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