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. FreeWheel 10 (+/-0)
11. Sovrn 11 (+/-0)
12. District M 12 (+/-0)
13. Telaria (fka Tremor Video) 13 (+/-0)
14. bRealtime 15 (+1)
15. Smart RTB+ 14 (-1)
16. LKQD 16 (+/-0)
17. Amazon 17 (+/-0)
18. GumGum 18 (+/-0)
19. RhythmOne 19 (+/-0)
20. COMET 20 (+/-0)
21. Fyber 21 (+/-0)
22. Improve Digital 22 (+/-0)
23. Teads 25 (+2)
24. Criteo 23 (-1)
25. 33Across 24 (-1)
26. AdForm 26 (+/-0)
27. Sonobi 28 (+1)
28. Bidfluence 27 (-1)
29. Taboola 30 (+1)
30. Conversant 29 (-1)
31. Media.net 31 (+/-0)
32. SpringServe 32 (+/-0)
33. Outbrain 35 (+2)
34. Smaato 33 (-1)
35. C1X 34 (-1)
36. AdYouLike 37 (+1)
37. Smartclip 36 (-1)
38. UnrulyX 41 (+3)
39. Sekindo 39 (+/-0)
40. TripleLift 40 (+/-0)
41. BrightRoll from Yahoo! 38 (-3)
42. Yieldbot 47 (+5)
43. ucfunnel 49 (+6)
44. Sharethrough 43 (-1)
45. Tribal Fusion 45 (+/-0)
46. Video Intelligence 44 (-2)
47. TidalTV 46 (-1)
48. Bidtellect 51 (+3)
49. Somo Audience 50 (+1)
50. LoopMe 55 (+5)

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.