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OGS 424B5: Secondary offering

Filed with the SEC on · accession 0001193125-26-347036

OGS filed a 424B5 (prospectus (offering)) with the SEC on Aug 12, 2026. ONE Gas, Inc. is offering $375,000,000 aggregate principal amount of 5.45% Notes due 2036 in an underwritten public offering. The stock moved +1.0% by the first close after the filing.

Summary of the filing

ONE Gas, Inc. is offering $375,000,000 aggregate principal amount of 5.45% Notes due 2036 in an underwritten public offering. The notes will mature on September 1, 2036, and bear interest at 5.45% per year, payable semi-annually.

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

Key details

Aggregate principal amount of notes offered$375.0M
Total offering price to public$373.8M
Underwriting discount$2.4M
Proceeds to issuer before expenses$371.3M
IssuerONE Gas, Inc.
Joint book-running managerBofA Securities
Joint book-running managerRBC Capital Markets
Joint book-running managerTruist Securities
Co-managerJ.P. Morgan
Co-managerMizuho
Co-managerUS Bancorp
Co-managerBOK Financial Securities, Inc.
Co-managerFifth Third Securities
Co-managerHuntington Capital Markets

How OGS stock reacted

Close before

$79.60

Aug 11, 2026

First close after

+0.98%

$80.38

5 trading days

+1.82%

$81.05

Since filing

+1.66%

$80.92

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Frequently asked questions

What did OGS file with the SEC on Aug 12, 2026?

OGS filed a 424B5 (Secondary offering). ONE Gas, Inc. is offering $375,000,000 aggregate principal amount of 5.45% Notes due 2036 in an underwritten public offering. The notes will mature on September 1, 2036, and bear interest at 5.45% per year, payable semi-annually.

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

OGS closed at $79.60 before the filing and $80.38 on Aug 12, 2026 (+0.98%). Five trading days later: $81.05 (+1.82%).

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