Martin Marietta Materials, Inc. Declares Regular Cash Dividend of 23 Cents Per Share

RALEIGH, North Carolina (November 17, 2005) -- Stephen P. Zelnak, Jr., Chairman and Chief Executive Officer of Martin Marietta Materials, Inc. (NYSE:MLM), today announced that the Board of Directors has declared a regular quarterly cash dividend of $0.23 per share on the Corporation's common stock. This dividend, which represents a cash dividend of $0.92 per share on an annualized basis, is payable December 30, 2005, to shareholders of record at the close of business on December 1, 2005.

Martin Marietta is the nation's second largest producer of construction aggregates, a leading producer of magnesia-based chemical products and is developing structural composites products for use in a wide variety of industries.