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. FreeWheel 10 (+/-0)
11. Sovrn 11 (+/-0)
12. Smart RTB+ 12 (+/-0)
13. LKQD 13 (+/-0)
14. Telaria (fka Tremor Video) 14 (+/-0)
15. District M 15 (+/-0)
16. GumGum 16 (+/-0)
17. Fyber 17 (+/-0)
18. Improve Digital 18 (+/-0)
19. Amazon 19 (+/-0)
20. bRealtime 20 (+/-0)
21. AdForm 21 (+/-0)
22. COMET 22 (+/-0)
23. Teads 23 (+/-0)
24. Criteo 24 (+/-0)
25. Bidfluence 25 (+/-0)
26. RhythmOne 26 (+/-0)
27. SpringServe 27 (+/-0)
28. 33Across 28 (+/-0)
29. Taboola 29 (+/-0)
30. Sonobi 30 (+/-0)
31. Conversant 31 (+/-0)
32. Media.net 32 (+/-0)
33. AdYouLike 36 (+3)
34. BrightRoll from Yahoo! 33 (-1)
35. Smaato 37 (+2)
36. Sharethrough 34 (-2)
37. C1X 35 (-2)
38. TidalTV 38 (+/-0)
39. Video Intelligence 40 (+1)
40. Sekindo 39 (-1)
41. Synacor 42 (+1)
42. TripleLift 41 (-1)
43. Smartclip 43 (+/-0)
44. Yieldbot 45 (+1)
45. ucfunnel 44 (-1)
46. Outbrain 53 (+7)
47. RevContent 51 (+4)
48. Imonomy 46 (-2)
49. Aerserv 48 (-1)
50. Bidtellect 58 (+8)

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.