# EDGAR Filing Document

**Accession Number:** 0000357173
**File Stem:** 0000357173-25-000052
**Filing Date:** 2025-6
**Character Count:** 26982
**Document Hash:** f191a11f6e0da02b13f227c9cb3c0395
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000357173-25-000052.hdr.sgml**: 20250602

**ACCESSION NUMBER**: 0000357173-25-000052

**CONFORMED SUBMISSION TYPE**: S-8

**PUBLIC DOCUMENT COUNT**: 6

**FILED AS OF DATE**: 20250602

**DATE AS OF CHANGE**: 20250602

**EFFECTIVENESS DATE**: 20250602

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** OLD SECOND BANCORP INC
- **CENTRAL INDEX KEY:** 0000357173
- **STANDARD INDUSTRIAL CLASSIFICATION:** STATE COMMERCIAL BANKS [6022]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 363143493
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-8
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-287718
- **FILM NUMBER:** 251014570

**BUSINESS ADDRESS:**
- **STREET 1:** 37 S RIVER ST
- **CITY:** AURORA
- **STATE:** IL
- **ZIP:** 60507
- **BUSINESS PHONE:** 6308920202

**MAIL ADDRESS:**
- **STREET 1:** 37 SOUTH RIVER STREET
- **CITY:** AURORA
- **STATE:** IL
- **ZIP:** 60507

**As filed with the Securities and Exchange Commission on June 2, 2025**

**Registration No. 333-** 

------

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM S-8**

**REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933**

**OLD SECOND BANCORP, INC.**

(Exact name of registrant as specified in its charter)

---

| | |
|:---|:---|
| **Delaware** | **36-3143493**<br>|
| (State or other jurisdiction of<br>incorporation or organization)<br>| (I.R.S. Employer Identification No.)<br>|

---

 **37 South River Street**

**Aurora, Illinois 60507**<br> (Address of principal executive offices) (Zip Code)

**Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as Amended and Restated**

(Full title of the Plan)

![Graphic](tmb-20250602xs8001.jpg)

**James L. Eccher**

**Chairman, President and Chief Executive Officer**

**Old Second Bancorp, Inc.**

**37 South River Street**

**Aurora, Illinois 60507**

(Name and address of agent for service)

**(630) 892-0202**

(Telephone number, including area code, of agent for service)

![Graphic](tmb-20250602xs8001.jpg)

Copies to:

**J. Brennan Ryan**

**Brittany M. McIntosh**

**Nelson Mullins Riley & Scarborough, LLP**

**201 17th Street NW, Suite 1700** 

**Atlanta, Georgia 30363**

**Telephone: (404) 322-6000**

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ◻ | Accelerated filer  | ⌧ |
| Non-accelerated filer | ◻ | Smaller reporting company | ◻ |
|  |  | Emerging growth company | ◻ |

---

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ◻

------

**EXPLANATORY NOTE**

Old Second Bancorp, Inc. ("we," "our," "us," "Registrant" or the "Company") files this registration statement on Form S-8 in connection with the Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as amended and restated (the "Plan"). The additional shares relate to an additional 800,000 shares of our common stock, $1.00 par value per share (the "Common Stock"), added to the Plan as a result of the amendment and restatement of the Plan approved by our stockholders at our Annual Meeting of Stockholders on May 20, 2025, to increase the number of shares of common stock authorized for issuance under the plan by 800,000 shares, from 1,800,000 shares to 2,600,000 shares.

We previously filed a registration statement on (i) Form S-8 (File No. 333-231807) on May 29, 2019, with respect to the Plan (the "First Registration Statement"), covering 600,000 shares of our common stock authorized for issuance under the Plan and (ii) Form S-8 (File No. 333-258904) on August 18, 2021, with respect to the Plan, covering an additional 1,200,000 shares of our common stock authorized for issuance under the Plan (the "Second Registration Statement," and together with the First Registration Statement, the "Prior Registration Statements"). Each of the First Registration Statement and Second Registration Statement continues and remains effective as to those shares of Common Stock registered thereunder. Pursuant to General Instruction E to Form S-8, each of the First Registration Statement and the Second Registration Statement is incorporated by reference herein and made a part hereof, except as supplemented, amended or superseded by the information set forth below.

**PART II**

**ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.**

In addition to the Prior Registration Statements, the following documents filed with the U.S. Securities and Exchange Commission (the "Commission") by the Company are hereby incorporated in this Registration Statement by reference (in each case excluding any information furnished and not filed according to applicable rules, such as information furnished pursuant to Item 2.02 or Item 7.01 on any Current Report on Form 8-K):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The Company's Annual Report on [Form 10-K](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000155837025002383/tmb-20241231x10k.htm) for the year ended December 31, 2024 ;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. The Company's Quarterly Reports on [Form 10-Q](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000035/tmb-20250331x10q.htm) for the quarter ended March 31, 2025 ;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. The Company's Current Reports on Form 8-K filed with the Commission on [January 2, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000004/tmb-20250102x8k.htm) ; [January 21, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000008/tmb-20250121x8k.htm) ; [January 22, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000013/tmb-20250122x8k.htm) ; [February 25, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000018/tmb-20250224x8k.htm) ; [April 1, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000026/tmb-20250401x8k.htm) ; [April 15, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000029/tmb-20250415x8k.htm) ; [April 23, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000032/tmb-20250423x8k.htm) ; [May 20, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000038/tmb-20250520x8k.htm) ; [May 20, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000035717325000041/tmb-20250520x8k.htm) ; [May 22, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/357173/000035717325000044/tmb-20250522x8k.htm) ; and [May 28, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/357173/000035717325000048/tmb-20250523x8k.htm) (other than the portions of those documents not deemed to be filed)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The description of the Company's capital stock included as [Exhibit 4.5](https://www.sec.gov/Archives/edgar/data/357173/000155837025002383/tmb-20241231xex4d5.htm) to the Company's Annual Report on Form 10-K for the year ended December 31, 2024 and all amendments or reports filed for the purpose of updating such description.

All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended subsequent to the date of this Registration Statement (other than any such documents or portions thereof that are furnished and not deemed filed with the SEC), prior to the filing of a post-effective amendment which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in this Registration Statement and to be a part hereof from the date of filing of such documents.

Any statement contained in this Registration Statement or in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained or incorporated by reference herein or in any subsequently filed document which is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

------

**SIGNATURES**

**The Registrant:** Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Aurora, Illinois, on June 2, 2025.

**OLD SECOND BANCORP, INC.**<br> (Registrant)

---

| | |
|:---|:---|
| By: | /s/ JAMES L. ECCHER |
|  | Name: James L. Eccher |
|  | Title: Chairman, President and Chief Executive Officer |

---

KNOW ALL PERSONS BY THESE PRESENTS that each person whose signature appears below hereby constitutes and appoints James L. Eccher and Bradley S. Adams, and each of them singly, his or her true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments, including post-effective amendments, to this Registration Statement (any of which amendments may make such changes and additions to this Registration Statement as such attorneys-in-fact may deem necessary or appropriate) and to file the same, with all exhibits thereto, and any other documents that may be required in connection therewith, granting unto said attorneys-in-fact and agents full power and authority to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registration Statement has been signed below by the following persons in the capacities set forth below and on June 2, 2025:

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Signature** | **Title** |
| /s/ James L. Eccher | President, Chief Executive Officer and Chairman of the Board (principal executive officer) |
| James L. Eccher |  |
| /s/ Bradley S. Adams | Executive Vice President, Chief Financial Officer, and Chief Operating Officer<br>(principal financial and accounting officer) |
| Bradley S. Adams |  |
| /s/ Gary S. Collins | Vice Chairman of the Board, Director |
| Gary S. Collins |  |
| /s/ Edward R. Bonifas | Director |
| Edward R. Bonifas |  |
| /s/ Barry C. Finn | Director |
| Barry C. Finn |  |
| /s/ Dennis Klaeser | Director |
| Dennis Klaeser |  |

---

------

---

| | |
|:---|:---|
| /s/ Keith Kotche | Director |
| Keith Kotche |  |
| /s/ John Ladowicz | Director |
| John Ladowicz |  |
| /s/ Billy J. Lyons | Director |
| Billy J. Lyons |  |
| /s/ Hugh H. McLean | Director |
| Hugh H. McLean |  |
| /s/ Patti Temple Rocks | Director |
| Patti Temple Rocks |  |
| /s/ John Williams, Jr. | Director |
| John Williams, Jr. |  |
| /s/ Jill E. York | Director |
| Jill E. York |  |

---

------

**EXHIBIT INDEX**

---

| | |
|:---|:---|
| .7.<br>|  |
| **Exhibit<br>Number**<br>| **Description**<br>|
| 3.1<br>| [Restated Certificate of Incorporation of Old Second Bancorp, Inc. (incorporated by reference to Exhibit 3.1 of the Company's Annual Report on Form 10-K filed on March 11, 2016).](https://www.sec.gov/Archives/edgar/data/357173/000035717316000077/osbc-20151231ex31c86e17d.htm) |
| 3.2 | [Amendment to Restated Certificate of Incorporation of Old Second Bancorp, Inc. (incorporated by reference to Exhibit 3.1 of the Company's Current Report on Form 8-K filed on May 22, 2019).](https://www.sec.gov/Archives/edgar/data/357173/000035717319000031/osbc-20190522ex31171e0e5.htm) |
| 3.3 | [Certificate of Elimination Eliminating References to Series A Junior Participating Preferred Stock from the Restated Certificate of Incorporation, as Amended, of Old Second Bancorp. Inc. (incorporated by reference to Exhibit 3.1 of the Company's Current Report on Form 8-K filed on June 5, 2019).](https://www.sec.gov/Archives/edgar/data/357173/000035717319000038/osbc-20190605ex31a33fb45.htm) |
| 3.4 | [Amendment to Restated Certificate of Incorporation of Old Second Bancorp, Inc. (incorporated by reference to Exhibit 3.1 of the Company's Current Report on Form 8-K filed on May 28, 2025).](https://www.sec.gov/Archives/edgar/data/357173/000035717325000048/tmb-20250523xex3d1.htm) |
| 3.5 | [Bylaws of Old Second Bancorp, Inc. (incorporated by reference to Exhibit 3.1 of the Company's Quarterly Report on Form 10-Q filed on November 6, 2020).](https://www.sec.gov/Archives/edgar/data/357173/000035717320000071/osbc-20200930ex312efccd4.htm) |
| 4.1<br>| [Specimen Common Stock Certificate of Old Second Bancorp, Inc. (incorporated by reference to Exhibit 4.1 of the Company's Registration Statement on Form S-1 filed on January 17, 2014).](https://www.sec.gov/Archives/edgar/data/357173/000104746914000220/a2217390zex-4_1.htm) |
| 4.2 | [Form of 3.50% Fixed-to-Floating Subordinated Note due April 15, 2031 of Old Second Bancorp, Inc. (incorporated by reference to Exhibit 4.1 of the Company's Current Report on Form 8-K filed on April 7, 2021).](https://www.sec.gov/Archives/edgar/data/357173/000035717321000023/osbc-20210406ex4147f6e79.htm) |
| 4.3 | Restated Certificate of Incorporation, as amended (included as Exhibits [3.1](https://www.sec.gov/Archives/edgar/data/357173/000035717316000077/osbc-20151231ex31c86e17d.htm), [3.2](https://www.sec.gov/Archives/edgar/data/357173/000035717319000031/osbc-20190522ex31171e0e5.htm), [3.3](https://www.sec.gov/Archives/edgar/data/357173/000035717319000038/osbc-20190605ex31a33fb45.htm), and [3.4](https://www.sec.gov/Archives/edgar/data/357173/000035717325000048/tmb-20250523xex3d1.htm). |
| 4.4 | Bylaws (included as Exhibit [3.5](https://www.sec.gov/Archives/edgar/data/357173/000035717320000071/osbc-20200930ex312efccd4.htm#Exhibit:https://www.sec.gov/Archives/edgar/data/357173/000035717320000071/osbc-20200930ex312efccd4.htm)). |
| 4.5 | [Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as amended and restated (incorporated by reference to Appendix C to Old Second Bancorp, Inc.'s Definitive Proxy Statement filed on April 18, 2025).](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000357173/000155837025005000/tmb-20250520xdef14a.htm#Appendixc) |
| 5.1  | [Opinion of Nelson Mullins Riley & Scarborough, LLP regarding the validity of the securities to be issued.\*](tmb-20250602xex5d1.htm) |
| 23.1 | [Consent of Plante & Moran, PLLC.\*](tmb-20250602xex23d1.htm) |
| 23.2 | [Consent of Nelson Mullins Riley & Scarborough, LLP (included in Exhibit 5.1).](tmb-20250602xex5d1.htm) |
| 24.1 | [Power of Attorney (contained on the signature pages of this Registration Statement).](#Signatures) |
| 107 | [Filing Fee Table.](tmb-20250602xexfees.htm)<u>\*</u> |

---

&nbsp;&nbsp;&nbsp;&nbsp;\* Filed herewith.

------

## Exhibit 5.1

**Exhibit 5.1**

---

| | |
|:---|:---|
| ![Graphic](tmb-20250602xex5d1001.jpg)<br>| <br>**NELSON MULLINS RILEY & SCARBOROUGH LLP**<br>**ATTORNEYS AND COUNSELORS AT LAW** |
|  | 2 W. Washington Street<br>Suite 400<br>Greenville, SC 29601<br>T: (864)373-2300 F: (864) 373-2925<br>nelsonmullins.com |

---

June 2, 2025

Old Second Bancorp, Inc.

37 South River Street

Aurora, Illinois 60507

Re:Registration Statement on Form S-8

Ladies and Gentlemen:

We have acted as counsel to Old Second Bancorp, Inc. (the "Company") in connection with the preparation and filing of a Registration Statement on Form S-8 (the "Registration Statement") to be filed by the Company with the Securities and Exchange Commission (the "Commission") under the Securities Act of 1933, as amended (the "Securities Act"), covering the offering of up to 800,000 shares (the "Shares") of the Company's common stock, par value $1.00 per share, issuable by the Company under the Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as amended and restated through May 20, 2025 (the "Plan"). This opinion is furnished pursuant to the requirement of Item 601(b)(5) of Regulation S-K under the Securities Act.

We have examined corporate records, certificates of public officials and officers of the Company, and other documents and records as we have deemed necessary for purposes of this opinion. In our examination, we have assumed the completeness and authenticity of any document submitted to us as an original, the completeness and conformity to the originals of any document submitted to us as a copy, the authenticity of the originals of such copies, the genuineness of all signatures, and the legal capacity and mental competence of natural persons.

For purposes of this opinion, we have relied without any independent verification upon factual information supplied to us by the Company, on factual information included in the Company's filings with the Commission and on the Shares being reserved for future issuance under the Plan. We have assumed without investigation that there has been no relevant change or development between the dates as of which the information cited in the preceding sentences was given or filed and the date of this letter and that the information upon which we have relied is accurate and does not omit disclosure necessary to prevent such information from being misleading.

#### California \| Colorado \| District of Columbia \| Florida \| Georgia \| Illinois \| Maryland \| Massachusetts \| Minnesota

#### New York \| North Carolina \| Ohio \| Pennsylvania \| South Carolina \| Tennessee \| Texas \| Virginia \| West Virginia

------

Old Second Bancorp, Inc.

Based on the foregoing, assuming that the Shares are authorized and issued in accordance with the Plan and a valid award agreement entered into in accordance therewith, and that the Company has received the authorized consideration for the issuance of the Shares (in an amount not less than the par value thereof), we are of the opinion that the Shares, when issued and delivered as described in the Registration Statement, will be validly issued, fully paid, and nonassessable.

Our opinion expressed above is subject to the qualifications that we express no opinion as to the applicability of, compliance with, or effect of (i) any bankruptcy, insolvency, reorganization, fraudulent transfer, fraudulent conveyance, moratorium or other similar law affecting the enforcement of creditors' rights generally; (ii) general principals of equity (regardless of whether enforcement is considered in a proceeding in equity or at law); (iii) public policy considerations which may limit the rights of parties to obtain certain remedies; and (iv) any laws except the Delaware General Corporation Law. Our advice on any legal issue addressed in this letter represents our opinion as to how that issue would be resolved were it to be considered by the highest court in the jurisdiction which enacted such law. The manner in which any particular issue would be treated in any actual court case would depend in part on facts and circumstances particular to the case, and this letter is not intended to guarantee the outcome of any legal dispute which may arise in the future.

This opinion is being rendered to be effective as of the effective date of the Registration Statement, and we hereby consent to the filing of this opinion with the Commission as Exhibit 5.1 to the Registration Statement. This consent shall not be deemed to be an admission that this firm is within the category of persons whose consent is required under Section 7 of the Securities Act or the regulations promulgated pursuant to the Securities Act.

This opinion is limited to the laws of the State of Delaware and no opinion is expressed as to the laws of any other jurisdiction. We do not find it necessary for the purposes of this opinion, and accordingly we do not purport to cover herein, the application of the securities or "Blue Sky" laws of the various states to the issuance and sale of any of the Shares. This opinion is limited to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein.

Very Truly Yours,

/s/ Nelson Mullins Riley & Scarborough LLP

NELSON MULLINS RILEY & SCARBOROUGH LLP

------

## Exhibit 23.1

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We consent to the incorporation by reference in this Registration Statement on Form S-8 of Old Second Bancorp, Inc. of our report dated March 6, 2025 relating to the consolidated financial statements and effectiveness of internal control over financial reporting, appearing in the Annual Report on Form 10-K of Old Second Bancorp, Inc. for the year ended December 31, 2024.

/s/ Plante & Moran, PLLC

Chicago, Illinois

June 2, 2025

------

## Ex-Filing

**Exhibit 107**

**Calculation of Filing Fee Tables**

**Form S-8**

(Form Type)

**Old Second Bancorp, Inc.** 

(Exact Name of Registrant as Specified in its Charter)

**Table 1: Newly Registered and Carry Forward Securities**

---

| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | &nbsp;&nbsp;<br>Security Type | &nbsp;&nbsp;<br>Security Class <br>Title | &nbsp;&nbsp;<br>Fee Calculation or Carry Forward Rule | &nbsp;&nbsp;<br>Amount Registered | &nbsp;&nbsp;<br>Proposed Maximum Offering Price Per Unit | &nbsp;&nbsp;Maximum Aggregate Offering Price | &nbsp;&nbsp;Fee Rate | &nbsp;&nbsp;Amount of Registration Fee | &nbsp;&nbsp;Carry Forward Form Type | &nbsp;&nbsp;Carry Forward File Number | &nbsp;&nbsp;Carry Forward Initial Effective Date | &nbsp;&nbsp;Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward |
| &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** | &nbsp;&nbsp;**Newly Registered Securities** |
| &nbsp;&nbsp;**Fees to be Paid** | &nbsp;&nbsp;Equity | &nbsp;&nbsp;Common Stock, par value $1.00 per share | &nbsp;&nbsp;Rule 457(c) and Rule 457(h) | &nbsp;&nbsp;800000<sup>(1)</sup> | &nbsp;&nbsp;$16.63<sup>(2)</sup> | &nbsp;&nbsp;$13304000<sup>(2)</sup> | &nbsp;&nbsp;0.00015310 | &nbsp;&nbsp;$2036.84<sup>(3)</sup> | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** |
| &nbsp;&nbsp;**Fees Previously Paid** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** |  | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** | &nbsp;&nbsp;**-** |
| &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**Carry Forward Securities** |
| &nbsp;&nbsp;**Carry Forward Securities** | &nbsp;&nbsp;**N/A** | &nbsp;&nbsp;**N/A** | &nbsp;&nbsp;**N/A** | &nbsp;&nbsp;**N/A** |  | &nbsp;&nbsp;**N/A** |  |  | &nbsp;&nbsp;**N/A** | &nbsp;&nbsp;**N/A** | &nbsp;&nbsp;**N/A** | &nbsp;&nbsp;**N/A** |
|  | &nbsp;&nbsp;**Total Offering Amounts** | &nbsp;&nbsp;**Total Offering Amounts** |  |  |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>$2036.84</u> |  |  |  |  |
|  | &nbsp;&nbsp;**Total Fees Previously Paid** | &nbsp;&nbsp;**Total Fees Previously Paid** |  |  |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>0.00</u>  |  |  |  |  |
|  | &nbsp;&nbsp;**Total Fee Offsets** | &nbsp;&nbsp;**Total Fee Offsets** |  |  |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>0.00</u> |  |  |  |  |
|  |  |  | &nbsp;&nbsp;**Net Fee Due** |  |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>$2036.84</u> |  |  |  |  |

---

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Represents additional shares of common stock issuable under the Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as amended and restated through May 20, 2025. In addition to such shares, pursuant to Rule 416(a) under the Securities Act, this Registration Statement covers an undetermined number of shares of common stock of the registrant that may become issuable to prevent dilution from stock splits, stock dividends or similar transactions with respect to the shares registered hereunder.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) Estimated solely for the purpose of calculating the registration fee, in accordance with Rule 457(c) and Rule 457(h) under the Securities Act, on the average of the high and low prices for Old Second Bancorp, Inc.'s common stock on The NASDAQ Global Select Market on May 27, 2025, a date within five business days prior to filing this Registration Statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) Determined in accordance with Section 6(b) of the Securities Act at a rate equal to $153.10 per $1,000,000 of the proposed maximum aggregate offering price.

------