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. RhythmOne 12 (+/-0)
13. FreeWheel 13 (+/-0)
14. Telaria (fka Tremor Video) 14 (+/-0)
15. bRealtime 15 (+/-0)
16. Amazon 17 (+1)
17. Smart RTB+ 16 (-1)
18. GumGum 18 (+/-0)
19. Improve Digital 19 (+/-0)
20. 33Across 20 (+/-0)
21. LKQD 21 (+/-0)
22. COMET 22 (+/-0)
23. Sonobi 23 (+/-0)
24. Teads 24 (+/-0)
25. Criteo 25 (+/-0)
26. Conversant 27 (+1)
27. Bidfluence 26 (-1)
28. AdForm 28 (+/-0)
29. Fyber 29 (+/-0)
30. TripleLift 30 (+/-0)
31. LoopMe 32 (+1)
32. UnrulyX 35 (+3)
33. Media.net 33 (+/-0)
34. Gemini from Yahoo! 38 (+4)
35. SpringServe 31 (-4)
36. Taboola 34 (-2)
37. AdYouLike 37 (+/-0)
38. Smaato 36 (-2)
39. Outbrain 39 (+/-0)
40. Synacor 40 (+/-0)
41. Sharethrough 41 (+/-0)
42. Undertone 42 (+/-0)
43. Bidtellect 43 (+/-0)
44. ucfunnel 45 (+1)
45. Smartclip 44 (-1)
46. AdMixer 46 (+/-0)
47. Adman Media 48 (+1)
48. onetag.com 47 (-1)
49. connectad.io 50 (+1)
50. Lockerdome 53 (+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.