 FORT LAUDERDALE, Fla., Aug. 13, 2021 GLOBE NEWSWIRE -- SEACOR Holdings Inc. SEACOR or the Company announced today the completion of its acquisition of U.S. Shipping Corp USSC, a privately owned, leading provider of long-haul marine transportation for chemical and petroleum cargoes in the U.S. coastwise trade, operating under the Jones Act. The transaction closed on August 13, 2021. 