Eos Energy director exercises rights, adds shares

Eos Energy Enterprises, Inc. director Marian Walters exercised 11,407 subscription rights on July 21, 2026, in connection with a Rights Offering.

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. director Marian Walters exercised 11,407 subscription rights on July 21, 2026, in connection with a Rights Offering. Each right converted into 1 share of common stock and 0.4388 of a warrant at an exercise price of $5.48 per share, resulting in 11,407 common shares and 5,005 warrants. Following the transactions, Walters holds 171,634 common shares directly and 5,000 shares indirectly through the D. and M. Walters Family Trust. The warrants became exercisable immediately after the Rights Offering closed and expire 10 years later unless exercised or redeemed earlier.

Insider Trade Summary

16,412 shares exercised/converted

Exercise 4 txns

Insider Walters Marian

Role Director

Type	Security	Shares	Price	Value
Exercise	Subscription Rights (right to buy) F1, F3	11,407	$0.00	$0.00
Exercise	Warrant (right to buy) F1, F3	5,005	$0.00	$0.00
Exercise	Common Stock F1	11,407	$5.48	$63K
holding	Common Stock F2	--	--	--

Holdings After Transaction: Subscription Rights (right to buy) — 0 contracts (Direct); Warrant (right to buy) — 5,005 contracts (Direct); Common Stock — 171,634 shares (Direct); Common Stock — 5,000 shares (Indirect, See footnote)

Footnotes (3)

1. F1. Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the "Rights Offering"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share.
2. F2. Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020.
3. F3. Warrants became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed earlier. If a warrant is not exercised or redeemed before it expires, it will have no value.

Key Figures

Subscription rights exercised: 11,407 rights Common shares acquired: 11,407 shares Warrants acquired: 5,005 warrants +3 more

6 metrics

Subscription rights exercised 11,407 rights Conversion of subscription rights in Rights Offering closed on July 21, 2026

Common shares acquired 11,407 shares Shares received upon exercising subscription rights at $5.48 per share

Warrants acquired 5,005 warrants 0.4388 of a warrant per subscription right as part of units

Warrant exercise price $5.48 per share Exercise price for warrants received in the Rights Offering

Direct common stock holdings after 171,634 shares Directly held Eos Energy common stock after the transactions

Indirect common stock holdings 5,000 shares Held by D. and M. Walters Family Trust where Marian Walters is trustee

Key Terms

Rights Offering, subscription right, warrant, exercise price, +1 more

5 terms

Rights Offering financial

"issued by the Issuer as part of a rights offering that closed on July 21, 2026"

A rights offering is a way for a company to raise additional money by giving existing shareholders the opportunity to buy more shares at a discounted price before they are offered to the public. It’s similar to a special sale where current owners get the first chance to buy extra items at a lower cost, allowing them to increase their investment if they choose. This process matters to investors because it can affect the value of their holdings and their ability to buy new shares at favorable terms.

subscription right financial

"Represents the conversion of a subscription right issued by the Issuer"

A subscription right is a short‑term entitlement given to existing shareholders that lets them buy additional shares at a set price before the shares are offered to the public. Like a limited-time coupon to buy more of a product, it matters to investors because exercising the right can prevent ownership from being diluted and may offer a discounted chance to increase holdings, while selling the right can provide immediate cash if they don’t want more shares.

warrant financial

"0.4388 of a warrant exercisable to acquire a share of common stock"

A warrant is a time-limited financial contract that gives its holder the right to buy a company's shares at a set price before a specified date, like a coupon that lets you purchase stock at a fixed discount for a limited time. It matters to investors because warrants offer leveraged exposure to a stock’s upside and can dilute existing shareholders if exercised, so they affect potential gains and the company’s outstanding share count.

exercise price financial

"at an exercise price of $5.48 per share"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

Family Trust financial

"held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust"

FAQ

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

What insider transaction did Marian Walters report for EOSE?

Marian Walters reported exercising 11,407 subscription rights in Eos Energy Enterprises, Inc., converting them into 11,407 common shares and 5,005 warrants. The transaction occurred on July 21, 2026 as part of a Rights Offering that had recently closed.

How many Eos Energy (EOSE) common shares did Marian Walters acquire?

Marian Walters acquired 11,407 common shares of Eos Energy through the conversion of subscription rights at $5.48 per share. After this transaction, her directly held common stock position increased to 171,634 shares, as reported in the filing.

What warrants did Marian Walters receive in the EOSE Rights Offering?

Each subscription right produced 0.4388 of a warrant, giving Marian Walters 5,005 warrants exercisable for Eos Energy common stock. These warrants became exercisable immediately after the Rights Offering closed and will expire 10 years later unless exercised or redeemed earlier.

What is the exercise price and term of the EOSE warrants reported?

The warrants received by Marian Walters are exercisable to acquire Eos Energy common stock at an exercise price of $5.48 per share. They became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed sooner.

What are Marian Walters' total EOSE shareholdings after the transactions?

After the reported transactions, Marian Walters holds 171,634 common shares directly. She also has indirect ownership of 5,000 common shares held by the D. and M. Walters Family Trust, where she and David Walters serve as trustees.

How are the 5,000 indirectly owned EOSE shares held for Marian Walters?

The 5,000 indirectly owned Eos Energy shares are of record held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dated July 6, 2020, giving her indirect beneficial ownership as disclosed in the filing footnote.

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

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Available on EDGAR 08/06/2026 - 08:12 AM Accepted by SEC EDGAR 08/06/2026 - 08:11 AM 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.

TWO ALLEGHENY CENTER, NOVA TOWER 2

(Street)

PITTSBURGH PENNSYLVANIA 15212

(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)
07/21/2026

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	07/21/2026		M(1)		11,407	A	$5.48	171,634	D
Common Stock								5,000	I	See footnote(2)

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
Subscription Rights (right to buy)	$5.48	07/21/2026		M(1)			11,407	(1)(3)	07/21/2026	Common Stock	11,407	$0	0	D
Warrant (right to buy)	$5.48	07/21/2026		M(1)		5,005		(1)(3)	(3)	Common Stock	5,005	$0	5,005	D

Explanation of Responses:

1. Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the "Rights Offering"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share.

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

3. Warrants became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed earlier. If a warrant is not exercised or redeemed before it expires, it will have no value.

Remarks:

	/s/ Sumeet Puri as attorney-in-fact for Marian Walters	08/06/2026
	** 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)