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The three principal private equity investors of Shelf Drilling combine global reach, deep knowledge of the oil and gas industry and expertise in launching newly divested companies.

Principal Investors

Castle Harlan

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Castle Harlan founded in 1987, invests in controlling interests in the buyout and development of middle-market companies worldwide. Castle Harlan has completed 55 acquisitions with more than 100,000 employees and total transaction value in excess of $11 billion. Castle Harlan, along with its affiliates, has managed investment funds with equity commitments of over $6 billion. The firm traces its roots to the start of the institutionalized private-equity business in the late 1960s. For more information, visit 

CHAMP Private Equity


CHAMP Private Equity and its affiliated entities have invested approximately A$3.2 billion of equity capital for buy-outs in the Australasia region since 2000. CHAMP has one of the largest dedicated buyout teams in the region and is one of the most experienced independent advisors to private equity funds in Australasia, having invested in over 90 companies during its 30 year history. CHAMP focuses on long term value creation through sustainable earnings growth, by partnering with superior management teams and re-investing in high-return growth initiatives. CHAMP is able to invest its funds globally, although primarily targets companies with a significant presence in Australia, New Zealand and Southeast Asia. For more information, visit

Lime Rock Partners

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Lime Rock Management was established in 1998 and has raised $7.4 billion in private capital commitments for investment in the energy industry through Lime Rock Partners, investors of growth capital in E&P and oilfield services companies worldwide, and Lime Rock Resources, acquirers and operators of oil and gas properties in the United States. The Lime Rock Partners team brings its specialist finance and operating expertise, technology leadership, people-centered strategies, and patient hard work to help its investors and portfolio company partners profit from operational growth. For more information, visit