Exhibit 21.1

​

​

LIST OF SUBSIDIARIES

​

​

​

​	​	​	​	​
Subsidiaries of the Company	​	Incorporated Under Laws of	​	Percent Owned by the Company
Old Second National Bank	​	United States	​	100% of the common stock
Old Second Capital Trust II	​	State of Delaware	​	100% of the common stock
Old Second Affordable Housing Fund, L.L.C.	​	State of Illinois	​	Owned by Old Second National Bank
Station I, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 1, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 2, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 3, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 4, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 5, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 6, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 7, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 8, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 9, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 10, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 11, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 12, LLC	​	State of Illinois	​	Owned by Old Second National Bank
Melrose Holdings 13, LLC	​	State of Illinois	​	Owned by Old Second National Bank
River Street Advisors, LLC	​	State of Illinois	​	Owned by Old Second National Bank
West Suburban Insurance Services, Inc.	​	State of Illinois	​	Owned by Old Second National Bank

​