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OSBC · Old Second Bancorp Inc

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$25.72 +0.04 (+0.16%) At close · Sep 4
Market Cap
$1.31B
Shares
50.88M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 185
Total Value: $905,551,803
Total Shares: 38,831,558
Showing 1–100 of 185 holdings by value · page 1 of 2

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 185 13F filers · Δ vs Mar 31, 2026
Top Holder
11.1%
Sep 2023 → Jun 2026 · range 10.6% – 11.6%
+0.1 pts
Top 5
32.5%
Sep 2023 → Jun 2026 · range 32.4% – 43.9%
+0.0 pts
Top 10
52.1%
Sep 2023 → Jun 2026 · range 52.1% – 62.0%
+0.1 pts
HHI
377
Sep 2023 → Jun 2026 · range 377 – 503
Broadly held−3

Quarterly Activity

vs Mar 31, 2026
New
20
Increased
78
Decreased
47
Sold Out
23
Unchanged
40
Holder count: -3
Institutional value: +18.9%
Shares held: +2.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 185
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 357173 CUSIP 680277100 13F (30d) 119 filings 119 filers Visit website Investor relations