Nikon SLM Solutions is replacing its CEO Sam O'Leary with a two-person leadership team. The finance chief and the technology chief become Co-Presidents in the fourth quarter of 2026, while O'Leary moves to the Supervisory Board. The company calls it a continuity move, timed just before the MACHX launch at Formnext.
Who takes over and when?
During Q4 2026, Jan-Niklas Thielmann, who is responsible for finance and administration, and Simone Castellani, responsible for technology and engineering, become Co-Presidents. Both also join the Management Board and will run daily operations.
What happens to O'Leary?
O'Leary moves to the Supervisory Board and stays involved in strategy and in support for customers and partners. He also plans to work in professional sports and entertainment. Hamid Zarringhalam continues as Chairman of the Supervisory Board and oversees Nikon SLM as part of Nikon Advanced Manufacturing.
Why the timing matters
All quoted executives describe the change as continuity from a position of strength. They point to the MACHX launch at Formnext, about two weeks after the announcement, as the immediate focus.
What it means
For buyers of metal powder bed fusion systems, a leadership change just before a major platform launch raises the usual questions about roadmap and service continuity. Both new co-presidents come from inside the firm and the parent group stays in place, which points to stability. Practical due diligence still applies: ask about support commitments and delivery schedules for MACHX rather than relying on statements of continuity.
Frequently asked questions
Who leads Nikon SLM Solutions after the change?
Jan-Niklas Thielmann and Simone Castellani share the role of Co-President and run daily operations, with Hamid Zarringhalam chairing the Supervisory Board.
Is Nikon SLM changing strategy?
The company says no. It describes the move as continuity, with customers, people and technology remaining the priorities.