1 EXHIBIT 21.01 SUBSIDIARIES OF MARTIN MARIETTA MATERIALS, INC. AS OF MARCH 13, 1998 NAME OF SUBSIDIARY ------------------ PERCENT OWNED ------------- American Aggregates Corporation, a Delaware corporation 100% American Stone Company, a North Carolina corporation 50%(1) Bahama Rock Limited, a Bahamas corporation 100% Bayou Mining, Inc., a Louisiana corporation 100% Central Rock Company, a North Carolina corporation 100% Dredging & Hauling, Inc., a Delaware corporation 100%(2) Martin Marietta Aggregates of Iowa, Inc., an Iowa corporation 100% Martin Marietta Aggregates of Southern Iowa, Inc., an Iowa corporation 100% Martin Marietta Exports, Inc., a Barbados corporation 100% Martin Marietta Magnesia Specialties Inc., a Delaware corporation 100% Martin Marietta Materials Canada Limited, a Nova Scotia, Canada corporation 100% Martin Marietta Materials de Mexico, S.A. de C.V., a Mexican corporation 100%(3) Martin Marietta Technologies Corporation, a Delaware corporation 100% OK Sand & Gravel, LLC, a Delaware limited liability company 99% R&S Sand & Gravel, LLC, a Delaware limited liability company 99% Superior Stone Company, a North Carolina corporation 100% Theodore Holdings, LLC, a Delaware limited liability company 51% __________________ 1 Central Rock Company, a wholly-owned subsidiary of the Company, owns a 50% interest in American Stone Company. 2 Dredging & Hauling, Inc. is a wholly-owned subsidiary of American Aggregates Corporation. 3 Martin Marietta Materials de Mexico, S.A. de C.V. is owned by Martin Marietta Magnesia Specialties Inc. (99%) and Martin Marietta Materials, Inc. (1%). 28