SEC FORM 4

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

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

1. Name and Address of Reporting Person^*

KOLB JURGEN DR

(Last)

(First)

(Middle)

ILSENSTEINWEG 23

(Street)

BERLIN-ZEHLENDORF GERMANY

14129

(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
	Officer (give title below)	Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/28/2007

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	09/28/2007		M⁽²⁾		1,186	A	$12.66	3,186⁽¹⁾	D
Common Stock	09/28/2007		M⁽²⁾		796	A	$18.86	3,982⁽¹⁾	D
Common Stock	09/28/2007		M⁽²⁾		1,072	A	$14	5,054⁽¹⁾	D
Common Stock	09/28/2007		M⁽²⁾		962	A	$15.62	6,016⁽¹⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Non-Employee Director Stock Option (right to buy)	$12.66	09/28/2007		M⁽³⁾			1,186	11/21/2004	05/21/2009	Common Stock	1,186	$0	0	D
Non-Employee Director Stock Option (right to buy)	$18.86	09/28/2007		M⁽³⁾			796	05/21/2005	11/21/2009	Common Stock	796	$0	0	D
Non-Employee Director Stock Option (right to buy)	$14	09/28/2007		M⁽³⁾			1,072	11/21/2005	05/21/2010	Common Stock	1,072	$0	0	D
Non-Employee Director Stock Option (right to buy)	$15.62	09/28/2007		M⁽³⁾			962	05/21/2006	11/21/2010	Common Stock	962	$0	0	D

Explanation of Responses:

1. Number of shares shown and price per share reflect 2:1 stock split effective 11/21/2006.

2. Acquisition of stock pursuant to exercise of option, granted pursuant to Non-Employee Director Stock Option Plan approved by stockholders, exempt under Rule 16b-6(b).

3. Exercise of stock option exempt under Rule 16b-3(e).

Remarks:

	Jurgen Kolb	10/02/2007
	** 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).
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