Sec Form 4 Filing - Heagen Carson E. @ Expion360 Inc. - 2025-07-31

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Heagen Carson E. 2. Issuer Name and Ticker or Trading Symbol Expion360 Inc. [ XPON] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Operating Officer (Last) (First) (Middle) 2025 SW DEERHOUND AVE 3. Date of Earliest Transaction (MM/DD/YY) 07/31/2025 (Street) REDMOND, OR97756 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 0.769 ( 1 ) 07/31/2025 A 32,966 ( 2 ) 07/31/2025 07/31/2035 Common Stock 32,966 $ 0 32,966 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Heagen Carson E. 2025 SW DEERHOUND AVE REDMOND, OR97756 Chief Operating Officer Signatures /s/ Brian Schaffner, Attorney-in-Fact for Carson E. Heagen 08/01/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The exercise price of the Options (as defined below) was determined based on the closing price of the Issuer's common stock, par value $0.001 per share, on the date the Options were conditionally approved by the compensation committee of the board of directors. ( 2 )Reflects a grant of stock options (the "Options") made to the Reporting Person under the Issuer's 2021 Incentive Award Plan (the "Plan"). The Options were approved by the compensation committee of the board of directors on April 9, 2025, subject to stockholder approval of an increase in the number of shares available for issuance under the Plan under which the Options were granted (the "Plan Amendment"). The Plan Amendment was approved by stockholders on July 31, 2025. The Options vested in full and became immediately exercisable on July 31, 2025.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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