Alto Ingredients director buys 50,000 ALTO shares

Alto Ingredients, Inc. director Nathan E. Gilbert purchased additional common stock.

Rhea-AI Filing Summary

Alto Ingredients, Inc. director Nathan E. Gilbert purchased additional common stock. On 2026-08-11, he bought 50,000 shares at a weighted average price of $4.15 per share, with individual trade prices ranging from $4.13 to $4.1599. Following this open-market purchase, he directly holds 856,393 common shares. In addition, there are 31,200 shares reported as held indirectly by spouse.

Insider Trade Summary

Net Buyer: 50,000 shares

Net Buy 2 txns

Insider NATHAN GILBERT E

Role Director

Bought 50,000 shs ($208K)

Type	Security	Shares	Price	Value
Purchase	Common Stock F1	50,000	$4.15	$208K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 856,393 shares (Direct); Common Stock — 31,200 shares (Indirect, by spouse)

Footnotes (1)

1. F1. The price reported is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $4.13 to $4.1599, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.

Key Figures

Shares purchased: 50,000 shares Weighted average purchase price: $4.15 per share Price range of trades: $4.13–$4.1599 per share +2 more

5 metrics

Shares purchased 50,000 shares Common stock purchase on 2026-08-11 coded P

Weighted average purchase price $4.15 per share Weighted average; individual trades from $4.13 to $4.1599

Price range of trades $4.13–$4.1599 per share Range of prices for the purchased 50,000 shares

Direct holdings after transaction 856,393 shares Common stock directly owned by Nathan E. Gilbert after purchase

Indirect holdings by spouse 31,200 shares Common stock reported as indirectly owned by spouse

Key Terms

weighted average price, open market or private transaction, indirect ownership, by spouse

4 terms

weighted average price financial

"The price reported is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"Purchase in open market or private transaction"

indirect ownership financial

"total_shares_following_transaction 31200.0000, direct_or_indirect I"

by spouse financial

"nature_of_ownership "by spouse" for indirect holding entry"

FAQ

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

What did Alto Ingredients (ALTO) director Nathan Gilbert buy in this Form 4?

Director Nathan E. Gilbert purchased 50,000 shares of Alto Ingredients common stock on 2026-08-11. The filing describes this as an open-market or private purchase transaction, increasing his reported ownership position.

At what price were the ALTO shares purchased in Nathan Gilbert’s Form 4?

The reported purchase price is a weighted average of $4.15 per share. A footnote states the 50,000 shares were bought in multiple trades at prices ranging from $4.13 to $4.1599 per share.

How many Alto Ingredients (ALTO) shares does Nathan Gilbert own after this transaction?

After the reported purchase, Nathan E. Gilbert directly holds 856,393 shares of Alto Ingredients common stock. The Form 4 also reports 31,200 shares held indirectly, classified as ownership by spouse.

Is the Form 4 purchase by Alto Ingredients (ALTO) director Nathan Gilbert a buy or sell?

The Form 4 reports a purchase transaction coded “P,” which indicates an open-market or private buy of 50,000 common shares. No share sales are reported in this filing.

Does the Alto Ingredients (ALTO) Form 4 mention a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as an affirmative plan. The footnote for the transaction discusses the weighted-average pricing range but does not reference any trading plan arrangement.

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

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Available on EDGAR 08/12/2026 - 06:17 PM EDT Accepted by SEC EDGAR 08/12/2026 - 06:17 PM EDT Learn about SEC filing dates

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)
08/11/2026

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	08/11/2026		P		50,000	A	$4.15(1)	856,393	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:

1. The price reported is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $4.13 to $4.1599, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.

	/s/ Gilbert E. Nathan	08/12/2026
	** 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)