# EDGAR Filing Document

**Accession Number:** 0001587732
**File Stem:** 0001193125-25-335291
**Filing Date:** 2025-12
**Character Count:** 4886
**Document Hash:** ad77359b08f0549e10415ae81d9b1833
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-335291.hdr.sgml**: 20251229

**ACCESSION NUMBER**: 0001193125-25-335291

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20251229

**ITEM INFORMATION**: Other Events

**FILED AS OF DATE**: 20251229

**DATE AS OF CHANGE**: 20251229

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ONE Gas, Inc.
- **CENTRAL INDEX KEY:** 0001587732
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS DISTRIBUTION [4924]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 463561936
- **STATE OF INCORPORATION:** OK
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36108
- **FILM NUMBER:** 251609133

**BUSINESS ADDRESS:**
- **STREET 1:** 15 EAST FIFTH STREET
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74103
- **BUSINESS PHONE:** 918-947-7000

**MAIL ADDRESS:**
- **STREET 1:** 15 EAST FIFTH STREET
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74103

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

### (Date of report) December 29, 2025

### (Date of earliest event reported) December 29, 2025

## ONE Gas, Inc.

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Oklahoma** | **001-36108** | **46-3561936** |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer<br>Identification Number)** |

---

#### 15 East Fifth Street

#### Tulsa, OK 74103

#### (Address of principal executive offices) (Zip Code)

#### Registrant's Telephone Number, including area code (918) 947-7000
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br> **symbol(s)** | **Name of each exchange<br>on which registered** |
| Common Stock, par value $0.01 per share | OGS | New York Stock Exchange |
| Indicate by check mark whether |  |  |
|  |  | NYSE Texas |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

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| | |
|:---|:---|
| **Item 8.01** | **<u>Other Events</u>**  |

---

Pursuant to the terms of a Forward Sale Agreement between ONE Gas, Inc. (the "**Company**") and Bank of America, N.A., as Forward Purchaser, dated as of September 11, 2023, as amended by an amendment dated as of December 27, 2024, the Company expects to settle and issue 223,000 shares of common stock on or before December 29, 2025.

Pursuant to the terms of a Forward Sale Agreement between the Company and Bank of America, N.A., as Forward Purchaser, dated as of September 15, 2023, as amended by an amendment dated as of December 27, 2024, the Company expects to settle and issue 180,000 shares of common stock on or before December 29, 2025.

Pursuant to the terms of a Forward Sale Agreement between the Company and JPMorgan Chase Bank, National Association, as Forward Purchaser, dated as of May 8, 2025, the Company expects to settle and issue 2,230,700 shares of common stock on or before December 29, 2025.

In the aggregate, the Company will receive net proceeds of approximately $205 million in conjunction with the three forward sale settlements.

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused the report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **ONE Gas, Inc.** | **ONE Gas, Inc.** |
|  | By: | /s/ Christopher P. Sighinolfi |
| Date: December 29, 2025 |  | Christopher P. Sighinolfi |
|  |  | Senior Vice President and Chief Financial Officer |

---