Rain Rannu

Fortumo OÜ develops and provides mobile payment systems. It enables application and game developers to easily monetize their users through carrier billing. The firm's mobile billing technology is used by online and mobile publishers. The company was founded by Rain Rannu, Martin Koppel and Veljo Otsason in June 2007 and is headquartered in Tartu, Estonia.

Mobi Solutions OÜ is a mobile services company. It engages in the applications and software development and investments in other start-up companies in mobile and B2B internet space. The company was founded by Veljo Otsason, Janek Pello, Veiko Raime, Mark Kofman, and Rain Rannu in October 2000 and is headquartered in Tartu, Estonia.

Superangel OÜ (Superangel) is an independent venture capital firm founded in 2017 by Marek Kiisa, Rain Rannu and Veljo Otsason. The firm is headquartered in Tallinn, Estonia.

Inbank AS provides banking services. Its services include deposit, full service leasing, hire-purchases, interest rates, and loan. The company was founded by Priit Poldoja and Jan Andresoo in 2015 and is headquartered in Tallinn, Estonia.

Decacorn Capital Pte Ltd (Decacorn Capital) is a venture capital firm founded in 2016 by Debneel Mukherjee. The firm is headquartered in Singapore with additional offices in Tel Aviv, Palo Alto, Abu Dhabi and Warsaw.