Eos Energy director exercises rights, gains stock, warrants

Jeffrey S. Bornstein, a director of Eos Energy Enterprises, exercised 9,558 subscription rights in a rights offering that closed on July 21, 2026, receiving 9,558 shares of common stock at a $5.48 exercise price and 4,194 warrants.

Rhea-AI Filing Summary

Jeffrey S. Bornstein, a director of Eos Energy Enterprises, exercised 9,558 subscription rights in a rights offering that closed on July 21, 2026, receiving 9,558 shares of common stock at a $5.48 exercise price and 4,194 warrants. He now holds 143,806 common shares directly, 1,500 shares indirectly via his spouse, and 4,194 warrants that became immediately exercisable and expire 10 years after the rights offering unless exercised or redeemed earlier.

Insider Trade Summary

13,752 shares exercised/converted

Exercise 4 txns

Insider Bornstein Jeffrey S

Role Director

Type	Security	Shares	Price	Value
Exercise	Subscription Rights (right to buy) F1	9,558	$0.00	$0.00
Exercise	Warrant (right to buy) F1, F2	4,194	$0.00	$0.00
Exercise	Common Stock F1	9,558	$5.48	$52K
holding	Common Stock	--	--	--

Holdings After Transaction: Subscription Rights (right to buy) — 0 contracts (Direct); Warrant (right to buy) — 4,194 contracts (Direct); Common Stock — 143,806 shares (Direct); Common Stock — 1,500 shares (Indirect, By Spouse)

Footnotes (2)

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. 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

Common shares acquired: 9,558 shares Exercise price: $5.48 per share Warrants acquired: 4,194 warrants +4 more

7 metrics

Common shares acquired 9,558 shares Shares of common stock received upon exercise of subscription rights on July 21, 2026

Exercise price $5.48 per share Exercise price for common stock and related warrants in the rights offering

Warrants acquired 4,194 warrants Warrants received as part of units for exercised subscription rights

Direct common shares after transaction 143,806 shares Direct common stock holdings of Jeffrey S. Bornstein following the reported transactions

Indirect common shares by spouse 1,500 shares Common stock indirectly owned through spouse after the transaction

Subscription rights converted 9,558 rights Subscription rights exercised and converted into units in the rights offering that closed July 21, 2026

Warrant term 10 years Period until warrant expiration after becoming exercisable following the July 21, 2026 rights offering

Key Terms

rights offering, subscription right, warrant, exercise price

4 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 as part of a rights offering"

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

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

FAQ

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

What insider transaction did EOSE director Jeffrey S. Bornstein report on this Form 4?

Jeffrey S. Bornstein reported exercising 9,558 subscription rights in Eos Energy’s rights offering, acquiring 9,558 common shares at a $5.48 exercise price and 4,194 warrants linked to that offering.

How many EOSE common shares does Jeffrey S. Bornstein own after the July 21, 2026 transactions?

After the reported transactions, Bornstein directly owns 143,806 shares of Eos Energy common stock and indirectly holds an additional 1,500 shares through his spouse, as disclosed in the Form 4.

What are the terms of the EOSE warrants received by Jeffrey S. Bornstein?

Bornstein received 4,194 warrants, each exercisable to acquire one share of Eos Energy common stock at an exercise price of $5.48 per share. The warrants became exercisable immediately after the rights offering and expire 10 years later unless exercised or redeemed earlier.

How was EOSE’s rights offering structured for Jeffrey S. Bornstein’s subscription rights?

Each subscription right was exercisable for units consisting of 1 share of common stock and 0.4388 of a warrant with a $5.48 exercise price. Bornstein converted 9,558 subscription rights into these units when the rights offering closed on July 21, 2026.

Does Jeffrey S. Bornstein report any indirect ownership of EOSE stock?

Yes. In addition to his direct holdings, Bornstein reports indirect ownership of 1,500 shares of Eos Energy common stock held "By Spouse", indicating spousal ownership attributed to him.

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

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Available on EDGAR 08/06/2026 - 08:10 AM Accepted by SEC EDGAR 08/06/2026 - 08:10 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^*

Bornstein Jeffrey S

(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)		9,558	A	$5.48	143,806	D
Common Stock								1,500	I	By Spouse

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)			9,558	(1)	07/21/2026	Common Stock	9,558	$0	0	D
Warrant (right to buy)	$5.48	07/21/2026		M(1)		4,194		(1)(2)	(2)	Common Stock	4,194	$0	4,194	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. 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 Jeffrey Bornstein	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)