Old Second Bancorp, Inc.
US ˙ NasdaqGS ˙ US6802771005

SecurityOSBC / Old Second Bancorp, Inc.
InstitutionCwm, Llc
Latest Disclosed Ownership23,515 shares
Latest Disclosed Value $ 474,069
Cwm, Llc reports 2.37% decrease in ownership of OSBC / Old Second Bancorp, Inc.

On May 14, 2026 - Cwm, Llc filed a 13F-HR form disclosing ownership of 23,515 shares of Old Second Bancorp, Inc. (US:OSBC) valued at $474,062 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 24,085 shares of Old Second Bancorp, Inc.. The current value of the position is $486,760 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 23,515 -570 -2.37 474 0.0012
2026-01-26 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 24,085 -273 -1.12 0 0.0013
2025-10-15 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 24,358 4,907 25.23 0 0.0013
2025-07-25 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 19,451 -854 -4.21 0 0.0012
2025-05-01 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,305 10,559 108.34 0 0.0013
2025-02-04 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 9,746 1,780 22.34 0 0.0007
2024-10-08 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 7,966 2,123 36.33 0 0.0005
2024-07-10 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 5,843 -9,786 -62.61 0 0.0004
2024-04-05 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 15,629 236 1.53 0 0.0011
2024-02-01 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 15,393 47 0.31 0 0.0013
2023-10-11 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 15,346 4,305 38.99 0 0.0013
2023-08-03 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 11,041 -296 -2.61 0 0.0009
2023-05-01 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 11,337 0 0.00 0 0.0011
2023-02-01 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 11,337 14 0.12 0 -100.00 0.0013
2022-10-27 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 11,323 11,062 4,238.31 148 4,833.33 0.0012
2022-07-28 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 261 64 32.49 3 0.00 0.0000
2022-04-21 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 3 50.00 0.0000
2022-01-31 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-09-15 2021-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-07-29 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 2 0.0000
2021-09-15 2021-03-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-04-27 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 3 0.0000
2021-09-15 2020-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-01-27 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 2 0.0000
2021-09-15 2020-09-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2020-10-19 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 1 0.0000
2021-09-15 2020-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2020-07-22 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 2 0.0000
2021-09-15 2020-03-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2020-04-28 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 197 0 1 0.0000
2021-09-14 2019-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-09-14 2019-09-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-09-14 2019-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 0 0.00 2 0.00 0.0000
2021-09-02 2019-03-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 197 197 2 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.