Steel Dynamics

Steel Dynamics announced a leadership change on August 4, 2026. Steel Dynamics announced that CFO Theresa E. Wagler will become President and CEO effective January 1, 2027, when Mark D. Millett retires as CEO and becomes Executive Chairman.

What changed

Theresa E. Wagler was named President and Chief Executive Officer. Mark D. Millett will retire as CEO and transition to Executive Chairman of the board of directors, effective January 1, 2027.

• Leader: Theresa E. Wagler
• Role: President and Chief Executive Officer
• Effective: January 1, 2027
• Announcement date: August 4, 2026

Leadership background

Wagler has been Executive Vice President, Chief Financial Officer and Corporate Secretary of Steel Dynamics since May 2007. She joined the company in 1998 and has held various strategic, operational, finance, and accounting positions. Before joining Steel Dynamics she was a certified public accountant with Ernst and Young LLP. She graduated from Taylor University with a bachelor’s degree in accounting and systems analysis.

The mandate

Steel Dynamics said its board unanimously approved the appointment and expressed confidence in Wagler to lead the company into its next chapter of growth and value creation. The company said the succession supports continuity as it advances its strategy.

Why this matters for GTM teams

Executive appointments can precede changes in strategy, operating cadence, hiring, partnerships, and technology priorities. The useful signal is not the title alone: teams should watch the new leader’s stated mandate, prior playbook, organizational scope, and the initiatives announced during the first two quarters.

Source and methodology

This leadership profile is based on the company’s announcement. Roles, transition timing, and biographical details are presented as announced; SalesTools Research does not infer undisclosed succession plans.

Primary source: Steel Dynamics leadership announcement.