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.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Steel Dynamics Inc. May 6, 202695.1%
-
Steel Dynamics Inc. April 25, 202593.8%
-
Steel Dynamics Inc. May 9, 202493.0%
-
Steel Dynamics Inc. May 11, 202392.4%
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 |
Questions about Mark D. Millett
What boards is Mark D. Millett on?
Mark D. Millett sits on the board of Steel Dynamics Inc.
What company is Mark D. Millett the CEO of?
Mark D. Millett is Chairman and CEO of Steel Dynamics Inc.
How long has Mark D. Millett served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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