Old Second Bancorp, Inc.
DE ˙ DB ˙ US6802771005
18,10 € ↑0,30 (1,69%)
2026-06-03
AKTIENPREIS
SecurityDE:OSB / Old Second Bancorp, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership26,232 shares
Latest Disclosed Value $ 528,968
Janus Henderson Group Plc reports 67.78% increase in ownership of OSB / Old Second Bancorp, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 26,232 shares of Old Second Bancorp, Inc. (DE:OSB) valued at $448,567 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 15,635 shares of Old Second Bancorp, Inc.. This represents a change in shares of 67.78% during the quarter. The current value of the position is $474,799 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)
2026-05-18 2026-03-31 13F/A-1 OLD SECOND BANCORP INC DEL COM 680277100 26,232 10,597 67.78 529 73.68 0.0001
2026-05-15 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 26,232 10,597 529 0.0003
2026-02-17 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 15,635 0 0.00 305 12.59 0.0001
2025-11-14 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 15,635 0 0.00 270 -2.53 0.0001
2025-08-14 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 15,635 -9,175 -36.98 277 -33.09 0.0001
2025-05-15 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 24,810 -11,628 -31.91 414 -36.11 0.0002
2025-02-14 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 36,438 -799 -2.15 648 11.72 0.0003
2024-11-14 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 37,237 -1,202 -3.13 581 1.93 0.0003
2024-08-14 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 38,439 -2,124 -5.24 569 1.43 0.0003
2024-05-15 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 40,563 -2,524 -5.86 561 -15.64 0.0003
2024-02-14 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 43,087 3,093 7.73 665 22.24 0.0004
2023-11-14 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 39,994 825 2.11 544 6.46 0.0004
2023-08-14 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 39,169 17,807 83.36 511 70.90 0.0003
2023-05-15 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 21,362 21,362 300 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.