Eos Energy (NASDAQ: EOSE) CEO vests RSUs and withholds 60,703 shares for taxes

Filing Impact

(High)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Eos Energy Enterprises Chief Executive Officer Joe Mastrangelo reported routine equity compensation activity involving restricted stock units (RSUs). On June 26, 2026, he exercised RSUs to acquire 130,570 shares of common stock at a conversion price of $0.00 per share under the company’s 2020 Incentive Plan.

In connection with this vesting, on June 30, 2026 the company withheld 60,703 common shares at a value of $6.09 per share to cover tax obligations, which is recorded as a disposition but not an open-market sale. After these transactions, Mastrangelo directly holds 1,640,347 shares of common stock and 261,140 RSUs, with each RSU representing a contingent right to receive one share of common stock.

Insider Trade Summary

130,570 shares exercised/converted

Mixed 3 txns

Insider Mastrangelo Joe

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	60,703	$6.09	$370K
Exercise	Restricted Stock Units	130,570	$0.00	--
Exercise	Common Stock	130,570	$0.00	--

Holdings After Transaction: Common Stock — 1,640,347 shares (Direct, null); Restricted Stock Units — 261,140 shares (Direct, null)

Footnotes (1)

Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock. Represents shares withheld from vested restricted stock unit ("RSU") award to satisfy tax obligations, as permitted by the Company's Amended and Restated 2020 Incentive Plan. 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 exercised: 130,570 shares Tax-withholding shares: 60,703 shares Tax-withholding price: $6.09 per share +3 more

6 metrics

RSUs exercised 130,570 shares Common stock from RSU conversion on June 26, 2026

Tax-withholding shares 60,703 shares Shares withheld to satisfy tax obligations on June 30, 2026

Tax-withholding price $6.09 per share Value used for 60,703-share tax-withholding disposition

Common shares after transactions 1,640,347 shares Total direct common stock holdings following reported transactions

RSUs outstanding 261,140 RSUs Restricted stock units remaining after the RSU exercise

Exercise price for RSUs $0.00 per share Conversion or exercise price for 130,570 RSUs into common stock

Key Terms

Restricted Stock Units, RSU, tax obligations, 2020 Incentive Plan, +2 more

6 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.

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.

tax obligations financial

"Represents shares withheld from vested restricted stock unit ("RSU") award to satisfy tax obligations"

2020 Incentive Plan financial

"under the Issuer's 2020 Incentive Plan, which will vest in three equal installments"

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition" for 60,703 common shares"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion" for 130,570 RSUs into common stock"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/30/2026 - 05:05 PM Accepted by SEC EDGAR 06/30/2026 - 05:05 PM

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^*

Mastrangelo Joe

(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
X	Officer (give title below)	Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/26/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/26/2026		M		130,570	A	$0⁽¹⁾	1,701,050	D
Common Stock	06/30/2026		F		60,703⁽²⁾	D	$6.09	1,640,347	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units⁽³⁾	⁽¹⁾	06/26/2026		M			130,570	⁽⁴⁾	⁽⁴⁾	Common Stock	130,570	$0	261,140	D

Explanation of Responses:

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

2. Represents shares withheld from vested restricted stock unit ("RSU") award to satisfy tax obligations, as permitted by the Company's Amended and Restated 2020 Incentive Plan.

3. 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.

4. Not applicable.

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Joe Mastrangelo	06/30/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did EOSE CEO Joe Mastrangelo report on this Form 4?

Joe Mastrangelo reported RSU-related transactions, exercising 130,570 restricted stock units into common stock and a separate tax-withholding disposition of 60,703 shares. These events reflect routine equity compensation activity rather than open-market buying or selling of Eos Energy Enterprises (EOSE) shares.

Did the EOSE CEO buy or sell shares on the open market in this Form 4?

The filing does not show open-market trades. It reports RSU vesting and shares withheld for taxes. The 60,703-share disposition at $6.09 per share was used to satisfy tax obligations, not an open-market sale initiated for portfolio or timing reasons.

How many EOSE shares did Joe Mastrangelo acquire through RSU vesting?

Joe Mastrangelo acquired 130,570 shares of Eos Energy Enterprises common stock through RSU vesting at a conversion price of $0.00 per share. Each vested restricted stock unit converts into one share of common stock under the company’s 2020 Incentive Plan terms.

How many EOSE shares were withheld for taxes in the CEO’s Form 4?

The company withheld 60,703 shares of Eos Energy Enterprises common stock at $6.09 per share to cover tax obligations tied to RSU vesting. This tax-withholding disposition is a standard mechanism and is treated differently from discretionary open-market stock sales.

What are Joe Mastrangelo’s EOSE holdings after these Form 4 transactions?

Following these transactions, Joe Mastrangelo directly holds 1,640,347 shares of Eos Energy Enterprises common stock and 261,140 restricted stock units. Each RSU represents a contingent right to receive one share of common stock, subject to continued service and vesting conditions.

How do the EOSE CEO’s RSUs vest according to this disclosure?

The RSUs granted under Eos Energy Enterprises’ 2020 Incentive Plan vest in three equal installments on each of the first three anniversaries of the grant date. Vesting is subject to the CEO’s continued service with the company through each applicable vesting date.