Apollo.io

Apollo.io is a B2B sales intelligence and engagement platform founded in 2015 by Tim Zheng, Ray Li, and Dorian Ciavarella, and headquartered in San Francisco, California. The company provides software that combines a large contact and company database with outreach and workflow automation tools aimed at sales and go-to-market teams.

Apollo.io's core product includes a database of over 275 million contacts and 73 million companies, along with tools for email sequencing, dialing, LinkedIn outreach, and CRM enrichment. The platform is used by sales development representatives, account executives, and revenue operations teams across companies ranging from small businesses to mid-market enterprises. Apollo competes with platforms such as ZoomInfo, Outreach, and Salesloft.

The company raised a $100 million Series D round in 2023, bringing its total funding to approximately $251 million. Investors include Sequoia Capital, Tribe Capital, and Nexus Venture Partners. Apollo.io has grown its user base substantially through a product-led growth model that includes a free tier, and the company has reported reaching profitability. As of the mid-2020s, Apollo employs several hundred people.