OLD SECOND BANCORP INC — Director's Dealing 2011

Jan 4, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLD SECOND BANCORP INC (OSBC)
CIK: 0000357173
Period of Report: 2010-12-31

Reporting Person: CHEATHAM J DOUGLAS (Director, CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-12-31	Old Second Bancorp Inc.	A	1837	—	Acquired	16404	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Old Second Bancorp Inc.	4192	Indirect
Old Second Bancorp Inc.	32592	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Employee Stock Option (Right to Buy	$27.75	2017-12-18	Common Stock (15000)	15000	Direct
Employee Stock Option (Right to Buy	$29.20	2016-12-19	Common Stock (12000)	12000	Direct
Employee Stock Option (Right to Buy	$31.34	2015-12-21	Common Stock (12000)	12000	Direct
Employee Stock Option (Right to Buy	$32.59	2014-12-21	Common Stock (12000)	12000	Direct
Employee Stock Option (Right to Buy)	$25.08	2013-12-16	Common Stock (12000)	12000	Direct
Employee Stock Option (Right to Buy)	$18.81	2012-12-17	Common Stock (12000)	12000	Direct
Employee Stock Option (Right to Buy	$14.74	2011-12-19	Common Stock (10666)	10666	Direct

Footnotes

F1: Does not apply.

F2: Of this total, 1837 shares were allocated during the second quarter pursuant to the Old Second Bancorp Inc. Salary Savings Plan. Information provided herein is based on information provided by the Plan Trustee as of 12-31-10.

F3: Included in this total are 31,192 shares of restricted stock and 1,400 shares in Mr. Cheatham's name only.

F4: Shares restated for a 2 for 1 stock split effected in the form of a stock dividend and payable 7-28-04.

F5: Shares restated for a 4 for 3 stock split effected in the form of a stock dividend and payable 6-24-02 and restated for a 2 for 1 stock split effected in the form of a stock dividend and payable 7-28-04.