Old Second Bancorp, Inc.
US ˙ NasdaqGS ˙ US6802771005

SecurityOSBC / Old Second Bancorp, Inc.
InstitutionNicolet Advisory Services, Llc
Latest Disclosed Ownership20,210 shares
Latest Disclosed Value $ 398,743
Nicolet Advisory Services, Llc ownership in OSBC / Old Second Bancorp, Inc.

On February 13, 2026 - Nicolet Advisory Services, Llc filed a 13F-HR form disclosing ownership of 20,210 shares of Old Second Bancorp, Inc. (US:OSBC) valued at $394,095 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 20,210 shares of Old Second Bancorp, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $432,898 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)
2026-02-13 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 399 14.37 0.0269
2025-11-13 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 349 3.88 0.0271
2025-08-13 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 335 14.33 0.0285
2025-05-08 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 294 -16.05 0.0291
2025-02-12 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 349 15.95 0.0321
2024-11-12 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 302 -0.33 0.0285
2024-08-14 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 303 9.42 0.0290
2024-05-10 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 277 -11.82 0.0281
2024-02-13 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 313 15.93 0.0337
2023-11-07 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 271 3.45 0.0300
2023-08-09 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 262 -2.25 0.0287
2023-05-09 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 268 -18.84 0.0309
2023-02-09 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 330 20.96 0.0436
2022-11-10 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 272 -5.23 0.0444
2022-08-08 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 287 0.70 0.0426
2022-05-10 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 285 12.20 0.0372
2022-02-08 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 254 -3.79 0.0312
2021-11-16 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 264 5.18 0.0335
2021-08-11 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 251 -5.99 0.0327
2021-05-03 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 267 30.88 0.0375
2021-02-09 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 204 35.10 0.0286
2020-10-27 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 151 -3.82 0.0235
2020-08-14 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 157 12.14 0.0241
2020-04-21 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 140 -48.53 0.0247
2020-01-23 2019-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 272 10.12 0.0427
2019-10-22 2019-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 247 -4.26 0.0375
2019-07-26 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 0 0.00 258 1.57 0.0394
2019-05-10 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 20,210 20,210 254 0.0431
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.