Form D's
Form D is the document that startup firms need to file when they are raising money and are a type of firm that is exempt from registering with the SEC. While you can search those documents on the official SEC EDGAR site, this site is optimized just for finding a Form D. It has several advanced and filtering functions, including a "newest" filings feature. A range of startups are included, from high tech, social media, bio-tech, hedge funds, and those that are considered in "stealth" mode. Consider this site if you need to find information on all kinds of startup firms around the country.