Eos Energy Enterprises (EOSE) CFO granted 277,773 restricted stock units

Rhea-AI Filing Summary

Lagi Alessandro reported acquisition or exercise transactions in this Form 4 filing.

Eos Energy Enterprises, Inc. reported that Chief Financial Officer Alessandro Lagi received a grant of 277,773 Restricted Stock Units (RSUs). Each RSU represents a contingent right to receive one share of common stock. Following this grant, he holds 277,773 RSUs directly.

The RSUs were granted under the company’s 2020 Incentive Plan and will vest in three equal installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date. This is a compensation-related award, not an open-market purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Lagi Alessandro

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	277,773	$0.00	--

Holdings After Transaction: Restricted Stock Units — 277,773 shares (Direct, null)

Footnotes (1)

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock. The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three equal installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date. Not applicable.

Key Figures

RSUs granted: 277,773 units RSUs held after grant: 277,773 units Vesting installments: 3 equal tranches +1 more

4 metrics

RSUs granted 277,773 units Restricted Stock Units granted to CFO on June 8, 2026

RSUs held after grant 277,773 units Total Restricted Stock Units directly held following this award

Vesting installments 3 equal tranches Vesting on each of the first three anniversaries of the grant date

RSU-to-share ratio 1 RSU : 1 share Each RSU represents a right to receive one common share upon vesting

Key Terms

Restricted Stock Units, 2020 Incentive Plan, vesting, contingent right

4 terms

Restricted Stock Units financial

"The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan"

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.

2020 Incentive Plan financial

"The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan"

vesting financial

"which will vest in three equal installments on each of the first three anniversaries"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

contingent right financial

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

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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^*

Lagi Alessandro

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/08/2026

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)	06/08/2026		A		277,773		(2)	(3)	Common Stock	277,773	$0	277,773	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 received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three equal installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date.

3. Not applicable.

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Alessandro Lagi	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)

FAQ

What did EOSE CFO Alessandro Lagi receive in this Form 4 filing?

Eos Energy Enterprises CFO Alessandro Lagi received 277,773 Restricted Stock Units as a compensation award. These RSUs give him the right to receive an equal number of common shares if and when they vest over time.

Is the EOSE Form 4 transaction a stock purchase or sale by the CFO?

The Form 4 reports a grant of Restricted Stock Units to the CFO, not an open-market stock purchase or sale. It is a compensation-related award granted at no cash cost to him under the company’s 2020 Incentive Plan.

How many EOSE RSUs does the CFO hold after this grant?

After this grant, the CFO holds 277,773 Restricted Stock Units. Each RSU represents a contingent right to receive one share of Eos Energy Enterprises common stock if vesting conditions tied to continued service are satisfied.

What is the vesting schedule for the 277,773 EOSE RSUs granted?

The 277,773 RSUs will vest in three equal installments on each of the first three anniversaries of the grant date. Vesting is contingent on the CFO’s continued service with Eos Energy Enterprises through each applicable vesting date.

What does each EOSE Restricted Stock Unit represent for the CFO?

Each Restricted Stock Unit represents a contingent right to receive one share of Eos Energy Enterprises common stock. The CFO only receives the underlying shares if the RSUs vest according to the specified three-year service-based vesting schedule.

Under which plan were the EOSE RSUs granted to the CFO?

The RSUs were granted under Eos Energy Enterprises’ 2020 Incentive Plan. This plan is used to issue equity-based compensation, such as Restricted Stock Units, aligning executive incentives with the company’s long-term stock performance and retention goals.