Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 243

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 243
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 as of the date hereof (the “ Company Voting Agreements ”), in the form attached hereto as Exhibit A ;

### WHEREAS
, for federal income tax purposes, it is intended that (i) the Merger shall qualify as a “reorganization” within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the “ Code ”), (ii) this Agreement is intended to be and is adopted as a “plan of reorganization” within the meaning of Section 1.368-2(g) of the regulations promulgated under the Code, and (iii) Buyer and Company will each be a “party to the reorganization” within the meaning of the Code;

### WHEREAS
, the Parties desire to make certain representations, warranties, covenants and agreements in connection with the Mergers and also prescribe certain conditions to the Mergers; and

### WHEREAS
, capitalized terms used in this Agreement and not otherwise defined herein are defined in Section 10.1(a) of this Agreement.

#### NOW, THEREFORE
, in consideration of the above and the mutual representations, warranties, covenants, and agreements set forth herein, and other good and valuable consideration, the receipt and sufficiency of which are acknowledged, the Parties, intending to be legally bound, agree as follows:

#### ARTICLE 1THE MERGER
1.1

#### Merger
. Subject to the terms and conditions of this Agreement, in accordance with the Delaware General Corporation Law (the “ DGCL ”) at the Effective Time, Company shall merge with and into Buyer pursuant to this Agreement. Buyer shall be the Surviving Entity in the Merger and shall continue its corporate existence under the Laws of the State of Delaware. Upon consummation of the Merger, the separate corporate existence of Company shall terminate.

1.2

#### Time and Place of Closing
. Subject to the terms and conditions of this Agreement, the closing of the Merger (the “ Closing ”) will take place by electronic exchange of documents at 10:00 a.m., Central time, on a date which shall be no later than five (5) business days after the satisfaction or waiver (subject to

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TABLE OF CONTENTS

applicable Law) of all of the conditions set forth in Article 8 hereof (other than those conditions that by their nature can only be satisfied at the Closing, but subject to the