Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 20

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 20
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 the time of the Bancorp Financial special meeting or any adjournment or postponement thereof. Selected Comparative Per Share Data The following table sets forth selected per share data for (i) Old Second on a historical basis, (ii) Bancorp Financial on a historical basis, (iii) the pro forma combined company, and (iv) the equivalent pro forma per share data for one share of Bancorp Financial common stock, giving effect to the merger. The unaudited pro forma combined per share data give effect to the merger as if it had occurred on January 1, 2024 for the income statement data and on December 31, 2024 for the balance sheet data. The unaudited pro forma combined per share data are derived from the unaudited pro forma combined financial information included elsewhere in this proxy statement/prospectus and are presented for illustrative purposes only. The equivalent pro forma per share data for Bancorp Financial common stock are calculated by multiplying the Old Second pro forma per share amounts by the exchange ratio of 2.5814. The pro forma combined per share data do not reflect the costs of integrating the companies or the benefits that may result from synergies, cost savings, or revenue enhancements associated with the merger. The actual results may differ materially from the pro forma information set forth below. You should read the following data in conjunction with (i) the historical consolidated financial statements and related notes of Bancorp Financial included elsewhere in this proxy statement/prospectus, (ii) the unaudited pro forma combined financial information included elsewhere in this proxy statement/ prospectus, and (iii) the historical consolidated financial statements and related notes of Old Second, which are incorporated by reference into this proxy statement/prospectus.

| (Comparative Per Share Data) 
 Book value per share         | ​ 
 ​ | ​ 
 ​ | OldSecondHistorical 
 ​                   | ​ |     ​ | ​ | ​ 
 ​ | ​ 
 ​ | BancorpFinancialHistorical 
 ​                          | ​ |     ​ | ​ | ​ 
 ​ | ​ 
 ​ | ProformaCombined 
 ​                | ​ |     ​ | ​ | ​ 
 ​ | ​ 
 ​ | EquivalentPro FormaPer Share ofBancorpFinancial(1) 
 ​                                                  | ​ |     ​ | ​ | ​ 
 ​ |
|:-----------------------------|:--|:--|:--------------------|:--|------:|:--|:--|:--|:---------------------------|:--|------:|