ESO Fund was founded in 2012 and is located in San Mateo, California. It offers tax-efficient financing to help employees exercise stock options without the burden of total loss or long periods of illiquidity. The fund has invested in popular industries such as Enterprise Software and Health Care, and its portfolio includes companies like Twitter, Lending Club, and Petco. ESO Fund typically invests in startups that are 6-10 years old and prefers rounds with 2-3 participants. It has a fast transaction protocol and provides partial liquidity for individuals who have already exercised private stock options.