MARTIN MARIETTA MATERIALS, INC. (NYSE:MLM) Files An 8-K Entry into a Material Definitive Agreement

Item1.01. Entry into a Material Definitive Agreement.

In connection with the issuance of $300 million aggregate
principal amount of Floating Rate Senior Notes due 2020 (the
Floating Rate Notes) and $300 million aggregate principal amount
of Senior Notes due 2027 (the Fixed Rate Notes and, together with
the Floating Rate Notes, the Senior Notes), on May17, 2017,
Martin Marietta Materials, Inc. (Martin Marietta or the Company)
entered into an underwriting agreement (the Underwriting
Agreement), with Deutsche Bank Securities Inc. and J.P. Morgan
Securities LLC, as representatives of the several underwriters
named therein (the Underwriters), to which the Underwriters
agreed to purchase the Senior Notes from the Company. The
Underwriting Agreement contains the terms and conditions of the
offering and sale of the Senior Notes, indemnification and
contribution obligations and other customary terms and
conditions.

The foregoing description of the Underwriting Agreement does not
purport to be complete and is qualified in its entirety by
reference to the full text of the Underwriting Agreement, which
is attached hereto as Exhibit 1.1 and incorporated by reference
herein.

Item7.01. Regulation FD Disclosure.

In accordance with General Instruction B.2. of Form 8-K, the
following information and the attached Exhibit 99.1 shall not be
deemed to be filed for purposes of Section18 of the Securities
Exchange Act of 1934, as amended, nor shall it be deemed
incorporated by reference in any filing under the Securities Act
of 1933, as amended. Martin Marietta disclaims any intention or
obligation to update or revise this information.

Attached as Exhibit 99.1, and incorporated herein by reference,
is a copy of Martin Mariettas press release dated March17, 2017,
announcing the pricing of its Senior Notes.

This current report does not constitute an offer to sell or a
solicitation of an offer to buy, nor shall there be any sale of
the Senior Notes in any jurisdiction in which such offer,
solicitation or sale would be unlawful prior to registration or
qualification under the securities laws of any such jurisdiction.

Item9.01. Financial Statements and Exhibits.

About MARTIN MARIETTA MATERIALS, INC. (NYSE:MLM)

Martin Marietta Materials, Inc. is a supplier of aggregates products (crushed stone, sand and gravel) for the construction industry, used for the construction of infrastructure, non-residential, and residential projects. The Company operates through three businesses: Aggregates Business, Cement Business and Magnesia Specialties Business. The Company conducts its Aggregates business through three segments: the Mid-America Group, Southeast Group, and West Group. The Company’s Cement business operates through the Cement segment. The Company’s Magnesia Specialties segment includes its magnesia-based chemicals and dolomitic lime businesses. Its Aggregates Business is engaged in mining, processing and selling granite, limestone, sand, gravel and other aggregate products. Its Cement business is engaged in producing Portland and specialty cements. In addition, aggregates products are used for railroad ballast and in agricultural, utility and environmental applications.

MARTIN MARIETTA MATERIALS, INC. (NYSE:MLM) Recent Trading Information

MARTIN MARIETTA MATERIALS, INC. (NYSE:MLM) closed its last trading session up +4.51 at 229.28 with 773,488 shares trading hands.