OSBC · Nasdaq · CIK 0000357173

OLD SECOND BANCORP INC

OLD SECOND BANCORP INC’s most recent SEC filing in our snapshot is a Form 4/A filed on Oct 21, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $355.2M and net income of $80.3M, according to its XBRL data on EDGAR. Its EDGAR record lists 64 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$355.2M
Net income, FY2025
$80.3M
Form 4 filings on record, past 12 months
64

Company overview

Legal name (as filed)
OLD SECOND BANCORP INC
Ticker
OSBC
SEC Central Index Key (CIK)
0000357173
Industry (SIC)
State Commercial Banks (code 6022)
Business address
AURORA, IL
State or country of incorporation
DE
Fiscal year ends
December 31
SEC filer category
Large accelerated filer
Position in SEC ticker list
#2279 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from OLD SECOND BANCORP INC’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$105.2MFY2021$216.5MFY2022$292.0MFY2023$297.9MFY2024$355.2MFY2025
Net income
$20.0MFY2021$67.4MFY2022$91.7MFY2023$85.3MFY2024$80.3MFY2025
OSBC annual results
ItemFY2021
ended Dec 31, 2021		FY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$105.2M$216.5M$292.0M$297.9M$355.2M
Net income$20.0M$67.4M$91.7M$85.3M$80.3M
Diluted EPS$0.65$1.49$2.02$1.87$1.62
Total assets$6.2B$5.9B$5.7B$5.6B$6.9B
Cash and equivalents$752.1M$115.2M$100.1M$99.3M$124.0M

XBRL tags used: revenue = InterestAndDividendIncomeOperating; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashAndCashEquivalentsAtCarryingValue. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

OSBC latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Feb 26, 202610-KAnnual report· period Dec 31, 2025Document · Index
Aug 6, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Oct 21, 20268-KResults of operations· period Oct 21, 2026Document · Index
Apr 6, 2026DEF 14ADefinitive proxy statement· period May 19, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about OLD SECOND BANCORP INC, by form type:

4 ×164/A ×108-K ×7144 ×4SCHEDULE 13G ×1S-3ASR ×110-Q ×1
OSBC recent filings
FiledFormWhat it isOriginal
Oct 21, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 21, 20264Statement of changes in beneficial ownership (insider trade)· period May 11, 2021Document · Index
Oct 21, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 21, 20268-KResults of operations· period Oct 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 21, 2026Document · Index
Oct 20, 20268-KOther events· period Oct 20, 2026Document · Index
Oct 19, 20268-KDirector or officer change· period Oct 14, 2026Document · Index
Oct 8, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Oct 1, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 30, 2026Document · Index
Oct 1, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 30, 2026Document · Index
Oct 1, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 30, 2026Document · Index
Oct 1, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 30, 2026Document · Index
Oct 1, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 30, 2026Document · Index
Oct 1, 20268-KOther events· period Oct 1, 2026Document · Index
Sep 23, 2026144Notice of proposed sale of securitiesDocument · Index
Sep 23, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 23, 2026Document · Index
Sep 11, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 4, 2026Document · Index
Sep 8, 2026144Notice of proposed sale of securitiesDocument · Index
Sep 8, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 8, 2026Document · Index
Sep 8, 20264/AStatement of changes in beneficial ownership (insider trade)· period Sep 3, 2026Document · Index
Sep 3, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 2, 2026Document · Index
Sep 3, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 3, 2026Document · Index
Sep 2, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 18, 2026S-3ASRSimplified registration statementDocument · Index
Aug 13, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 12, 2026Document · Index
Aug 12, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 11, 2026Document · Index
Aug 11, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 11, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 10, 2026Document · Index
Aug 6, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 22, 20268-KResults of operations· period Jul 22, 2026Document · Index
Jul 21, 20268-KOther events· period Jul 21, 2026Document · Index
Jul 8, 20268-KDirector or officer change· period Jul 7, 2026Document · Index
Jul 2, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 30, 2026Document · Index
Jul 2, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 30, 2026Document · Index

Insider filing activity

64 Form 4 filings appear in OLD SECOND BANCORP INC’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0000357173 and XBRL company facts. OLD SECOND BANCORP INC on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.