Goldman Sachs is one of the biggest startup backers on Wall Street

Goldman Sachs has been dialing up its presence in the startup investing space over the last several years.

The bank invests directly in deals and also wields a network of high-net-worth clients who are eager to back hot startups.

Some of these investments are about gaining access to technology that Goldman might use in its own business - like Kensho, which creates analytics platforms that could help answer complex financial questions.

Others - like stakes in Facebook ahead of its IPO and Uber - have paid off twice: first as investments, and second when the investment bank landed big roles advising company deals.

Goldman, for example, was an investor in Square in 2012 and 2014, and also the lead underwriter of its initial public offering last week. JPMorgan, another Square underwriter, was also an investor in the company.

Goldman has made over 300 such investments, according to data from CrunchBase.

They include deals led by the tech investment banking group, an investment team housed in the securities division that puts money into trading technology company, and units housed in the investing and lending division.

Here's some of the investment bank's most notable deals, including exits: