Eos Energy director awarded 21,253 RSUs

Walters Marian reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Walters Marian reported acquisition or exercise transactions in this Form 4 filing.

Eos Energy Enterprises director Marian Walters received a grant of 21,253 restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of common stock. The RSUs vest on the earlier of the first anniversary of the June 5, 2026 grant date or immediately before the company’s next annual shareholders meeting.

Insider Trade Summary

Grant/Award: 21,253 shares

Grant/Award 1 txn

Insider Walters Marian

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	21,253	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 21,253 contracts (Direct)

Footnotes (3)

1. F1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.
2. F2. The reporting person was granted RSUs that settle in common stock, which will vest on the earlier of (i) the first anniversary of the grant date and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date.
3. F3. Not applicable.

Key Figures

RSU grant size: 21,253 RSUs Post-grant RSU holdings: 21,253 RSUs RSU share ratio: 1 share per RSU

3 metrics

RSU grant size 21,253 RSUs Granted to director Marian Walters on June 5, 2026

Post-grant RSU holdings 21,253 RSUs Total RSUs reported as beneficially owned after the grant

RSU share ratio 1 share per RSU Each RSU represents one share of common stock

Key Terms

Restricted Stock Units, RSU, vest, annual shareholders meeting

4 terms

Restricted Stock Units financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one share"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSU financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one share"

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

vest financial

"which will vest on the earlier of (i) the first anniversary of the grant date"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

annual shareholders meeting financial

"immediately prior to the date of the next annual shareholders meeting of the Company"

An annual shareholders meeting is a yearly gathering where owners of a company review its performance, hear presentations from management, ask questions, and vote on important items such as board members, executive pay, and dividend policies. Think of it as a company town hall where votes and discussions can change leadership, strategy or payouts—outcomes that can directly affect a stock’s future performance and an investor’s rights and returns.

FAQ

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

What insider transaction did EOSE disclose for Marian Walters?

Eos Energy Enterprises disclosed that director Marian Walters received a grant of 21,253 restricted stock units. These RSUs are a form of equity compensation that convert into shares of common stock once vesting conditions are satisfied, aligning director interests with shareholders.

How many RSUs did Marian Walters receive from Eos Energy (EOSE)?

Marian Walters received 21,253 restricted stock units from Eos Energy Enterprises. Each RSU represents a right to one share of common stock, providing equity-based compensation that depends on continued service until the specified vesting date conditions are met.

When do Marian Walters’ EOSE RSUs vest?

The RSUs granted to Marian Walters vest on the earlier of the first anniversary of the June 5, 2026 grant date or immediately prior to the company’s next annual shareholders meeting, tying vesting to either time-based service or the upcoming shareholder meeting schedule.

What does each EOSE restricted stock unit granted to Marian Walters represent?

Each restricted stock unit granted to Marian Walters represents a contingent right to receive one share of Eos Energy common stock. The units have no cash exercise price and only convert into shares once the specified vesting conditions in the award agreement are met.

Is Marian Walters’ RSU grant an open-market purchase of EOSE shares?

No, the RSU grant to Marian Walters is not an open-market purchase. It is a compensation-related award reported with transaction code A, meaning she acquired the right to receive shares at no cost, subject to vesting rather than buying shares in the market.

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

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Accepted by SEC EDGAR 06/09/2026 - 04:23 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^*

Walters Marian

(Last) (First) (Middle)

C/O EOS ENERGY ENTERPRISES, INC.

3920 PARK AVENUE

(Street)

EDISON NEW JERSEY 08820

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/05/2026

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

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
Restricted Stock Units	(1)	06/05/2026		A		21,253		(2)	(3)	Common Stock	21,253	$0	21,253	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.

2. The reporting person was granted RSUs that settle in common stock, which will vest on the earlier of (i) the first anniversary of the grant date and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date.

3. Not applicable.

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Marian Walters	06/09/2026
	** 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)