ads.txt Company Ranking

adstxtlab constantly crawls the web for ads.txt files and monitors their results. While doing that, we get a deep insight in how the advertising world looks like. With this data we create a monthly ranking of companies that are listed in the ads.txt files around the world. Here is the current top 50:

Top 50 company ranking

#CompanyLast month
1. Google 1 (+/-0)
2. AppNexus 2 (+/-0)
3. Rubicon Project 3 (+/-0)
4. PubMatic 4 (+/-0)
5. OpenX 5 (+/-0)
6. PulsePoint 6 (+/-0)
7. One by AOL 7 (+/-0)
8. Index Exchange 8 (+/-0)
9. SpotX 9 (+/-0)
10. FreeWheel 10 (+/-0)
11. Sovrn 11 (+/-0)
12. Smart RTB+ 12 (+/-0)
13. Telaria (fka Tremor Video) 13 (+/-0)
14. LKQD 14 (+/-0)
15. Fyber 15 (+/-0)
16. District M 17 (+1)
17. Improve Digital 16 (-1)
18. Amazon 18 (+/-0)
19. GumGum 19 (+/-0)
20. bRealtime 20 (+/-0)
21. Criteo 21 (+/-0)
22. Teads 22 (+/-0)
23. AdForm 23 (+/-0)
24. 33Across 24 (+/-0)
25. Bidfluence 28 (+3)
26. RhythmOne 25 (-1)
27. Taboola 26 (-1)
28. SpringServe 27 (-1)
29. COMET 30 (+1)
30. Conversant 29 (-1)
31. C1X 32 (+1)
32. Sonobi 31 (-1)
33. BrightRoll from Yahoo! 33 (+/-0)
34. Sharethrough 34 (+/-0)
35. TidalTV 35 (+/-0)
36. Media.net 42 (+6)
37. Sekindo 36 (-1)
38. Video Intelligence 37 (-1)
39. AdYouLike 38 (-1)
40. TripleLift 39 (-1)
41. Synacor 40 (-1)
42. Smartclip 41 (-1)
43. ucfunnel 43 (+/-0)
44. Imonomy 44 (+/-0)
45. Exponential 45 (+/-0)
46. Tribal Fusion 46 (+/-0)
47. Smaato 48 (+1)
48. Inneractive 47 (-1)
49. Optimatic 49 (+/-0)
50. Yieldmo 50 (+/-0)

Want to know more?

The full list of more than 250 companies is available on request. Please get in touch with us.

What's ads.txt?

Ads.txt stands for "Authorized Digital Sellers". It is a mechanism on how a publisher/website owner can tell potential buyers that the traffic they are buying is valid. It also tells the buyer that the SSP/DSP from which they are receiving the traffic is wanted/allowed by the publisher. This prevents third parties ("ad-frauders") to send traffic to buyers and claim that the traffic originates from your website (by falsifying the referrer domain in the bid-request). Read more