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MLM 424B2: Secondary offering

Martin Marietta Materials

Filed with the SEC on · accession 0001193125-26-349255

MLM filed a 424B2 (prospectus (offering)) with the SEC on Aug 13, 2026. The final terms of an offering of shares or bonds. The stock moved +0.2% by the first close after the filing.

Summary of the filing

Martin Marietta Materials issued $5.5 billion in senior notes across five tranches with maturities from 2029 to 2056, with proceeds used for general corporate purposes including the LNA Transaction.

For details, click here →How to read a 424B2 →

Key details

Total offering amount$5.5B
2029 notes principal$750.0M
2032 notes principal$1.3B
2034 notes principal$1.0B
2036 notes principal$1.5B
2056 notes principal$1.0B
Total proceeds before expenses$5.5B
Total underwriting discount$34.9M
Total net proceeds to issuer$5.5B
IssuerMartin Marietta Materials, Inc.
Joint book-running managerGoldman Sachs & Co. LLC
Joint book-running managerJ.P. Morgan
Joint book-running managerDeutsche Bank Securities
Joint book-running managerTruist Securities
Joint book-running managerPNC Capital Markets LLC
Joint book-running managerWells Fargo Securities
Joint book-running managerFirst Citizens Capital Securities
Joint book-running managerRegions Securities LLC
Co-managerFifth Third Securities
Co-managerLoop Capital Markets
Co-managerMorgan Stanley
Co-managerRBC Capital Markets

How MLM stock reacted

Close before

$543.90

Aug 12, 2026

First close after

+0.16%

$544.76

5 trading days

-1.54%

$535.53

Since filing

-4.73%

$518.15

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Frequently asked questions

What did MLM file with the SEC on Aug 13, 2026?

MLM filed a 424B2 (Secondary offering). Martin Marietta Materials issued $5.5 billion in senior notes across five tranches with maturities from 2029 to 2056, with proceeds used for general corporate purposes including the LNA Transaction.

What does a secondary offering mean for MLM stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B2?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B2 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did MLM stock react to this filing?

MLM closed at $543.90 before the filing and $544.76 on Aug 13, 2026 (+0.16%). Five trading days later: $535.53 (-1.54%).

Other MLM SEC filings

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