OLD SECOND BANCORP INC — All Filings
1,000 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
All
10-K
10-K/A
10-K405
10-Q
10-Q/A
11-K
144
144/A
15-12G
25-NSE
3
4
4/A
424B1
424B2
424B3
424B4
424B5
425
5
8-A12G
8-A12G/A
8-K
8-K/A
ARS
CORRESP
D
DEF 14A
DEFA14A
EFFECT
FWP
NT 11-K
PRE 14A
S-1
S-1/A
S-3
S-3/A
S-4
S-4/A
S-8
SC 13D
SC 13G
SC 13G/A
SC TO-I
SC TO-I/A
SCHEDULE 13G/A
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| SCHEDULE 13G/A | — | 0000102909-26-002002 | Mar 27, 2026 | — |
| 4 | — | 0001184766-26-000008 | Mar 23, 2026 | Mar 20, 2026 |
| 4 | — | 0001598917-26-000006 | Mar 4, 2026 | Mar 2, 2026 |
| 4 | — | 0001184766-26-000006 | Mar 4, 2026 | Mar 2, 2026 |
| 4 | — | 0001673321-26-000006 | Mar 4, 2026 | Mar 2, 2026 |
| 4 | — | 0001840027-26-000008 | Mar 4, 2026 | Mar 2, 2026 |
| 4 | — | 0001314109-26-000006 | Mar 4, 2026 | Mar 2, 2026 |
| 8-K | 8-K | 0000357173-26-000014 | Mar 4, 2026 | — |
| 10-K | 10-K | 0001104659-26-020393 | Feb 26, 2026 | Dec 31, 2025 |
| 4 | — | 0001244438-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001895832-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001655300-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001184764-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001829064-26-000004 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001896747-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001225765-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001296986-26-000002 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001191044-26-000002 | Feb 24, 2026 | Feb 21, 2026 |
| 4 | — | 0001184766-26-000004 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001314109-26-000004 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001673321-26-000004 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001840027-26-000006 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0001598917-26-000004 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0002074132-26-000006 | Feb 24, 2026 | Feb 17, 2026 |
| 4 | — | 0002074132-26-000004 | Feb 19, 2026 | Feb 18, 2026 |
| 4 | — | 0002074132-26-000002 | Feb 18, 2026 | Feb 13, 2026 |
| 4 | — | 0001829064-26-000002 | Feb 10, 2026 | Feb 9, 2026 |
| 4 | — | 0001840027-26-000004 | Feb 5, 2026 | — |
| 8-K | 8-K | 0000357173-26-000012 | Jan 29, 2026 | — |
| 8-K | 8-K | 0000357173-26-000010 | Jan 21, 2026 | — |
| 8-K | 8-K | 0000357173-26-000007 | Jan 20, 2026 | — |
| 4 | — | 0001424453-26-000002 | Jan 16, 2026 | Jan 15, 2026 |
| 4 | — | 0001314109-26-000002 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | — | 0001184766-26-000002 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | — | 0001598917-26-000002 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | — | 0001673321-26-000002 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | — | 0001840027-26-000002 | Jan 5, 2026 | Dec 31, 2025 |
| 8-K | 8-K | 0000357173-26-000005 | Jan 2, 2026 | — |
| 4 | — | 0001424453-25-000006 | Dec 9, 2025 | — |
| 4 | — | 0001424453-25-000004 | Nov 26, 2025 | — |
| 4 | — | 0001829064-25-000004 | Nov 13, 2025 | Nov 10, 2025 |
| 4 | — | 0002074132-25-000002 | Nov 7, 2025 | Oct 30, 2025 |
| 10-Q | 10-Q | 0000357173-25-000091 | Nov 6, 2025 | Sep 30, 2025 |
| 8-K | 8-K | 0000357173-25-000088 | Oct 22, 2025 | — |
| 8-K | 8-K | 0000357173-25-000086 | Oct 21, 2025 | — |
| 4 | — | 0001314109-25-000004 | Oct 1, 2025 | Sep 30, 2025 |
| 4 | — | 0001598917-25-000004 | Oct 1, 2025 | Sep 30, 2025 |
| 4 | — | 0001184766-25-000004 | Oct 1, 2025 | Sep 30, 2025 |
| 4 | — | 0001673321-25-000004 | Oct 1, 2025 | Sep 30, 2025 |
| 4 | — | 0001840027-25-000004 | Oct 1, 2025 | Sep 30, 2025 |