Martin Marietta Materials, Inc. (NYSE: MLM) was formed in November 1993 as a North Carolina corporation to hold the aggregates/construction-materials and magnesia-based-products businesses of Martin Marietta Corporation, IPO'd Feb 1994. Following the 1995 Lockheed-Martin Marietta merger, Lockheed Martin distributed its ~81% stake in Martin Marietta Materials to its own shareholders on July 26, 1996, making Martin Marietta Materials a fully independent public company unrelated to Lockheed Martin's aerospace/defense business, despite the shared name.
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