ATO 424B2: Secondary offering
Filed with the SEC on · accession 0001193125-26-417914
ATO filed a 424B2 (prospectus (offering)) with the SEC on Oct 8, 2026. The final terms of an offering of shares or bonds. The stock moved +0.9% by the first close after the filing.
Summary of the filing
Atmos Energy Corporation priced an offering of $700 million aggregate principal amount of 6.000% senior notes due 2036, with proceeds of approximately $692.9 million before expenses.
Key details
How ATO stock reacted
Close before
$159.21
Oct 7, 2026
First close after
+0.91%
$160.66
5 trading days
+2.97%
$163.94
Since filing
+8.80%
$173.22
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Click hereFrequently asked questions
What did ATO file with the SEC on Oct 8, 2026?
ATO filed a 424B2 (Secondary offering). Atmos Energy Corporation priced an offering of $700 million aggregate principal amount of 6.000% senior notes due 2036, with proceeds of approximately $692.9 million before expenses.
What does a secondary offering mean for ATO 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 ATO stock react to this filing?
ATO closed at $159.21 before the filing and $160.66 on Oct 8, 2026 (+0.91%). Five trading days later: $163.94 (+2.97%).
Other ATO SEC filings
- 8-K · SEC filingNov 4, 2026
- 8-K · Board changeNov 4, 2026
- 8-K · Material agreementOct 9, 2026
- 8-K · Secondary offeringOct 9, 2026
- 424B5 · Shelf registrationOct 6, 2026
- SCHEDULE 13G/A · SEC filingAug 13, 2026
- 8-K · Board changeAug 10, 2026
- 10-Q · SEC filingAug 5, 2026
- 8-K · SEC filingAug 5, 2026
- 8-K · Debt offeringJun 18, 2026
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