Alto Ingredients director buys 10,000 shares

Alto Ingredients director Nathan E. Gilbert bought 10,000 ALTO shares, bringing direct holdings to 866,393 and reporting an additional 31,200 shares held by his spouse.

Available on EDGAR 09/14/2026 - 04:45 PM EDT Accepted by SEC EDGAR 09/14/2026 - 04:39 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Alto Ingredients, Inc. (ALTO) director Nathan E. Gilbert reported buying 10,000 shares of common stock on September 14, 2026 in a purchase described as taking place in the open market or a private transaction at about $3.93 per share. Following this purchase, he holds 866,393 shares directly and reports 31,200 shares held indirectly by his spouse. No Rule 10b5-1 trading plan is reported for these transactions.

Insider Trade Summary

Net Buyer: 10,000 shares

Net Buy 1 txn

Insider NATHAN GILBERT E

Role Director

Bought 10,000 shs ($39K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	10,000	$3.9299	$39K
Holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 866,393 shares (Direct); Common Stock — 31,200 shares (Indirect, by spouse)

Key Figures

Shares purchased: 10,000 shares Purchase price per share: $3.93 per share Direct holdings after transaction: 866,393 shares +2 more

5 metrics

Shares purchased 10,000 shares Common stock bought by the director on September 14, 2026

Purchase price per share $3.93 per share Approximate price for the 10,000-share purchase on September 14, 2026

Direct holdings after transaction 866,393 shares Director’s direct Alto Ingredients common stock position after the purchase

Indirect holdings by spouse 31,200 shares Common stock reported as held indirectly through the director’s spouse

Net shares bought 10,000 shares Net change in reported buy and sell activity for this Form 4

Key Terms

open market, indirect ownership, Rule 10b5-1

3 terms

open market market

"a purchase in the open market or a private transaction"

An open market is a system where buying and selling of goods, services, or financial assets happen freely without restrictions or special controls. For investors, it means they can trade assets easily and quickly, which helps determine fair prices based on supply and demand. This environment encourages transparency and competition, making it easier to buy or sell with confidence.

indirect ownership financial

"shares held by a spouse are reported as indirect ownership"

Rule 10b5-1 regulatory

"no transactions under a Rule 10b5-1 trading plan are reported"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Alto Ingredients (ALTO) director Nathan E. Gilbert report in this Form 4?

He reported a purchase of 10,000 shares of Alto Ingredients common stock on September 14, 2026, in a transaction described as occurring in the open market or a private transaction, and updated his direct and indirect share holdings.

How many Alto Ingredients (ALTO) shares did the director buy and at what price?

Nathan E. Gilbert bought 10,000 shares of Alto Ingredients common stock at about $3.93 per share on September 14, 2026, according to the reported per-share transaction price.

What are Nathan E. Gilbert’s total direct holdings in ALTO after this transaction?

After the reported purchase, Nathan E. Gilbert directly holds 866,393 shares of Alto Ingredients common stock, as stated in the post-transaction ownership figure.

Does the Form 4 show any indirect ownership of Alto Ingredients (ALTO) shares?

Yes. The filing reports 31,200 shares of Alto Ingredients common stock held indirectly by his spouse, separate from his direct ownership position.

Was the Alto Ingredients (ALTO) director’s trade under a Rule 10b5-1 plan?

No. The report indicates that no Rule 10b5-1 trading plan applies to the reported transactions, meaning they are not identified as pre-arranged plan trades in this filing.

Is this Alto Ingredients (ALTO) Form 4 mainly a buy or sell filing?

It is mainly a buy filing. The report shows a net purchase of 10,000 shares of Alto Ingredients common stock and does not list any share sales for the same date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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
Estimated average burden
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^*

NATHAN GILBERT E

(Last) (First) (Middle)

1300 SOUTH SECOND STREET

(Street)

PEKIN ILLINOIS 61554

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Alto Ingredients, Inc. [ ALTO ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026

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

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

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

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	09/14/2026		P		10,000	A	$3.9299	866,393	D
Common Stock								31,200	I	by spouse

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

Explanation of Responses:

	/s/ Gilbert E. Nathan	09/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)