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. Telaria (fka Tremor Video) 13 (+/-0)
14. RhythmOne 14 (+/-0)
15. bRealtime 15 (+/-0)
16. LKQD 16 (+/-0)
17. Amazon 17 (+/-0)
18. GumGum 18 (+/-0)
19. Smart RTB+ 19 (+/-0)
20. Improve Digital 23 (+3)
21. COMET 20 (-1)
22. 33Across 22 (+/-0)
23. Teads 21 (-2)
24. Fyber 25 (+1)
25. Sonobi 27 (+2)
26. AdForm 24 (-2)
27. Bidfluence 26 (-1)
28. Criteo 28 (+/-0)
29. SpringServe 29 (+/-0)
30. Conversant 30 (+/-0)
31. Taboola 31 (+/-0)
32. Media.net 32 (+/-0)
33. TripleLift 34 (+1)
34. LoopMe 33 (-1)
35. AdYouLike 35 (+/-0)
36. Outbrain 37 (+1)
37. Smaato 40 (+3)
38. Sharethrough 38 (+/-0)
39. Smartclip 39 (+/-0)
40. UnrulyX 36 (-4)
41. Synacor 41 (+/-0)
42. Gemini from Yahoo! 55 (+13)
43. ucfunnel 42 (-1)
44. C1X 43 (-1)
45. Bidtellect 46 (+1)
46. Sekindo 44 (-2)
47. BrightRoll from Yahoo! 45 (-2)
48. connectad.io 47 (-1)
49. Undertone 58 (+9)
50. Quantum Native 49 (-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.