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^*

Eccher James

(Last)

(First)

(Middle)

37 S. RIVER ST.

(Street)

AURORA

60506

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
OLD SECOND BANCORP INC [ OSBC ]

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)
03/31/2006

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)
Old Second Bancorp Inc. Common Stock	03/31/2006	⁽¹⁾	J		2	A	⁽²⁾	501⁽²⁾	I	Profit Sharing Plan
Old Second Bancorp Inc. Common Stock	03/31/2006	⁽¹⁾	J		4	A	⁽³⁾	915⁽³⁾	I	401-K Plan
Old Second Bancorp Inc. Common Stock								488	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)
Employee Stock Option (Right to Buy	$31.34							12/20/2005	12/21/2015	Common Stock	12,000		12,000	D
Employee Stock Option (Right to Buy	$32.59							12/20/2005	12/21/2014	Common Stock	12,000		12,000	D
Employee Stock Option (Right to Buy)	$25.08							12/20/2005	12/16/2013	Common Stock	8,000⁽⁴⁾		8,000⁽⁴⁾	D
Employee Stock Option (Right to Buy)	$18.81							12/20/2005	12/17/2012	Common Stock	7,000⁽⁴⁾		7,000⁽⁴⁾	D
Employee Stock Option (Right to Buy	$14.74							12/20/2005	12/18/2011	Common Stock	6,666⁽⁵⁾		6,666⁽⁵⁾	D
Employee Stock Option (Right to Buy	$8.91							12/20/2005	12/19/2010	Common Stock	5,334⁽⁵⁾		5,334⁽⁵⁾	D
Employee Stock Option (Right to Buy	$10.46							12/20/2005	12/14/2009	Common Stock	4,800⁽⁵⁾		4,800⁽⁵⁾	D
Employee Stock Option (Right to Buy	$9.75							12/20/2005	12/08/2008	Common Stock	4,266⁽⁵⁾		4,266⁽⁵⁾	D
Employee Stock Option (Right to Buy	$11.35							12/20/2005	12/09/2007	Common Stock	2,666⁽⁶⁾		2,666⁽⁶⁾	D

Explanation of Responses:

1. Does not apply.

2. Of this total, 2 shares were allocated during the first quarter pursuant to the Old Second Bancorp Inc. Employees Profit Sharing Plan & Trust. Information provided herein is based on information provided by the Plan Trustee as of 03-31-06.

3. Of this total, 4 shares were allocated during the first quarter pursuant to the Old Second Bancorp Inc. Salary Savings Plan & Trust. Information provided herein is based on information provided by the Plan Trustee as of 03-31-06.

4. Restated for a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04.

5. Restated for a 4 for 3 stock split effected in the form of a stock dividend payable 6-24-02 and restated for a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04.

6. Restated for a 2 for 1 stock split effected in the form of a stock dividend payable 5-17-99, and restated for a 4 for 3 stock split effected in the form of a stock dividend payable 6-24-02 and restated for a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04.

	/s/ James Eccher	03/31/2006
	** 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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