# EDGAR Filing Document

**Accession Number:** 0000731802
**File Stem:** 0000731802-26-000092
**Filing Date:** 2026-6
**Character Count:** 37055
**Document Hash:** 2e1e5bd16e77bf8ff6b7e62853e56b3f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000731802-26-000092.hdr.sgml**: 20260625

**ACCESSION NUMBER**: 0000731802-26-000092

**CONFORMED SUBMISSION TYPE**: 11-K

**PUBLIC DOCUMENT COUNT**: 30

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260625

**DATE AS OF CHANGE**: 20260625

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ATMOS ENERGY CORP
- **CENTRAL INDEX KEY:** 0000731802
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS DISTRIBUTION [4924]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 751743247
- **STATE OF INCORPORATION:** TX
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 11-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-10042
- **FILM NUMBER:** 261121224

**BUSINESS ADDRESS:**
- **STREET 1:** 1800 THREE LINCOLN CTR
- **STREET 2:** 5430 LBJ FREEWAY
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75240
- **BUSINESS PHONE:** 9729349227

**MAIL ADDRESS:**
- **STREET 1:** 1800 THREE LINCOLN CTR
- **STREET 2:** 5430 LBJ FREEWAY
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75240

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ENERGAS CO
- **DATE OF NAME CHANGE:** 19881024

?xml version='1.0' encoding='ASCII'? ato-20260625

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM 11-K**

**FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS**

**AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF**

**THE SECURITIES EXCHANGE ACT OF 1934**

**(Mark One)**

---

| | |
|:---|:---|
| 🗷 | **ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934** |

---

**For the fiscal year ended December 31, 2025** 

**OR**

---

| | |
|:---|:---|
| ◻ | **TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934** |

---

**For the transition period from<u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</u> to<u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</u>**

**Commission File Number 33-57687**

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**(Full title of the plan and the address of the**

**plan, if different from that of the issuer named below)**

**ATMOS ENERGY CORPORATION**

**Three Lincoln Centre, Suite 1800**

**5430 LBJ Freeway**

**Dallas, Texas 75240**

**(Name of issuer of the securities held pursuant to the plan and the**

**address of its principal executive office)**

------

**TABLE OF CONTENTS**

---

| | |
|:---|:---|
|  | **Page<br>Number** |
| <u>[Report of Independent Registered Public Accounting Firm](#i9772b8741e544fccacafae50c8c8f284_7)</u> | <u>[2](#i9772b8741e544fccacafae50c8c8f284_7)</u> |
| Audited Financial Statements: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>[Statements of Net Assets Available for Benefits](#i9772b8741e544fccacafae50c8c8f284_10)</u> | <u>[3](#i9772b8741e544fccacafae50c8c8f284_10)</u> |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>[Statement of Changes in Net Assets Available for Benefits](#i9772b8741e544fccacafae50c8c8f284_13)</u> | <u>[4](#i9772b8741e544fccacafae50c8c8f284_13)</u> |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>[Notes to Financial Statements](#i9772b8741e544fccacafae50c8c8f284_16)</u> | <u>[5](#i9772b8741e544fccacafae50c8c8f284_16)</u> |
| Supplemental Schedule: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>[Form 5500, Schedule H, Line 4i – Schedule of Assets (Held At End of Year)](#i9772b8741e544fccacafae50c8c8f284_37)</u> | <u>[11](#i9772b8741e544fccacafae50c8c8f284_37)</u> |
| <u>[Signatures](#i9772b8741e544fccacafae50c8c8f284_40)</u> | <u>[12](#i9772b8741e544fccacafae50c8c8f284_40)</u> |
| <u>[Exhibits Index](#i9772b8741e544fccacafae50c8c8f284_43)</u> | <u>[13](#i9772b8741e544fccacafae50c8c8f284_43)</u> |

---

------

**REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

To the Participants and the Qualified Retirement Plans and Trusts Committee of the

Atmos Energy Corporation Retirement Savings Plan and Trust

**Opinion on the Financial Statements**

We have audited the accompanying statements of net assets available for benefits of the Atmos Energy Corporation Retirement Savings Plan and Trust (the "Plan") as of December 31, 2025 and 2024, and the related statement of changes in net assets available for benefits for the year ended December 31, 2025, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2025 and 2024, and the changes in net assets available for benefits for the year ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.

**Basis for Opinion**

These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on the Plan's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

**Supplemental Information**

The supplemental information in the accompanying schedule of Form 5500, Schedule H, Line 4i – Schedule of Assets (Held at End of Year) as of December 31, 2025, has been subjected to audit procedures performed in conjunction with the audit of the Plan's financial statements. The supplemental information is the responsibility of the Plan's management. Our audit procedures included determining whether the supplemental information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information, we evaluated whether the supplemental information, including its form and content, is presented in conformity with the Department of Labor's Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental information is fairly stated, in all material respects, in relation to the financial statements as a whole.

We have served as the Plan's auditor since 2006.

/s/ Whitley Penn LLP

Dallas, Texas

June 25, 2026

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS**

---

| | | |
|:---|:---|:---|
| | **December 31** | **December 31** |
| | **2025** | **2024** |
| **Assets** |  |  |
| Total investments | $1258588095 | $1118693461 |
| Receivables: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Due from broker | 175767 | 1106 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Notes receivable from participants | 20498881 | 17922148 |
| Total receivables | 20674648 | 17923254 |
| Total assets | 1279262743 | 1136616715 |
| Net assets available for benefits | $1279262743 | $1136616715 |

---

See accompanying notes

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS**

**Year ended December 31, 2025** 

---

| | |
|:---|:---|
| **Additions to Net Assets** | **Additions to Net Assets** |
| &nbsp;&nbsp;&nbsp;Investment income: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net appreciation in fair value of investments | $129921858 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividends on common stock | 6359614 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividends on registered investment companies | 49142427 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividends on common/collective trust | 1151723 |
| &nbsp;&nbsp;&nbsp;Total investment income | 186575622 |
| &nbsp;&nbsp;&nbsp;Other income: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest received on notes receivable from participants | 1804200 |
| &nbsp;&nbsp;&nbsp;Contributions: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Participants | 45529623 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Company | 36549942 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rollovers | 3592162 |
| &nbsp;&nbsp;&nbsp;Total contributions | 85671727 |
| &nbsp;&nbsp;&nbsp;Total additions to net assets | 274051549 |
| **Deductions from Net Assets** |  |
| &nbsp;&nbsp;&nbsp;Distributions to participants | 131084254 |
| &nbsp;&nbsp;&nbsp;Administrative expenses | 321267 |
| &nbsp;&nbsp;&nbsp;Total deductions from net assets | 131405521 |
| Net increase in net assets available for benefits | 142646028 |
| **Net Assets Available for Benefits** |  |
| &nbsp;&nbsp;&nbsp;Beginning of year | 1136616715 |
| &nbsp;&nbsp;&nbsp;End of year | $1279262743 |

---

See accompanying notes

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**NOTES TO FINANCIAL STATEMENTS**

**December 31, 2025**

**1. Description of the Plan**

The following brief description of the Atmos Energy Corporation Retirement Savings Plan and Trust (the Plan) is provided for general information only. Participants should refer to the Summary Plan Description for a more detailed description of the Plan's provisions.

***General***

The Plan is a trusteed defined contribution retirement benefit plan offered to eligible employees of Atmos Energy Corporation (the Company, Atmos Energy or Plan Sponsor). The Plan is to continue for an indefinite term and may be amended or terminated at any time by the Board of Directors of Atmos Energy (the Board). The Plan is administered by the Qualified Retirement Plans and Trusts Committee (the Committee), which is appointed by the Board. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (ERISA).

***Eligibility***

Substantially all employees of the Company, other than leased employees (Participants), are automatically enrolled in the Plan at a pre-tax salary deferral rate of five percent (5%) of their compensation. Participants have a 30-day period to opt out of automatic enrollment. After 30 days, if the Participant has not opted out or elected a different deferral percentage, salary deferrals begin at the automatic enrollment level of 5%. Effective January 1, 2026, the automatic enrollment level increased from 5% to 6%.

***Contributions***

Contributions to the Plan include contributions withheld by the Company on behalf of each Participant in an amount specified by the Participant pursuant to a salary deferral agreement, as well as matching and fixed annual Company contributions.

Participants may elect a Pre-Tax or Roth deferral rate ranging from a minimum of one percent (1%) up to a maximum of 65 percent (65%) of eligible compensation, as defined by the Plan, not to exceed the maximum allowed by the Internal Revenue Code (the Code) ($23,500 in 2025 or $31,000 for those participants age 50 or older). Effective January 1, 2025, participants age 60 to 63 have an increased catch-up limit in compliance with the SECURE 2.0 Act. Additionally, the Plan includes an automatic increase provision where each Participant who contributes less than 10% as an elective pre-tax deferral will have their contribution percent increased by 1% each Plan year unless the Participant opts out of the automatic increase feature.

The Company contributes a matching Company contribution in an amount equal to 100 percent of each Participant's salary deferral contribution, up to a maximum of 5% of such Participant's eligible compensation, as defined by the Plan, for the Plan year. The Company's matching contribution meets the current Internal Revenue Service (IRS) "Safe Harbor" definition. The Company may revoke or amend any Participant's salary deferral agreement if necessary to ensure that (1) each Participant's salary deferrals for any year will not exceed applicable Code limitations and (2) Company matching contributions will be fully deductible for federal income tax purposes. The Company matching contributions are in accordance with the Participant's investment elections, subject to a 25 percent limit for Atmos Energy common stock as described below. For the year ended December 31, 2025, the Company made matching Company contributions of $24,682,238. Effective January 1, 2026, the Company increased the matching Company contribution from 5% to 6%.

Additionally, employees who joined the Plan subsequent to September 30, 2010 receive a fixed annual Company contribution of 4% of eligible compensation to their Plan account. During the year ended December 31, 2025, the Company made fixed annual contributions of $11,867,704.

Participants are eligible to receive matching contributions immediately upon entering the Plan. Participants are eligible to receive fixed annual Company contributions after completing at least one year of service, effective on the first full pay period after which one year of service has been completed. Employee deferral contributions are immediately and fully vested, while the Company's matching contributions fully vest after one year of service and the fixed annual Company contributions fully vest after three years of service.

The Plan allows for in-plan rollovers and permits elective deferrals, including Roth, to be rolled into the Plan.

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**NOTES TO FINANCIAL STATEMENTS *(continued)***

***Forfeitures***

Forfeitures are first used to fund any restorations of previously forfeited fixed annual Company contributions of former participants that are rehired. Any remaining forfeitures are used to reduce fixed annual Company contributions.

***Investment Options***

The Plan allows Participant salary deferral contributions to be invested among a variety of registered investment companies, one common/collective trust (CCT) and Atmos Energy common stock.

Investments in Atmos Energy common stock are participant directed. All Participant and Company contributions made in Atmos Energy common stock are allowed to be diversified at any time after the contribution is made into one or more of the other investment options offered by the Plan.

To help participants achieve better diversification, a participant's investment elections may not have an allocation greater than 25 percent to Atmos Energy common stock. In addition, future exchanges or rollovers into Atmos Energy common stock will be limited to 25 percent of the participant's total account balance. After a participant reaches the 25 percent limit, future contributions will be made in cash according to the participant's other investment elections.

***Distributions to Participants***

Dividends received on Atmos Energy common stock are automatically reinvested in Atmos Energy common stock. However, a Participant may elect to receive dividends paid in cash. This election may be made at any time during the period beginning on the first business day on or after the dividend record date and ending at a time specified by the Committee on the last business day preceding the dividend payout date. Cash dividends received on Atmos Energy common stock, in accordance with the Plan, must be distributed to Participants no later than 90 days after the Plan's year end. Currently, the dividends are distributed quarterly. Once a Participant elects to receive dividends in cash, the election will remain in effect until the election is changed.

In the event of retirement, death, termination due to disability or termination of employment for another reason, a Participant, or beneficiary in the event of death, is entitled to withdraw their account from the Plan. At the time of termination, Participants who do not have Plan loans outstanding are entitled to take one or more partial distributions from their account.

Withdrawals from a Participant's salary deferral account are allowed upon proof of financial hardship meeting IRS "Safe Harbor" definitions. Hardship withdrawals are not permitted from the Company matching or fixed annual Company contribution accounts.

If elected, subsequent to the Participant attaining age 59 <sup>1</sup>/2, withdrawals may be made from a Participant's salary deferral account as well as the vested portion of the Company matching account; however, withdrawals may not be made from the fixed annual Company contribution account. Withdrawals of investments in Atmos Energy common stock may be in the form of Atmos Energy common stock or cash, as determined by the Committee, at the Participant's discretion.

A Participant may elect to receive a distribution of non-safe harbor prior company matching or discretionary contributions made to their account at least two years prior to such election. Safe harbor Company matching contributions meet the current IRS "Safe Harbor" definition and are not eligible for in-service withdrawal.

***Loans to Participants***

A Participant may borrow up to the lesser of $50,000 or 50 percent of their account balance, with a minimum loan amount of $1,000. Loans are repaid through payroll deductions over periods of up to five years for general purpose loans or 15 years for primary residence loans. The interest rate is the U.S. prime rate plus 2 percent and is fixed over the life of the loan. A Participant may only have one loan outstanding.

If a Participant has an outstanding loan in force and terminates employment, the Participant may elect to continue to pay the loan according to the payment schedule that was set up at the time the loan was initiated. If this option is elected, the Participant must also leave their account balance in the Plan. Under a second option, the Participant may elect to have the outstanding loan balance treated as a distribution from the Plan. A third option provides that the Participant may repay the loan in full within the date range established by IRS rules and stated in the Plan's loan policy.

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**NOTES TO FINANCIAL STATEMENTS *(continued)***

***Plan Termination***

While the Company has not expressed any intent to terminate the Plan, it is free to do so at any time. In the event of the dissolution, merger, consolidation or reorganization of the Company, the Plan will terminate and the trust will be liquidated, unless the Plan is continued by a successor. Upon such liquidation, all accounts shall be fully vested and will be distributed to the Participants.

**2. Summary of Significant Accounting Policies**

***Basis of Presentation***

The financial statements of the Plan are prepared on the accrual basis of accounting. Distributions to Participants are recorded when paid.

***Use of Estimates&nbsp;&nbsp;&nbsp;&nbsp;***

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

***Investment Valuation and Income Recognition***

Shares of registered investment companies are valued at fair value based on published market prices, which represents the net asset value of shares held by the Plan at year end. Investments in common stock are valued at fair value based on quoted market prices.

The CCT is comprised primarily of fully benefit-responsive investment contracts, which include conventional, synthetic and separate account investment contracts issued by life insurance companies, banks and other financial institutions, designed to provide principal stability and a competitive yield. The CCT is valued at the net asset value of units of the T. Rowe Price Trust Company (T. Rowe Price) collective trust. The net asset value is used as a practical expedient to estimate fair value. The practical expedient would not be used if it is determined to be probable that the fund will sell the investment for an amount different from the reported net asset value. Participant transactions (purchases and sales) may occur daily. If the Plan initiates a full redemption of the collective trust, the issuer reserves the right to require 12 months' notification in order to ensure that securities liquidations will be carried out in an orderly business manner.

The fair value methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Committee believes the valuation methods used are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain assets could result in a different fair value measurement at the measurement date.

Purchases and sales of securities are recorded on a trade date basis. Investment income is recorded on the accrual basis and dividend income is recorded on the ex-dividend date. Realized gains and losses from securities transactions are reported on the average historical cost method. Capital gains and losses are included in interest and dividend income.

***Notes Receivable from Participants***

Notes receivable from participants represent Participant loans that are recorded at their remaining outstanding balance plus any accrued but unpaid interest. Interest income on notes receivable from participants is recorded when earned.

***Subsequent Events***

We have evaluated subsequent events from the December 31, 2025 statement of net assets available for benefits date through June 25, 2026, the date these financial statements were issued. No events occurred subsequent to the statement of net assets available for benefits date that would require recognition or disclosure in the financial statements.

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**NOTES TO FINANCIAL STATEMENTS *(continued)***

**3. Administration of the Plan and Plan Assets**

The Plan is administered by the Committee, consisting of at least three persons who are appointed by the Board. The members of the Committee serve at the appointment of the Board without compensation from the Plan. Certain administrative functions are performed by employees of the Company. No employee of the Company receives compensation from the Plan.

In accordance with the Plan, the Company has appointed the Committee as Trustee of the Plan. The Trustee may be removed at the discretion of the Board. The Trustee shall vote any common stock held in the trust in accordance with directions received from the Participants or at its discretion if there are no such directions. The Plan's assets are held by T. Rowe Price, the custodian and recordkeeper of the Plan.

Generally, administrative expenses of the Plan are paid by the Company except for processing fees related to loans to participants, which are paid by the Participant.

**4. Fair Value Measurements**

Authoritative accounting literature establishes a fair value hierarchy that prioritizes the inputs used to measure fair value based on observable and unobservable data. The hierarchy categorizes the inputs into three levels, with the highest priority given to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority given to unobservable inputs (Level 3). The asset's fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The levels of the hierarchy are described below:

Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities. An active market for the asset is defined as a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. The Plan's Level 1 measurements consist of registered investment companies (mutual funds) and common stock.

Level 2 — Inputs other than quoted prices included in Level 1 that are either directly or indirectly observable for the asset as of the reporting date. These inputs are derived principally from, or corroborated by, observable market data. Currently, the Plan has no assets recorded at fair value that would qualify for Level 2 reporting.

Level 3 — Unobservable inputs that are supported by little, if any, market activity and are significant to the fair value of the assets as of the measurement date. Currently, the Plan has no assets recorded at fair value that would qualify for Level 3 reporting.

The Plan records accounts receivable and accounts payable at carrying value, which substantially approximates fair value due to the short-term nature of these assets.

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**NOTES TO FINANCIAL STATEMENTS *(continued)***

The following table sets forth by level, within the fair value hierarchy, the Plan's investments at fair value as of December 31, 2025 and 2024:

---

| | | | | |
|:---|:---|:---|:---|:---|
| | **Investments at Fair Value as of December 31, 2025** | **Investments at Fair Value as of December 31, 2025** | **Investments at Fair Value as of December 31, 2025** | **Investments at Fair Value as of December 31, 2025** |
| | **Level 1** | **Level 2** | **Level 3** | **Total** |
| &nbsp;&nbsp;&nbsp;Registered investment companies | $938942865 | $— | $— | $938942865 |
| &nbsp;&nbsp;&nbsp;Common stock | 282275815 |  |  | 282275815 |
| Total investments in the fair value hierarchy | $1221218680 | $— | $— | 1221218680 |
| Investments measured at net asset value <sup>(1)</sup> |  |  |  | 37369415 |
| Investments at fair value |  |  |  | $1258588095 |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
| | **Investments at Fair Value as of December 31, 2024** | **Investments at Fair Value as of December 31, 2024** | **Investments at Fair Value as of December 31, 2024** | **Investments at Fair Value as of December 31, 2024** |
| | **Level 1** | **Level 2** | **Level 3** | **Total** |
| &nbsp;&nbsp;&nbsp;Registered investment companies | $818292564 | $— | $— | $818292564 |
| &nbsp;&nbsp;&nbsp;Common stock | 258032081 |  |  | 258032081 |
| Total investments in the fair value hierarchy | $1076324645 | $— | $— | 1076324645 |
| Investments measured at net asset value <sup>(1)</sup> |  |  |  | 42368816 |
| Investments at fair value |  |  |  | $1118693461 |

---

&nbsp;&nbsp;&nbsp;&nbsp;<sup>(1)</sup>Investments in our CCT that are measured at net asset value per share equivalent are not classified in the fair value hierarchy. The fair value amounts presented are intended to reconcile the fair value hierarchy to the line items presented in the statement of net assets available for benefits.

The following table summarizes investments for which fair value is measured using the net asset value per share practical expedient as of December 31, 2025 and 2024, respectively. There are no participant redemption restrictions for these investments; the redemption notice period is applicable only to the Plan.

---

| | | | | |
|:---|:---|:---|:---|:---|
| **December 31, 2025** | **Fair Value** | **Unfunded Commitments** | **Redemption Frequency (if Currently Eligible)** | **Redemption Notice Period** |
| T. Rowe Price Stable Value Common Trust Fund | $37369415 | n/a | Daily | 12 months |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
| **December 31, 2024** | **Fair Value** | **Unfunded Commitments** | **Redemption Frequency (if Currently Eligible)** | **Redemption Notice Period** |
| T. Rowe Price Stable Value Common Trust Fund | $42368816 | n/a | Daily | 12 months |

---

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**NOTES TO FINANCIAL STATEMENTS *(continued)***

**5. Related Party and Party-in-Interest Transactions**

Certain Plan investments in registered investment companies and a common/collective trust fund are managed by T. Rowe Price. T. Rowe Price is the custodian and recordkeeper; therefore, these transactions qualify as party-in-interest transactions. Additionally, certain Plan participants have invested in Atmos Energy common stock. Because the Company is the Plan Sponsor, transactions involving Atmos Energy common stock qualify as party-in-interest and related party transactions. The Plan also issues loans to participants. All of these party-in-interest transactions are exempt from the prohibited transaction rules. At December 31, 2025 and 2024, participant accounts held 1,683,922 and 1,852,747 shares of Atmos Energy common stock and received $6,359,614 in dividends from Atmos Energy common stock during 2025. All other transactions which may be considered party-in-interest transactions relate to normal plan management and administrative services and the related payment of fees.

At December 31, 2025 and 2024, the percentage of the Plan's investments held in the Company's common stock was 22.4% and 23.1%.

**6. Income Tax Status**

The Plan has received a determination letter from the IRS dated August 20, 2014 stating that the Plan is qualified under Section 401(a) of the Code; therefore, the related trust is exempt from taxation. Subsequent to this determination by the IRS, the Plan was amended. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan administrator believes the Plan is being operated in compliance with the applicable requirements of the Code and therefore believes that the Plan, as amended, is qualified and the related trust is tax-exempt.

**7. Risks and Uncertainties**

The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect Participant account balances and the amounts reported in the Statements of Net Assets Available for Benefits and the Statement of Changes in Net Assets Available for Benefits.

------

**ATMOS ENERGY CORPORATION RETIREMENT**

**SAVINGS PLAN AND TRUST**

**Form 5500, SCHEDULE H, LINE 4i -**

**SCHEDULE OF ASSETS (HELD AT END OF YEAR)**

**EIN: 75-1743247**

**PLAN NUMBER: 002**

**December 31, 2025** 

---

| | | | | |
|:---|:---|:---|:---|:---|
| **(a)** | **(b)<br>Identity of issue,<br>borrower, lessor<br>or similar party** | **(c)<br>Description of investment<br>including maturity date,<br>rate of interest, collateral,<br>par or maturity value** | **(d)<br>Cost** | **(e)<br>Current<br>value** |
| \* | Atmos Energy Corporation | Common stock; 1,683,922 shares | \*\* | $282275815 |
| \* | T. Rowe Price Trust Company | Stable Value Common Trust Fund | \*\* | 37369415 |
| \* | T. Rowe Price Trust Company | Balanced Fund I Class | \*\* | 22909781 |
| \* | T. Rowe Price Trust Company | Short-Term Bond Fund I Class | \*\* | 6812957 |
| \* | T. Rowe Price Trust Company | New Horizons Fund I Class | \*\* | 32015660 |
| \* | T. Rowe Price Trust Company | Mid-Cap Value Fund I Class | \*\* | 54796913 |
| \* | T. Rowe Price Trust Company | All-Cap Opportunities Fund I Class | \*\* | 37810558 |
| \* | T. Rowe Price Trust Company | Equity Income Fund I Class | \*\* | 46319567 |
|  | Baird | Aggregate Bond Institutional Fund | \*\* | 27634324 |
|  | Vanguard Group, Inc. | Vanguard Institutional Index Fund | \*\* | 106608504 |
|  | Vanguard Group, Inc. | Vanguard Ttl Int Stock Institutional Index Fund | \*\* | 32076843 |
|  | Vanguard Group, Inc. | Total Bond Market Index Institutional Fund | \*\* | 40040383 |
|  | Vanguard Group, Inc. | Treasury Money Market Fund Investor Shares | \*\* | 49195 |
|  | American Funds | EUPAC Fund | \*\* | 20929338 |
|  | American Funds | The New Economy Fund | \*\* | 31628080 |
|  | J.P. Morgan | JPMorgan Large Cap Growth Fund | \*\* | 84374560 |
| \* | T. Rowe Price Trust Company | Retirement 2005 Fund I Class | \*\* | 119562 |
| \* | T. Rowe Price Trust Company | Retirement 2010 Fund I Class | \*\* | 304675 |
| \* | T. Rowe Price Trust Company | Retirement 2015 Fund I Class | \*\* | 2718878 |
| \* | T. Rowe Price Trust Company | Retirement 2020 Fund I Class | \*\* | 13404246 |
| \* | T. Rowe Price Trust Company | Retirement 2025 Fund I Class | \*\* | 22014783 |
| \* | T. Rowe Price Trust Company | Retirement 2030 Fund I Class | \*\* | 37640555 |
| \* | T. Rowe Price Trust Company | Retirement 2035 Fund I Class | \*\* | 49117582 |
| \* | T. Rowe Price Trust Company | Retirement 2040 Fund I Class | \*\* | 41235699 |
| \* | T. Rowe Price Trust Company | Retirement 2045 Fund I Class | \*\* | 59875227 |
| \* | T. Rowe Price Trust Company | Retirement 2050 Fund I Class | \*\* | 62754967 |
| \* | T. Rowe Price Trust Company | Retirement 2055 Fund I Class | \*\* | 58429501 |
| \* | T. Rowe Price Trust Company | Retirement 2060 Fund I Class | \*\* | 33134816 |
| \* | T. Rowe Price Trust Company | Retirement 2065 Fund I Class | \*\* | 13199702 |
| \* | T. Rowe Price Trust Company | Retirement Balanced Fund I Class | \*\* | 986009 |
| \* | Participant notes receivable | Interest rates from 5.25% to 10.50%, various maturities up to 15 years |  | 20498881 |
|  |  |  |  | $1279086976 |
| \* | Indicates party-in-interest to the Plan | Indicates party-in-interest to the Plan | Indicates party-in-interest to the Plan | Indicates party-in-interest to the Plan |
| \*\* | Cost information in column (d) is not required for participant-directed investments | Cost information in column (d) is not required for participant-directed investments | Cost information in column (d) is not required for participant-directed investments | Cost information in column (d) is not required for participant-directed investments |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the Qualified Retirement Plans and Trusts Committee, the Trustee of the Atmos Energy Corporation Retirement Savings Plan and Trust, as amended, has duly caused this annual report to be signed on its behalf by the undersigned, hereunto duly authorized.

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| | |
|:---|:---|
| ATMOS ENERGY CORPORATION<br>RETIREMENT SAVINGS PLAN AND TRUST | ATMOS ENERGY CORPORATION<br>RETIREMENT SAVINGS PLAN AND TRUST |
| By: | /s/ CHRISTOPHER T. FORSYTHE |
|  | Christopher T. Forsythe |
|  | Chairman of the Qualified<br>Retirement Plans and<br>Trusts Committee |

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June 25, 2026

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**EXHIBITS INDEX**

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| | | |
|:---|:---|:---|
| **<u>Exhibit Number</u>** | **<u>Description</u>** | **<u>Page Number or Incorporation by Reference to</u>** |
| 23.1 | <u>[Consent of Independent Registered Public Accounting Firm, Whitley Penn LLP](ato123125ex-231.htm)</u> | |

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## Exhibit 23.1

**Exhibit 23.1**

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We consent to the incorporation by reference in Registration Statement Numbers 33-57687, 333-63738, 333-116367, 333-138209, 333-155570, 333-166639, 333-199301, and 333-217739 on Form S-8 and related prospectuses of Atmos Energy Corporation of our report dated June 25, 2026, with respect to the statements of net assets available for benefits of the Atmos Energy Corporation Retirement Savings Plan and Trust as of December 31, 2025 and 2024, the related statement of changes in net assets available for benefits for the year ended December 31, 2025, and the related supplemental schedule of Form 5500, Schedule H, line 4i - Schedule of Assets (Held at End of Year) as of December 31, 2025, which report appears in the December 31, 2025, annual report on Form 11-K of the Atmos Energy Corporation Retirement Savings Plan and Trust for the year ended December 31, 2025.

/s/ Whitley Penn LLP

Dallas, Texas

June 25, 2026

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