Eos Energy director exercises options, sells 7,681 shares

Eos Energy Enterprises director Marian Walters reported a mix of option exercises and share sales in common stock.

Rhea-AI Filing Summary

Eos Energy Enterprises director Marian Walters reported a mix of option exercises and share sales in common stock. Walters exercised restricted stock units and stock options covering a total of 30,792 shares, including 7,681 options at an exercise price of $1.18 per share, then sold 7,681 shares in an open-market transaction at a weighted average price of $7.07 per share, with trade prices ranging from $7.01 to $7.24. After these transactions, Walters holds 135,334 shares directly and 5,000 shares indirectly through the D. and M. Walters Family Trust.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 6 txns

Insider Walters Marian

Role Director

Sold 7,681 shs ($54K)

Approx. gross sale proceeds $54K

Approx. exercise cost $9K

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	23,111	$0.00	$0.00
Exercise	Stock Option (Right to Buy)	7,681	$0.00	$0.00
Exercise	Common Stock	7,681	$1.18	$9K
Sale	Common Stock	7,681	$7.07	$54K
Exercise	Common Stock	23,111	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Stock Option (Right to Buy) — 87,337 contracts (Direct); Common Stock — 158,445 shares (Direct); Common Stock — 5,000 shares (Indirect, See footnote)

Footnotes (5)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.01 to $7.24, inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
2. F2. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.
3. F3. Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020
4. F4. Not applicable.
5. F5. On May 19, 2022 the reporting person was granted stock options to purchase 145,018 shares of common stock which vested on May 19, 2023. 50,000 of these stock options were previously exercised on December 4, 2025.

Key Figures

Shares sold: 7,681 shares Sale price (weighted average): $7.07 per share Shares acquired via exercises: 30,792 shares +5 more

8 metrics

Shares sold 7,681 shares Open-market sale of common stock at weighted average price

Sale price (weighted average) $7.07 per share Common stock sale with trades from $7.01 to $7.24

Shares acquired via exercises 30,792 shares RSU and option exercises converting derivatives into common stock

Option exercise price $1.18 per share Stock options exercised for 7,681 underlying common shares

Direct common stock holdings 135,334 shares Shares owned directly after reported transactions

Indirect trust holdings 5,000 shares Held by D. and M. Walters Family Trust dated 7/6/2020

Original option grant size 145,018 shares Stock options granted May 19, 2022, vesting May 19, 2023

Previously exercised options 50,000 shares Portion of the 2022 option grant exercised on December 4, 2025

Key Terms

weighted average price, restricted stock unit ("RSU"), Stock Option (Right to Buy), open-market sale, +1 more

5 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

restricted stock unit ("RSU") financial

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

Stock Option (Right to Buy) financial

"security_title": "Stock Option (Right to Buy)""

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Family Trust financial

"Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020"

FAQ

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

What insider transactions did EOSE director Marian Walters report on this Form 4?

Marian Walters reported exercising restricted stock units and stock options for 30,792 EOSE shares and selling 7,681 common shares. The filing shows a combination of derivative exercises and an open-market sale on the same date.

How many Eos Energy (EOSE) shares did Marian Walters sell and at what price?

Walters sold 7,681 Eos Energy common shares in an open-market transaction at a weighted average price of $7.07. Footnotes explain these shares traded in multiple transactions between $7.01 and $7.24 per share.

How many EOSE shares did Marian Walters acquire through option and RSU exercises?

Walters acquired 30,792 EOSE shares through derivative exercises, including 23,111 shares from restricted stock units and 7,681 shares from stock options. These conversions turned compensation awards into common stock on the reported transaction date.

What are Marian Walters’ Eos Energy shareholdings after the reported transactions?

After the transactions, Walters directly holds 135,334 Eos Energy common shares. The filing also shows 5,000 additional shares held indirectly through the D. and M. Walters Family Trust dated July 6, 2020.

What was the exercise price of Marian Walters’ EOSE stock options in this filing?

The stock options exercised for 7,681 shares had an exercise price of $1.18 per share. These options were originally granted in May 2022 as part of a 145,018-share award that vested in May 2023, according to the footnotes.

How were Marian Walters’ restricted stock units described in the EOSE Form 4?

Each restricted stock unit is described as a contingent right to receive one Eos Energy common share. In this filing, 23,111 RSUs converted into an equal number of common shares when they were exercised on the reported date.

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

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Accepted by SEC EDGAR 05/19/2026 - 07:25 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)
05/19/2026

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	05/19/2026		M		7,681	A	$1.18	143,015	D
Common Stock	05/19/2026		S		7,681	D	$7.07(1)	135,334	D
Common Stock	05/19/2026		M		23,111	A	$0(2)	158,445	D
Common Stock								5,000	I	See footnote(3)

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	(2)	05/19/2026		M			23,111	(4)	(4)	Common Stock	23,111	$0	0	D
Stock Option (Right to Buy)	$1.18	05/19/2026		M			7,681	(5)	05/19/2027	Common Stock	7,681	$0	87,337	D

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.01 to $7.24, inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

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

3. Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020

4. Not applicable.

5. On May 19, 2022 the reporting person was granted stock options to purchase 145,018 shares of common stock which vested on May 19, 2023. 50,000 of these stock options were previously exercised on December 4, 2025.

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Marian Walters	05/19/2026
	** 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)