Old Second Bancorp Inc.

The decrease was primarily due to a $10.3 million increase in interest expense due to a rise in deposit and borrowing balances from our acquisition of Bancorp Financial, a $17.2 million increase in provision for credit losses related to $13.2 million of day two valuations from our acquisition of Bancorp Financial and $6.5 million of provision expense, compared to $2.5 million in the prior linked quarter, related to loan growth as well as the impact of current period charge offs primarily in powersports and lease segments as well as a downgrade of one large commercial credit.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

The decreases to the current quarter s net income were partially offset by a $28.8 million increase in interest and dividend income, primarily due to an increase in loan income from the loan portfolio acquired from Bancorp Financial, a $2.2 million increase in noninterest income, and a $4.2 million decrease in provision for income taxes.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

The decreases in net income compared to the prior year like quarter were partially offset by a $28.0 million increase in interest and dividend income, a $2.5 million increase in noninterest income, and a $3.7 million decrease in provision for income taxes.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

Net interest and dividend income was $82.8 million for the third quarter of 2025, reflecting an increase of $18.5 million, or 28.9%, from the second quarter of 2025, and an increase of $22.2 million, or 36.6%, from the third quarter of 2024 .

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

On October 21, 2025, our Board of Directors declared a cash dividend of $0.07 per share of common stock, payable on November 10 , 2025, to stockholders of record as of October 31, 2025.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

Based on the strength of the balance sheet and resilient income statement trends, Old Second elected in this fourth quarter to increase the common dividend by 17%, as we continue to regularly deliver dividend growth commensurate with the bank s performance.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

We believe Old Second is well prepared for any economic environment and has the resources and momentum to focus on growth and additional strategic opportunities as they present themselves.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

We may continue to buy and sell strategically identified securities as opportunities arise.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

Examples of forward-looking statements include, but are not limited to, statements regarding the economic outlook, balance sheet growth, building capital, and statements regarding the anticipated strategic and financial benefits of our acquisition of Bancorp Financial, including integration progress and competitive positioning.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

Such forward-looking statements are subject to risks, uncertainties, and other factors, which could cause actual results to differ materially from future results expressed or implied by such forward-looking statements.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025

Additional risks and uncertainties are contained in the Risk Factors and forward-looking statements disclosure in our most recent Annual Report on Form 10-K, and Quarterly Reports on Form 10-Q.

SEC original ↗Old Second Bancorp Inc. — Earnings release (8-K exhibit)EX-99Oct 22, 2025