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Offerings // AMERICAN TOWER CORP /MA/

AMT offering history

Every offering-related filing in AMERICAN TOWER CORP /MA/’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,003 filings back to May 31, 2017.

Last executed offering
Nov 9, 2026
424B5 — priced deal (shares or notes)
Last registration (announced)
Jun 2, 2025
S-3ASR — capacity, not a sale
Executed, last 12 months
7
424B pricings + 8-K 3.02 sales
Registered, last 12 months
0
S-1/S-3/F-series registrations
DateFilingWhat it means
Nov 9, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 9, 2026FWP →MARKETINGFree-writing prospectus — offering being marketed
Sep 10, 2026424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 9, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 9, 2026FWP →MARKETINGFree-writing prospectus — offering being marketed
May 20, 2026424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
May 19, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 19, 2026FWP →MARKETINGFree-writing prospectus — offering being marketed
Dec 3, 2025424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Dec 2, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 2, 2025FWP →MARKETINGFree-writing prospectus — offering being marketed
Sep 12, 2025424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 11, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 11, 2025FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 2, 2025S-3ASR →REGISTEREDAutomatic shelf registration — effective immediately (large filers)
May 22, 2025424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
May 21, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 21, 2025FWP →MARKETINGFree-writing prospectus — offering being marketed
Mar 12, 2025424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Mar 11, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 11, 2025FWP →MARKETINGFree-writing prospectus — offering being marketed
Nov 19, 2024FWP →MARKETINGFree-writing prospectus — offering being marketed
Nov 19, 2024424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Nov 18, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 23, 2024424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
May 22, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 22, 2024FWP →MARKETINGFree-writing prospectus — offering being marketed
Mar 5, 2024424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Mar 4, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 4, 2024FWP →MARKETINGFree-writing prospectus — offering being marketed
Oct 27, 2023424B8 →UPDATEResale prospectus — existing holders registering to sell
Sep 13, 2023424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 12, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 12, 2023FWP →MARKETINGFree-writing prospectus — offering being marketed
May 23, 2023424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
May 22, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 22, 2023FWP →MARKETINGFree-writing prospectus — offering being marketed
May 10, 2023424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
May 9, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 9, 2023FWP →MARKETINGFree-writing prospectus — offering being marketed
AMT offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

Two honest limits. (1) A 424B takedown can price shares or notes — EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.

Is a shelf active now? →Do they need money? →Red flags →Full AMT workspace →
AMT offering FAQ

When did AMT last execute an offering?

Per SEC filings, AMERICAN TOWER CORP /MA/'s most recent priced offering document is a 424B5 filed 2026-11-09. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did AMT last announce or register an offering?

The most recent registration is a S-3ASR filed 2025-06-02. A registration is capacity to sell shares — not a sale.

Does an offering always mean dilution?

Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.

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