Old Second Bancorp, Inc. (OSBC) Institutional Ownership & Insider Trading

184 institutions reported holding Old Second Bancorp, Inc. shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 24 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

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Market cap: 1.2B
P/E TTM: 13.9
Dividend yield: 1.1%
52-week: —
Next earnings: 19 Jan, in 87 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

184 institutions held 76.3% of the shares. Across filers that reported both quarters, shares held changed +2.9%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	184	39	+2.9%	66	18	43	17
Mar 26	188	38	+0.9%	51	17	58	15
Dec 25	181	37	+0.5%	58	16	51	29
Sep 25	195	37	+12.9%	74	27	46	16
Jun 25	182	33	-0.7%	62	13	61	21
Mar 25	192	33	+1.8%	49	22	67	8
Dec 24	177	32	-2.3%	65	18	36	18
Sep 24	173	32	+1.8%	55	29	49	9

Old Second Bancorp, Inc. — questions

Who owns Old Second Bancorp, Inc. stock?: 184 institutions reported Old Second Bancorp, Inc. shares in 13F filings for the quarter ended 2026-06-30. The largest: BlackRock, Inc. (8.4%), DIMENSIONAL FUND ADVISORS LP (4.9%), VANGUARD CAPITAL MANAGEMENT LLC (4.3%).
Are Old Second Bancorp, Inc. insiders buying or selling?: 24 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from Old Second Bancorp, Inc.'s own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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