Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,10 € ↑0,30 (1,69%)
2026-06-03
AKTIENPREIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionSquarepoint Ops LLC
Latest Disclosed Ownership170,651 shares
Latest Disclosed Value $ 3,440,324
Squarepoint Ops LLC reports 252.06% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 15, 2026 - Squarepoint Ops LLC filed a 13F-HR form disclosing ownership of 170,651 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $2,918,132 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 48,472 shares of Old Second Bancorp, Inc.. This represents a change in shares of 252.06% during the quarter. The current value of the position is $3,088,783 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)
2026-05-15 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 170,651 122,179 252.06 3,440 264.02 0.0040
2026-02-13 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 48,472 38,117 368.10 945 430.90 0.0010
2025-11-14 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 10,355 10,355 179 0.0002
2025-08-27 2025-03-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 0 -22,703 -100.00 0 -100.00
2025-05-15 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 0 0
2025-02-14 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 22,703 1,363 6.39 404 21.39 0.0004
2024-11-14 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 21,340 21,340 333 0.0005
2024-08-14 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -24,672 -100.00 0 -100.00
2024-05-15 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 24,672 24,672 341 0.0006
2023-05-15 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -18,690 -100.00 0 -100.00
2023-02-14 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 18,690 18,690 300 0.0012
2021-11-15 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -13,315 -100.00 0 -100.00
2021-08-16 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 13,315 13,315 165 0.0006
2021-05-17 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -20,908 -100.00 0 -100.00
2021-02-16 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,908 20,908 211 0.0016
2020-08-14 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -13,090 -100.00 0 -100.00
2020-05-15 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 13,090 -25,643 -66.20 90 -82.76 0.0023
2020-02-14 2019-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 38,733 7,691 24.78 522 37.73 0.0031
2019-11-14 2019-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 31,042 5,872 23.33 379 18.07 0.0034
2019-08-14 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 25,170 -2,531 -9.14 321 -8.02 0.0031
2019-05-15 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 27,701 -4,747 -14.63 349 -17.30 0.0037
2019-02-14 2018-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 32,448 8,314 34.45 422 13.14 0.0049
2018-11-14 2018-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 24,134 3,902 19.29 373 28.18 0.0045
2018-08-14 2018-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,232 232 1.16 291 4.68 0.0039
2018-05-15 2018-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,000 -3,881 -16.25 278 -14.72 0.0044
2018-02-14 2017-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 23,881 12,281 105.87 326 108.97 0.0057
2017-11-14 2017-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 11,600 11,600 -51.43 156 -52.15 0.0030
2017-05-15 2017-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -12,676 -100.00 0 -100.00
2017-02-14 2016-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 12,676 12,676 140 0.0057
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.