Old Second Bancorp, Inc.
US ˙ NasdaqGS ˙ US6802771005

SecurityOSBC / Old Second Bancorp, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership924,719 shares
Ownership 3.14%
Dimensional Fund Advisors Lp ownership in OSBC / Old Second Bancorp, Inc.

2015-02-05 - Dimensional Fund Advisors Lp has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 924,719 shares of Old Second Bancorp, Inc. (US:OSBC). This represents 3.14 percent ownership of the company.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2015-02-05 2015-02-05 13G/A 924,719 3.14
2014-02-10 2014-02-10 13G/A 935,463 6.72
2013-02-11 2013-02-11 13G/A 937,558 6.66
2012-02-14 2012-02-14 13G/A 952,329 6.79

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-07 2026-03-31 13F OLD SECOND BANCORP INC DEL COM 680277100 2,388,862 127,988 5.66 48,159 9.23 0.0100
2026-02-12 2025-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 2,260,874 55,990 2.54 44,087 15.68 0.0092
2025-11-12 2025-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 2,204,884 86,416 4.08 38,111 1.41 0.0082
2025-08-12 2025-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 2,118,468 26,038 1.24 37,582 7.94 0.0087
2025-05-13 2025-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 2,092,430 72,997 3.61 34,818 -3.03 0.0087
2025-02-13 2024-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 2,019,433 134,455 7.13 35,906 22.18 0.0086
2024-11-07 2024-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,884,978 184,168 10.83 29,386 16.67 0.0071
2024-08-09 2024-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,700,810 138,253 8.85 25,188 16.48 0.0066
2024-05-10 2024-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,562,557 175,382 12.64 21,626 0.97 0.0059
2024-02-07 2023-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,387,175 167,355 13.72 21,419 29.02 0.0063
2023-11-09 2023-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,219,820 210,901 20.90 16,602 25.99 0.0054
2023-08-09 2023-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,008,919 158,405 18.62 13,177 10.19 0.0042
2023-05-12 2023-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 850,514 -8,934 -1.04 11,958 91,876.92 0.0040
2023-02-09 2022-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 859,448 -2,286 -0.27 14 -99.88 0.0041
2022-11-10 2022-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 861,734 -41,070 -4.55 11,245 -6.90 0.0043
2022-08-12 2022-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 902,804 -50,143 -5.26 12,079 -12.64 0.0043
2022-05-13 2022-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 952,947 62,934 7.07 13,827 23.40 0.0043
2022-02-09 2021-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 890,013 -3,028 -0.34 11,205 -3.93 0.0034
2021-11-12 2021-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 893,041 -110,137 -10.98 11,663 -6.24 0.0038
2021-08-12 2021-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,003,178 -32,375 -3.13 12,439 -9.07 0.0039
2021-05-14 2021-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,035,553 -32,645 -3.06 13,680 26.80 0.0045
2021-03-08 2020-12-31 13F/A-2 OLD SECOND BANCORP INC ILL COM 680277100 1,068,198 -1,115 -0.10 10,789 34.61 0.0039
2021-02-11 2020-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,068,198 -1,115 10,789 3,896.4133
2020-11-12 2020-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,069,313 -19,141 -1.76 8,015 -5.35 0.0034
2020-08-13 2020-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,088,454 -1,450 -0.13 8,468 12.43 0.0037
2020-05-14 2020-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,089,904 9,229 0.85 7,532 -48.26 0.0039
2020-02-14 2019-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,080,675 -8,546 -0.78 14,557 9.36 0.0053
2019-11-12 2019-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,089,221 -2,096 -0.19 13,311 -4.48 0.0052
2019-08-13 2019-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,091,317 15,885 1.48 13,936 2.92 0.0054
2019-08-12 2019-03-31 13F/A-2 OLD SECOND BANCORP INC ILL COM 680277100 1,075,432 92,541 9.42 13,540 5.97 0.0054
2019-05-10 2019-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,075,432 92,541 13,540
2019-02-26 2018-12-31 13F/A-1 OLD SECOND BANCORP INC ILL COM 680277100 982,891 -11,084 -1.12 12,777 -16.80 0.0058
2019-02-13 2018-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 982,891 -11,084 12,777
2018-11-13 2018-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 993,975 -29,728 -2.90 15,357 4.17 0.0058
2018-08-10 2018-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,023,703 -10,754 -1.04 14,742 2.52 0.0059
2018-05-11 2018-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,034,457 -2,281 -0.22 14,379 1.60 0.0060
2018-02-12 2017-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,036,738 2,345 0.23 14,152 1.72 0.0059
2017-11-13 2017-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,034,393 3,487 0.34 13,913 16.85 0.0061
2017-08-11 2017-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,030,906 -3,381 -0.33 11,907 2.33 0.0055
2017-05-12 2017-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,034,287 233 0.02 11,636 1.84 0.0056
2017-02-09 2016-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,034,054 180 0.02 11,426 33.00 0.0057
2016-11-10 2016-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,033,874 0 0.00 8,591 21.67 0.0046
2016-08-09 2016-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 1,033,874 2,517 0.24 7,061 -4.52 0.0041
2016-05-13 2016-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,031,357 6,720 0.66 7,395 -7.94 0.0044
2016-02-10 2015-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 1,024,637 27,787 2.79 8,033 29.36 0.0050
2015-11-13 2015-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 996,850 63,781 6.84 6,210 0.84 0.0041
2015-08-14 2015-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 933,069 4,438 0.48 6,158 15.93 0.0038
2015-05-14 2015-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 928,631 3,912 0.42 5,312 6.97 0.0034
2015-02-06 2014-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 924,719 10,177 1.11 4,966 12.89 0.0033
2014-11-13 2014-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 914,542 -9,722 -1.05 4,399 -4.24 0.0031
2014-08-08 2014-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 924,264 -11,199 -1.20 4,594 6.76 0.0032
2014-05-14 2014-03-31 13F OLD SECOND BANCORP INC ILL COM 680277100 935,463 0 0.00 4,303 -0.21 0.0032
2014-02-12 2013-12-31 13F OLD SECOND BANCORP INC ILL COM 680277100 935,463 0 0.00 4,312 -18.99 0.0034
2013-11-13 2013-09-30 13F OLD SECOND BANCORP INC ILL COM 680277100 935,463 -2,095 -0.22 5,323 2.86 0.0046
2013-08-15 2013-06-30 13F OLD SECOND BANCORP INC ILL COM 680277100 937,558 937,558 5,175 0.0049
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.