Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,10 € ↑0,30 (1,69%)
2026-06-03
AKTIENPREIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership90,225 shares
Latest Disclosed Value $ 1,818,936
Renaissance Technologies Llc reports 4.52% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 90,225 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $1,542,848 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 86,325 shares of Old Second Bancorp, Inc.. This represents a change in shares of 4.52% during the quarter. The current value of the position is $1,633,073 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)
2026-05-14 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 90,225 3,900 4.52 1,819 8.02 0.0028
2026-02-12 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 86,325 37,200 75.73 1,683 98.23 0.0026
2025-11-13 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 49,125 -33,600 -40.62 849 -42.13 0.0011
2025-08-13 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 82,725 -69,200 -45.55 1,468 -41.97 0.0020
2025-05-14 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 151,925 45,700 43.02 2,528 33.90 0.0038
2025-02-13 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 106,225 -48,400 -31.30 1,889 -21.66 0.0028
2024-11-13 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 154,625 -67,900 -30.51 2,411 -26.86 0.0036
2024-08-09 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 222,525 -52,000 -18.94 3,296 109,733.33 0.0056
2024-05-13 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 274,525 -64,000 -18.91 4 -40.00 0.0060
2024-02-13 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 338,525 -13,900 -3.94 5 25.00 0.0081
2023-11-14 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 352,425 -48,200 -12.03 5 -20.00 0.0082
2023-08-11 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 400,625 -41,000 -9.28 5 -16.67 0.0075
2023-05-12 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 441,625 -47,800 -9.77 6 -14.29 0.0082
2023-02-13 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 489,425 -21,800 -4.26 8 -99.90 0.0107
2022-11-14 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 511,225 -87,800 -14.66 6,671 -16.77 0.0094
2022-08-12 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 599,025 -98,700 -14.15 8,015 -20.83 0.0095
2022-05-13 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 697,725 -163,900 -19.02 10,124 -6.67 0.0119
2022-02-11 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 861,625 -10,750 -1.23 10,848 -4.78 0.0135
2021-11-12 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 872,375 24,550 2.90 11,393 8.37 0.0147
2021-08-13 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 847,825 -13,300 -1.54 10,513 -7.58 0.0131
2021-05-13 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 861,125 -146,413 -14.53 11,375 11.78 0.0142
2021-02-10 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,007,538 -47,687 -4.52 10,176 28.66 0.0110
2020-11-13 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,055,225 -137,700 -11.54 7,909 -14.78 0.0079
2020-08-13 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,192,925 46,700 4.07 9,281 17.18 0.0080
2020-05-14 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,146,225 -69,104 -5.69 7,920 -51.62 0.0077
2020-02-13 2019-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,215,329 35,904 3.04 16,370 13.58 0.0126
2019-11-13 2019-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,179,425 59,000 5.27 14,413 0.73 0.0122
2019-08-12 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,120,425 18,500 1.68 14,308 3.14 0.0126
2019-05-14 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,101,925 87,200 8.59 13,873 5.17 0.0126
2019-02-12 2018-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,014,725 -118,075 -10.42 13,191 -24.63 0.0144
2018-11-13 2018-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,132,800 1,100 0.10 17,502 7.40 0.0180
2018-08-13 2018-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 1,131,700 77,300 7.33 16,296 11.19 0.0178
2018-08-13 2018-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,054,400 14,656
2018-05-14 2018-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,054,400 35,700 3.50 14,656 5.40 0.0160
2018-02-13 2017-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,018,700 69,300 7.30 13,905 8.90 0.0153
2017-11-13 2017-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 949,400 105,200 12.46 12,769 30.95 0.0150
2017-08-11 2017-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 844,200 123,000 17.05 9,751 20.18 0.0124
2017-05-12 2017-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 721,200 54,900 8.24 8,114 10.20 0.0113
2017-02-13 2016-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 666,300 107,564 19.25 7,363 58.58 0.0116
2016-11-14 2016-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 558,736 117,936 26.75 4,643 54.20 0.0082
2016-08-12 2016-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 440,800 21,000 5.00 3,011 0.03 0.0057
2016-05-13 2016-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 419,800 30,200 7.75 3,010 -1.44 0.0057
2016-02-11 2015-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 389,600 27,700 7.65 3,054 35.43 0.0067
2015-11-12 2015-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 361,900 59,892 19.83 2,255 13.15 0.0054
2015-08-14 2015-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 302,008 115,408 61.85 1,993 86.79 0.0045
2015-05-13 2015-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 186,600 23,832 14.64 1,067 22.08 0.0023
2015-02-13 2014-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 162,768 33,988 26.39 874 41.20 0.0021
2014-11-12 2014-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 128,780 6,636 5.43 619 1.98 0.0017
2014-08-13 2014-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 122,144 -20,467 -14.35 607 -7.47 0.0014
2014-05-14 2014-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 142,611 -15,489 -9.80 656 -10.14 0.0016
2014-02-14 2013-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 158,100 -19,700 -11.08 730 -27.87 0.0017
2013-11-13 2013-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 177,800 14,300 8.75 1,012 12.07 0.0025
2013-08-12 2013-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 163,500 163,500 903 0.0024
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.