PRESS RELEASE

SEACOR HOLDINGS ANNOUNCES FIRST QUARTER RESULTS

Fort Lauderdale, Florida
April 20, 2011

FOR IMMEDIATE RELEASE — SEACOR Holdings Inc. (NYSE:CKH) today announced its results for the first quarter of 2011. Net income attributable to SEACOR Holdings Inc. for the quarter ended March 31, 2011 was $11.2 million, or $0.52 per diluted share, on operating revenues of $472.3 million.

For the preceding quarter ended December 31, 2010, net income attributable to SEACOR Holdings Inc. was $27.1 million, or $1.27 per diluted share, on operating revenues of $580.4 million.

For the quarter ended March 31, 2010, net income attributable to SEACOR Holdings Inc. was $3.6 million, or $0.16 per diluted share, on operating revenues of $394.6 million.

Highlights for the Quarter

Offshore Marine Services – Offshore Marine Services reported an operating loss of $2.6 million on operating revenues of $80.3 million compared with operating income of $0.9 million on operating revenues of $100.6 million in the preceding quarter. First quarter results included $4.4 million in gains on asset dispositions compared with $2.1 million in gains in the preceding quarter.

In the U.S. Gulf of Mexico, operating income was $3.0 million lower than the preceding quarter primarily due to continued soft market conditions attributable to the ongoing slow down in the issuance of drilling permits by the Bureau of Ocean Energy Management. In the first quarter, utilization was 40.5% compared with 50.4% in the preceding quarter. Average day rates decreased from $11,669 per day to $9,898 per day. The number of days available for hire decreased by 819, or 16%, due to net fleet dispositions including the return of six vessels to leasing companies during the preceding quarter. As of March 31, 2011, the Company had twelve vessels cold-stacked in the U.S. Gulf of Mexico, compared with 13 as of December 31, 2010.

Operating income associated with international operations was $0.5 million lower than the preceding quarter primarily due to net fleet dispositions and increased drydocking and repair activity in the North Sea. These reductions were partially offset by lower labor costs following the recognition in the preceding quarter of a $7.8 million charge for the Company’s share of a funding deficit arising from the March 2009 actuarial valuation of the United Kingdom Merchant Navy Officers’ Pension Fund.

In the first quarter, the total number of days available for charter decreased by 918, or 7.8%, primarily due to net fleet dispositions, overall utilization decreased from 68.5% to 65.1% and overall average day rates decreased by 4.9% from $10,646 per day to $10,123 per day.

Aviation Services – Operating income was $5.9 million on operating revenues of $56.2 million compared with an operating loss of $0.1 million on operating revenues of $55.5 million in the preceding quarter. First quarter results included $2.2 million in gains on asset dispositions compared with $0.1 million in losses in the preceding quarter.

Operating expenses were $3.7 million lower in the first quarter primarily due to the receipt of insurance proceeds related to hurricane damages sustained in 2005, an insurance credit for good experience and the termination of a power by hour maintenance contract.

Inland River Services - Operating income was $11.0 million on operating revenues of $46.5 million compared with operating income of $14.9 million on operating revenues of $52.3 million in the preceding quarter. Freight rates remained relatively firm in the first quarter but results were affected by difficult weather-related operating conditions and higher fuel prices.

Marine Transportation Services – Operating income was $1.9 million on operating revenues of $17.3 million compared with operating income of $1.4 million on operating revenues of $16.9 million in the preceding quarter. The improvement in operating income was primarily due to a reduction in out-of-service time for one vessel and lower insurance and legal expenses.

Environmental Services – Operating income was $9.3 million on operating revenues of $63.1 million compared with operating income of $38.0 million on operating revenues of $163.4 million in the preceding quarter. The reduction in operating income reflects the winding-down of activities associated with the Deepwater Horizon oil spill response.

Commodity Trading and Logistics - Commodity Trading and Logistics reported a segment loss in the first quarter of $0.4 million on operating revenues of $194.0 million compared with a segment loss of $4.2 million on operating revenues of $178.9 million in the preceding quarter.

Other – Other, primarily Harbor and Offshore Towing Services, reported operating income of $3.5 million on operating revenues of $17.5 million compared with an operating loss of $0.8 million on operating revenues of $16.4 million in the preceding quarter. The improvement in operating income was primarily due to increased harbor activity at most ports and lower drydocking and repair costs.

Corporate and Eliminations – Administrative and general expenses were $10.7 million compared with $18.0 million in the preceding quarter. The reduction reflects expenses recorded in the preceding quarter for management bonus accruals, the acceleration of restricted stock awards and amounts designated for a foundation formed following the Deepwater Horizon oil spill to support environmental research and other causes relevant to the Company’s business. Derivative income, net, of $1.1 million was primarily due to gains on exchange traded commodity option and future contracts.

Marketable Securities - Marketable security gains, net, of $1.5 million were primarily the result of gains on long equity positions partially offset by losses on short equity positions.

Foreign Currency – Foreign currency gains, net, of $5.1 million were primarily due to the strengthening of the euro against the U.S. dollar.

Capital Commitments – The Company’s unfunded capital commitments as of March 31, 2011 consisted primarily of offshore support vessels, helicopters, an interest in a dry-bulk articulated tug-barge, an interest in a river grain terminal and other equipment. These commitments totaled $244.6 million, of which $164.8 million is payable during the remainder of 2011 with the balance payable through 2013. Of the total unfunded capital commitments, $2.8 million may be terminated without further liability. Subsequent to March 31, 2011, the Company committed to purchase additional equipment for $2.5 million. As of March 31, 2011, the Company held balances of cash, cash equivalents, restricted cash, marketable securities, construction reserve funds and title XI reserve funds totaling $910.0 million.

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SEACOR is a global provider of equipment and services primarily supporting the offshore oil and gas and marine transportation industries. SEACOR offers customers a diversified suite of services including offshore marine, aviation, inland river, marine transportation, environmental, commodity trading and logistics and offshore and harbor towing. SEACOR is focused on providing highly responsive local service combined with the highest safety standards, innovative technology, modern, efficient equipment and dedicated professional employees.

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This release includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements concerning management’s expectations, strategic objectives, business prospects, anticipated economic performance and financial condition and other similar matters involve known and unknown risks, uncertainties and other important factors that could cause the actual results, performance or achievements of results to differ materially from any future results, performance or achievements discussed or implied by such forward-looking statements. Such risks, uncertainties and other important factors include, among others: decreased demand and loss of revenues as a result of U.S. government implemented moratoriums directing operators to cease certain drilling activities and any extension of such moratoriums (the “Moratoriums”), weakening demand for the Company’s services as a result of unplanned customer suspensions, cancellations, rate reductions or non-renewals of vessel charters and aviation equipment or failures to finalize commitments to charter vessels and aviation equipment in response to Moratoriums, increased government legislation and regulation of the Company’s businesses could increase cost of operations, increased competition if the Jones Act is repealed, liability, legal fees and costs in connection with providing spill and emergency response services, including the Company’s involvement in response to the oil spill as a result of the sinking of the Deepwater Horizon in April 2010, decreased demand for the Company’s services as a result of declines in the global economy, declines in valuations in the global financial markets and illiquidity in the credit sectors, including, interest rate fluctuations, availability of credit, inflation rates, change in laws, trade barriers, commodity prices and currency exchange fluctuations, the cyclical nature of the oil and gas industry, loss of U.S. coastwise endorsement for the Seabulk Trader and Seabulk Challenge, retrofitted double-hull tankers, if the Company is unsuccessful in litigation instructing the U.S. Coast Guard to revoke their coastwise charters, activity in foreign countries and changes in foreign political, military and economic conditions, changes in foreign and domestic oil and gas exploration and production activity, safety record requirements related to Offshore Marine Services, Marine Transportation Services and Aviation Services, decreased demand for Marine Transportation Services and Harbor and Offshore Towing Services due to construction of additional refined petroleum product, natural gas or crude oil pipelines or due to decreased demand for refined petroleum products, crude oil or chemical products or a change in existing methods of delivery, compliance with U.S. and foreign government laws and regulations, including environmental laws and regulations, the dependence of Offshore Marine Services, Marine Transportation Services and Aviation Services on several customers, consolidation of the Company’s customer base, the ongoing need to replace aging vessels and aircraft, industry fleet capacity, restrictions imposed by the Shipping Acts and Aviation Acts on the amount of foreign ownership of the Company’s Common Stock, operational risks of Offshore Marine Services, Marine Transportation Services, Harbor and Offshore Towing Services and Aviation Services, effects of adverse weather conditions and seasonality, future phase-out of Marine Transportation Services’ double-bottom tanker, dependence of spill response revenue on the number and size of spills and upon continuing government regulation in this area and Environmental Services’ ability to comply with such regulation and other governmental regulation, changes in National Response Corporations’ Oil Spill Removal Organization classification, liability in connection with providing spill response services, the level of grain export volume, the effect of fuel prices on barge towing costs, variability in freight rates for inland river barges, the effect of international economic and political factors in Inland River Services’ operations, sudden and unexpected changes in commodity prices, futures and options, global weather conditions, political instability, changes in currency exchanges rates, and product availability in Commodity Trading and Logistics activities, adequacy of insurance coverage, the attraction and retention of qualified personnel by the Company and various other matters and factors, many of which are beyond the Company’s control. In addition, these statements constitute the Company’s cautionary statements under the Private Securities Litigation Reform Act of 1995. It is not possible to predict or identify all such factors. Consequently, the foregoing should not be considered a complete discussion of all potential risks or uncertainties. The words “estimate,” “project,” “intend,” “believe,” “plan” and similar expressions are intended to identify forward-looking statements. Forward-looking statements speak only as of the date of the document in which they are made. The Company disclaims any obligation or undertaking to provide any updates or revisions to any forward-looking statement to reflect any change in the Company’s expectations or any change in events, conditions or circumstances on which the forward-looking statement is based. The forward-looking statements in this release should be evaluated together with the many uncertainties that affect the Company’s businesses, particularly those mentioned under “Forward-Looking Statements” in Item 7 on the Company’s Form 10-K and SEACOR’s periodic reporting on Form 10-Q and Form 8-K (if any), which are incorporated by reference.

For additional information, contact Molly Hottinger at (954) 627-5278 or visit SEACOR’s website at www.seacorholdings.com.

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