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Offerings // ATMOS ENERGY CORP

ATO offering history

Every offering-related filing in ATMOS ENERGY CORP’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,003 filings back to Mar 10, 2015.

Last executed offering
Oct 8, 2026
424B2 — priced deal (shares or notes)
Last registration (announced)
Dec 3, 2024
S-3ASR — capacity, not a sale
Executed, last 12 months
4
424B pricings + 8-K 3.02 sales
Registered, last 12 months
0
S-1/S-3/F-series registrations
DateFilingWhat it means
Oct 8, 2026424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Oct 6, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 6, 2026FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 17, 2026424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Jun 16, 2026FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 15, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 5, 2026424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Sep 22, 2025424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 18, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 18, 2025FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 18, 2025424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Jun 16, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jun 16, 2025FWP →MARKETINGFree-writing prospectus — offering being marketed
Dec 3, 2024S-3ASR →REGISTEREDAutomatic shelf registration — effective immediately (large filers)
Dec 3, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 19, 2024424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 17, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 17, 2024FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 20, 2024FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 20, 2024424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Jun 18, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 8, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 10, 2023424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Oct 5, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 5, 2023FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 14, 2023424B1 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Jun 14, 2023424B8 →UPDATEResale prospectus — existing holders registering to sell
Jun 12, 2023FWP →MARKETINGFree-writing prospectus — offering being marketed
Jun 8, 2023EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jun 7, 2023FWP →MARKETINGFree-writing prospectus — offering being marketed
Mar 31, 2023S-3ASR →REGISTEREDAutomatic shelf registration — effective immediately (large filers)
Mar 31, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 14, 2022424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Sep 29, 2022424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 28, 2022FWP →MARKETINGFree-writing prospectus — offering being marketed
Sep 27, 2022424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 23, 2022424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 13, 2022424B2 →EXECUTEDProspectus supplement priced — shares or notes (large filers: often a bond deal)
Jan 12, 2022FWP →MARKETINGFree-writing prospectus — offering being marketed
Jan 11, 2022424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
ATO 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 ATO workspace →
ATO offering FAQ

When did ATO last execute an offering?

Per SEC filings, ATMOS ENERGY CORP's most recent priced offering document is a 424B2 filed 2026-10-08. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did ATO last announce or register an offering?

The most recent registration is a S-3ASR filed 2024-12-03. 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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