Alto Ingredients (ALTO) director adds 25,000 shares in open-market buys

Rhea-AI Filing Summary

Alto Ingredients director Nathan E. Gilbert reported open-market purchases of the company’s common stock. On May 12, he bought 20,000 shares at $4.61 per share, followed by another purchase of 5,000 shares at $4.45 per share on May 13. After these transactions, Gilbert directly holds 774,741 shares of Alto Ingredients common stock. The filing also shows an additional 31,200 shares held indirectly, listed as owned "by spouse." A footnote explains that the reported price for the May 13 purchase is a weighted average of multiple trades executed between $4.4965 and $4.775 per share.

Insider Trade Summary

Net Buyer: 25,000 shares ($114,450)

Net Buy 3 txns

Insider NATHAN GILBERT E

Role null

Bought 25,000 shs ($114K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,000	$4.45	$22K
Purchase	Common Stock	20,000	$4.61	$92K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 774,741 shares (Direct, null); Common Stock — 31,200 shares (Indirect, by spouse)

Footnotes (1)

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Key Figures

Open-market buy 1: 20,000 shares at $4.61 Open-market buy 2: 5,000 shares at $4.45 Total net shares bought: 25,000 shares +3 more

6 metrics

Open-market buy 1 20,000 shares at $4.61 Common Stock purchase on May 12, 2026

Open-market buy 2 5,000 shares at $4.45 Common Stock purchase on May 13, 2026 (weighted average)

Total net shares bought 25,000 shares Net-buy across reported transactions

Direct holdings after trades 774,741 shares Common Stock directly owned after May 13, 2026

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

Price range for weighted average $4.4965–$4.775 Range of individual trades on May 13, 2026

Key Terms

open-market purchase, weighted average price, indirect, beneficial ownership

4 terms

open-market purchase financial

"transaction_action": "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

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.

indirect financial

""direct_or_indirect": "I", "nature_of_ownership": "by spouse""

beneficial ownership financial

"full information regarding the number of shares purchased at each separate price"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Form 4 Insider Transactions: What Each Field Means →

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)
05/12/2026

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	05/12/2026		P		20,000	A	$4.61(1)	769,741	D
Common Stock	05/13/2026		P		5,000	A	$4.45	774,741	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 $4.4965 to $4.775, 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	05/13/2026
	** 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)

FAQ

What insider transaction did Alto Ingredients (ALTO) director Nathan E. Gilbert report?

Director Nathan E. Gilbert reported buying Alto Ingredients common stock in the open market. He made two purchases totaling 25,000 shares, increasing his direct holdings while also disclosing additional shares held indirectly through his spouse as shown in the Form 4 filing.

How many Alto Ingredients (ALTO) shares did Nathan E. Gilbert buy and at what prices?

Nathan E. Gilbert bought 20,000 Alto Ingredients common shares at $4.61 on May 12 and 5,000 shares at $4.45 on May 13. The May 13 price is a weighted average of multiple trades between $4.4965 and $4.775 per share, according to the filing.

What are Nathan E. Gilbert’s Alto Ingredients (ALTO) holdings after these transactions?

Following the reported purchases, Nathan E. Gilbert directly holds 774,741 Alto Ingredients common shares. The Form 4 also reports 31,200 additional common shares held indirectly and described as owned "by spouse," reflecting an indirect beneficial ownership position alongside his direct holdings.

What does the weighted average price disclosure mean in the ALTO Form 4?

The Form 4 states the reported price for one transaction is a weighted average. This means the 5,000 shares on May 13 were bought in multiple trades between $4.4965 and $4.775, with $4.45 representing the average price calculated across all those individual executions.

Does the Alto Ingredients (ALTO) Form 4 include any derivative or option transactions?

The Form 4 shows only common stock transactions for Nathan E. Gilbert, specifically open-market purchases. The derivative section is empty, and the transaction summary lists no option exercises or other derivative trades, focusing solely on changes in common share ownership.