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