Eos Energy (EOSE) director converts 3,565 RSUs into common stock, holding 38,950 shares

Rhea-AI Filing Summary

Eos Energy Enterprises director Joseph Nigro exercised restricted stock units into common shares. He converted 3,565 restricted stock units, each representing the right to receive one share of common stock, into 3,565 shares of common stock at a stated price of $0.00 per share. No shares were sold in this filing, and his directly held common stock position increased to 38,950 shares following the transaction. The exercised restricted stock unit award now shows zero derivative units remaining.

Insights

Equity compensation analyst

Routine RSU vesting increases director’s share holdings without any share sales.

The filing shows Joseph Nigro exercising 3,565 restricted stock units into the same number of Eos Energy Enterprises common shares at a stated price of $0.00 per share. This is a standard equity compensation event rather than an open‑market purchase.

No sales or tax-withholding dispositions are reported, and the derivative balance from this RSU grant is now zero. Following the transaction, Nigro directly holds 38,950 common shares, indicating a modest increase in his equity exposure while keeping the transaction economically routine.

Insider Trade Summary

3,565 shares exercised/converted

Mixed 2 txns

Insider Nigro Joseph

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	3,565	$0.00	--
Exercise	Common Stock	3,565	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 38,950 shares (Direct, null)

Footnotes (1)

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock. Not applicable.

Key Figures

RSUs exercised: 3,565 units Common shares acquired: 3,565 shares Exercise price: $0.00 per share +3 more

6 metrics

RSUs exercised 3,565 units Restricted stock units converted to common stock

Common shares acquired 3,565 shares Shares received from RSU exercise

Exercise price $0.00 per share Stated transaction price for RSU conversion

Shares held after transaction 38,950 shares Director’s direct common stock holdings after exercise

Derivative RSUs remaining 0 units RSUs from this award after exercise

Exercise transactions 1 non-derivative, 1 derivative Linked RSU and common stock records on Form 4

Key Terms

Restricted Stock Units, derivative security, contingent right, Form 4

4 terms

Restricted Stock Units financial

"The filing reports a transaction in "Restricted Stock Units" as a derivative security."

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.

derivative security financial

"Transaction code M is described as an exercise or conversion of a derivative security."

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

contingent right financial

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

Form 4 regulatory

"INSIDER FILING DATA (Form 4) summarizes Joseph Nigro’s equity transactions."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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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^*

Nigro Joseph

(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)
06/02/2026

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	06/02/2026		M		3,565	A	$0(1)	38,950	D

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)	06/02/2026		M			3,565	(2)	(2)	Common Stock	3,565	$0	0	D

Explanation of Responses:

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

2. Not applicable.

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Joseph Nigro	06/03/2026
	** 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 director Joseph Nigro do in this Form 4 filing?

Joseph Nigro exercised 3,565 restricted stock units into 3,565 shares of Eos Energy common stock. This derivative exercise converted previously granted equity awards into actual shares and reflects a routine compensation-related transaction rather than an open-market stock purchase or sale.

How many EOSE shares does Joseph Nigro hold after this transaction?

After exercising the restricted stock units, Joseph Nigro directly holds 38,950 shares of Eos Energy common stock. This total reflects his updated ownership position following the conversion of 3,565 restricted stock units into common shares reported in the Form 4 filing.

Were any EOSE shares sold in Joseph Nigro’s latest Form 4?

No shares were sold in this Form 4. The filing only reports the exercise of 3,565 restricted stock units into common stock at a stated price of $0.00 per share, with no open-market sale or tax-withholding disposition transactions disclosed.

What is the significance of the 3,565 restricted stock units in the EOSE Form 4?

The 3,565 restricted stock units represented a contingent right to receive one share of Eos Energy common stock each. Their exercise converted them into 3,565 actual shares, increasing Joseph Nigro’s direct common stock holdings while reducing the RSU balance from this grant to zero.

Does the EOSE Form 4 indicate any remaining derivative securities for Joseph Nigro?

The derivative position related to this restricted stock unit award is now zero after exercising 3,565 units. The filing’s derivative summary shows no remaining derivative securities from this transaction, indicating the RSUs in question have been fully converted into common shares.