{"transactions":[{"id":886741,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65079,"kind":"person","name":"Kotche Keith","position":1,"cik":"0001896747","reported_name":"Kotche Keith","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-02-25T00:13:10.000Z","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":"0001896747-26-000002","document":"form4-02252026_120207.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000189674726000002/form4-02252026_120207.xml","form_type":"4"}},{"id":886740,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65079,"kind":"person","name":"Kotche Keith","position":1,"cik":"0001896747","reported_name":"Kotche Keith","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-02-25T00:13:10.000Z","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. 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These shares have a three-year cliff vesting."}],"balance_after":13672,"source":{"system":"sec-edgar","filing":"0001896747-26-000002","document":"form4-02252026_120207.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000189674726000002/form4-02252026_120207.xml","form_type":"4"}},{"id":1254388,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65079,"kind":"person","name":"Kotche Keith","position":1,"cik":"0001896747","reported_name":"Kotche Keith","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2025-02-21T21:12:16.000Z","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":"0001415889-25-005061","document":"form4-02212025_090211.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925005061/form4-02212025_090211.xml","form_type":"4"}},{"id":1627112,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65079,"kind":"person","name":"Kotche Keith","position":1,"cik":"0001896747","reported_name":"Kotche Keith","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 10,441 shares of Restricted Stock Units and 181,304 shares held with spouse."}],"balance_after":191745,"source":{"system":"sec-edgar","filing":"0001415889-24-004867","document":"form4-02222024_100243.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924004867/form4-02222024_100243.xml","form_type":"4"}},{"id":1663156,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65079,"kind":"person","name":"Kotche Keith","position":1,"cik":"0001896747","reported_name":"Kotche Keith","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Old Second Bancorp, Inc. 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These shares have a 3-year cliff vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 158,156 shares held at a broker and 6,157 shares of Restricted Stock Units."}],"balance_after":164313,"source":{"system":"sec-edgar","filing":"0001415889-23-003137","document":"form4-02232023_060234.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003137/form4-02232023_060234.xml","form_type":"4"}},{"id":2390433,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":65079,"kind":"person","name":"Kotche Keith","position":1,"cik":"0001896747","reported_name":"Kotche Keith","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Old Second Bancorp, Inc. 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