Ducommun Incorporated
US ˙ NYSE ˙ US2641471097

SecurityDCO / Ducommun Incorporated
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership512,167 shares
Ownership 3.40%
Dimensional Fund Advisors Lp ownership in DCO / Ducommun Incorporated

2026-04-09 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 512,167 shares of Ducommun Incorporated (US:DCO). This represents 3.4 percent ownership of the company. In their previous filing dated 2025-10-09 , Dimensional Fund Advisors Lp had reported owning 858,779 shares, indicating a decrease of -40.36 percent.

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)
2026-04-09 2026-04-09 13G/A 858,779 512,167 -40.36 3.40 -41.38
2025-10-09 2025-10-09 13G/A 1,016,433 858,779 -15.51 5.80 -17.14
2024-02-09 2024-02-09 13G/A 935,575 1,016,433 8.64 7.00 -9.09
2023-02-10 2023-02-10 13G/A 897,608 935,575 4.23 7.70 2.67
2022-02-08 2022-02-08 13G/A 947,896 897,608 -5.31 7.50 -7.41
2021-02-12 2021-02-12 13G/A 963,583 947,896 -1.63 8.10 -2.76
2020-02-12 2020-02-12 13G/A 956,755 963,583 0.71 8.33 -0.72
2019-02-08 2019-02-08 13G/A 956,171 956,755 0.06 8.39 -0.59
2018-02-09 2018-02-09 13G/A 941,768 956,171 1.53 8.44 0.12
2017-02-09 2017-02-09 13G/A 927,466 941,768 1.54 8.43 0.72
2016-02-09 2016-02-09 13G/A 927,466 8.37
2015-02-05 2015-02-05 13G/A 918,883 8.40
2014-02-10 2014-02-10 13G/A 906,855 8.41
2013-02-11 2013-02-11 13G/A 846,323 7.99
2012-02-14 2012-02-14 13G/A 838,832 7.96

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.

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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)
2026-05-07 2026-03-31 13F DUCOMMUN INC DEL COM 264147109 512,167 -237,346 -31.67 62,479 -12.37 0.0028
2026-02-12 2025-12-31 13F DUCOMMUN INC DEL COM 264147109 749,513 -109,266 -12.72 71,301 -13.63 0.0150
2025-11-12 2025-09-30 13F DUCOMMUN INC DEL COM 264147109 858,779 -107,792 -11.15 82,551 3.35 0.0177
2025-08-12 2025-06-30 13F DUCOMMUN INC DEL COM 264147109 966,571 -23,193 -2.34 79,872 39.07 0.0185
2025-05-13 2025-03-31 13F DUCOMMUN INC DEL COM 264147109 989,764 -33,244 -3.25 57,436 -11.80 0.0143
2025-02-13 2024-12-31 13F DUCOMMUN INC DEL COM 264147109 1,023,008 -26,789 -2.55 65,122 -5.77 0.0156
2024-11-07 2024-09-30 13F DUCOMMUN INC DEL COM 264147109 1,049,797 -4,997 -0.47 69,108 12.85 0.0168
2024-08-09 2024-06-30 13F DUCOMMUN INC DEL COM 264147109 1,054,794 -3,271 -0.31 61,241 12.83 0.0160
2024-05-10 2024-03-31 13F DUCOMMUN INC DEL COM 264147109 1,058,065 41,632 4.10 54,279 2.58 0.0147
2024-02-07 2023-12-31 13F DUCOMMUN INC DEL COM 264147109 1,016,433 17,897 1.79 52,916 21.79 0.0155
2023-11-09 2023-09-30 13F DUCOMMUN INC DEL COM 264147109 998,536 28,662 2.96 43,447 2.81 0.0142
2023-08-09 2023-06-30 13F DUCOMMUN INC DEL COM 264147109 969,874 4,240 0.44 42,258 -20.01 0.0135
2023-05-12 2023-03-31 13F DUCOMMUN INC DEL COM 264147109 965,634 30,059 3.21 52,829 114,745.65 0.0178
2023-02-09 2022-12-31 13F DUCOMMUN INC DEL COM 264147109 935,575 20,535 2.24 47 -99.87 0.0138
2022-11-10 2022-09-30 13F DUCOMMUN INC DEL COM 264147109 915,040 12,952 1.44 36,290 -6.53 0.0139
2022-08-12 2022-06-30 13F DUCOMMUN INC DEL COM 264147109 902,088 11,954 1.34 38,827 -16.74 0.0139
2022-05-13 2022-03-31 13F DUCOMMUN INC DEL COM 264147109 890,134 -7,474 -0.83 46,634 11.08 0.0144
2022-02-09 2021-12-31 13F DUCOMMUN INC DEL COM 264147109 897,608 -15,477 -1.70 41,981 -8.69 0.0127
2021-11-12 2021-09-30 13F DUCOMMUN INC DEL COM 264147109 913,085 -7,486 -0.81 45,974 -8.47 0.0148
2021-08-12 2021-06-30 13F DUCOMMUN INC DEL COM 264147109 920,571 -5,119 -0.55 50,226 -9.57 0.0159
2021-05-14 2021-03-31 13F DUCOMMUN INC DEL COM 264147109 925,690 -22,206 -2.34 55,540 9.11 0.0184
2021-03-08 2020-12-31 13F/A-2 DUCOMMUN INC DEL COM 264147109 947,896 -23,185 -2.39 50,902 59.23 0.0184
2021-02-11 2020-12-31 13F DUCOMMUN INC DEL COM 264147109 947,896 -23,185 50,902 18,383.0968
2020-11-12 2020-09-30 13F DUCOMMUN INC DEL COM 264147109 971,081 -8,842 -0.90 31,968 -6.44 0.0136
2020-08-13 2020-06-30 13F DUCOMMUN INC DEL COM 264147109 979,923 7,587 0.78 34,170 41.42 0.0150
2020-05-14 2020-03-31 13F DUCOMMUN INC DEL COM 264147109 972,336 8,753 0.91 24,162 -50.38 0.0126
2020-02-14 2019-12-31 13F DUCOMMUN INC DEL COM 264147109 963,583 6,068 0.63 48,690 19.93 0.0177
2019-11-12 2019-09-30 13F DUCOMMUN INC DEL COM 264147109 957,515 -1,971 -0.21 40,599 -6.12 0.0158
2019-08-13 2019-06-30 13F DUCOMMUN INC DEL COM 264147109 959,486 4,802 0.50 43,244 4.08 0.0168
2019-08-12 2019-03-31 13F/A-2 DUCOMMUN INC DEL COM 264147109 954,684 -2,071 -0.22 41,548 19.57 0.0165
2019-05-10 2019-03-31 13F DUCOMMUN INC DEL COM 264147109 954,684 -2,071 41,548
2019-02-26 2018-12-31 13F/A-1 DUCOMMUN INC DEL COM 264147109 956,755 -1,183 -0.12 34,749 -11.18 0.0157
2019-02-13 2018-12-31 13F DUCOMMUN INC DEL COM 264147109 956,755 -1,183 34,749
2018-11-13 2018-09-30 13F DUCOMMUN INC DEL COM 264147109 957,938 5,805 0.61 39,122 24.17 0.0149
2018-08-10 2018-06-30 13F DUCOMMUN INC DEL COM 264147109 952,133 -2,237 -0.23 31,506 8.66 0.0126
2018-05-11 2018-03-31 13F DUCOMMUN INC DEL COM 264147109 954,370 -1,801 -0.19 28,994 6.58 0.0121
2018-02-12 2017-12-31 13F DUCOMMUN INC DEL COM 264147109 956,171 5,326 0.56 27,203 -10.74 0.0113
2017-11-13 2017-09-30 13F DUCOMMUN INC DEL COM 264147109 950,845 6,052 0.64 30,475 2.14 0.0133
2017-08-11 2017-06-30 13F DUCOMMUN INC DEL COM 264147109 944,793 1,561 0.17 29,836 9.87 0.0138
2017-05-12 2017-03-31 13F DUCOMMUN INC DEL COM 264147109 943,232 1,464 0.16 27,156 12.81 0.0130
2017-02-09 2016-12-31 13F DUCOMMUN INC DEL COM 264147109 941,768 -1,098 -0.12 24,072 11.78 0.0120
2016-11-10 2016-09-30 13F DUCOMMUN INC DEL COM 264147109 942,866 45,029 5.02 21,535 21.26 0.0116
2016-08-09 2016-06-30 13F DUCOMMUN INC DEL COM 264147109 897,837 -23,469 -2.55 17,759 26.40 0.0102
2016-05-13 2016-03-31 13F DUCOMMUN INC DEL COM 264147109 921,306 -6,160 -0.66 14,050 -6.61 0.0084
2016-02-10 2015-12-31 13F DUCOMMUN INC DEL COM 264147109 927,466 -12,143 -1.29 15,044 -20.22 0.0094
2015-11-13 2015-09-30 13F DUCOMMUN INC DEL COM 264147109 939,609 4,853 0.52 18,858 -21.41 0.0124
2015-08-14 2015-06-30 13F DUCOMMUN INC DEL COM 264147109 934,756 15,957 1.74 23,995 0.83 0.0147
2015-05-14 2015-03-31 13F DUCOMMUN INC DEL COM 264147109 918,799 -84 -0.01 23,797 2.44 0.0150
2015-02-06 2014-12-31 13F DUCOMMUN INC DEL COM 264147109 918,883 -516 -0.06 23,230 -7.82 0.0153
2014-11-13 2014-09-30 13F DUCOMMUN INC DEL COM 264147109 919,399 -203 -0.02 25,201 4.88 0.0179
2014-08-08 2014-06-30 13F DUCOMMUN INC DEL COM 264147109 919,602 11,698 1.29 24,029 5.61 0.0167
2014-05-14 2014-03-31 13F DUCOMMUN INC DEL COM 264147109 907,904 1,049 0.12 22,752 -15.84 0.0170
2014-02-12 2013-12-31 13F DUCOMMUN INC DEL COM 264147109 906,855 7,560 0.84 27,033 4.82 0.0211
2013-11-13 2013-09-30 13F DUCOMMUN INC DEL COM 264147109 899,295 16,092 1.82 25,791 37.35 0.0223
2013-08-15 2013-06-30 13F DUCOMMUN INC DEL COM 264147109 883,203 883,203 18,777 0.0177
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.