Director Alexander Dimitrief boosts Eos Energy (EOSE) stake with 15,000-share buy

Rhea-AI Filing Summary

Eos Energy Enterprises director Alexander Dimitrief bought additional shares of the company’s common stock in the open market. On March 2, 2026, he purchased 15,000 shares at a price of $6.04 per share, increasing his direct holdings to 235,221 shares.

The filing also notes an additional 10,000 shares of common stock held indirectly by his spouse, reported as indirect ownership. This Form 4 highlights continued equity ownership by a board member through a meaningful open-market purchase.

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

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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^*

DIMITRIEF ALEXANDER

(Last) (First) (Middle)

C/O EOS ENERGY ENTERPRISES, INC.

3920 PARK AVENUE

(Street)

EDISON NJ 08820

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Eos Energy Enterprises, Inc. [ EOSE ]

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)
03/02/2026

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	03/02/2026		P		15,000	A	$6.04	235,221	D
Common Stock								10,000	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:

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Alexander Dimitrief	03/04/2026
	** 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 EOSE director Alexander Dimitrief report?

Alexander Dimitrief reported buying 15,000 shares of Eos Energy Enterprises common stock. The open-market purchase occurred on March 2, 2026 at $6.04 per share, increasing his direct holdings to 235,221 shares and signaling a larger personal stake in the company.

At what price did Alexander Dimitrief buy Eos Energy (EOSE) shares?

He purchased Eos Energy Enterprises common stock at $6.04 per share. The March 2, 2026 open-market transaction covered 15,000 shares, representing a cash outlay of roughly $90,600 and raised his directly owned stake to 235,221 shares according to the Form 4.

How many EOSE shares does Alexander Dimitrief own after this Form 4?

After the reported transaction, he directly owns 235,221 Eos Energy Enterprises shares. The Form 4 also discloses an additional 10,000 shares held indirectly by his spouse, indicating both direct and indirect economic exposure to the company’s common stock.

What indirect EOSE share ownership is reported for Alexander Dimitrief?

The filing shows 10,000 Eos Energy Enterprises shares held indirectly by his spouse. This stake is reported separately from his 235,221 directly owned shares, reflecting additional family exposure to the company’s common stock beyond his own open-market purchase.

Was the Eos Energy (EOSE) insider trade a buy or sell?

The reported insider trade was a buy. Director Alexander Dimitrief executed an open-market purchase of 15,000 Eos Energy Enterprises common shares on March 2, 2026, at $6.04 per share, increasing his overall reported ownership position in the company.