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 2M 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)
Code V Amount (A) or (D) Price
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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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