Penguin Random House Audio
16. Playster by Softonic International S.A.
17. Podium Publishing
18. Rakuten Group Inc.
19. Spotify USA Inc.
20. Storytel Sweden AB
21. Tantor Media
22. W.F.Howes Ltd.