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

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.