Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.

CB Insights - CB Insights is a company database for the venture capital and corporate development community.

PitchBook - PitchBook is an award winning data & technology provider for the global private equity and...

eMarketer - eMarketer is an independent market research company that provides insights and trends related to digital marketing, media and commerce.

Tracxn - data on companies

Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.