# Old Second Bancorp Inc: overview

OSBC · Nasdaq · CIK 357173 · [Financials](/sectors/financials.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/osbc.md) · [Financials](/companies/osbc/financials.md) · [Filings](/companies/osbc/filings.md) · [Insiders](/companies/osbc/insiders.md)

Revenue is not reported in this company’s XBRL financial statements.

## Last eight quarters

| Line item | Unit | Q3 FY2024 (2024-09-30) | Q4 FY2024 (2024-12-31) | Q1 FY2025 (2025-03-31) | Q2 FY2025 (2025-06-30) | Q3 FY2025 (2025-09-30) | Q4 FY2025 (2025-12-31) | Q1 FY2026 (2026-03-31) | Q2 FY2026 (2026-06-30) |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| Revenue | $m | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported |
| Gross margin | % | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported |
| Operating margin | % | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported |
| Net margin | % | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported |
| Diluted EPS | $ per share | [0.50](/filings/0000357173-25-000091.md) | not reported | [0.43](/filings/0000357173-26-000022.md) | [0.48](/filings/0000357173-26-000045.md) | [0.18](/filings/0000357173-25-000091.md) | not reported | [0.48](/filings/0000357173-26-000022.md) | [0.54](/filings/0000357173-26-000045.md) |
| Free cash flow | $m | [46.2 d](/filings/0000357173-25-000091.md) | [21.8 d](/filings/0001104659-26-020393.md) | [16.2](/filings/0000357173-26-000022.md) | [23.5 d](/filings/0000357173-26-000045.md) | [34.7 d](/filings/0000357173-25-000091.md) | [43.4 d](/filings/0001104659-26-020393.md) | [36.2](/filings/0000357173-26-000022.md) | [27.9 d](/filings/0000357173-26-000045.md) |

- Revenue. XBRL not reported.
- Gross margin (gross profit / revenue). XBRL not reported.
- Operating margin (operating income / revenue). XBRL not reported.
- Net margin (net income / revenue). XBRL Net income: us-gaap:NetIncomeLoss. Derived values: 12-month figure less the 9-month figure.
- Diluted EPS. XBRL Diluted EPS: us-gaap:EarningsPerShareDiluted.
- Free cash flow (operating cash flow − capital expenditure). XBRL Operating cash flow: us-gaap:NetCashProvidedByUsedInOperatingActivities; Capital expenditure: us-gaap:PaymentsToAcquirePropertyPlantAndEquipment. Derived values: 9-month figure less the 6-month figure; 12-month figure less the 9-month figure; 6-month figure less the 3-month figure.

## Last five fiscal years

| Line item | Unit | FY2021 (2021-12-31) | FY2022 (2022-12-31) | FY2023 (2023-12-31) | FY2024 (2024-12-31) | FY2025 (2025-12-31) |
| --- | --- | ---: | ---: | ---: | ---: | ---: |
| Revenue | $m | not reported | not reported | not reported | not reported | not reported |
| Gross margin | % | not reported | not reported | not reported | not reported | not reported |
| Operating margin | % | not reported | not reported | not reported | not reported | not reported |
| Net margin | % | not reported | not reported | not reported | not reported | not reported |
| Diluted EPS | $ per share | [0.65](/filings/0001558370-24-002688.md) | [1.49](/filings/0001558370-25-002383.md) | [2.02](/filings/0001104659-26-020393.md) | [1.87](/filings/0001104659-26-020393.md) | [1.62](/filings/0001104659-26-020393.md) |
| Free cash flow | $m | [29.0](/filings/0001558370-24-002688.md) | [93.0](/filings/0001558370-25-002383.md) | [104](/filings/0001104659-26-020393.md) | [121](/filings/0001104659-26-020393.md) | [118](/filings/0001104659-26-020393.md) |

- Revenue. XBRL not reported.
- Gross margin (gross profit / revenue). XBRL not reported.
- Operating margin (operating income / revenue). XBRL not reported.
- Net margin (net income / revenue). XBRL Net income: us-gaap:NetIncomeLoss.
- Diluted EPS. XBRL Diluted EPS: us-gaap:EarningsPerShareDiluted.
- Free cash flow (operating cash flow − capital expenditure). XBRL Operating cash flow: us-gaap:NetCashProvidedByUsedInOperatingActivities; Capital expenditure: us-gaap:PaymentsToAcquirePropertyPlantAndEquipment.

Each value links to the filing it came from. d marks a derived value. A ratio is not reported when any input is missing.

## Insider purchases and sales

The last 20 open-market transactions on Form 4 (codes P and S). Reported price is as stated on the form, not a market price. [All insider transactions](/companies/osbc/insiders.md)

None in coverage.

## Funds that report holding it

From each manager’s latest Form 13F, largest reported value first. Reported value is as filed: filing data, not a price. [All funds](/funds.md)

| Fund | Quarter ended | Reported value | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | --- | --- |
| [BlackRock, Inc.](/funds/2012383.md) | 2026-06-30 | $100.2m | 4,298,683 |  | Added +172,439 |
| [DIMENSIONAL FUND ADVISORS LP](/funds/354204.md) | 2026-06-30 | $58.3m | 2,498,671 |  | Added +109,809 |
| [VANGUARD CAPITAL MANAGEMENT LLC](/funds/2100119.md) | 2026-06-30 | $50.8m | 2,179,877 |  | Reduced −71,972 |
| [STATE STREET CORP](/funds/93751.md) | 2026-06-30 | $42.9m | 1,839,202 |  | Added +239,900 |
| [Davis Asset Management, L.P.](/funds/1945894.md) | 2026-06-30 | $42.0m | 1,800,000 |  | Unchanged |
| [AMERICAN CENTURY COMPANIES INC](/funds/748054.md) | 2026-06-30 | $41.6m | 1,783,820 |  | Added +192,877 |
| [GOLDMAN SACHS GROUP INC](/funds/886982.md) | 2026-06-30 | $37.9m | 1,624,852 |  | Reduced −66,671 |
| [FJ Capital Management LLC](/funds/1599170.md) | 2026-06-30 | $34.1m | 1,460,413 |  | Reduced −44,689 |
| [Boston Partners](/funds/1386060.md) | 2026-06-30 | $32.9m | 1,415,165 |  | Reduced −28,724 |
| [GEODE CAPITAL MANAGEMENT, LLC](/funds/1214717.md) | 2026-06-30 | $31.5m | 1,349,432 |  | Added +67,421 |

## Recent filings

[All 1,428 filings](/companies/osbc/filings.md)

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-21 | 20:05 ET | [8-K](/filings/0000357173-26-000057.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000357173-26-000057 |
| 2026-10-20 | 15:00 ET | [8-K](/filings/0000357173-26-000055.md) | 8.01 Other events | 0000357173-26-000055 |
| 2026-10-19 | 20:15 ET | [8-K](/filings/0000357173-26-000052.md) | 5.02 Departure or appointment of officers or directors | 0000357173-26-000052 |
| 2026-10-01 | 15:00 ET | [8-K](/filings/0000357173-26-000050.md) | 8.01 Other events | 0000357173-26-000050 |
| 2026-08-06 | 16:01 ET | [10-Q](/filings/0000357173-26-000045.md) | Quarterly report, period 2026-06-30 | 0000357173-26-000045 |
| 2026-07-22 | 20:05 ET | [8-K](/filings/0000357173-26-000042.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000357173-26-000042 |
| 2026-07-21 | 15:00 ET | [8-K](/filings/0000357173-26-000039.md) | 8.01 Other events | 0000357173-26-000039 |
| 2026-07-08 | 15:00 ET | [8-K](/filings/0000357173-26-000037.md) | 5.02 Departure or appointment of officers or directors | 0000357173-26-000037 |
| 2026-07-01 | 15:00 ET | [8-K](/filings/0000357173-26-000035.md) | 8.01 Other events | 0000357173-26-000035 |
| 2026-06-25 | 15:00 ET | [8-K](/filings/0000357173-26-000030.md) | 8.01 Other events | 0000357173-26-000030 |

## Latest annual report

[Form 10-K for the fiscal year ended Dec 31, 2025](/filings/0001104659-26-020393.md), filed Feb 26, 2026.

## Forecast league

Not in this season’s league. [This season’s league](/leagues.md)

## About the filer

- CIK: 357173
- Tickers: OSBC
- Exchange: Nasdaq
- SIC code: 6022 State Commercial Banks
- State of incorporation: DE
- Filer category: Large accelerated filer

Source: SEC EDGAR, XBRL company facts, the filing index and Forms 4. Last ingested by Listed: Oct 24, 2026, 15:22 ET. No prices; not investment advice.