Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,20 € ↑0,60 (3,41%)
2026-06-05
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionBridgeway Capital Management Inc
Latest Disclosed Ownership438,255 shares
Latest Disclosed Value $ 8,835,221
Bridgeway Capital Management Inc reports 2.49% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 15, 2026 - Bridgeway Capital Management Inc filed a 13F-HR form disclosing ownership of 438,255 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $7,494,161 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 427,617 shares of Old Second Bancorp, Inc.. This represents a change in shares of 2.49% during the quarter. The current value of the position is $7,976,241 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 438,255 10,638 2.49 8,835 5.96 0.1777
2026-02-17 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 427,617 -77,334 -15.32 8,339 -4.47 0.1748
2025-11-14 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 504,951 20,423 4.22 8,728 1.55 0.1862
2025-08-14 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 484,528 10,218 2.15 8,596 8.91 0.2040
2025-05-15 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 474,310 102,190 27.46 7,893 19.29 0.1988
2025-02-14 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 372,120 124,336 50.18 6,616 71.31 0.1480
2024-11-14 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 247,784 5,762 2.38 3,863 7.76 0.0835
2024-08-14 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 242,022 7,740 3.30 3,584 10.55 0.0839
2024-05-15 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 234,282 42,967 22.46 3,242 9.79 0.0663
2024-02-14 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 191,315 20,201 11.81 2,954 26.85 0.0634
2023-11-14 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 171,114 6,952 4.23 2,329 8.63 0.0565
2023-08-14 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 164,162 39,297 31.47 2,144 22.11 0.0513
2023-05-15 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 124,865 -2,185 -1.72 1,756 -13.84 0.0466
2023-02-14 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 2,038 22.86 0.0527
2022-11-14 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,658 -2.47 0.0444
2022-08-15 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,700 -7.76 0.0389
2022-05-16 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,843 15.19 0.0356
2022-02-14 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,600 -3.56 0.0297
2021-11-15 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,659 5.33 0.0317
2021-08-16 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,575 -6.14 0.0282
2021-05-17 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,678 30.79 0.0314
2021-02-16 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 1,283 34.77 0.0271
2020-11-16 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 0 0.00 952 -3.64 0.0218
2020-08-31 2020-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 127,050 -71,600 -36.04 988 -28.04 0.0200
2020-08-14 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 127,050 -71,600 988 20,205.7014
2020-05-15 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 198,650 55,000 38.29 1,373 -29.04 0.0314
2020-02-14 2019-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 143,650 0 0.00 1,935 10.26 0.0260
2019-11-14 2019-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 143,650 63,900 80.13 1,755 72.40 0.0243
2019-08-14 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 79,750 0 0.00 1,018 1.39 0.0130
2019-05-15 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 79,750 0 0.00 1,004 -3.18 0.0125
2019-02-14 2018-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 79,750 -68,712 -46.28 1,037 -54.80 0.0138
2018-11-13 2018-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 148,462 0 0.00 2,294 7.30 0.0223
2018-08-14 2018-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 148,462 0 0.00 2,138 3.59 0.0217
2018-05-15 2018-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 148,462 -400 -0.27 2,064 1.57 0.0222
2018-02-14 2017-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 148,862 400 0.27 2,032 1.75 0.0219
2017-11-14 2017-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 148,462 63,262 74.25 1,997 102.95 0.0228
2017-08-14 2017-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 85,200 400 0.47 984 3.14 0.0119
2017-05-15 2017-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 84,800 -226,247 -72.74 954 -72.24 0.0115
2017-02-14 2016-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 311,047 -300 -0.10 3,437 32.86 0.0448
2016-11-14 2016-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 311,347 0 0.00 2,587 21.63 0.0385
2016-08-15 2016-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 311,347 0 0.00 2,127 -4.70 0.0330
2016-05-16 2016-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 311,347 0 0.00 2,232 -8.56 0.0375
2016-02-16 2015-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 311,347 0 0.00 2,441 25.82 0.0454
2015-11-16 2015-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 311,347 58,690 23.23 1,940 16.31 0.0406
2015-10-14 2015-06-30 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 252,657 152,857 153.16 1,668 192.12 0.0329
2015-08-14 2015-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 252,657 1,668
2015-05-15 2015-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 99,800 0 0.00 571 6.53 0.0118
2015-03-10 2014-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 99,800 0 0.00 536 11.67 0.0122
2015-02-17 2014-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 99,800 536
2014-11-14 2014-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 99,800 0 0.00 480 -3.23 0.0121
2014-08-14 2014-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 99,800 24,700 32.89 496 43.77 0.0130
2014-05-15 2014-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 75,100 0 0.00 345 -0.58 0.0099
2014-02-14 2013-12-31 13F OLD SECOND BNCRP COM 680277100 75,100 0 0.00 347 -18.74 0.0106
2013-11-14 2013-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 75,100 17,400 30.16 427 33.86 0.0146
2013-08-14 2013-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 57,700 57,700 319 0.0127
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.