OBA Group BV runs its dry bulk terminal OBA Bulk Terminal Amsterdam in the Port of Amsterdam. The company is specialized in handling, storage and processing of dry bulk commodities.

Oceanco is a world-class builder of custom superyachts in the 80–140 meters range. It's yachts are built with meticulous dedication to the vision of both the owner and designer.

Oiltanking Amsterdam B.V. provides tank storage and blending services for liquid fuels. These products include gasoline, kerosene, gas oil, diesel, naphtha, molasses, chemicals and crude oil.

Olam Cocoa operates several cocoa processing facilities in the Amsterdam region, providing its customers with ingredients, blends and recipes that suit their needs.

Oliehandel Klaas de Boer B.V. is an independent and flexible supplier of fuels, lubricants and chemicals. Many of it customers are active in the fishery industry. The products are supplied by large refineries. Oliehandel Klaas de Boer B.V.

Oliehandel Anton van Megen is supplier of gas oil, lubricants and shipping supplies for professional and recreational craft. This is partly done through an extensive network of bunker partners. The company also operates a historic tugboat.

OmniHealth is een medische organisatie met een passie voor de maritieme en offshore industrie. OmniHealth biedt medische keuringen voor de zeevaart, binnenvaart en offshore.

Ondernemersvereniging Regio Amsterdam (ORAM) is the largest business association in the Greater Amsterdam Metropolitan Area. ORAM presents itself as the only independent advocate for businesses in Amsterdam.

Orange Nautical Services offers sixteen thousand square meter Yacht Storage. With her skilled team of craftsman and network of specialized subcontractors Orange takes care of all disciplines of maintenance, repair and refit.