Mark D. Millett was named Chief Executive Officer of Steel Dynamics Inc. As of November 6, 2026, Steel Dynamics Inc has reported one leadership change filing to the SEC under Item 5.02 of Form 8-K, on August 4, 2026, naming 3 appointments (Form 8-K, August 4, 2026).
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Key facts
- · In / out: In · Person: Mark D. Millett · Role: Chief Executive Officer · 8-K, 2026-08-04
- · In / out: In · Person: Theresa E. Wagler · Role: Chief Financial Officer · Effective: 2027-01-01 · 8-K, 2026-08-04
- · In / out: In · Person: Theresa E. Wagler · Role: Director · 8-K, 2026-08-04
Steel Dynamics Inc reported a change among its directors and officers to the SEC on Form 8-K, Item 5.02, on 2026-08-04. It names 2 people. Every row below is cited to the filing it comes from, and this page adds each new change as Steel Dynamics Inc files it.
Also on the record for Steel Dynamics Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 5, 2026 | Stake report, Schedule 13G/A, by FMR LLC | 3.8% of the class | 5%+ stakes | Source |
| August 6, 2026 | Stake report, Schedule 13G, by FMR LLC | 5.4% of the class | 5%+ stakes | Source |
| May 12, 2026 | Stake report, Schedule 13G, by STATE STREET CORPORATION | 5.2% of the class | 5%+ stakes | Source |
| April 30, 2026 | Stake report, Schedule 13G, by Vanguard Capital Management | 7.14% of the class | 5%+ stakes | Source |
| March 27, 2026 | Stake report, Schedule 13G/A, by The Vanguard Group | — | 5%+ stakes | Source |
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More on Steel Dynamics Inc and the records around it.
Steel Dynamics Inc elsewhere on the record
Companies that share a holder
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-08-04 | In | Chief Executive Officer | 8-K, 2026-08-04 | ||
| 2026-08-04 | In | Chief Financial Officer | 2027-01-01 | 8-K, 2026-08-04 | |
| 2026-08-04 | In | Director | 8-K, 2026-08-04 |
Who leads Steel Dynamics Inc, as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- Chief Financial Officer: Theresa E. Wagler, appointed, effective 2027-01-01 (filed 2026-08-04).
- Director: Theresa E. Wagler, appointed (filed 2026-08-04).
- Chief Executive Officer: Mark D. Millett, appointed (filed 2026-08-04).
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Find candidates like Chief Executive Officer at Steel Dynamics IncEvery change, in the filing's words
Appointed: Mark D. Millett, Chief Executive Officer
The Board has appointed Mr. Millett as the Company's Executive Chairman concurrently with his retirement as Chief Executive Officer.
Appointed: Theresa E. Wagler, Chief Financial Officer, effective 2027-01-01
The Board made the following additional appointments effective January 1, 2027: (i) Theresa E. Wagler, the Company's Executive Vice President and Chief Financial Officer, will become the Company's President and Chief Executive Officer and (ii) Richard A. Poinsatte, the Company's Executive Vice President and Treasurer, will become the Company's Executive Vice President and Chief Financial Officer.
Appointed: Theresa E. Wagler, Director
Effective immediately, the Board appointed Ms. Wagler as a member of the Board and increased the size of the Board from seven to eight members.
- On August 3, 2026, Mark D. Millett, Steel Dynamics, Inc.'s (the "Company") Chairman and Chief Executive Officer gave notice to the Company's Board of Directors (the "Board") of his intention to retire as Chief Executive Officer of the Company effective January 1, 2027.
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.