Marine Products Corporation
US ˙ NYSE ˙ US5684271084
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecurityMPX / Marine Products Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership767,510 shares
Latest Disclosed Value $ 5,579,846
Dimensional Fund Advisors Lp reports 2.83% increase in ownership of MPX / Marine Products Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 767,510 shares of Marine Products Corporation (US:MPX) valued at $5,579,798 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 746,412 shares of Marine Products Corporation. This represents a change in shares of 2.83% during the quarter. The current value of the position is $0 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)
2026-05-07 2026-03-31 13F MARINE PRODS COM 568427108 767,510 21,098 2.83 5,580 -14.67 0.0002
2026-02-12 2025-12-31 13F MARINE PRODS COM 568427108 746,412 7,739 1.05 6,539 -0.21 0.0014
2025-11-12 2025-09-30 13F MARINE PRODS COM 568427108 738,673 2,323 0.32 6,552 4.56 0.0014
2025-08-12 2025-06-30 13F MARINE PRODS COM 568427108 736,350 27,182 3.83 6,267 5.33 0.0015
2025-05-13 2025-03-31 13F MARINE PRODS COM 568427108 709,168 25,175 3.68 5,950 -5.13 0.0015
2025-02-13 2024-12-31 13F MARINE PRODS COM 568427108 683,993 27,628 4.21 6,272 -1.40 0.0015
2024-11-07 2024-09-30 13F MARINE PRODS COM 568427108 656,365 5,932 0.91 6,360 -3.18 0.0015
2024-08-09 2024-06-30 13F MARINE PRODS COM 568427108 650,433 9,680 1.51 6,569 -12.74 0.0017
2024-05-10 2024-03-31 13F MARINE PRODS COM 568427108 640,753 -2,949 -0.46 7,529 2.59 0.0020
2024-02-07 2023-12-31 13F MARINE PRODS COM 568427108 643,702 1,442 0.22 7,339 -19.59 0.0021
2023-11-09 2023-09-30 13F MARINE PRODS COM 568427108 642,260 17,557 2.81 9,126 -13.35 0.0030
2023-08-09 2023-06-30 13F MARINE PRODS COM 568427108 624,703 28,606 4.80 10,533 33.96 0.0034
2023-05-12 2023-03-31 13F MARINE PRODS COM 568427108 596,097 17,108 2.95 7,862 130,933.33 0.0026
2023-02-09 2022-12-31 13F MARINE PRODS COM 568427108 578,989 3,911 0.68 7 -99.88 0.0020
2022-11-10 2022-09-30 13F MARINE PRODS COM 568427108 575,078 -990 -0.17 4,866 -11.17 0.0019
2022-08-12 2022-06-30 13F MARINE PRODS COM 568427108 576,068 -6,102 -1.05 5,478 -18.53 0.0020
2022-05-13 2022-03-31 13F MARINE PRODS COM 568427108 582,170 -163 -0.03 6,724 -7.62 0.0021
2022-02-09 2021-12-31 13F MARINE PRODS COM 568427108 582,333 -22,832 -3.77 7,279 -3.86 0.0022
2021-11-12 2021-09-30 13F MARINE PRODS COM 568427108 605,165 -23,574 -3.75 7,571 -22.01 0.0024
2021-08-12 2021-06-30 13F MARINE PRODS COM 568427108 628,739 1,796 0.29 9,708 -4.83 0.0031
2021-05-14 2021-03-31 13F MARINE PRODS COM 568427108 626,943 -24,634 -3.78 10,201 7.67 0.0034
2021-03-08 2020-12-31 13F/A-2 MARINE PRODS COM 568427108 651,577 -3,750 -0.57 9,474 -7.56 0.0034
2021-02-11 2020-12-31 13F MARINE PRODS COM 568427108 651,577 -3,750 9,474 3,421.5052
2020-11-12 2020-09-30 13F MARINE PRODS COM 568427108 655,327 -30,950 -4.51 10,249 7.83 0.0043
2020-08-13 2020-06-30 13F MARINE PRODS COM 568427108 686,277 1,076 0.16 9,505 71.63 0.0042
2020-05-14 2020-03-31 13F MARINE PRODS COM 568427108 685,201 -402 -0.06 5,538 -43.91 0.0029
2020-02-14 2019-12-31 13F MARINE PRODS COM 568427108 685,603 -1,815 -0.26 9,873 1.43 0.0036
2019-11-12 2019-09-30 13F MARINE PRODS COM 568427108 687,418 4,195 0.61 9,734 -7.73 0.0038
2019-08-13 2019-06-30 13F MARINE PRODS COM 568427108 683,223 -2,824 -0.41 10,549 14.15 0.0041
2019-08-12 2019-03-31 13F/A-2 MARINE PRODS COM 568427108 686,047 28,412 4.32 9,241 -16.90 0.0037
2019-05-10 2019-03-31 13F MARINE PRODS COM 568427108 686,047 28,412 9,241
2019-02-26 2018-12-31 13F/A-1 MARINE PRODS COM 568427108 657,635 21,011 3.30 11,121 -23.68 0.0050
2019-02-13 2018-12-31 13F MARINE PRODS COM 568427108 657,635 21,011 11,121
2018-11-13 2018-09-30 13F MARINE PRODS COM 568427108 636,624 9,152 1.46 14,572 30.61 0.0055
2018-08-10 2018-06-30 13F MARINE PRODS COM 568427108 627,472 9,353 1.51 11,157 28.83 0.0044
2018-05-11 2018-03-31 13F MARINE PRODS COM 568427108 618,119 20,430 3.42 8,660 13.72 0.0036
2018-02-12 2017-12-31 13F MARINE PRODS COM 568427108 597,689 6,315 1.07 7,615 -19.77 0.0032
2017-11-13 2017-09-30 13F MARINE PRODS COM 568427108 591,374 21,526 3.78 9,492 6.71 0.0041
2017-08-11 2017-06-30 13F MARINE PRODS COM 568427108 569,848 16,977 3.07 8,895 48.00 0.0041
2017-05-12 2017-03-31 13F MARINE PRODS COM 568427108 552,871 28,765 5.49 6,010 -17.32 0.0029
2017-02-09 2016-12-31 13F MARINE PRODS COM 568427108 524,106 -380,609 -42.07 7,269 -10.43 0.0036
2016-11-10 2016-09-30 13F MARINE PRODS COM 568427108 904,715 4,594 0.51 8,115 6.57 0.0044
2016-08-09 2016-06-30 13F MARINE PRODS COM 568427108 900,121 1,247 0.14 7,615 11.62 0.0044
2016-05-13 2016-03-31 13F MARINE PRODS COM 568427108 898,874 0 0.00 6,822 25.66 0.0041
2016-02-10 2015-12-31 13F MARINE PRODS COM 568427108 898,874 3,042 0.34 5,429 -12.67 0.0034
2015-11-13 2015-09-30 13F MARINE PRODS COM 568427108 895,832 1,600 0.18 6,217 11.42 0.0041
2015-08-14 2015-06-30 13F MARINE PRODS COM 568427108 894,232 1,819 0.20 5,580 -27.04 0.0034
2015-05-14 2015-03-31 13F MARINE PRODS COM 568427108 892,413 -586 -0.07 7,648 1.47 0.0048
2015-02-06 2014-12-31 13F MARINE PRODS COM 568427108 892,999 5,688 0.64 7,537 7.66 0.0050
2014-11-13 2014-09-30 13F MARINE PRODS COM 568427108 887,311 -2,473 -0.28 7,001 -5.20 0.0050
2014-08-08 2014-06-30 13F MARINE PRODS COM 568427108 889,784 2,400 0.27 7,385 10.67 0.0051
2014-05-14 2014-03-31 13F MARINE PRODS COM 568427108 887,384 0 0.00 6,673 -25.17 0.0050
2014-02-12 2013-12-31 13F MARINE PRODS COM 568427108 887,384 -1,096 -0.12 8,918 10.55 0.0069
2013-11-13 2013-09-30 13F MARINE PRODS COM 568427108 888,480 -5,076 -0.57 8,067 12.57 0.0070
2013-08-15 2013-06-30 13F MARINE PRODS COM 568427108 893,556 893,556 7,166 0.0067
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.