[Form 4] Gevo, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Gary W. Mize, a director of Gevo, Inc. (GEVO), executed equity transactions on 08/18/2025. He exercised stock options to acquire 224,639 shares at an exercise price of $0.67 per share, increasing his direct holdings to 479,785 shares before a subsequent sale. On the same date he sold 91,459 shares in multiple transactions at a weighted-average price of $1.6757 per share (individual sale prices ranged from $1.67 to $1.76). After the sale his direct beneficial ownership was reported as 388,326 shares. The Form 4 was signed by an attorney-in-fact on 08/19/2025. The filing discloses the option exercise date, exercise price, number of shares acquired, number sold, and the weighted-average sale price range.

Positive

• Director exercised 224,639 stock options at a $0.67 exercise price on 08/18/2025, increasing direct ownership to 479,785 shares before sales
• Timely and complete Form 4 disclosure includes transaction dates, prices, amounts, post-transaction ownership and a footnote on sale price range

Negative

• Director sold 91,459 shares on 08/18/2025 at a weighted-average price of $1.6757, reducing direct holdings to 388,326 shares
• Potential dilution from option exercise of 224,639 shares (exercise price $0.67) which increases share count outstanding

Insights

Securities Analyst

TL;DR: Director exercised options for a large block of shares and sold a smaller portion the same day, showing net share increase.

The reporting shows an option exercise of 224,639 shares at $0.67, immediately followed by open-market sales of 91,459 shares at a weighted-average $1.6757. Net result is an increase of 113,180 shares in direct beneficial ownership versus pre-transaction holdings implied by the filing. For investors, director option exercises at below-market exercise prices can be dilutive but also signal alignment of insiders with equity ownership; simultaneous partial sales are common for tax or liquidity reasons. All figures are explicitly disclosed in the Form 4.

Corporate Governance Expert

TL;DR: Transactions were properly reported on Form 4 and include attorney-in-fact signature, meeting disclosure requirements.

The filing identifies the reporting person as a director and shows timely reporting of both an exercise and subsequent sales on 08/18/2025, with a clear footnote on the weighted-average sale price range. The Form 4 indicates individual reporting rather than joint filing and includes the required signature by attorney-in-fact. From a governance perspective, the disclosure is complete regarding quantities, prices, and ownership after transactions.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mize Gary W.

(Last) (First) (Middle)

C/O GEVO, INC. 345 INVERNESS DRIVE SOUTH

BUILDING C, SUITE 310

(Street)

ENGLEWOOD CO 80112

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Gevo, Inc. [ GEVO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Common Stock	08/18/2025		M		224,639	A	$0.67	479,785	D
Common Stock	08/18/2025		S		91,459	D	$1.6757(1)	388,326	D

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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	$0.67	08/18/2025		M			224,639	05/23/2025	05/22/2034	Common Stock	224,639	$0	0	D

Explanation of Responses:

1. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.67 to $1.76 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

	/s/ E. Cabell Massey, Attorney-in-Fact	08/19/2025
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transactions did GEVO director Gary W. Mize report on Form 4?

The Form 4 reports an option exercise of 224,639 shares at $0.67 and the sale of 91,459 shares on 08/18/2025.

How many GEVO shares does Gary W. Mize beneficially own after these transactions?

After the transactions the filing reports 388,326 shares of direct beneficial ownership.

What was the sale price for the shares sold by the director?

The shares were sold at a weighted-average price of $1.6757 per share, with individual prices ranging from $1.67 to $1.76.

When were these transactions executed and who signed the Form 4?

Transactions occurred on 08/18/2025 and the Form 4 was signed by E. Cabell Massey, Attorney-in-Fact on 08/19/2025.

Was the reporting person a director or officer of GEVO?

The filing identifies Gary W. Mize as a Director of Gevo, Inc.