GulfMark Offshore and Rigdon Marine Announce Signing of Purchase Agreement

GulfMark Offshore, Inc. (NYSE:GLF) today announced it had entered into a definitive purchase agreement to acquire Rigdon Marine Corporation (RMC), a major operator of technologically advanced offshore supply vessels.

GulfMark Offshore, Inc. (NYSE:GLF) today announced it had entered into a definitive purchase agreement to acquire Rigdon Marine Corporation (RMC), a major operator of technologically advanced offshore supply vessels. The purchase will add the RMC management team, an experienced group of mariners and a fleet of modern vessels designed to support the expanding demand in the deepwater Gulf of Mexico. The combined company will initially operate 90 vessels with an additional 16 vessels under construction for delivery through 2010. Geographically diversified, the combined fleet will have 24 vessels in the domestic Gulf of Mexico bringing the total fleet to 34 vessels based in the Americas, 42 vessels based in the North Sea and 14 in Southeast Asia.

Combination Highlights:

•GulfMark will have an Enterprise Value approaching $2 Billion.
•Accretive to GulfMark's remaining 2008 and future cash flow and earnings per share.
•Adds annualized revenues of over $115 Million from the 22 owned vessels in the Rigdon fleet at closing.
•Revenue contribution from the total 28 owned vessel Rigdon fleet could approach an annual rate of $150 million.
•Creates one of the world's youngest, largest and most geographically balanced, high specification offshore support vessel fleets with an average age of less than 10 years.
•Management team comprised of seasoned industry veterans with years of international and domestic operations experience.
•Provides immediate diversification of global operations through expanded base of assets, services and clients.
•Establishes an organization with a significant position in the growing deepwater Gulf of Mexico market.

The combination of GulfMark and Rigdon Marine will create an organization of over 2,000 valued employees and 90 vessels, capable of working in virtually all OSV markets, with an additional 16 vessels of several different designs under construction. Nine of the vessels will deliver between the middle of 2008 and the middle of 2009 and the remaining seven between mid 2009 and mid 2010.

Bruce Streeter, President and CEO of GulfMark said, "Rigdon Marine has an excellent employee base with a strong management team, excellent market penetration and a growing fleet of well designed vessels. The addition of Rigdon Marine will complement and expand the strong asset base of GulfMark. The integration of the two companies with strong safety cultures, highly skilled employee bases and equipment designed to meet the future needs of the industry, strategically positions the combined company for future growth and value creation. In addition to the domestic U.S. vessel operations and customer base, we will add operations in Trinidad and a vessel working in support of seismic services worldwide. Our Americas operations will now encompass the U.S., Mexico, Trinidad and Brazil. We expect the combination to be accretive to GulfMark earnings and cash flow per share from the outset, including the remaining part of 2008. More importantly, as future vessel deliveries of the combined company enter the market, GulfMark will have a strong position in the domestic United States market and the capacity to expand to further locations, thus complementing our strong international presence."

President and CEO Larry Rigdon of Rigdon Marine commented, "GulfMark is a solid company with a large technically-advanced fleet and a company culture that blends well with Rigdon's. I believe that the combination of Rigdon and GulfMark will benefit the shareholders of both companies, and more importantly, provide further opportunities for all our employees to grow and reach their career objectives."

Transaction Details

Under the terms of the agreement, GulfMark will acquire 100% of the outstanding equity interest of Rigdon Marine and its holding company for consideration comprising $150 million in cash and approximately 2.1 million shares of GulfMark common stock, plus assumption of approximately $268 million in debt and approximately $19 million in expenditures to complete the vessels under construction. GulfMark expects to finance the cash portion of the consideration with cash on hand and borrowings under its current $175 million revolver. In conjunction with the transaction, Mr. Rigdon will join the GulfMark Board of Directors.

On the Web: Gulfmark Offshore, Inc.: http://www.gulfmark.com/
On the Web: Rigdon Marine Corporation:

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