{"transactions":[{"id":886749,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65081,"kind":"person","name":"Williams John JR","position":1,"cik":"0001895832","reported_name":"Williams John JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-02-25T00:34:36.000Z","date":"2026-02-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":3077,"price":20.57,"value":63293.89,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents shares vested upon the third anniversary of the date of grant previously reported and are now issued and added to the reporting person's common stock holdings outright."}],"balance_after":10595,"source":{"system":"sec-edgar","filing":"0001895832-26-000002","document":"form4-02252026_120232.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000189583226000002/form4-02252026_120232.xml","form_type":"4"}},{"id":886748,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65081,"kind":"person","name":"Williams John JR","position":1,"cik":"0001895832","reported_name":"Williams John JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-02-25T00:34:36.000Z","date":"2026-02-17","kind":"grant","planned":false,"acquired":true,"shares":3121,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares represent restricted stock units granted pursuant to the Old Second Bancorp, Inc. Long Term Incentive Plan. These shares have a three-year cliff vesting."}],"balance_after":13672,"source":{"system":"sec-edgar","filing":"0001895832-26-000002","document":"form4-02252026_120232.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000189583226000002/form4-02252026_120232.xml","form_type":"4"}},{"id":1254389,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65081,"kind":"person","name":"Williams John JR","position":1,"cik":"0001895832","reported_name":"Williams John JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2025-02-21T21:13:10.000Z","date":"2025-02-19","kind":"grant","planned":false,"acquired":true,"shares":3190,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 3,190 restricted stock units on the date of the grant. These shares are time-based restricted stock units that vest on the third anniversary of the grant date."}],"balance_after":10551,"source":{"system":"sec-edgar","filing":"0001415889-25-005064","document":"form4-02212025_090206.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925005064/form4-02212025_090206.xml","form_type":"4"}},{"id":1627117,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65081,"kind":"person","name":"Williams John JR","position":1,"cik":"0001895832","reported_name":"Williams John JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Old Second Bancorp, Inc. 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These shares are time-based restricted stock units that vest on the third anniversary of the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 20,548 shares held with a broker; 10,441 shares of Restricted Stock Units and 10,125 shares held with spouse."}],"balance_after":41114,"source":{"system":"sec-edgar","filing":"0001415889-24-004884","document":"form4-02222024_100217.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924004884/form4-02222024_100217.xml","form_type":"4"}},{"id":1921427,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65081,"kind":"person","name":"Williams John JR","position":1,"cik":"0001895832","reported_name":"Williams John JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Old Second Bancorp, Inc. 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Common Stock","published_at":"2023-02-23T20:02:38.000Z","date":"2023-02-21","kind":"grant","acquired":true,"shares":3077,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares represent Restricted Stock Units granted 2-21-23 pursuant to the Old Second Bancorp, Inc. 2019 Equity Incentive Plan. These shares have a 3-year cliff vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 13,147 shares held with a broker and 6,157 shares of Restricted Stock Units."}],"balance_after":19304,"source":{"system":"sec-edgar","filing":"0001415889-23-003154","document":"form4-02232023_080228.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003154/form4-02232023_080228.xml","form_type":"4"}},{"id":2390440,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65081,"kind":"person","name":"Williams John JR","position":1,"cik":"0001895832","reported_name":"Williams John JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Old Second Bancorp, Inc. 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