Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,20 € ↑0,60 (3,41%)
2026-06-05
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionKennedy Capital Management, Inc.
Latest Disclosed Ownership1,268,490 shares
Latest Disclosed Value $ 25,572,758
Kennedy Capital Management, Inc. reports 0.11% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 13, 2026 - Kennedy Capital Management, Inc. filed a 13F-HR form disclosing ownership of 1,268,490 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $21,691,179 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,267,042 shares of Old Second Bancorp, Inc.. This represents a change in shares of 0.11% during the quarter. The current value of the position is $23,086,518 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 Old Second Bancorp COM 680277100 1,268,490 1,448 0.11 25,573 3.50 0.5416
2026-02-13 2025-12-31 13F Old Second Bancorp COM 680277100 1,267,042 173,724 15.89 24,707 30.74 0.5233
2025-11-13 2025-09-30 13F Old Second Bancorp COM 680277100 1,093,318 96,326 9.66 18,898 6.85 0.4177
2025-08-13 2025-06-30 13F Old Second Bancorp COM 680277100 996,992 481,302 93.33 17,687 106.11 0.4216
2025-05-13 2025-03-31 13F Old Second Bancorp COM 680277100 515,690 -238,703 -31.64 8,581 -36.02 0.2050
2025-02-13 2024-12-31 13F Old Second Bancorp COM 680277100 754,393 -14,109 -1.84 13,413 11.96 0.2979
2024-11-14 2024-09-30 13F Old Second Bancorp COM 680277100 768,502 314,927 69.43 11,981 78.35 0.2645
2024-08-14 2024-06-30 13F OLD SECOND BANCORP COM 680277100 453,575 -50,568 -10.03 6,717 -3.73 0.1436
2024-05-15 2024-03-31 13F Old Second Bancorp COM 680277100 504,143 -87,481 -14.79 6,977 -23.62 0.1436
2024-02-14 2023-12-31 13F Old Second Bancorp COM 680277100 591,624 -56,833 -8.76 9,135 3.50 0.1995
2023-11-14 2023-09-30 13F Old Second Bancorp COM 680277100 648,457 -37,332 -5.44 8,826 -1.46 0.2151
2023-08-14 2023-06-30 13F Old Second Bancorp COM 680277100 685,789 -29,702 -4.15 8,956 -10.97 0.2088
2023-05-15 2023-03-31 13F OLD SECOND BANCORP COM 680277100 715,491 26,066 3.78 10,060 -9.03 0.2959
2023-02-14 2022-12-31 13F OLD SECOND BANCORP COM 680277100 689,425 -7,059 -1.01 11,058 21.66 0.3122
2022-11-14 2022-09-30 13F OLD SECOND BANCORP COM 680277100 696,484 111,294 19.02 9,089 16.08 0.2675
2022-08-10 2022-06-30 13F OLD SECOND BANCORP COM 680277100 585,190 50,765 9.50 7,830 0.97 0.2194
2022-05-16 2022-03-31 13F OLD SECOND BANCORP COM 680277100 534,425 -3,291 -0.61 7,755 14.55 0.1835
2022-02-14 2021-12-31 13F OLD SECOND BANCORP COM 680277100 537,716 -9,963 -1.82 6,770 -5.35 0.1427
2021-11-15 2021-09-30 13F OLD SECOND BANCORP COM 680277100 547,679 -18,972 -3.35 7,153 1.81 0.1602
2021-08-16 2021-06-30 13F OLD SECOND BANCORP COM 680277100 566,651 -4,187 -0.73 7,026 -6.83 0.1510
2021-05-14 2021-03-31 13F OLD SECOND BANCORP COM 680277100 570,838 -3,697 -0.64 7,541 29.95 0.1518
2021-02-12 2020-12-31 13F OLD SECOND BANCORP COM 680277100 574,535 52,134 9.98 5,803 48.22 0.1311
2020-11-16 2020-09-30 13F OLD SECOND BANCORP COM 680277100 522,401 -2,491 -0.47 3,915 -4.14 0.1121
2020-08-14 2020-06-30 13F OLD SECOND BANCORP COM 680277100 524,892 9,357 1.82 4,084 14.65 0.1182
2020-05-15 2020-03-31 13F OLD SECOND BANCORP COM 680277100 515,535 41,058 8.65 3,562 -44.27 0.1310
2020-02-28 2019-12-31 13F/A-1 OLD SECOND BANCORP COM 680277100 474,477 -9,360 -1.93 6,391 8.10 0.1561
2020-02-14 2019-12-31 13F OLD SECOND BANCORP COM 680277100 474,477 -9,360 6,391 156,147.8418
2019-11-14 2019-09-30 13F OLD SECOND BANCORP COM 680277100 483,837 -23,890 -4.71 5,912 -8.82 0.1467
2019-08-14 2019-06-30 13F OLD SECOND BANCORP COM 680277100 507,727 -2,223 -0.44 6,484 1.00 0.1540
2019-05-13 2019-03-31 13F/A-1 OLD SECOND BANCORP COM 680277100 509,950 57,991 12.83 6,420 9.28 0.1515
2019-05-13 2019-03-31 13F OLD SECOND BANCORP COM 680277100 509,950 57,991 6,420
2019-02-12 2018-12-31 13F OLD SECOND BANCORP COM 680277100 451,959 104,163 29.95 5,875 9.34 0.1459
2018-11-14 2018-09-30 13F OLD SECOND BANCORP COM 680277100 347,796 -2,466 -0.70 5,373 6.52 0.1000
2018-08-14 2018-06-30 13F OLD SECOND BANCORP COM 680277100 350,262 117,502 50.48 5,044 55.92 0.0940
2018-05-14 2018-03-31 13F OLD SECOND BANCORP COM 680277100 232,760 220,612 1,816.04 3,235 1,848.80 0.0630
2018-02-13 2017-12-31 13F OLD SECOND BANCORP COM 680277100 12,148 -208,984 -94.51 166 -93.33 0.0030
2017-05-12 2017-03-31 13F OLD SECOND BANCORP COM 680277100 221,132 -27,439 -11.04 2,488 -9.43 0.0435
2017-02-14 2016-12-31 13F OLD SECOND BANCORP COM 680277100 248,571 -144,725 -36.80 2,747 -15.94 0.0478
2016-11-14 2016-09-30 13F OLD SECOND BANCORP COM 680277100 393,296 -58,156 -12.88 3,268 6.00 0.0627
2016-08-12 2016-06-30 13F OLD SECOND BANCORP COM 680277100 451,452 6,048 1.36 3,083 -3.48 0.0623
2016-05-13 2016-03-31 13F OLD SECOND BANCORP COM 680277100 445,404 -4,305 -0.96 3,194 -9.42 0.0649
2016-02-12 2015-12-31 13F OLD SECOND BANCORP COM 680277100 449,709 33,688 8.10 3,526 36.03 0.0714
2015-11-12 2015-09-30 13F OLD SECOND BANCORP COM 680277100 416,021 -1,833 -0.44 2,592 -6.02 0.0531
2015-08-14 2015-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 417,854 -3,010 -0.72 2,758 14.58 0.0495
2015-05-07 2015-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 420,864 -529 -0.13 2,407 6.36 0.0422
2015-02-13 2014-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 421,393 77,463 22.52 2,263 36.82 0.0416
2014-11-14 2014-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 343,930 901 0.26 1,654 -2.99 0.0324
2014-08-14 2014-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 343,029 343,029 1,705 0.0317
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.