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. Rubicon Project 2 (+/-0)
3. PubMatic 3 (+/-0)
4. AppNexus 4 (+/-0)
5. OpenX 5 (+/-0)
6. Index Exchange 6 (+/-0)
7. Smart RTB+ 8 (+1)
8. PulsePoint 10 (+2)
9. Sovrn 7 (-2)
10. Improve Digital 11 (+1)
11. RhythmOne 9 (-2)
12. One by AOL 16 (+4)
13. FreeWheel 23 (+10)
14. Gemini from Yahoo! 13 (-1)
15. UnrulyX 12 (-3)
16. Amazon 14 (-2)
17. SpotX 27 (+10)
18. bRealtime 25 (+7)
19. 33Across 18 (-1)
20. GumGum 15 (-5)
21. Sharethrough 17 (-4)
22. onetag.com 21 (-1)
23. Criteo 24 (+1)
24. TripleLift 19 (-5)
25. Telaria (fka Tremor Video) 30 (+5)
26. Smaato 29 (+3)
27. Sonobi 22 (-5)
28. Media.net 20 (-8)
29. AdForm 32 (+3)
30. LoopMe 35 (+5)
31. Conversant 26 (-5)
32. District M 31 (-1)
33. Bidfluence 34 (+1)
34. AdYouLike 36 (+2)
35. Adman Media 33 (-2)
36. Teads 37 (+1)
37. Yieldmo 28 (-9)
38. LKQD 38 (+/-0)
39. pubnative.net 41 (+2)
40. inmobi.com 39 (-1)
41. Synacor 40 (-1)
42. Outbrain 46 (+4)
43. richaudience.com 47 (+4)
44. ad-generation.jp 42 (-2)
45. e-Planning 45 (+/-0)
46. Undertone 44 (-2)
47. AdColony 52 (+5)
48. Smarty Ads 48 (+/-0)
49. Video Intelligence 56 (+7)
50. AdMixer 49 (-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.