Billy J. Lyons Jr. Reports Acquisition of Old Second Bancorp, Inc. Common Stock

Billy J. Lyons Jr., a director of Old Second Bancorp, Inc., reported the acquisition of 25 shares of the company's common stock on August 4, 2025. The transaction was priced at $16.61 per share, resulting in a total value of $415.25. Following this transaction, Lyons owns a total of 16,946 shares of Old Second Bancorp, Inc. common stock, including 8,353 shares held outright and 8,593 shares held in a brokerage account. This filing, submitted on August 5, 2025, provides transparency into the ownership and transactions of the company's directors.