Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 128

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 128
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 0.21 | ​ | ​ | ​ | ​                          | ​ |       — | ​ | ​ | ​ | ​                     | ​ |     ​ | ​ | ​ | ​ | ​     | ​ |       ​ | ​ | ​ | ​ | ​         | ​ | ​ | ​                 | ​ |    0.21 | ​ | ​ |

See accompanying Notes to the Unaudited Pro Forma Condensed Combined Financial Information 83

TABLE OF CONTENTS

NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION Note 1: Basis of Presentation The proforma condensed combined financial information and explanatory notes have been prepared to illustrate the effects of the merger under the acquisition method of accounting with Old Second as the acquirer. The pro forma condensed combined financial information is presented for illustrative purposes only and does not necessarily indicate the financial condition or results of the combined companies had the companies actually been combined at the beginning of the periods presented, nor does it necessarily indicate the results of operations in future periods or the future financial position of the combined company. Under the acquisition method of accounting, the assets and liabilities of Bancorp Financial as of the effective date of the merger, will be recorded by Old Second at their respective fair values and the excess of the merger consideration over the fair value of Bancorp Financial’s net assets will be allocated to goodwill. The merger, which is currently expected to be completed in the third quarter of 2025, and is subject to the satisfaction of customary closing conditions, provides that Bancorp Financial stockholders will receive (a) $15.93 cash consideration for each share of Bancorp Financial common stock they hold immediately prior to the merger, and (b) 2.5814 shares of Old Second common stock for each share of Bancorp Financial common stock they hold immediately prior to the merger. The implied value of the stock consideration to Bancorp Financial stockholders is $42.64 per share, or a total of $133.8 million, based on the closing stock price of Old Second common stock of $16.52 per share as of March 14, 2025. The pro forma allocation of the purchase price presented in the pro forma condensed combined financial information is subject to adjustment and may vary from the actual purchase price allocation that will be recorded at the time the merger is consummated. Adjustments may include, but are not limited to, changes in (a) Bancorp Financial’s balance sheet and operating results through the effective