老第二銀行公司
US ˙ NasdaqGS ˙ US6802771005

SecurityOSBC / Old Second Bancorp, Inc.
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership75,032 shares
Latest Disclosed Value $ 1,331,067
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series ownership in OSBC / Old Second Bancorp, Inc.

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 75,032 shares of Old Second Bancorp, Inc. (US:OSBC) valued at $1,331,068 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 75,032 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 $1,617,690 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)
2025-08-26 2025-06-30 NP Old Second Bancorp EC US6802771005 75,032 0 0.00 1,331 6.65 0.0299
2025-05-28 2025-03-31 NP Old Second Bancorp EC US6802771005 75,032 2,393 3.29 1,249 -3.33 0.0299
2025-02-25 2024-12-31 NP Old Second Bancorp EC US6802771005 72,639 -14,240 -16.39 1,292 -4.65 0.0282
2024-11-26 2024-09-30 NP Old Second Bancorp EC US6802771005 86,879 5,943 7.34 1,354 13.02 0.0256
2024-08-26 2024-06-30 NP Old Second Bancorp EC US6802771005 80,936 3,800 4.93 1,199 12.28 0.0244
2024-05-28 2024-03-31 NP Old Second Bancorp EC US6802771005 77,136 -2,926 -3.65 1,068 -13.67 0.0223
2024-02-26 2023-12-31 NP Old Second Bancorp EC US6802771005 80,062 7,755 10.73 1,236 25.61 0.0264
2023-11-28 2023-09-30 NP Old Second Bancorp EC US6802771005 72,307 -3,896 -5.11 984 -1.11 0.0257
2023-08-25 2023-06-30 NP Old Second Bancorp EC US6802771005 76,203 8,470 12.50 995 4.52 0.0236
2023-05-26 2023-03-31 NP Old Second Bancorp EC US6802771005 67,733 0 0.00 952 -12.34 0.0254
2023-02-24 2022-12-31 NP Old Second Bancorp EC US6802771005 67,733 2,285 3.49 1,086 27.17 0.0299
2022-11-25 2022-09-30 NP Old Second Bancorp EC US6802771005 65,448 0 0.00 854 -2.40 0.0245
2022-08-25 2022-06-30 NP Old Second Bancorp EC US6802771005 65,448 20,729 46.35 876 35.03 0.0242
2022-05-26 2022-03-31 NP Old Second Bancorp EC US6802771005 44,719 -3,243 -6.76 649 7.46 0.0151
2022-02-25 2021-12-31 NP Old Second Bancorp EC US6802771005 47,962 0 0.00 604 -3.67 0.0131
2021-11-24 2021-09-30 NP Old Second Bancorp EC US6802771005 47,962 0 0.00 626 5.39 0.0138
2021-08-26 2021-06-30 NP Old Second Bancorp EC US6802771005 47,962 0 0.00 595 -6.16 0.0128
2021-05-27 2021-03-31 NP Old Second Bancorp EC US6802771005 47,962 -4,719 -8.96 634 18.98 0.0144
2021-02-25 2020-12-31 NP Old Second Bancorp EC US6802771005 52,681 0 0.00 532 35.03 0.0136
2020-11-25 2020-09-30 NP Old Second Bancorp EC US6802771005 52,681 0 0.00 395 -3.67 0.0127
2020-08-27 2020-06-30 NP Old Second Bancorp EC US6802771005 52,681 0 0.00 410 12.36 0.0134
2020-06-01 2020-03-31 NP Old Second Bancorp EC US6802771005 52,681 7,895 17.63 364 -39.64 0.0149
2020-02-27 2019-12-31 NP Old Second Bancorp EC 680277100 44,786 -5,493 -10.93 603 -1.79 0.0181
2019-11-27 2019-09-30 NP Old Second Bancorp EC US6802771005 50,279 50,279 614 0.0203
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.