Opendoor, founded in 2014 by Eric Wu, JD Ross, Ian Wong, and Keith Rabois, has raised $1.35B across Series E and Post-IPO rounds, including $850M in 2021 and $400M in 2018. The company digitizes home buying and selling with instant offers, remote inspections, and closing coordination. Funding supported inventory build, product integrations, and national scaling. Opendoor combines automated valuation, retail real estate, and optional mortgage services to streamline transactions. Key investors include Khosla Ventures and General Atlantic.