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