Mark D. Millett
Chairman and CEO at Steel Dynamics Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Steel Dynamics Inc., 3 years.
Steel Dynamics Inc.
Director · Chairman and CEO
Chief executive roles
Steel Dynamics Inc.
· Chairman and CEO
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jul 28, 2026 | Steel Dynamics Inc. | Gift | −300 | — | — |
| Mar 13, 2026 | Steel Dynamics Inc. | Grant or award | +46,422 | — | — |
| Mar 13, 2026 | Steel Dynamics Inc. | Shares withheld for tax | −20,625 | $182.19 | $3,757,669 |
| Feb 24, 2026 | Steel Dynamics Inc. | Shares withheld for tax | −5,153 | $196.01 | $1,010,040 |
| Feb 23, 2026 | Steel Dynamics Inc. | Shares withheld for tax | −2,928 | $193.39 | $566,246 |
| Feb 23, 2026 | Steel Dynamics Inc. | Shares withheld for tax | −2,934 | $193.39 | $567,406 |
| Feb 20, 2026 | Steel Dynamics Inc. | Grant or award | +12,662 | — | — |
| Nov 21, 2025 | Steel Dynamics Inc. | Grant or award | +569 | — | — |
| Nov 21, 2025 | Steel Dynamics Inc. | Shares withheld for tax | −253 | $153.11 | $38,737 |
| May 19, 2025 | Steel Dynamics Inc. | Gift | −37,000 | — | — |
| May 9, 2025 | Steel Dynamics Inc. | Gift | −500 | — | — |
| Mar 14, 2025 | Steel Dynamics Inc. | Grant or award | +81,171 | — | — |
| Mar 14, 2025 | Steel Dynamics Inc. | Shares withheld for tax | −36,104 | $119.40 | $4,310,818 |
| Feb 25, 2025 | Steel Dynamics Inc. | Shares withheld for tax | −3,931 | $133.15 | $523,413 |
| Feb 24, 2025 | Steel Dynamics Inc. | Shares withheld for tax | −5,159 | $130.71 | $674,333 |
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