Company · Ownership research

OLD SECOND BANCORP INC OSBC

CIK 0000357173

Form 4 transactions dated Sep 1, 2023 to Sep 27, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 48 rows; the complete set is available through the API.

Insider filings on file run through 2026-09-11.

Insider purchases & sales

Purchased: $102.86K
Sold: $8.93M

Sep 1, 2023 – Sep 11, 2026
Available records · partial months are marked ·

202610 of 16 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2026-09-08	MCLEAN HUGH H Director	Sale	$640.77K 25,000 shares sold	15.59% sold Direct holding	▾
2026-09-04	COLLINS GARY S VICE CHAIRMAN · Director	Sale	$128.53K 5,000 shares sold	8.60% sold Indirect holding	▾
2026-09-02	Campbell Darin Patrick President, Powersports Lending · Director	Sale	$612.79K 24,000 shares sold	8.74% sold Direct holding	▾
2026-08-12	Eccher James CHAIRMAN AND CEO · Director	Sale10b5-1 footnote	$494.70K 19,313 shares sold	5.98% sold Direct holding	▾
2026-08-11	Eccher James CHAIRMAN AND CEO · Director	Sale10b5-1 footnote	$1.42M 55,687 shares sold	14.72% sold Direct holding	▾
2026-05-22	COLLINS GARY S VICE CHAIRMAN · Director	Sale	$108.13K 5,120 shares sold	8.09% sold Indirect holding	▾
2026-05-21	COLLINS GARY S VICE CHAIRMAN · Director	Sale	$211.20K 10,000 shares sold	13.65% sold Indirect holding	▾
2026-05-11	Lyons Billy J Jr. Director	Purchase	$501.60 24 shares bought	0.12% added Direct holding	▾
2026-05-11	Pilmer Donald EVP	Sale	$518.79K 25,000 shares sold	34.22% sold Direct holding	▾
2026-05-08	COLLINS GARY S VICE CHAIRMAN · Director	Sale	$212.40K 10,000 shares sold	24.92% sold Direct holding	▾

Showing 16 / 16 record groups in 2026. The complete set is available through the API.

OLD SECOND BANCORP INC · OSBC

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 16 of 16 purchase / sale groups and 30 of 48 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"OSBC","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.