STLD CEO granted shares; tax withholding reported

STEEL DYNAMICS INC Chairman and CEO Mark D. Millett reported routine equity compensation activity.

Rhea-AI Filing Summary

STEEL DYNAMICS INC Chairman and CEO Mark D. Millett reported routine equity compensation activity. He received a grant of 46,422 shares of Common Stock at $0.00 per share under the company’s 2023 Equity Incentive Plan, as part of a long-term incentive program.

On the same date, 20,625 shares of Common Stock at $182.19 per share were withheld by the company to cover Millett’s tax obligations related to this equity award. After these transactions, he directly holds 3,016,701 shares of Common Stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider MILLETT MARK D

Role Chairman and CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	46,422	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	20,625	$182.19	$3.76M

Holdings After Transaction: Common Stock — 3,016,701 shares (Direct)

Footnotes (2)

1. F1. Acquisition from Issuer: Shares awarded under Long-Term Incentive Program adopted by Compensation Committee composed of three or more independent non-employee directors pursuant to the Company's 2023 Equity Incentive Plan approved by Compensation Committee and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3(d).
2. F2. Disposition to Issuer: Shares withheld by Issuer in payment of reporting person's withholding tax liability in connection with such person's receipt or vesting of an equity security, and either approved in advance by Compensation Committee or mandated by the express terms of the Plan and exempt from Section 16(b) of Exchange Act in accordance with Exchange Act Rule 16b-3(e).

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did STLD CEO Mark D. Millett report in this Form 4 filing?

Mark D. Millett reported an equity award and related tax withholding. He received 46,422 shares of STEEL DYNAMICS INC Common Stock and had 20,625 shares withheld by the company to satisfy tax obligations tied to this compensation-related grant.

How many STLD shares were granted to CEO Mark D. Millett?

Mark D. Millett was granted 46,422 shares of STEEL DYNAMICS INC Common Stock. The award was made at $0.00 per share under the company’s 2023 Equity Incentive Plan as part of its long-term incentive compensation program for executives.

Why were 20,625 STLD shares disposed of in this Form 4?

The 20,625 STEEL DYNAMICS INC shares were withheld by the company to cover Millett’s withholding tax liability. This tax-withholding disposition occurred in connection with his receipt or vesting of the equity award and was treated as a payment of tax obligations.

How many STEEL DYNAMICS INC shares does Mark D. Millett hold after these transactions?

After the reported grant and tax withholding, Mark D. Millett directly holds 3,016,701 shares of STEEL DYNAMICS INC Common Stock. This figure reflects his position following both the 46,422-share award and the 20,625-share tax-withholding disposition.

What plan governed the STLD equity award to CEO Mark D. Millett?

The equity award to Mark D. Millett was granted under STEEL DYNAMICS INC’s 2023 Equity Incentive Plan. The shares were awarded pursuant to a long-term incentive program approved by the Compensation Committee and stockholders, and structured to qualify for Section 16(b) exemptions.

Is the STLD CEO’s Form 4 transaction an open-market trade?

No, the Form 4 transactions are compensation-related, not open-market trades. The 46,422 shares were granted as an equity award, and the 20,625-share disposition reflects shares withheld by STEEL DYNAMICS INC solely to satisfy Millett’s tax liability on that award.

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Accepted by SEC EDGAR 03/13/2026 - 08:26 AM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MILLETT MARK D

(Last) (First) (Middle)

7575 W. JEFFERSON BLVD.

(Street)

FORT WAYNE IN 46804

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
STEEL DYNAMICS INC [ STLD ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman and CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/13/2026		A		46,422(1)	A	$0	3,037,326	D
Common Stock	03/13/2026		F		20,625(2)	D	$182.19	3,016,701	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Acquisition from Issuer: Shares awarded under Long-Term Incentive Program adopted by Compensation Committee composed of three or more independent non-employee directors pursuant to the Company's 2023 Equity Incentive Plan approved by Compensation Committee and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3(d).

2. Disposition to Issuer: Shares withheld by Issuer in payment of reporting person's withholding tax liability in connection with such person's receipt or vesting of an equity security, and either approved in advance by Compensation Committee or mandated by the express terms of the Plan and exempt from Section 16(b) of Exchange Act in accordance with Exchange Act Rule 16b-3(e).

	/s/ Mark D. Millett	03/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.