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AMT 424B2: Secondary offering

Filed with the SEC on · accession 0001193125-26-387901

AMT filed a 424B2 (prospectus (offering)) with the SEC on Sep 10, 2026. American Tower Corporation is offering $1.6 billion of senior notes in three tranches: $500 million of 5.300% notes due 2031, $500 million of 5.560% notes due 2033, and $600 million of 5.750% notes due 2036. The stock moved -1.4% by the first close after the filing.

Summary of the filing

American Tower Corporation is offering $1.6 billion of senior notes in three tranches: $500 million of 5.300% notes due 2031, $500 million of 5.560% notes due 2033, and $600 million of 5.750% notes due 2036. The offering is being made under a shelf registration statement.

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

Key details

Total offering amount$1.6B
2031 notes principal amount$500.0M
2033 notes principal amount$500.0M
2036 notes principal amount$600.0M
Net proceeds to issuer$1.6B
IssuerAmerican Tower Corporation
Joint book-running managerJ.P. Morgan
Joint book-running managerBofA Securities
Joint book-running managerCitigroup
Joint book-running managerMorgan Stanley
Joint book-running managerScotiabank

How AMT stock reacted

Close before

$175.43

Sep 9, 2026

First close after

-1.40%

$172.98

5 trading days

+0.55%

$176.39

Since filing

+7.74%

$189.00

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Frequently asked questions

What did AMT file with the SEC on Sep 10, 2026?

AMT filed a 424B2 (Secondary offering). American Tower Corporation is offering $1.6 billion of senior notes in three tranches: $500 million of 5.300% notes due 2031, $500 million of 5.560% notes due 2033, and $600 million of 5.750% notes due 2036. The offering is being made under a shelf registration statement.

What does a secondary offering mean for AMT 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 AMT stock react to this filing?

AMT closed at $175.43 before the filing and $172.98 on Sep 10, 2026 (-1.40%). Five trading days later: $176.39 (+0.55%).

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