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Diamond S Shipping Group Inc.

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Corporate brand

Unclaimed

A Marshall Islands-incorporated tanker shipping company that owned and operated medium-range vessels carrying refined petroleum and related products in international trade.

Last updated August 31, 2026

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Overview

Diamond S Shipping Group Inc. was a maritime transportation company incorporated in the Marshall Islands and headquartered in Greenwich, Connecticut. Its business centered on owning and operating medium-range product tankers used in international, transoceanic trade. The vessels transported refined petroleum products and other liquid cargoes between production, refining, storage, and consumption markets, with operations extending to ports in China and elsewhere in Asia. The company’s fleet was described as comprising 33 product tankers. A substantial proportion of the vessels were chartered to customers under multiyear arrangements, giving Diamond S Shipping exposure to recurring contracted revenue while retaining participation in the broader tanker market. Its operating model was therefore based less on selling a consumer-facing product than on providing maritime transport capacity to energy and commodity businesses. The company’s vessels formed part of the medium-range tanker segment, which commonly serves regional and interregional movements of refined fuels and related products. Diamond S Shipping operated through a group of subsidiaries, including DSS Vessel II LLC, Diamond S Shipping III LLC, and Diamond S Management LLC. These entities supported vessel ownership, management, and related corporate functions. The company was associated with institutional and private-equity investors, including First Reserve Corporation, CarVal, and affiliates of WL Ross & Co. Those relationships reflected the capital-intensive structure of commercial shipping, where fleet acquisition and maintenance require substantial investment and where ownership is frequently organized through separate vessel-holding companies. The company was publicly traded on the New York Stock Exchange under the symbol DSSI. Craig Stevenson Jr. served as chief executive officer. Wilbur Ross, who had been involved with Diamond S Shipping before becoming United States secretary of commerce in 2017, later became the subject of public scrutiny because of his continuing financial interests in shipping companies and the potential conflict between those holdings and his government responsibilities. The Commerce Department stated in November 2017 that Ross had fully divested his interests in Diamond S Shipping and Navigator Gas. The matter was discussed in reporting connected with the Paradise Papers and with questions concerning related investment relationships. Diamond S Shipping’s identity was principally that of an institutional shipping owner and operator rather than a consumer brand. Its commercial significance lay in its tanker fleet, chartering relationships, corporate structure, and access to international energy-trade routes. The available reference material does not establish a complete founding chronology, a current website, or a detailed account of the company’s later corporate disposition. Because the cited material describes the company in the past tense and does not provide current operating information, its present status is treated as defunct rather than active.

History

Diamond S Shipping Group Inc. was established as a corporate shipping owner incorporated under the laws of the Marshall Islands, with its headquarters in Greenwich, Connecticut. The available reference material does not identify a founding year or a founding individual. Its corporate structure reflected a common model in commercial shipping: individual vessels and operating functions were held or managed through affiliated limited-liability companies while the parent company coordinated ownership, financing, and business operations. The company specialized in medium-range product tankers. These vessels transported refined petroleum and other liquid products through international sea routes, linking energy suppliers, refineries, storage terminals, and industrial or consumer markets. Diamond S Shipping was described as operating 33 product tankers, many of which were chartered to customers for several years at a time. This chartering approach provided customers with dependable transportation capacity and allowed the company to organize its fleet around contracted commercial relationships as well as prevailing tanker-market conditions. Diamond S Shipping’s activity extended beyond a single national market. Its vessels operated in the international transoceanic trade and called at ports in China and other parts of Asia. The company’s role was therefore that of a maritime infrastructure provider rather than a branded fuel seller: it moved cargoes owned or traded by other companies and earned revenue from vessel employment and chartering. Subsidiaries identified in the reference material included DSS Vessel II LLC, Diamond S Shipping III LLC, and Diamond S Management LLC. Together, these entities represented the vessel-ownership and management arrangements supporting the broader group. The company was associated with institutional investment from First Reserve Corporation, CarVal, and affiliates of WL Ross & Co. Such ownership links placed Diamond S Shipping within the private-equity-backed segment of the shipping industry, where fleet scale and access to capital are important competitive factors. Diamond S Shipping became a publicly traded company on the New York Stock Exchange under ticker DSSI. Craig Stevenson Jr. was identified as its chief executive officer. Wilbur Ross was previously part of the company’s management and ownership network. After Ross became United States secretary of commerce in February 2017, he stepped away from decision-making at Diamond S Shipping, although reporting continued to examine his financial interest in the company. In November 2017, coverage related to the Paradise Papers brought renewed attention to his shipping investments and raised questions about possible conflicts between private holdings and public duties. The Commerce Department subsequently announced that Ross had fully divested his interests in Diamond S Shipping and Navigator Gas. The available source does not provide a full account of Diamond S Shipping’s later history, including the precise date and mechanism by which its operations ended or whether its assets were transferred to another corporate group. Since the supplied material describes the company historically and offers no current operating information, the dossier records the brand as defunct while retaining the documented fleet, business model, subsidiaries, investors, and public-company history.

  • 2017

    Wilbur Ross divested his Diamond S Shipping stake

    [1]

    The Commerce Department announced that Wilbur Ross had fully divested his interests in Diamond S Shipping following public scrutiny of his shipping investments.

  • Incorporated in the Marshall Islands

    [1]

    Diamond S Shipping Group Inc. was legally incorporated in the Marshall Islands and operated from headquarters in Greenwich, Connecticut.

  • Built a medium-range product tanker fleet

    [1]

    The company became an owner and operator of approximately 33 medium-range product tankers serving international refined-petroleum and related-product trade.

  • Became publicly traded under DSSI

    [1]

    Diamond S Shipping Group Inc. traded on the New York Stock Exchange under the ticker DSSI.

Products and positioning

An institutional owner and operator of medium-range product tankers serving international refined-petroleum and liquid-commodity trade.

  • Maritime transportation

    Medium-range product tankers

    Diamond S Shipping’s principal operating assets were medium-range product tankers designed for international carriage of refined petroleum and other liquid products. The fleet was reported to contain 33 vessels. These ships served transoceanic and regional routes, including port calls in China and other Asian markets, and were frequently employed under multiyear charter arrangements with commercial customers.

  • Shipping services

    Tanker chartering services

    The company chartered tanker capacity to customers transporting refined petroleum and related products. Multiyear charters were an important part of its commercial model, providing customers with scheduled vessel access while allowing Diamond S Shipping to monetize its owned fleet through contracted employment.

Controversies

  • 2017

    Wilbur Ross shipping-investment conflict-of-interest controversy

    Reporting connected to the Paradise Papers examined Wilbur Ross’s interests in Diamond S Shipping and other transoceanic shipping companies while he served as United States secretary of commerce. The coverage raised questions about whether his private investments could conflict with his public responsibilities. The Commerce Department later stated that he had fully divested his interests in Diamond S Shipping and Navigator Gas.

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Brand decisions

  • 2017

    Ross stepped away from Diamond S decision-makingOther

    Background

    Wilbur Ross became United States secretary of commerce in February 2017, creating public scrutiny around his continuing financial interests in shipping companies.

    Action taken

    Ross stepped down from decision-making at Diamond S Shipping, and the Commerce Department later announced that he had fully divested his Diamond S Shipping interest.

    Aftermath

    The divestiture addressed the stated conflict-of-interest concern, although the matter continued to receive media attention in connection with the Paradise Papers.

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