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 7 (+1)
7. One by AOL 6 (-1)
8. PulsePoint 8 (+/-0)
9. SpotX 9 (+/-0)
10. FreeWheel 10 (+/-0)
11. Sovrn 11 (+/-0)
12. Smart RTB+ 12 (+/-0)
13. LKQD 14 (+1)
14. Telaria (fka Tremor Video) 13 (-1)
15. District M 15 (+/-0)
16. GumGum 18 (+2)
17. Fyber 16 (-1)
18. Improve Digital 17 (-1)
19. Amazon 19 (+/-0)
20. bRealtime 20 (+/-0)
21. AdForm 21 (+/-0)
22. COMET 24 (+2)
23. Teads 23 (+/-0)
24. Criteo 22 (-2)
25. Bidfluence 25 (+/-0)
26. RhythmOne 27 (+1)
27. SpringServe 28 (+1)
28. 33Across 26 (-2)
29. Taboola 29 (+/-0)
30. Sonobi 31 (+1)
31. Conversant 30 (-1)
32. Media.net 32 (+/-0)
33. BrightRoll from Yahoo! 34 (+1)
34. Sharethrough 35 (+1)
35. C1X 33 (-2)
36. AdYouLike 37 (+1)
37. Smaato 40 (+3)
38. TidalTV 36 (-2)
39. Sekindo 38 (-1)
40. Video Intelligence 39 (-1)
41. TripleLift 41 (+/-0)
42. Synacor 42 (+/-0)
43. Smartclip 43 (+/-0)
44. ucfunnel 44 (+/-0)
45. Yieldbot 48 (+3)
46. Imonomy 45 (-1)
47. Exponential 46 (-1)
48. Aerserv 54 (+6)
49. Inneractive 50 (+1)
50. Tribal Fusion 47 (-3)

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.