Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,20 € ↑0,60 (3,41%)
2026-06-05
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionJpmorgan Chase & Co
Latest Disclosed Ownership700,953 shares
Latest Disclosed Value $ 13,913,918
Jpmorgan Chase & Co reports 18.38% decrease in ownership of OSB / Old Second Bancorp, Inc.

On May 13, 2026 - Jpmorgan Chase & Co filed a 13F-HR/A form disclosing ownership of 700,953 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $11,986,296 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 858,806 shares of Old Second Bancorp, Inc.. This represents a change in shares of -18.38% during the quarter. The current value of the position is $12,757,345 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)
2026-05-13 2026-03-31 13F/A-1 OLD SECOND BANCORP INC DEL COMMON 680277100 700,953 -157,853 -18.38 13,914 -16.92 0.0001
2026-05-13 2026-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 0 -100.00 0
2026-02-11 2025-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 858,806 78,805 10.10 16,747 24.21 0.0011
2025-11-26 2025-09-30 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 780,001 -69,867 -8.22 13,482 -10.57 0.0008
2025-11-07 2025-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 780,001 -69,867 13,482 0.0001
2025-08-12 2025-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 849,868 -102,022 -10.72 15,077 -4.82 0.0010
2025-05-12 2025-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 951,890 -117,500 -10.99 15,839 -16.69 0.0012
2025-02-12 2024-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 1,069,390 -32,244 -2.93 19,014 10.71 0.0014
2024-12-26 2024-09-30 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 1,101,634 153,187 16.15 17,174 22.27 0.0013
2024-11-08 2024-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 1,101,634 153,187 17,174 0.0013
2024-12-26 2024-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 948,447 -70,987 -6.96 14,046 -0.44 0.0012
2024-08-12 2024-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 948,447 -70,987 14,046 0.0012
2024-12-26 2024-03-31 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 1,019,434 49,672 5.12 14,109 -5.78 0.0012
2024-05-10 2024-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 1,019,434 49,672 14,109 0.0012
2024-12-26 2023-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 969,762 54,014 5.90 14,973 20.14 0.0014
2024-02-12 2023-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 969,762 54,014 14,973 0.0014
2023-11-14 2023-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 915,748 -80,800 -8.11 12,463 -4.23 0.0014
2023-08-11 2023-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 996,548 -50,485 -4.82 13,015 -11.60 0.0014
2023-05-18 2023-03-31 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 1,047,033 -14,782 -1.39 14,722 86,500.00 0.0018
2023-05-11 2023-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 1,014,579 -47,236 14,722 0.0002
2023-02-13 2022-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 1,061,815 231,045 27.81 17 -99.84 0.0022
2022-11-14 2022-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 830,770 427,544 106.03 10,842 100.96 0.0016
2022-08-11 2022-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 403,226 269,533 201.61 5,395 178.09 0.0008
2022-05-11 2022-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 133,693 60,965 83.83 1,940 112.02 0.0002
2022-02-11 2021-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 72,728 8,557 13.33 915 9.19 0.0001
2022-02-10 2021-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 72,728 8,557 915 0.0001
2021-11-12 2021-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 64,171 -24,293 -27.46 838 -23.54 0.0001
2021-08-12 2021-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 88,464 -45,747 -34.09 1,096 -38.18 0.0001
2021-05-12 2021-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 134,211 2,006 1.52 1,773 32.81 0.0002
2021-02-19 2020-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 132,205 56,960 75.70 1,335 135.45 0.0002
2021-02-11 2020-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 132,205 56,960 1,335 33.0155
2020-11-12 2020-09-30 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 75,245 -28,158 -27.23 567 -29.57 0.0001
2020-11-12 2020-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 75,245 567
2020-08-11 2020-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 103,403 -34,018 -24.75 805 -15.17 0.0002
2020-05-12 2020-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 137,421 15,228 12.46 949 -42.35 0.0002
2020-02-11 2019-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 122,193 27,858 29.53 1,646 42.76 0.0003
2019-11-12 2019-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 94,335 10,568 12.62 1,153 8.36 0.0002
2019-08-07 2019-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 83,767 -2,018 -2.35 1,064 -1.48 0.0002
2019-05-07 2019-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 85,785 68 0.08 1,080 -3.05 0.0002
2019-02-11 2018-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 85,717 -4,509 -5.00 1,114 -20.09 0.0003
2018-11-13 2018-09-30 13F/A-1 OLD SECOND BANCORP INC ILL COMMON 680277100 90,226 83,465 1,234.51 1,394 1,337.11 0.0003
2018-11-07 2018-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 90,226 83,465 1,394
2018-08-14 2018-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 6,761 936 16.07 97 19.75 0.0000
2018-05-10 2018-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 5,825 -3,806 -39.52 81 -38.17 0.0000
2018-02-13 2017-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 9,631 9,295 2,766.37 131 3,175.00 0.0000
2017-11-09 2017-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 336 -6,357 -94.98 4 -94.81 0.0000
2017-08-09 2017-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 6,693 -13,309 -66.54 77 -65.78 0.0000
2017-05-10 2017-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 20,002 -35,711 -64.10 225 -63.47 0.0001
2017-02-06 2016-12-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 55,713 55,713 0.00 616 0.0001
2016-11-04 2016-09-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 0 -631 -100.00 0 -100.00
2016-08-08 2016-06-30 13F OLD SECOND BANCORP INC ILL COMMON 680277100 631 -490 -43.71 4 -50.00 0.0000
2016-05-10 2016-03-31 13F OLD SECOND BANCORP INC ILL COMMON 680277100 1,121 1,121 8 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.