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MTZ 424B5: Secondary offering

Filed with the SEC on · accession 0001193125-26-342447

MTZ filed a 424B5 (prospectus (offering)) with the SEC on Aug 10, 2026. MasTec, Inc. is offering $650 million aggregate principal amount of 5.850% Senior Notes due 2036 in an underwritten public offering. The stock moved -1.5% by the first close after the filing.

Summary of the filing

MasTec, Inc. is offering $650 million aggregate principal amount of 5.850% Senior Notes due 2036 in an underwritten public offering. The notes are unsecured and will mature on September 30, 2036, with proceeds used for general corporate purposes.

For details, click here →How to read a 424B5 →

Key details

Aggregate principal amount of notes offered$650.0M
Public offering price (per note)$100
Total public offering price$647.8M
Underwriting discount$4.2M
Proceeds to MasTec before expenses$643.5M
IssuerMasTec, Inc.
Joint book-running managerPNC Capital Markets LLC
Joint book-running managerTruist Securities
Joint book-running managerWells Fargo Securities
Joint book-running managerBofA Securities
Joint book-running managerJ.P. Morgan
Joint book-running managerBMO Capital Markets
Joint book-running managerCitizens Capital Markets
Joint book-running managerMorgan Stanley
Joint book-running managerUS Bancorp
Senior co-managerCapital One Securities
Senior co-managerKeyBanc Capital Markets
Co-managerBBVA

How MTZ stock reacted

Close before

$272.46

Aug 7, 2026

First close after

-1.53%

$268.28

5 trading days

+9.22%

$297.59

Since filing

-36.10%

$174.10

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Frequently asked questions

What did MTZ file with the SEC on Aug 10, 2026?

MTZ filed a 424B5 (Secondary offering). MasTec, Inc. is offering $650 million aggregate principal amount of 5.850% Senior Notes due 2036 in an underwritten public offering. The notes are unsecured and will mature on September 30, 2036, with proceeds used for general corporate purposes.

What does a secondary offering mean for MTZ stock?

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

How do I read a 424B5?

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 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did MTZ stock react to this filing?

MTZ closed at $272.46 before the filing and $268.28 on Aug 10, 2026 (-1.53%). Five trading days later: $297.59 (+9.22%).

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