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. One by AOL 7 (+1)
7. Index Exchange 8 (+1)
8. PulsePoint 6 (-2)
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. District M 15 (+/-0)
16. Fyber 16 (+/-0)
17. Improve Digital 17 (+/-0)
18. GumGum 19 (+1)
19. Amazon 18 (-1)
20. bRealtime 20 (+/-0)
21. AdForm 23 (+2)
22. Criteo 21 (-1)
23. Teads 22 (-1)
24. COMET 25 (+1)
25. Bidfluence 24 (-1)
26. 33Across 26 (+/-0)
27. RhythmOne 27 (+/-0)
28. SpringServe 28 (+/-0)
29. Taboola 29 (+/-0)
30. Conversant 30 (+/-0)
31. Sonobi 32 (+1)
32. Media.net 33 (+1)
33. C1X 31 (-2)
34. BrightRoll from Yahoo! 34 (+/-0)
35. Sharethrough 35 (+/-0)
36. TidalTV 36 (+/-0)
37. AdYouLike 39 (+2)
38. Sekindo 37 (-1)
39. Video Intelligence 38 (-1)
40. Smaato 46 (+6)
41. TripleLift 40 (-1)
42. Synacor 41 (-1)
43. Smartclip 42 (-1)
44. ucfunnel 43 (-1)
45. Imonomy 44 (-1)
46. Exponential 45 (-1)
47. Tribal Fusion 47 (+/-0)
48. Yieldbot 62 (+14)
49. Optimatic 48 (-1)
50. Inneractive 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

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.