MLM Martin Marietta Materials Inc

Prior to September 15, 2027 (three months prior to the maturity date of the 2027 fixed rate notes) (the “2027 Par Call Date”), make-whole call at any time at a discount rate of U.S. Treasury Rate plus 20 basis points (or 0.200%)

On or after the 2027 Par Call Date, at any time at a redemption price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of redemption

2047 FIXED RATE NOTES

Issuer:

Security:

Principal Amount:

Maturity Date:

Issue Price:

Benchmark Treasury:

Benchmark Treasury Price and Yield:

Spread to Benchmark Treasury:

Yield to Maturity:

Coupon (Interest Rate):

Interest Payment Dates:

Gross Proceeds to the Issuer:

Optional Redemption Provisions:

Prior to June 15, 2047 (six months prior to the maturity date of the 2047 fixed rate notes) (the “2047 Par Call Date”), make-whole call at any time at a discount rate of U.S. Treasury Rate plus 25 basis points (or 0.250%)

On or after the 2047 Par Call Date, at any time at a redemption price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of redemption

Day Count Convention:

CUSIP / ISIN:

FLOATING RATE NOTES, 2027 FIXED RATE NOTES AND 2047 FIXED RATE NOTES

Ratings:*

Trade Date:

Settlement Date:

December 20, 2017 (T+10)

We expect that delivery of the notes will be made to investors on or about December 20, 2017, which will be the tenth business day following the date of the prospectus supplement (such settlement cycle being referred to as “T+10”). Under Rule 15c6-1 under the Securities Exchange Act of 1934, as amended, trades in the secondary market are required to settle in two business days, unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers who wish to trade the notes any date prior to the second business day before delivery will be required, by virtue of the fact that the notes initially settle in T+10, to specify an alternate settlement arrangement at the time of any such trade to prevent a failed settlement. Purchasers of the notes who wish to trade the notes on the date of the prospectus supplement or the next seven succeeding business days should consult their advisors.

Legal Format:

Denominations:

Deutsche Bank Securities Inc.

J.P. Morgan Securities LLC

Wells Fargo Securities, LLC

BB&T Capital Markets, a division of BB&T Securities, LLC

SunTrust Robinson Humphrey, Inc.

Co-Managers:

PNC Capital Markets LLC

Regions Securities LLC

The Williams Capital Group, L.P.

MUFG Securities Americas Inc.

Comerica Securities, Inc.