Joseph D. Hammer - 21 Aug 2026 Form 4 Insider Report for Expion Energy, Inc. (XPON)

Reporting relationship: Former Chief Executive Officer, Director
Issuer ticker: XPON
Reported as of: 21 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 25 Aug 2026, 21:12:58 UTC
Prior SEC filing: 18 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Shawna Bowin, Attorney-in-Fact for Joseph D. Hammer

Key filing fact

Joseph D. Hammer filed Form 4 for Expion Energy, Inc. (XPON) on 25 Aug 2026.

Key facts

This page summarizes Joseph D. Hammer's Form 4 filing for Expion Energy, Inc. (XPON).
2 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 25 Aug 2026, 21:12.

Change

Previous filing in this sequence was filed on 18 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001576484 Primary reporting owner

Hammer Joseph D

Relationship: Former Chief Executive Officer, Director
Address: C/O EXPION ENERGY, INC., 2025 SW DEERHOUND AVE, REDMOND
Signature: /s/ Shawna Bowin, Attorney-in-Fact for Joseph D. Hammer
Signature date: 25 Aug 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

XPON transaction Derivative

8% Convertible Debenture Due August 21, 2029

Purchase

Transaction value
Shares: +4,500
Change %
Price: $4500000.00^*
Shares after: 4,500
Date: 21 Aug 2026
Ownership: See footnote
Underlying class: Series A-1 8% Convertible Preferred Stock
Underlying amount: 4,500
Exercise price: $1000.00
Footnotes: F1, F2, F3, F4

XPON transaction Derivative

Common Stock Purchase Warrant

Purchase

Transaction value
Shares: +1,058,609
Change %
Price: $0.000000^*
Shares after: 1,058,609
Date: 21 Aug 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 1,058,609
Exercise price: $4.25
Footnotes: F1, F4, F5, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

The Reporting Person served as the Chief Executive Officer of Expion Energy, Inc. (the "Company") through the Transaction Date, and continues to serve as the Chairman of the Board of Directors of the Company.

Footnote F2

Subject to the Company receiving shareholder approval and filing the Certificate of Designation, the 8% Convertible Debenture Due August 21, 2029 (the "Convertible Debenture") will automatically convert into shares of the Company's Series A-1 8% Convertible Preferred Stock (the "Preferred Conversion Shares") based on a stated value of $1,000 per share, resulting in the issuance of up to 4,500 Preferred Conversion Shares. The Preferred Conversion Shares may subsequently be converted into 1,058,609 shares of the Company's common stock, par value $0.001 per share ("Common Stock"), based on an initial conversion price of $4.25 per share, subject to adjustment as set forth in the Certificate of Designation. The Convertible Debenture, as well as the Preferred Conversion Shares issuable upon conversion thereof, is subject to a beneficial ownership limitation of 9.99% of the outstanding shares of Common Stock.

Footnote F3

The maturity date of the Convertible Debenture is August 21, 2029.

Footnote F4

The Derivative Securities are held by Five Narrow Lane LP ("FNL"). The Reporting Person may be deemed to beneficially own the Derivative Securities for purposes of Rule 13d-3 under the Securities Exchange Act of 1934.

Footnote F5

The Common Stock Purchase Warrant (the "Warrant") is exercisable for an aggregate of up to 1,058,609 shares of Common Stock based on an initial exercise price of $4.25 per share, subject to adjustment as set forth in the Warrant. The Warrant is subject to a beneficial ownership limitation of 9.99% of the outstanding shares of Common Stock.

Footnote F6

The Warrant was immediately exercisable on the date of issuance and expires on the five year anniversary of the date of issuance.