SumZero is an online community for professional investors (collectively referred to as the "buyside"), which hosts investment research, job opportunities, and capital introduction services.

The site's co-founder and current CEO Divya Narendra came up with the idea for SumZero in April 2007, while working for the hedge fund Sowood Capital in Boston.

Over 250 SumZero members attended for live 4-minute presentations of stock pitches from 20 emerging managers, judged by a panel of professional investors.

Massif Capital, a NY-based long/short equity fund was selected as the final winner of the Challenge for founder Will Thomson's stock pitch on Lucara Diamond.

The Cap Intro platform allows emerging fund managers to raise external capital by connecting them with a community of pre-vetted Allocators.

Price III, "Do Buy-Side Recommendations Have Investment Value?”, analyzes a subset of SumZero's Idea database, which is composed of 2,135 long and short calls on U.S. equity securities submitted to the website by 1,112 buyside analysts from 910 different funds.