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. AppNexus 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. Smart RTB+ 12 (+2)
11. Sovrn 10 (-1)
12. RhythmOne 11 (-1)
13. District M 13 (+/-0)
14. bRealtime 16 (+2)
15. FreeWheel 14 (-1)
16. GumGum 15 (-1)
17. Improve Digital 17 (+/-0)
18. Amazon 18 (+/-0)
19. Telaria (fka Tremor Video) 19 (+/-0)
20. Gemini from Yahoo! 21 (+1)
21. 33Across 20 (-1)
22. LKQD 22 (+/-0)
23. Teads 23 (+/-0)
24. Sonobi 24 (+/-0)
25. UnrulyX 25 (+/-0)
26. Smaato 28 (+2)
27. TripleLift 27 (+/-0)
28. AdForm 26 (-2)
29. Criteo 30 (+1)
30. Conversant 31 (+1)
31. Bidfluence 29 (-2)
32. Sharethrough 32 (+/-0)
33. LoopMe 33 (+/-0)
34. AdYouLike 34 (+/-0)
35. onetag.com 36 (+1)
36. COMET 35 (-1)
37. Adman Media 38 (+1)
38. Synacor 37 (-1)
39. Media.net 39 (+/-0)
40. Outbrain 40 (+/-0)
41. Yieldmo 44 (+3)
42. Undertone 42 (+/-0)
43. SpringServe 41 (-2)
44. Fyber 43 (-1)
45. pubnative.net 45 (+/-0)
46. ad-generation.jp 46 (+/-0)
47. Taboola 47 (+/-0)
48. Bidtellect 48 (+/-0)
49. AdMixer 49 (+/-0)
50. e-Planning 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.