Eos Energy Enterprises (EOSE) CEO acquires 111,118 shares and 48,758 warrants

Rhea-AI Filing Summary

Eos Energy Enterprises CEO Joe Mastrangelo exercised subscription rights in a rights offering that closed on July 21, 2026, acquiring 111,118 shares of common stock at an exercise price of $5.48 per share and 48,758 warrants. His direct common-stock holdings rose to 2,058,704 shares, and he now holds 48,758 warrants exercisable at $5.48 that expire 10 years after the rights offering closed. The original subscription rights were fully converted and no longer outstanding.

Insider Trade Summary

Net Buyer: 111,118 shares

Net Buy 3 txns

Insider Mastrangelo Joe

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Subscription Rights (right to buy) F1	111,118	$0.00	$0.00
Exercise	Warrant (right to buy) F1, F2	48,758	$0.00	$0.00
Exercise	Common Stock F1	111,118	$5.48	$609K

Holdings After Transaction: Subscription Rights (right to buy) — 0 shares (Direct); Warrant (right to buy) — 48,758 shares (Direct); Common Stock — 2,058,704 shares (Direct)

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: 111118.0000 shares Warrants acquired: 48758.0000 warrants Exercise price per share: $5.48 per share +3 more

6 metrics

Common shares acquired 111118.0000 shares Shares of common stock received upon conversion of subscription rights on July 21, 2026

Warrants acquired 48758.0000 warrants Warrants received as part of the rights-offering unit structure, exercisable for common stock

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

Post-transaction common holdings 2058704.0000 shares Directly owned Eos Energy common shares after the rights conversion by the CEO

Warrant term 10 years Warrants expire 10 years after the July 21, 2026 rights offering closing, unless exercised or redeemed earlier

Warrant fraction per right 0.4388 Each subscription right provided 1 common share and 0.4388 of a warrant in the rights offering

Key Terms

Subscription Rights, Rights Offering, warrant, exercise price, +1 more

5 terms

Subscription Rights financial

"Represents the conversion of a subscription right issued by the Issuer as part of a rights offering"

Subscription rights are short-term privileges given to existing shareholders to buy additional new shares before the general public, typically at a set price and in proportion to their current holdings. Think of it as getting a coupon for first dibs on extra slices of a pizza so your share of the pie doesn’t shrink; exercising them can be a cheaper way to maintain your ownership and voting power, while ignoring them can reduce your stake and potential future earnings.

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.

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

"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.

redeemed financial

"Warrants became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed earlier"

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/06/2026 - 08:15 AM Accepted by SEC EDGAR 08/06/2026 - 08:14 AM Learn about SEC filing dates

FAQ

What insider transaction did EOSE report for CEO Joe Mastrangelo?

CEO Joe Mastrangelo exercised subscription rights in a rights offering that closed on July 21, 2026, acquiring 111,118 shares of common stock and 48,758 warrants. These transactions reflect the conversion of subscription rights into equity and derivative securities.

How many EOSE common shares did the CEO acquire and what are his holdings now?

Joe Mastrangelo acquired 111,118 shares of Eos Energy common stock at an exercise price of $5.48 per share. Following the transaction, his reported direct common-stock holdings increased to 2,058,704 shares, excluding any additional derivative securities such as warrants.

What warrants did the EOSE CEO receive and what are their terms?

The CEO received 48,758 warrants, each exercisable to acquire one share of common stock at an exercise price of $5.48 per share. The warrants became exercisable immediately after the rights offering closed and will expire 10 years later unless exercised or redeemed earlier.

Were any EOSE securities sold in this CEO Form 4 filing?

No sales of Eos Energy common stock were reported. Instead, subscription rights were disposed of through conversion into 111,118 common shares and 48,758 warrants. The subscription rights position went to zero as a result of this exercise and conversion.

Was the EOSE CEO’s transaction under a Rule 10b5-1 trading plan?

The filing indicates the transactions were not made pursuant to a Rule 10b5-1 trading plan, as the relevant checkbox was not affirmed. No footnotes describe any pre-arranged trading contract or instruction governing these specific rights-offering exercises.

What is the structure of the EOSE rights offering relevant to this CEO transaction?

Each subscription right in the Eos Energy rights offering was exercisable for units consisting of 1 share of common stock and 0.4388 of a warrant. The CEO’s reported conversion reflects this structure, producing both newly issued shares and associated warrants.

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.

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

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)		111,118	A	$5.48	2,058,704	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
Subscription Rights (right to buy)	$5.48	07/21/2026		M(1)			111,118	(1)	07/21/2026	Common Stock	111,118	$0	0	D
Warrant (right to buy)	$5.48	07/21/2026		M(1)		48,758		(1)(2)	(2)	Common Stock	48,758	$0	48,758	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 Joe Mastrangelo	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)