Dennis L Klaeser Transfers Shares of OLD Second Bancorp Inc (OSBC) — SEC Form 4, Oct 20, 2026

This is an amended filing (Form 4/A) — it supersedes the original filed February 25, 2026.

SEC Form 4 · No Market Transaction

Other Transaction

Non-market transaction reported.

Reporting Owner

Dennis L Klaeser

Director

TXN 2026-02-21 · FILED 2026-10-20

Equity Position 18.3K sh 18,252 → 18,252

Filing Lag 167 business days late vs 2-day SEC deadline

Form 4 · Statement of Changes in Beneficial Ownership

OLD Second Bancorp Inc

OSBC CIK 0000357173

Reporting Owner

Name	Relationship
Dennis L Klaeser CIK 0001225765	Director

Dennis L Klaeser at OLD Second Bancorp Inc Full insider history

Bought (12 mo) —

Sold (12 mo) —

More from this insider at OLD Second Bancorp Inc

Non-Derivative Securities Transactions

Title	Date	Type	Shares	Price	Net Total	Post-Txn	Ownership
Restricted Stock UnitsF1	2026-02-21	J - Other	3,077 D	$0.00	—	10,595	Direct
Old Second Bancorp, Inc. Common StockF1	2026-02-21	J - Other	3,077 A	$0.00	—	7,657	Direct

Footnotes (1)

F1: Represents the settlement upon vesting of 3,077 restricted stock units into an equal number of shares of common stock. No shares were sold or withheld to satisfy taxes. This amendment corrects the original Form 4, which incorrectly reported the settlement using transaction code F. Show more

Institutional Holders

Largest by reported value

5%+ Holders · 13D/G 1 filer

Latest Schedule 13D/G per filer; stakes the filer reported closed are left out.

Other insiders at OLD Second Bancorp Inc

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