Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,20 € ↑0,60 (3,41%)
2026-06-05
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionGoldman Sachs Group Inc
Latest Disclosed Ownership1,691,523 shares
Latest Disclosed Value $ 34,101,103
Goldman Sachs Group Inc reports 33.91% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 15, 2026 - Goldman Sachs Group Inc filed a 13F-HR form disclosing ownership of 1,691,523 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $28,925,043 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 1,263,223 shares of Old Second Bancorp, Inc.. This represents a change in shares of 33.91% during the quarter. The current value of the position is $30,785,719 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.

Upgrade to unlock premium data and export to Excel .

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 CMN 680277100 1,691,523 428,300 33.91 34,101 38.44 0.0039
2026-02-10 2025-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 1,263,223 -295,483 -18.96 24,633 -8.57 0.0030
2025-11-14 2025-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 1,558,706 163,374 11.71 26,942 8.84 0.0033
2025-08-14 2025-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 1,395,332 -83,000 -5.61 24,753 0.63 0.0034
2025-06-27 2025-03-31 13F/A-2 OLD SECOND BANCORP INC ILL CMN 680277100 1,478,332 630,265 74.32 24,599 63.14 0.0040
2025-05-16 2025-03-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 1,478,332 630,265 24,599 0.0010
2025-05-09 2025-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 1,478,332 630,265 24,599 0.0007
2025-02-11 2024-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 848,067 9,848 1.17 15,079 15.39 0.0024
2024-11-14 2024-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 838,219 336,241 66.98 13,068 75.77 0.0021
2024-08-13 2024-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 501,978 203,329 68.08 7,434 79.87 0.0013
2024-05-15 2024-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 298,649 14,356 5.05 4,133 -5.83 0.0007
2024-05-14 2023-12-31 13F/A-2 OLD SECOND BANCORP INC ILL CMN 680277100 284,293 -31,437 -9.96 4,389 2.14 0.0008
2024-03-01 2023-12-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 284,293 4,389
2024-02-13 2023-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 284,293 -31,437 4,389 0.0008
2024-05-15 2023-09-30 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 315,730 -138,324 -30.46 4,297 -27.53 0.0009
2023-11-14 2023-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 315,730 -138,324 4,297 0.0009
2024-05-14 2023-06-30 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 454,054 203,495 81.22 5,930 68.34 0.0013
2023-08-15 2023-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 454,054 203,495 5,930 0.0012
2024-05-14 2023-03-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 250,559 128,380 105.08 3,523 79.79 0.0008
2023-05-11 2023-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 250,559 128,380 3,523 0.0008
2024-05-14 2022-12-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 122,179 4,080 3.45 1,960 195,800.00 0.0005
2023-02-13 2022-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 122,179 4,080 1,960 0.0004
2024-05-14 2022-09-30 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 118,099 11,639 10.93 2 0.00 0.0004
2022-11-14 2022-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 118,099 11,639 1,541 0.0004
2024-05-14 2022-06-30 13F/A-2 OLD SECOND BANCORP INC ILL CMN 680277100 106,460 18,261 20.70 1 -99.92 0.0004
2022-08-18 2022-06-30 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 106,460 18,261 1,424 0.0003
2022-08-15 2022-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 106,460 18,261 1,424 0.0003
2022-05-16 2022-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 88,199 20,676 30.62 1,280 50.59 0.0003
2022-02-17 2021-12-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 67,523 1,911 2.91 850 -0.82 0.0002
2022-02-14 2021-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 67,523 1,911 850 0.0000
2022-01-20 2021-09-30 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 65,612 -20,744 -24.02 857 -19.98 0.0002
2021-11-10 2021-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 65,612 -20,744 857 0.0002
2021-08-13 2021-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 86,356 -79,314 -47.87 1,071 -51.05 0.0002
2021-05-17 2021-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 165,670 89,157 116.53 2,188 183.05 0.0006
2021-02-12 2020-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 76,513 -11,301 -12.87 773 17.48 0.0002
2020-11-13 2020-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 87,814 -60,068 -40.62 658 -42.83 0.0002
2020-08-12 2020-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 147,882 69,691 89.13 1,151 113.15 0.0003
2020-05-15 2020-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 78,191 -87,067 -52.69 540 -75.74 0.0002
2020-02-14 2019-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 165,258 116,854 241.41 2,226 276.01 0.0006
2019-11-14 2019-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 48,404 34,169 240.04 592 225.27 0.0002
2019-08-14 2019-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 14,235 -13,003 -47.74 182 -46.94 0.0001
2019-05-15 2019-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 27,238 16,114 144.86 343 136.55 0.0001
2019-02-14 2018-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 11,124 -10,202 -47.84 145 -55.93 0.0000
2018-11-14 2018-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 21,326 -11,042 -34.11 329 -29.40 0.0001
2018-08-14 2018-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 32,368 19,657 154.65 466 163.28 0.0001
2018-05-15 2018-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 12,711 -21,113 -62.42 177 -61.69 0.0000
2018-02-14 2017-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 33,824 11,738 53.15 462 55.56 0.0001
2017-11-14 2017-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 22,086 -12,481 -36.11 297 -25.56 0.0001
2017-08-14 2017-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 34,567 -8,643 -20.00 399 -17.90 0.0001
2017-05-18 2017-03-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 43,210 8,375 24.04 486 26.23 0.0001
2017-05-15 2017-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 43,210 486
2017-02-14 2016-12-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 34,835 -3,893 -10.05 385 19.57 0.0001
2016-11-14 2016-09-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 38,728 16,929 77.66 322 116.11 0.0001
2016-08-15 2016-06-30 13F OLD SECOND BANCORP INC ILL CMN 680277100 21,799 1,899 9.54 149 4.20 0.0000
2016-05-13 2016-03-31 13F OLD SECOND BANCORP INC ILL CMN 680277100 19,900 19,900 143 0.0000
2013-06-14 2012-12-31 13F/A-1 OLD SECOND BANCORP INC ILL CMN 680277100 0 -22,572 -100.00 0 -100.00
2013-06-14 2012-09-30 13F/A-2 OLD SECOND BANCORP INC ILL CMN 680277100 22,572 4,313 23.62 33 37.50 0.0000
2013-06-14 2012-06-30 13F/A-2 OLD SECOND BANCORP INC ILL CMN 680277100 18,259 18,259 24 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.