Acorn Energy (ACFN) director exercises 625 options, reports over 178k shares

Rhea-AI Filing Summary

Acorn Energy director Michael Osterer reported an option exercise and related share holdings. On February 5, 2026, he exercised 625 stock options with a conversion price of $4.96 per share, acquiring 625 shares of common stock at $4.96 each.

Following this transaction, he held 126,211 shares of Acorn Energy common stock directly. The filing also reports 52,083 shares of common stock held indirectly by UE Systems Inc., over which Mr. Osterer shares voting and dispositive power.

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

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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^*

Osterer Michael

(Last) (First) (Middle)

C/O ACORN ENERGY, INC.

1000 N WEST ST, SUITE 1200

(Street)

WILMINGTON DE 19801

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ACORN ENERGY, INC. [ ACFN ]

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)
02/05/2026

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	02/05/2026		M		625	A	$4.96	126,211	D
common stock								52,083	I	by UE Systems Inc.(1)

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 options(2)	$4.96	02/05/2026		M			625	(3)	02/05/2026	common stock	625	$0	0	D

Explanation of Responses:

1. Mr. Osterer shares voting and dispositive power over such securities.

2. Granted on 2/5/19 pursuant to the issuer's Amended and Restated 2006 Stock Incentive Plan in connection with the reporting person's service on the Board of Directors.

3. One-fourth of the options vested and became exercisable on each of 2/5/19, 4/1/19, 7/1/19 and 10/1/19.

	/s/ Michael Osterer	02/06/2026
	** 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.

FAQ

What insider transaction did Michael Osterer report for Acorn Energy (ACFN)?

Michael Osterer reported exercising 625 stock options for Acorn Energy on February 5, 2026. The options converted into 625 shares of common stock at $4.96 per share, increasing his directly held stake while eliminating those derivative securities.

How many Acorn Energy (ACFN) shares does Michael Osterer own after this Form 4?

After the reported transaction, Michael Osterer directly owns 126,211 Acorn Energy common shares. The filing also lists 52,083 additional shares held indirectly by UE Systems Inc., over which he shares voting and dispositive power according to the footnotes.

What were the terms of the Acorn Energy (ACFN) stock options exercised by Michael Osterer?

The exercised stock options covered 625 shares of Acorn Energy common stock at a conversion or exercise price of $4.96 per share. These options were originally granted on February 5, 2019 under the company’s Amended and Restated 2006 Stock Incentive Plan.

When did Michael Osterer’s Acorn Energy (ACFN) options vest and become exercisable?

According to the filing, one-fourth of the options vested and became exercisable on each of February 5, 2019, April 1, 2019, July 1, 2019 and October 1, 2019. These vesting dates applied to the options granted for his Board of Directors service.

What indirect Acorn Energy (ACFN) holdings are associated with Michael Osterer?

The Form 4 reports 52,083 Acorn Energy common shares held indirectly by UE Systems Inc. A footnote states Mr. Osterer shares voting and dispositive power over these securities, indicating a form of shared beneficial ownership through that related entity.