Filed Pursuant to Rule 424(b)(5)
Registration No. 333-238199
The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has become effective upon filing with the Securities and Exchange Commission. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.
Subject to completion, dated June 21, 2021
Preliminary prospectus supplement
(To prospectus dated May 12, 2020)

$
Martin Marietta Materials, Inc.
$ % Senior Notes due 2023
$ % Senior Notes due 2031
$ % Senior Notes due 2051
Martin Marietta Materials, Inc. is offering $ aggregate principal amount of its % Senior Notes due 2023 (the “2023 notes”), $ aggregate principal amount of its % Senior Notes due 2031 (the “2031 notes”) and $ aggregate principal amount of its % Senior Notes due 2051 (the “2051 notes” and, together with the 2023 notes and the 2031 notes, the “notes”). The 2023 notes will accrue interest from, and including, , 2021 at a per annum rate of %, and will be payable in arrears on and of each year, beginning on . The 2031 notes will accrue interest from, and including, , 2021 at a per annum rate of %, and will be payable in arrears on and of each year, beginning on . The 2051 notes will accrue interest from, and including, , 2021 at a per annum rate of %, and will be payable in arrears on and of each year, beginning on . The 2023 notes will mature on , 2023, the 2031 notes will mature on , 2031 and the 2051 notes will mature on , 2051.
We have the option to redeem some or all of the notes prior to their stated maturity date at any time and from time to time, as described under the heading “Description of the notes—Optional redemption.” If a Change of Control Repurchase Event (as defined herein) occurs, we will be required to offer to repurchase all of the outstanding notes at a repurchase price equal to 101% of their principal amount, plus unpaid interest, if any, accrued thereon to, but excluding, the date of repurchase, unless we have exercised our right to redeem the notes in full. See “Description of the notes—Change of Control Repurchase Event.”
The closing of this offering is not conditioned upon the consummation of the Acquisition (as defined herein), which, if consummated, will occur subsequent to the closing of this offering. If (i) the Acquisition is not consummated prior to March 31, 2022, (ii) the Purchase Agreement (as defined herein) is terminated at any time prior to March 31, 2022 (other than as a result of consummating the Acquisition) or (iii) we publicly announce at any time prior to March 31, 2022 that we will no longer pursue the consummation of the Acquisition, then we will be required to redeem all of the outstanding 2031 notes and 2051 notes pursuant to a special mandatory redemption at a redemption price equal to 101% of the aggregate principal amount of the 2031 notes and the 2051 notes, respectively, plus accrued and unpaid interest to, but excluding, the Special Mandatory Redemption Date (as defined herein). There is no escrow account for, or security interest in, the proceeds from the sales of the 2031 notes or the 2051 notes for the benefit of holders of the 2031 notes or the 2051 notes. The 2023 notes will not be subject to the special mandatory redemption provisions described above. See “Description of the notes—Special mandatory redemption.”
The notes will be our senior unsecured obligations, will rank equally in right of payment with all of our existing and future senior indebtedness and will rank senior in right of payment to all of our future subordinated indebtedness. The notes will be effectively subordinated to all of our existing and future secured indebtedness to the extent of the value of the assets securing such indebtedness. The notes will not be guaranteed by any of our subsidiaries and will be structurally subordinated to all of the existing and future indebtedness and other liabilities (including trade accounts payable) and preferred equity of our subsidiaries.
Investing in the notes involves risks. See “Risk factors” beginning on page S-20 for a discussion of certain risks that you should consider in connection with an investment in the notes.
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| | Public offering price(1) | | | Underwriting discount | | | Proceeds, before expenses, to Martin Marietta(1) | |
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Per 2023 note | | | | | | | % | | | | | | | | % | | | | | | | | % | |
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Total | | $ | | | | | | | | $ | | | | | | | | $ | | | | | | |
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Per 2031 note | | | | | | | % | | | | | | | | % | | | | | | | | % | |
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Total | | $ | | | | | | | | $ | | | | | | | | $ | | | | | | |
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Per 2051 note | | | | | | | % | | | | | | | | % | | | | | | | | % | |
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Total | | $ | | | | | | | | $ | | | | | | | | $ | | | | | | |
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Total | | $ | | | | | | | | $ | | | | | | | | $ | | | | | | |
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(1) | | Plus accrued interest, if any, from , 2021. |
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the notes or determined if this prospectus supplement or the accompanying base prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
We do not intend to apply to list the notes on any securities exchange or to arrange for the notes to be quoted on any automated interdealer quotation system.
We expect to deliver the notes to investors through the book-entry delivery system of The Depository Trust Company and its direct participants, including Euroclear Bank S.A./N.V. and Clearstream Banking, société anonyme, against payment, on or about , 2021.
Joint book-running managers
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Deutsche Bank Securities | | J.P. Morgan | | Truist Securities | | | Wells Fargo Securities | |
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Prospectus supplement, dated , 2021 | |