Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,20 € ↑0,60 (3,41%)
2026-06-05
DEL PRIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership75,090 shares
Latest Disclosed Value $ 1,513,815
Principal Financial Group Inc reports 50.84% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 75,090 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $1,284,039 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 49,782 shares of Old Second Bancorp, Inc.. This represents a change in shares of 50.84% during the quarter. The current value of the position is $1,366,638 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)
2026-05-04 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 75,090 25,308 50.84 1,514 55.98 0.0004
2026-02-02 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 49,782 14,820 42.39 971 60.60 0.0005
2025-11-04 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 34,962 -4,608 -11.65 604 -13.84 0.0003
2025-08-08 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 39,570 3,136 8.61 702 15.68 0.0004
2025-04-28 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 36,434 1,109 3.14 606 -3.50 0.0003
2025-01-31 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 35,325 3,082 9.56 628 25.10 0.0003
2024-10-31 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 32,243 3,313 11.45 503 17.29 0.0003
2024-07-29 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 28,930 2,462 9.30 428 16.94 0.0003
2024-04-29 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 26,468 26,468 366 0.0002
2021-02-23 2020-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 0 -23,869 -100.00 0 -100.00
2020-11-06 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 23,869 11,289 89.74 179 82.65 0.0002
2020-08-05 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 12,580 12,580 98 0.0001
2019-08-12 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 0 -12,992 -100.00 0 -100.00
2019-05-10 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 12,992 -58 -0.44 164 -3.53 0.0002
2019-02-14 2018-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 13,050 13,050 170 0.0002
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.