Sum Ventures operates as a first-check venture fund with a portfolio where 40% of companies are founded by women and 50% by immigrants, and 53 other funds have followed them as first-money-in on deals including breakout companies like Brius, PlantSwitch, and Irrigreen. The fund's partners serve as actual board members and C-level executives at portfolio companies while leveraging deep corporate relationships, particularly with Siemens and Douglas Elliman, to structure strategic partnerships that unlock non-dilutive capital and follow-on funding.