Steel Dynamics CEO Mark Millett to Retire; CFO Theresa Wagler Named Successor in Major Leadership Overhaul
STLD has more than doubled off its 52-week low of $119.89 on light trading volume (0.1× avg).
Summary
Steel Dynamics CEO Mark Millett will retire as CEO on January 1, 2027, handing the reins to CFO Theresa Wagler. The company also announced a series of senior leadership changes effective September 2026 and January 2027, reflecting a long-planned succession.
Key Events · Executive and Board Changes · STLD
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CEO Succession Announced
Mark D. Millett will retire as CEO effective January 1, 2027, and become Executive Chairman. Theresa E. Wagler, currently CFO, will become President and CEO on that date.
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CFO Transition
Richard A. Poinsatte, currently Executive Vice President and Treasurer, will succeed Wagler as CFO effective January 1, 2027.
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Senior Leadership Reshuffle
Effective September 1, 2026, Barry Schneider becomes CTO, Miguel Alvarez becomes COO of Aluminum and Recycling, James Anderson becomes COO of Construction Products, and Christopher Graham becomes COO of Flat Rolled Steel.
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Board Expansion
Theresa Wagler was appointed to the board immediately, increasing its size from seven to eight members.
Analysis · STLD · Manufacturing
A sweeping leadership transition is underway at Steel Dynamics. CEO Mark Millett will retire on January 1, 2027, and become Executive Chairman, while long-time CFO Theresa Wagler steps into the CEO role. The move caps a deliberate succession plan at the $37B steelmaker, which has delivered record results and strong shareholder returns. Wagler, a 28-year company veteran, has been instrumental in capital allocation and strategic growth. Simultaneous C-suite changes — including a new CFO and new COO roles — signal a deep bench and continuity. The market will watch for any strategic shifts under Wagler, but the orderly handoff and internal promotions suggest stability.
At the time of this filing, STLD was trading at $260.60 on NASDAQ in the Manufacturing sector, with a market capitalization of approximately $37.4B. The 52-week trading range was $119.89 to $288.74. This filing was assessed with neutral market sentiment and an importance score of 8 out of 10.