转载于：http://www.myttnn.com/digital-marketing/ranked-the-hottest-pre-ipo-ad-tech-startups-of-2015/
27. Sharethrough: 最大的原生广告交易平台（native ad exchange）
网址：http://www.sharethrough.com/
推送原生广告的平台，“最大”有点言过其实了，可以在其平台买卖“原生”广告。
26. Taykey: 有谷歌背景
网址：http://www.taykey.com/
提供实时的用户分析及报表相关。有趣的是还有一个RTA学院。
25. Socialbakers: 高富帅CEO和众多的粉丝
网址：http://www.socialbakers.com/
主要是搞社交数据和广告管理相关的。
24. Unruly: Benefiting from the shift of ad dollars from TV to digital video
网址：http://unruly.co/
搞社交视频广告的。
23. Sojern: Has 350 million travelers in its files
网址：http://unruly.co/
22. Kenshoo: 今年想上市
网址：http://kenshoo.com/china/
居然还有中文网站，主要提供搜索广告管理、社交广告管理，以及预测和归因相关分析工具。
21. Tapjoy: App开发者的好基友
网址：http://www.tapjoy.cn/
貌似经常搞积分墙相关，任务相关形式的广告。
20. Kargo: 屌丝公司逆袭中
网址：http://www.kargo.com/
主要搞SSP相关的吧。
19. OpenX: 想早点上市
网址：http://openx.com/
18. Sprinklr: Hugely ambitious and a likely IPO candidate.
网址：https://www.sprinklr.com/
社交媒体相关的管理，以及CRM的东西，之前也简单调研过。
17. Centro: Helping smaller advertisers get into programmatic
16. DataXu: Powered by MIT scientists, and aiming to solve the cross-device issue
15. xAd: Location-focused and making key hires
14. PubMatic: All signs point towards solid growth
13. AdRoll: Lots of ex-Googlers, and working with Apple
12. Collective: Its sell is transparency, one of the biggest issues in ad tech right now.
11. Quantcast: High-profile recent hires and a clear focus
10. Undertone: Has taken the leap into programmatic and has a differentiated offer by focusing on creative
9. Mediaocean: Expanding into programmatic TV
8. Outbrain: An IPO is imminent
7. InMobi: Rumored to have been subject of an acquisition bid by Google
6. Videology: A specialist in the fastest-growing area of online advertising
5. MediaMath: The industry’s favorite
4. Taboola: Expanding internationally at a great clip
3. IronSource: An Israeli unicorn
2. AppNexus: Struck a mega partnership with WPP that will secure long-term ad revenue
1. Pinterest: Valued at $11 billion and making strides on mobile
Pinterest也算广告公司吗？