5、Docusign

成立时间：2003年

已募集的风投资金：5.277亿美元

估值：30亿美元

简介：这家电子签名技术公司在188个国家拥有超过5000万用户，也是这份榜单上成立时间最早的公司。DocuSign成立之初只是为房产中介服务的，后来却被应用到了包括保险、消费品、企业销售、金融、制药在内的各行各业。

尽管该公司上市的流言已经持续了许多年，但DocuSign于今年5月表示已从最近一次募资中获得了2.33亿美元，将无限期地推迟首次公开募股的时间。

5. DocuSign

Year founded: 2003

VC money raised: $527.7 million

Valuation: $3 billion

About: The electronic signature technology firm, which counts more than 50 million users across 188 countries, is the oldest company on this list. Initially created for real estate agents, DocuSign has come to be used in myriad sectors, including insurance, consumer goods, enterprise sales, financial, pharmaceuticals and more.

While reports of the company going public have been swirling for years, DocuSign said in May that it had indefinitely postponed an IPO when it raised $233 million from late-stage investors.