According to US authorities, Senat arranged the purchase, repair, certification, and crewing of vessels for OMMC.
"Arms shipments transported by OMMC serve as a key resource for North Korea's ongoing proliferation activities," Acting Under Secretary for Terrorism and Financial Intelligence Adam J Szubin was quoted in the Treasury's press release.
The United Nations and the US imposed sanctions on OMMC in July 2014 for the attempted arms import into North Korea.
Under UN sanctions, North Korea is banned from weapons exports and the import of all but small arms. There are also separate US sanctions also target Pyongyang's nuclear arms programme.