Founded in 2003 by Fred Wilson and Brad Burnham, Union Square Ventures (USV) is a New York-based venture capital firm.

The firm is best known for its early investments in companies including Zynga, Twitter and Tumblr.

USV is one of a handful of firms that regularly included in Red Herring’s lists of top venture capital firms. In 2011, USV was deemed as being the best performing VC in the US based on investment return rate.

Other companies in their portfolio include SoundCloud, KIK and Kickstarter.