Toma manages Japanese equities across Marathon's International and Japanese equity portfolios and is a member of Marathon’s Partners Group. He joined Marathon in August 2018, initially as a Japan equity Analyst before assuming portfolio management responsibilities in July 2022. Toma joined from Orbis Investments where, from 2014, he worked as a generalist in the Japanese equity team.

Toma holds a BEng from University College London and holds an MPhil from the University of Cambridge. He is also a CFA charterholder.