The 2015 Tech IPO Pipeline focused exclusively on U.S. based companies, ignoring the hundreds of other companies planning on going public in the coming year. These are four non-U.S. startups worth keeping an eye on.

With over 67 tech IPO exits valued at $33.3 billion in total, 2014 has shaped up to be one of the best years for tech investors since the dot.com boom. And with a recent report from CBS Insights indicating that there are 588 tech companies in the IPO Pipeline for 2015, it seems the coming year is going to be another strong one. But focusing exclusively on U.S. tech companies, as this report does, fails to tell the full story.

All the IPO Pipeline companies mentioned in the CBS Insights report have valuations over $1,000,000, having already cumulatively raised $64.27 billion in funding. They are, however, all U.S. based with 315 of the companies located in Silicon Valley. A look at the global tech IPO Pipeline sheds a light on some of the up and coming tech hubs worth watching, and indicates just how far-reaching this tech boom is.

Tech IPOs outside the U.S. to watch out for:  

1. Xiaomi

Photo credit: PR Screenshot, Xiaomi

As one of China's leading smartphone manufacturers, it's expected that Xiaomi will ship more than 100 million devices in 2015. Xiaomi was established in 2010 and has rapidly expanded both its offering and market share since its initial launch. In February, Xiaomi launched in Singapore and plans to expand across Asia. But it's Brazil, Russia, Turkey, Mexico and other emerging markets that the company has its sights set on.

Xiaomi is in talks with a Russian investment firm, which also invested in Facebook and Alibaba, to raise $1.5 billion in funding. Should this be successful, it will be one of the largest funding rounds since Facebook's $1.5 billion round in 2011. This would increase the company's valuation to $40 billion. The startup has already raised $347 million in funding and is estimated to be worth $4 billion. There are rumors that the company could be planning to go public in the U.S. and Hong Kong in 2015.