Old Second Bancorp, Inc.
US ˙ NasdaqGS ˙ US6802771005

SecurityOSBC / Old Second Bancorp, Inc.
InstitutionShell Asset Management Co
Latest Disclosed Ownership2,033 shares
Latest Disclosed Value $ 35
Shell Asset Management Co reports 64.06% decrease in ownership of OSBC / Old Second Bancorp, Inc.

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 2,033 shares of Old Second Bancorp, Inc. (US:OSBC) valued at $35,140 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 5,657 shares of Old Second Bancorp, Inc.. The current value of the position is $42,083 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)
2025-11-07 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 2,033 -3,624 -64.06 0 0.0035
2025-07-23 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 5,657 -627 -9.98 0 0.0035
2025-05-14 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 6,284 -274 -4.18 0 0.0050
2025-02-14 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 6,558 -38 -0.58 0 0.0051
2024-11-07 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 6,596 -386 -5.53 0 0.0045
2024-07-25 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 6,982 -758 -9.79 0 0.0047
2024-02-14 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 7,740 -2,323 -23.08 0 0.0055
2023-11-08 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 10,063 -158 -1.55 0 0.0057
2023-07-28 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 10,221 -59 -0.57 0 0.0052
2023-05-15 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 10,280 -36 -0.35 0 0.0060
2023-02-07 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 10,316 -2,092 -16.86 0 -100.00 0.0072
2022-11-14 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 12,408 -3,251 -20.76 162 -22.86 0.0063
2022-08-09 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 15,659 28 0.18 210 -7.49 0.0062
2022-05-04 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 15,631 -2,313 -12.89 227 0.44 0.0054
2022-02-09 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 17,944 84 0.47 226 -3.00 0.0046
2021-11-04 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 17,860 -770 -4.13 233 0.87 0.0052
2021-08-12 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 18,630 -11,120 -37.38 231 -41.22 0.0045
2021-05-10 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 29,750 0 0.00 393 31.00 0.0079
2021-02-16 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 29,750 0 0.00 300 34.53 0.0062
2020-11-13 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 29,750 0 0.00 223 -3.46 0.0052
2020-08-10 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 29,750 -279 -0.93 231 11.06 0.0058
2020-05-11 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 30,029 -456 -1.50 208 -49.39 0.0058
2020-02-13 2019-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 30,485 -715 -2.29 411 7.87 0.0089
2019-11-12 2019-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 31,200 -267 -0.85 381 -5.22 0.0087
2019-08-12 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 31,467 -718 -2.23 402 -0.74 0.0089
2019-05-09 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 32,185 0 0.00 405 -3.11 0.0089
2019-02-13 2018-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 32,185 -2,700 -7.74 418 -22.45 0.0104
2018-11-13 2018-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 34,885 34,885 539 0.0106
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.