Eos Energy (EOSE) CEO exercises 200,000 options and retains stock stake

Rhea-AI Filing Summary

Eos Energy Enterprises CEO Joe Mastrangelo exercised stock options and increased his direct share ownership. He exercised options for 200,000 shares of common stock at an exercise price of $1.34 per share and retained the underlying shares. To cover tax obligations on this compensation event, 116,646 shares of common stock were disposed of at a reference price of $6.06 per share, a non-market tax-withholding mechanism rather than an open-market sale. After these transactions, he directly holds 1,570,480 shares of common stock. A footnote explains the options were Non-Qualified Stock Options granted in June 2022, fully vested in September 2022, and that he chose to keep the net shares to support a long-term equity position, including in connection with any potential future equity or rights offerings by the company.

Insights

Equity compensation analyst

CEO exercised options, paid taxes in shares, and kept the net stock.

Joe Mastrangelo exercised 200,000 Non-Qualified Stock Options at $1.34 per share, converting a derivative award into common stock. A related Form 4 line in derivatives shows the stock option position dropping to zero, indicating a full exercise of that grant.

The filing also reports a disposition of 116,646 shares coded "F" at $6.06 per share, which the description identifies as payment of tax liability using shares. This is a standard, non-market mechanism and not an open-market sale.

Following the transactions, Mastrangelo directly holds 1,570,480 shares of common stock. The footnote states he elected to retain the net shares to maintain a long-term equity position, including for any potential future equity or rights offerings, framing this as compensation alignment rather than trading activity.

Insider Trade Summary

200,000 shares exercised/converted

Mixed 3 txns

Insider Mastrangelo Joe

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	200,000	$0.00	--
Exercise	Common Stock	200,000	$1.34	$268K
Tax Withholding	Common Stock	116,646	$6.06	$707K

Holdings After Transaction: Stock Option (Right to Buy) — 0 shares (Direct, null); Common Stock — 1,687,126 shares (Direct, null)

Footnotes (1)

1. The transactions reported in this Form 4 reflect the exercise of Non-Qualified Stock Options by the Reporting Person and the subsequent retention of the underlying shares of Common Stock. The option exercise and corresponding acquisition of shares reported in Table I and Table II were exempted from Section 16(b) liability pursuant to Rule 16b-3 promulgated under the Securities Exchange Act of 1934. The Reporting Person has elected to retain the net shares acquired upon exercise to maintain and support their long-term equity position in the Issuer, including in connection with any potential future equity or rights offerings that may be conducted by the Issuer. On June 16, 2022 the reporting person was granted stock options to purchase 200,000 shares of common stock which vested on September 27, 2022.

Key Figures

Options exercised: 200,000 shares Exercise price: $1.34 per share Shares for tax withholding: 116,646 shares at $6.06 +4 more

7 metrics

Options exercised 200,000 shares Non-Qualified Stock Options exercised into common stock

Exercise price $1.34 per share Option strike price for 200,000 shares

Shares for tax withholding 116,646 shares at $6.06 Disposition coded F to cover tax liability

Shares held after transactions 1,570,480 shares Direct common stock ownership after Form 4 events

Option grant date June 16, 2022 Grant of options for 200,000 shares

Option vesting date September 27, 2022 Vesting of 200,000-share option grant

Option expiration June 16, 2032 Expiration date shown for exercised option series

Key Terms

Non-Qualified Stock Options, Section 16(b), Rule 16b-3, equity or rights offerings

4 terms

Non-Qualified Stock Options financial

"The transactions reported in this Form 4 reflect the exercise of Non-Qualified Stock Options by the Reporting Person"

Non-qualified stock options are a type of employee benefit that gives individuals the right to buy company shares at a set price, usually lower than the market value, within a certain period. Unlike other options that may have special tax advantages, these options are taxed as income when exercised, which can affect how much money the employee or investor ultimately gains. They are important because they can influence company compensation strategies and impact the financial outcomes for employees and investors.

Section 16(b) regulatory

"were exempted from Section 16(b) liability pursuant to Rule 16b-3 promulgated under the Securities Exchange Act of 1934"

A federal rule that requires company insiders—like officers, directors and large shareholders—to return any profits made from buying and selling the company’s stock within a six-month window. It matters to investors because it discourages short-term trades that could exploit non-public information and helps protect outside shareholders by creating a simple, enforceable way to recover unfair gains, much like a rule stopping someone from flipping a limited-edition item for quick profit after getting early access.

Rule 16b-3 regulatory

"were exempted from Section 16(b) liability pursuant to Rule 16b-3 promulgated under the Securities Exchange Act of 1934"

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

equity or rights offerings financial

"to maintain and support their long-term equity position in the Issuer, including in connection with any potential future equity or rights offerings"

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

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)
06/12/2026

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	06/12/2026		M		200,000	A	$1.34	1,687,126	D
Common Stock	06/12/2026		F		116,646(1)	D	$6.06	1,570,480	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
Stock Option (Right to Buy)	$1.34	06/12/2026		M			200,000	(2)	06/16/2032	Common Stock	200,000	$0	0	D

Explanation of Responses:

1. The transactions reported in this Form 4 reflect the exercise of Non-Qualified Stock Options by the Reporting Person and the subsequent retention of the underlying shares of Common Stock. The option exercise and corresponding acquisition of shares reported in Table I and Table II were exempted from Section 16(b) liability pursuant to Rule 16b-3 promulgated under the Securities Exchange Act of 1934. The Reporting Person has elected to retain the net shares acquired upon exercise to maintain and support their long-term equity position in the Issuer, including in connection with any potential future equity or rights offerings that may be conducted by the Issuer.

2. On June 16, 2022 the reporting person was granted stock options to purchase 200,000 shares of common stock which vested on September 27, 2022.

Remarks:

	/s/ Michael Silberman as attorney-in-fact for Joe Mastrangelo	06/15/2026
	** 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)

FAQ

What did EOSE CEO Joe Mastrangelo do in this Form 4 filing?

Joe Mastrangelo exercised stock options for 200,000 EOSE common shares and kept the resulting stock. A related tax-withholding transaction used 116,646 shares to cover obligations, leaving him with 1,570,480 directly held shares afterward.

How many Eos Energy (EOSE) shares did the CEO acquire and at what price?

He acquired 200,000 Eos Energy common shares by exercising Non-Qualified Stock Options at an exercise price of $1.34 per share. This converted a derivative compensation award into actual stock that he chose to retain for long-term ownership.

Was the share disposition in Joe Mastrangelo’s EOSE Form 4 an open-market sale?

No. The 116,646-share disposition is coded “F” for tax withholding. The filing describes it as payment of tax liability by delivering securities, a routine mechanism rather than an open-market trade on an exchange.

How many Eos Energy (EOSE) shares does the CEO hold after these transactions?

After the option exercise and tax-withholding disposition, Joe Mastrangelo directly holds 1,570,480 shares of Eos Energy common stock. This post-transaction figure reflects his remaining equity position reported in the Form 4 for this set of transactions.

What do the footnotes in the EOSE Form 4 say about the CEO’s intentions?

The footnotes state the Form 4 reflects exercise of Non-Qualified Stock Options and retention of the underlying shares. They add he elected to keep the net shares to maintain a long-term equity position, including for any potential future equity or rights offerings.

When were the EOSE stock options granted and when did they vest?

The footnotes explain the reporting person was granted stock options to purchase 200,000 Eos Energy common shares on June 16, 2022. These options fully vested on September 27, 2022, before being exercised in the transactions reported in this Form 4.