Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
17,60 € ↓ -0,50 (-2,76%)
2026-06-04
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership2,523 shares
Latest Disclosed Value $ 50,864
Quadrant Capital Group Llc ownership in OSB / Old Second Bancorp, Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 2,523 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $43,143 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,523 shares of Old Second Bancorp, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $44,405 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 COM 680277100 2,523 0 0.00 51 2.04 0.0015
2026-05-11 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 2,523 0 49 0.0369
2026-02-12 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 2,523 622 32.72 49 53.13 0.0015
2025-11-13 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,901 1,901 33 0.0011
2025-08-13 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -1,923 -100.00 0 -100.00
2025-05-13 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,923 -10 -0.52 32 -8.82 0.0012
2025-02-13 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,933 113 6.21 34 21.43 0.0024
2024-11-12 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,820 -57 -3.04 28 3.70 0.0020
2024-08-12 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,877 692 58.40 28 68.75 0.0021
2024-05-15 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,185 620 109.73 16 100.00 0.0013
2024-02-08 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 565 165 41.25 9 60.00 0.0007
2023-11-14 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 400 0 0.00 5 0.00 0.0005
2023-08-10 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 400 -1,069 -72.77 5 -75.00 0.0005
2023-05-11 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,469 -380 -20.55 21 -31.03 0.0022
2023-02-13 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,849 -131 -6.62 30 11.54 0.0034
2022-11-10 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,980 1,570 382.93 26 420.00 0.0034
2022-08-09 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 410 0 0.00 5 -16.67 0.0007
2022-05-06 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 410 0 0.00 6 20.00 0.0007
2022-02-01 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 410 0 0.00 5 0.00 0.0006
2021-11-12 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 410 -582 -58.67 5 -58.33 0.0007
2021-08-09 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 992 595 149.87 12 140.00 0.0017
2021-05-12 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 397 0 0.00 5 25.00 0.0008
2021-02-16 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 397 0 0.00 4 33.33 0.0007
2020-11-13 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 397 0 0.00 3 0.00 0.0007
2020-08-13 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 397 124 45.42 3 50.00 0.0007
2020-05-15 2020-03-31 13F Old Second Bancorp Com 680277100 273 273 2 0.0003
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.