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. Index Exchange 6 (+/-0)
7. One by AOL 7 (+/-0)
8. PulsePoint 8 (+/-0)
9. SpotX 9 (+/-0)
10. District M 10 (+/-0)
11. FreeWheel 11 (+/-0)
12. Sovrn 12 (+/-0)
13. Telaria (fka Tremor Video) 13 (+/-0)
14. bRealtime 14 (+/-0)
15. LKQD 15 (+/-0)
16. RhythmOne 17 (+1)
17. GumGum 18 (+1)
18. Smart RTB+ 16 (-2)
19. Amazon 19 (+/-0)
20. COMET 20 (+/-0)
21. Teads 21 (+/-0)
22. Improve Digital 23 (+1)
23. Fyber 22 (-1)
24. AdForm 25 (+1)
25. Sonobi 27 (+2)
26. 33Across 26 (+/-0)
27. Criteo 24 (-3)
28. Bidfluence 28 (+/-0)
29. Media.net 30 (+1)
30. Conversant 31 (+1)
31. Taboola 29 (-2)
32. SpringServe 32 (+/-0)
33. Outbrain 33 (+/-0)
34. Smaato 34 (+/-0)
35. UnrulyX 38 (+3)
36. AdYouLike 36 (+/-0)
37. C1X 35 (-2)
38. Smartclip 37 (-1)
39. Sekindo 39 (+/-0)
40. TripleLift 40 (+/-0)
41. LoopMe 43 (+2)
42. ucfunnel 42 (+/-0)
43. Yieldbot 44 (+1)
44. Tribal Fusion 45 (+1)
45. BrightRoll from Yahoo! 41 (-4)
46. Sharethrough 46 (+/-0)
47. Video Intelligence 47 (+/-0)
48. Bidtellect 49 (+1)
49. TidalTV 48 (-1)
50. Somo Audience 51 (+1)

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

What's ads.cert?

Ads.cert is a standard which is designed to sign and verify messages send via OpenRTB (RTB-Requests), allowing a seller to prove that the sold inventory is valid. A message is signed using private keys and can be verified using public keys. This way a buyer can ensure that the offered inventory is valid and adfraud can be reduced. Read more

What's app-ads.txt?

App-ads.txt is the ads.txt standard for mobile apps. It allows buyers to verify that a seller is really allowed to sell inventory for this certain app. It combines the logic from ads.txt with meta information from App stores.