Disclosures: National Marine Dredging Co. Financial Results for the Period Ended March 31,2021

Disclosures: National Marine Dredging Co. Board Meeting Results held on 06/05/2021 at 17:00

Disclosures: Amending the time of the meeting of the Board of Directors of the National Marine Dredging Company, scheduled to be held on 6/5/2021

Disclosures: National Marine Dredging Co. Announcement of Board Meeting to be held on 06/05/2021 at 21:30

Disclosures: National Marine Dredging Co. AGM Minutes held on 28/03/2021 at 15:00

Disclosures: National Marine Dredging Co - Uncollected cash dividends distributions by the Shareholders for the period before 1 March, 2015.

Disclosures: National Marine Dredging Co. Board Meeting Results held on 31/03/2021 at 11:30

Disclosures: National Marine Dredging Co. AGM Results held on 28/03/2021 at 15:00

Disclosures: National Marine Dredging Co. Announcement of Board Meeting to be held on 31/03/2021 at 11:30

Disclosures: NMDC-Nominations received for Board membership

Disclosures: National Marine Dredging Co. Financial Results for the Period Ended December 31,2020

Disclosures: National Marine Dredging Co. Management Discussion and Analysis Report for the Period Ended December 31,2020