Stephen Mikkelsen was appointed chief executive officer and managing director in 2023, after originally joining Sims Limited in 2018 as the global chief financial officer. He is a member of the Safety, Health, Environment, Community & Sustainability Committee. He brings more than 30 years of finance and executive management experience to the company.

Prior to joining Sims Limited, Stephen held senior leadership positions at AGL Energy, including serving as chief financial officer from 2006 to 2012, followed by group general manager Retail Energy and executive general manager Energy Markets. Before his tenure at AGL, Stephen was the chief financial officer of Snowy Hydro from 2001 to 2006. Stephen is a member of Chartered Accountants Australia & New Zealand.