X0306 4 2021-03-11 0001129155 MARINE PRODUCTS CORP MPX 0001189576 CYNKUS HARRY J 2801 BUFORD HIGHWAY NE 300 ATLANTA GA 30329 true false false false Common Stock $.10 Par Value 2021-03-11 5 L false 10 18.37 A 1760 D Common Stock $.10 Par Value 2021-06-11 5 L false 13 15.77 A 1773 D Common Stock $.10 Par Value 2021-09-13 5 L false 16 12.96 A 1789 D Represents shares that were purchased as part of an automatic dividend reinvestment program entered into by the reporting person. /s/ Harry J. Cynkus 2021-11-12