OSBC SEC Filings: 8-K, 10-Q, S-3 & 424B

Financials

TYPE

HEADLINE

FILED AT

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 4, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 6, 2026

11-K

Form 11-K - Annual report of employee stock purchase, savings and similar plans

Jun 29, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

May 7, 2026

10-K

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]

Feb 26, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 6, 2025

News

TYPE

HEADLINE

FILED AT

8-K

Old Second Bancorp, Inc. Reports Third Quarter 2026 Net Income of $28.9 Million

Oct 21, 2026

8-K

Old Second Bancorp, Inc. Declares Cash Dividend of $0.08 Per Share

Oct 20, 2026

8-K

Gary Collins, Vice Chairman of Old Second Bancorp, Announces Retirement

Oct 19, 2026

8-K

Old Second Bancorp, Inc. Announces Third Quarter 2026 Financial Results Release and Conference Call Dates

Oct 1, 2026

8-K

Old Second Bancorp, Inc. Reports Second Quarter 2026 Net Income of $28.2 Million

Jul 22, 2026

8-K

Old Second Bancorp, Inc. Declares Quarterly Cash Dividend

Jul 21, 2026

Prospectus

TYPE

HEADLINE

FILED AT

424B3

UPDATED | SHARE RESALE REGISTRATION

May 15, 2025

424B3

UPDATED | SHARE RESALE REGISTRATION

May 8, 2025

425

Form 425 - Prospectuses and communications, business combinations

Feb 25, 2025

425

Form 425 - Prospectuses and communications, business combinations

Feb 25, 2025

424B3

How Holders of West Suburban Common Stock Can Exercise and Perfect the Right to Dissent-

Oct 25, 2021

425

Form 425 - Prospectuses and communications, business combinations

Oct 20, 2021

Registrations

TYPE

HEADLINE

FILED AT

S-3ASR

August 2026 SHELF

Aug 18, 2026

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

Jun 2, 2025

S-4/A

Form S-4/A - Registration of securities, business combinations: [Amend]

May 6, 2025

S-4

Form S-4 - Registration of securities, business combinations

Apr 23, 2025

S-3/A

SHELF | Offering amount: $200,000,000.00

Aug 24, 2023

S-3

SHELF | Offering amount: $200,000,000.00

Aug 18, 2023

Proxies

TYPE

HEADLINE

FILED AT

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Apr 6, 2026

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 6, 2026

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 18, 2025

PRE 14A

Form PRE 14A - Other preliminary proxy statements

Apr 1, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 19, 2024

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 14, 2023

Ownerships

TYPE

HEADLINE

FILED AT

SCHEDULE 13G

VANGUARD CAPITAL MANAGEMENT LLC (Filed by)

Oct 30, 2026

YORK JILL E (Reporting)

Oct 21, 2026

4/A

YORK JILL E (Reporting)

Oct 21, 2026

4/A

Williams John JR (Reporting)

Oct 21, 2026

4/A

Temple Rocks Patti (Reporting)

Oct 20, 2026

4/A

MCLEAN HUGH H (Reporting)

Oct 20, 2026

Other

TYPE

HEADLINE

FILED AT

EFFECT

Form EFFECT - Notice of Effectiveness

May 9, 2025

CORRESP

Form CORRESP - Correspondence

May 6, 2025

LETTER

Form UPLOAD - SEC-generated letter

May 1, 2025

EFFECT

Form EFFECT - Notice of Effectiveness

Aug 29, 2023

CORRESP

Form CORRESP - Correspondence

Aug 24, 2023

LETTER

Form UPLOAD - SEC-generated letter

Aug 23, 2023

Old Second Bancorp, Inc. OSBC · SEC Filings