Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 400

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 400
---
 2025] (the “

#### Effective Date
”) by and between OLD SECOND BANCORP, INC. (hereinafter referred to as the “

#### Company
”) and DARIN CAMPBELL (hereinafter referred to as the “

#### Executive
”).

WHEREAS, the Executive will be employed by the Company in a key management capacity; and

WHEREAS, the Company recognizes that circumstances may arise in which a Change in Control may occur, thereby causing uncertainty of employment without regard to the competence or past contributions of the Executive, which uncertainty may result in the loss of valuable services of the Executive, and the parties wish to provide reasonable security to the Executive against changes in the employment relationship in the event of a Change in Control; and

WHEREAS, this Agreement is being entered into contemporaneously with that separate Employment Agreement (the “

#### Employment Agreement
”) by and between the Executive, the Company, and Old Second National Bank (the “

#### Bank
”).

NOW THEREFORE, in consideration of the foregoing and of the mutual covenants and agreements of the parties set forth in this Agreement, and of other good and valuable consideration including, but not limited to, the Executive’s continuing employment, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, agree as follows:

#### Section 1.   Term of Agreement
This Agreement will commence on the Effective Date and shall continue in effect until the first anniversary of the Effective Date (the “

#### Initial Term
”).

The term of this Agreement automatically shall be extended for one additional year at the end of the Initial Term, and then again after each successive one-year period thereafter (each such one-year period following the Initial Term a “

#### Successive Period
”). However, either party may terminate this Agreement at the end of the Initial Term, or at the end of any Successive Period thereafter, by giving the other party written notice of intent not to renew delivered at least ninety (90) calendar days prior to the end of such Initial Term or Successive Period. Except as otherwise provided, if such notice is properly delivered by either party, this Agreement, along with all corresponding rights, duties, and covenants, shall automatically expire at the end of the Initial Term or Successive Period then in progress.

In the event that a Change in Control (as defined in Paragraph 2.4 below) of the Company occurs during the Initial Term or any Successive Period