MILLETT MARK D

SEC source: 0001062993-22-021191 · form4.xml · nonDerivative · entry 4

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,815,691

F2 · kind: Deemded disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001062993-22-021191 · form4.xml · nonDerivative · entry 3

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,889,689

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Deemed Acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001062993-22-021191 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,815,691

F2 · kind: Deemded disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001062993-22-021191 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,861,939

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Deemed Acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001062993-22-009854 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · By grantor retained annuity trust

Disclosed balance after: 118,700

F1 · ownership.nature: On March 24, 2020, the reporting person contributed 150,000 shares of Steel Dynamics, Inc. common stock to a grantor retained annuity trust (GRAT), of which he is the sole trustee and annuitant, constituting a mere change in the form of beneficial ownership, exempt from both the reporting requirements of Section 16(a) and the short-swing profit recovery provisions of Section 16(b) by reason of Rule 16a-13, and entitled to deferred reporting on year-end Form 5. On April 4, 2022, the reporting person, as sole trustee and annuitant under the GRAT, received 12,000 shares of Steel Dynamics, Inc. common stock in partial satisfaction of the GRAT's continuing annuity obligation, constituting a mere change of beneficiary ownership, exempt from both the reporting requirements and short-swing profits provision pursuant to SEC Rule 16a-13. This report is voluntarily made.

SEC source: 0001062993-22-009854 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,815,691

SEC source: 0001062993-22-007820 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,803,691

F2 · shares: 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).

SEC source: 0001062993-22-007820 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,877,632

F1 · shares: 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 Amended and Restated 2015 Equity Incentive Plan approved by Compensation Committee and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3(d).

SEC source: 0001062993-22-005852 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,737,976

F1 · shares: Represents grant of restricted stock units equal to the same number of underlying shares, received as an award under the Issuer's equity incentive plan, for no consideration, and exempt from Section 16b by virtue of Rule 16b-3(d)(1) and (3). The restricted units vest over a four year period as follows: 1/3 on 2/24/2024, 1/3 on 2/24/2025 and the final 1/3 on 2/24/2026, following which settlement is to be made solely in the same number of shares of the Issuer's common stock shown in Column 4.

SEC source: 0001062993-22-001985 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,703,178

F2 · shares: Payment of withholding tax liability by issuer's withholding of securities incident to the reporting person's receipt or vesting of a security in accordance with Rule 16b-3.

SEC source: 0001062993-22-001985 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,719,687

F1 · shares: Shares awarded pursuant to 2018 Executive Incentive Compensation Plan approved by Board of Directors and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3 thereunder. One-third of shares granted vest on date of grant, on-third vest one year from grant, and final one-third vest two years from grant.

SEC source: 0001062993-21-013237 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,694,650

SEC source: 0001062993-21-011417 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,928,650

F2 · shares: Represents disposition to issuer to cover taxes payable upon issuance of shares reported in footnote (1), exempt pursuant to Rule 16b-3.

SEC source: 0001062993-21-011417 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,929,266

F1 · shares: Represents grant of restricted stock, in lieu of restricted stock units of reporting person's age, for no consideration, and exempt from Section 16(b) by virtue of Rule 16b-3(d)(1) and (3). subject, however, to a two year holding period.

SEC source: 0001062993-21-008460 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,927,887

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.87 to $66.53, inclusive. The reporting person undertakes to provide to Steel Dynamics, Inc., any security holder of Steel Dynamics, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4.

SEC source: 0001062993-21-008318 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,995,573

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.61 to $67.89, inclusive.

SEC source: 0001062993-21-008318 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,003,598

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.48 to $67.48, inclusive. The reporting person undertakes to provide to Steel Dynamics, Inc., any security holder of Steel Dynamics, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4.

SEC source: 0001062993-21-008063 · form4.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,172,324

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.31 to $71.44, inclusive.

SEC source: 0001062993-21-008063 · form4.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,179,702

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.30 to $71.30, inclusive. The reporting person undertakes to provide to Steel Dynamics, Inc., any security holder of Steel Dynamics, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4.

SEC source: 0001022671-21-000066 · edgar.xml · derivative · entry 16

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,424

Underlying: Common Stock · 57,546 shares

Expires 2030-02-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · kind: Exempt exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d).

SEC source: 0001022671-21-000066 · edgar.xml · derivative · entry 15

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,248

Underlying: Common Stock · 138,752 shares

Expires 2029-02-11

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · kind: Exempt exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d).

SEC source: 0001022671-21-000066 · edgar.xml · derivative · entry 14

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 185,000 shares

Expires 2028-02-15

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · kind: Exempt exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d).

SEC source: 0001022671-21-000066 · edgar.xml · derivative · entry 13

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 100,000 shares

Expires 2027-02-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · kind: Exempt exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d).

SEC source: 0001022671-21-000066 · edgar.xml · derivative · entry 12

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 56,000 shares

Expires 2026-02-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · kind: Exempt exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d).

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 10

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,327,887

F2 · shares: Deemed disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 9

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,385,433

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Deemed acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 8

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,327,887

F2 · shares: Deemed disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 7

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,466,639

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Deemed acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 6

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,327,887

F2 · shares: Deemed disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 5

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,512,887

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Deemed acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 4

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,327,887

F2 · shares: Deemed disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 3

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427,887

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Deemed acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,327,887

F2 · shares: Deemed disposition of underlying shares by Reporting Person to issuer upon cash-settled exercise of stock appreciation rights, approved in advance by a Committee comprised solely of two or more Non-Employee directors, exempt from Section 16(b) pursuant to Rule 16b-3(d) and Rule 16b-3e.

SEC source: 0001022671-21-000066 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,383,887

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Deemed acquisition of underlying shares from issuer by Reporting Person, upon exercise of stock appreciation rights granted in a transaction exempt from Section 16(b) pursuant to Rule 16b-3(d), approved in advance by a Committee comprised solely of two or more Non-Employee directors; also exempt pursuant to Rule 16b-6(b).

SEC source: 0001022671-21-000062 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,327,887

SEC source: 0001022671-21-000060 · edgar.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · By grantor retained annuity trust

Disclosed balance after: 130,700

F1 · ownership.nature: On March 24, 2020, the reporting person contributed 150,000 shares of Steel Dynamics, Inc. common stock to a grantor retained annuity trust (GRAT), of which he is the sole trustee and annuitant. constituting a mere change in the form of beneficial ownership, exempt from both the reporting requirements of Section 16(a) and the short-swing profit recovery provisions of Section 16(b) by reason of Rule 16a-13, and entitled to deferred reporting on year-end Form 5. On April 29, 2021, the reporting person, as sole trustee and annuitant under the GRAT, received 19,300 shares of Steel Dynamics, Inc. common stock in partial satisfaction of the GRAT's annuity obligation, constituting a mere change of beneficiary ownership, exempt from both the reporting requirements and short-swing profits provision pursuant to SEC Rule 16a-13. This report is voluntarily made.

SEC source: 0001022671-21-000060 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,330,887

SEC source: 0001022671-21-000041 · edgar.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,311,587

F2 · shares: 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).

SEC source: 0001022671-21-000041 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,384,021

F1 · shares: 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 Amended and Restated 2015 Equity Incentive Plan approved by Compensation Committee and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3(d).

SEC source: 0001022671-21-000032 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,304,606

F1 · shares: Represents grant of restricted stock units equal to the same number of underlying shares, received as an award under the Issuer's equity incentive plan, for no consideration, and exempt from Section 16b by virtue of Rule 16b-3(d)(1) and (3). The restricted units vest over a four year period as follows: 1/3 on 2/25/2023, 1/3 on 2/25/2024 and the final 1/3 on 2/25/2025, following which settlement is to be made solely in the same number of shares of the Issuer's common stock shown in Column 4.

SEC source: 0001022671-21-000023 · edgar.xml · derivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,828

Underlying: Common Stock · 77,828 shares

Expires 2031-02-24

F1 · security: Stock Appreciation Rights (SAR) Award Agreement approved on February 24, 2021, by Compensation Committee of the Company's Board of Directors, consisting of five non-employee independent diretors exempt pursuant to Rule 16b-3d.

F2 · derivative.exercise_price: Reflects the fair market value of underlying common stock on the grant date.

F3 · derivative.exercise_date: One-third (25,943) of the SARs are exercisable on or after 2/24/22, an additional 2,162 of the SARs become exercisable each month for the next 23 months and the balance of 2,159 become exercisable on 2/24/24. The SARs award expires on 2/24/2031.

SEC source: 0001022671-21-000016 · edgar.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,278,089

F2 · shares: Payment of withholding tax liability by issuer's withholding of securities incident to the reporting person's receipt or vesting of a security in accordance with Rule 16b-3.

SEC source: 0001022671-21-000016 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,295,958

F1 · shares: Shares awarded pursuant to 2018 Executive Incentive Compensation Plan approved by Board of Directors and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3 thereunder. One-third of shares granted vest on date of grant, one-third vest one year from grant, and final one-third vest two years from grant.

SEC source: 0001022671-20-000098 · edgar.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,255,397

F2 · shares: Represents disposition to issuer to cover taxes payable upon issuance of shares reported in footnote (1), exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001022671-20-000098 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,271,251

F1 · shares: Represents grant of restricted stock, in lieu of restricted stock units because of reporting person's retirement age, for no consideration, and exempt from Section 16(b) by virtue of Rule 16b-3(d)(1) and (3). subject, however, to the following holding periods: 1/3 on 11/21/2022, 1/3 on 11/21/2023, and the final 1/3 on 11/21/2024.

SEC source: 0001022671-20-000098 · edgar.xml · nonDerivative · entry 3

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · By grantor retained annuity trust

Disclosed balance after: 150,000

F3 · ownership.nature: On March 24, 2020, the reporting person contributed 150,000 shares of Steel Dynamics, Inc. common stock to a grantor retained annuity trust (GRAT), of which he is the sole trustee and annuitant. constituting a mere change in the form of beneficial ownership, exempt from both the reporting requirements of Section 16(a) and the short-swing profit recovery provisions of Section 16(b) by reason of Rule 16a-13, and entitled to deferred reporting on year-end Form 5. This report is voluntarily made earlier on this Form 4.

SEC source: 0001022671-20-000044 · edgar.xml · nonDerivative · entry 2

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,385,790

F2 · shares: 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).

SEC source: 0001022671-20-000044 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,441,253

F1 · shares: 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 2015 Equity Incentive Plan approved by Compensation Committee and Stockholders and exempt from Section 16(b) of Exchange Act pursuant to Rule 16b-3(d).

SEC source: 0001022671-20-000028 · edgar.xml · derivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 147,970

Underlying: Common Stock · 147,970 shares

Expires 2030-02-20

F1 · security: Stock Appreciation Rights (SAR) Award Agreement approved on February 20, 2020, by the Compensation Committee of the Company's Board of Directors, consisting of five non-employee independent directors, exempt pursuant to Rule 16b-3d.

F2 · derivative.exercise_price: Reflects the fair market value of underlying common stock on the grant date.

F3 · derivative.exercise_date: One-third (49,324) of the SARs are exercisable on or after 2/20/21, an additional 4,111 of the SARs become exercisable each month for the next 23 months, and the balance of 4,093 of the SARs become exercisable on 2/20/23. This SARs award expires on 2/20/2030.

SEC source: 0001022671-20-000025 · edgar.xml · nonDerivative · entry 1

MILLETT MARK D · CIK 0001195949 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,364,078