Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,20 € ↑0,60 (3,41%)
2026-06-05
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership66,095 shares
Latest Disclosed Value $ 1,332,467
Rhumbline Advisers reports 1.31% decrease in ownership of OSB / Old Second Bancorp, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 66,095 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $1,130,224 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 66,974 shares of Old Second Bancorp, Inc.. This represents a change in shares of -1.31% during the quarter. The current value of the position is $1,202,929 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)
2026-05-12 2026-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 66,095 -879 -1.31 1,332 2.07 0.0011
2026-02-13 2025-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 66,974 -8,375 -11.11 1,306 0.23 0.0011
2025-11-06 2025-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 75,349 4,256 5.99 1,302 3.25 0.0010
2025-08-12 2025-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 71,093 2,811 4.12 1,261 11.00 0.0011
2025-05-29 2025-03-31 13F/A-1 OLD 2ND BANCORP INC DEL COM COM 680277100 68,282 -3,263 -4.56 1,136 -10.69 0.0011
2025-04-08 2025-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 68,282 -3,263 1,136 0.0011
2025-05-29 2024-12-31 13F/A-1 OLD 2ND BANCORP INC DEL COM COM 680277100 71,545 2,099 3.02 1,272 17.56 0.0011
2025-01-30 2024-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 71,545 2,099 1,272 0.0011
2024-11-12 2024-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 69,446 -3,709 -5.07 1,083 -0.09 0.0010
2024-08-01 2024-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 73,155 1,923 2.70 1,083 9.95 0.0010
2024-05-09 2024-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 71,232 -28,564 -28.62 986 -36.04 0.0009
2024-02-08 2023-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 99,796 228 0.23 1,541 13.65 0.0016
2023-11-09 2023-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 99,568 -22,649 -18.53 1,355 -15.10 0.0016
2023-08-08 2023-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 122,217 53,825 78.70 1,596 0.0018
2023-05-11 2023-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 68,392 4,282 6.68 1 -100.00 0.0012
2023-02-14 2022-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 64,110 207 0.32 1,028 23.26 0.0014
2022-11-10 2022-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 63,903 3,518 5.83 834 3.22 0.0012
2022-08-11 2022-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 60,385 21,280 54.42 808 42.50 0.0012
2022-05-12 2022-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 39,105 -3,556 -8.34 567 5.59 0.0007
2022-02-10 2021-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 42,661 2,111 5.21 537 1.32 0.0007
2021-11-12 2021-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 40,550 802 2.02 530 7.51 0.0007
2021-08-05 2021-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 39,748 -6,750 -14.52 493 -19.71 0.0006
2021-05-06 2021-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 46,498 -2,080 -4.28 614 25.05 0.0008
2021-02-10 2020-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 48,578 5,981 14.04 491 53.92 0.0007
2020-11-12 2020-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 42,597 -6,141 -12.60 319 -15.83 0.0005
2020-08-13 2020-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 48,738 -7,785 -13.77 379 -3.07 0.0006
2020-05-06 2020-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 56,523 11,300 24.99 391 -35.80 0.0008
2020-02-05 2019-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 45,223 179 0.40 609 10.73 0.0010
2019-10-23 2019-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 45,044 3,976 9.68 550 4.96 0.0010
2019-08-14 2019-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 41,068 523 1.29 524 2.75 0.0010
2019-05-01 2019-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 40,545 -567 -1.38 510 -4.49 0.0010
2019-01-31 2018-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 41,112 12,325 42.81 534 20.00 0.0012
2018-11-07 2018-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 28,787 226 0.79 445 8.27 0.0009
2018-08-06 2018-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 28,561 725 2.60 411 6.20 0.0008
2018-05-02 2018-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 27,836 -1,425 -4.87 387 -3.01 0.0008
2018-02-09 2017-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 29,261 -5,300 -15.34 399 -14.19 0.0008
2017-11-06 2017-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 34,561 310 0.91 465 17.42 0.0010
2017-08-02 2017-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 34,251 725 2.16 396 5.04 0.0009
2017-05-02 2017-03-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 33,526 1,243 3.85 377 5.60 0.0009
2017-01-27 2016-12-31 13F OLD 2ND BANCORP INC DEL COM COM 680277100 32,283 -1,448 -4.29 357 27.50 0.0009
2016-11-08 2016-09-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 33,731 300 0.90 280 22.81 0.0008
2016-08-11 2016-06-30 13F OLD 2ND BANCORP INC DEL COM COM 680277100 33,431 -9,280 -21.73 228 -25.49 0.0007
2016-05-02 2016-03-31 13F OLD SECOND BANCORP INC COM COM 680277100 42,711 4,245 11.04 306 1.32 0.0009
2016-02-03 2015-12-31 13F OLD SECOND BANCORP INC COM COM 680277100 38,466 1,835 5.01 302 32.46 0.0010
2015-11-04 2015-09-30 13F OLD SECOND BANCORP INC COM COM 680277100 36,631 2,243 6.52 228 0.44 0.0008
2015-08-04 2015-06-30 13F OLD SECOND BANCORP INC COM COM 680277100 34,388 34,388 227 0.0007
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.