Eos Energy CAO sells 43,750 shares at $3.92

Eos Energy’s chief accounting officer exercised 2024 performance-based RSUs and sold shares under a Rule 10b5-1 plan to cover tax withholding.

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) reported that Chief Accounting Officer Sumeet Puri had 2024 performance-based restricted stock units vest on September 14, 2026, resulting in the acquisition of 87,500 shares of common stock. On September 16, 2026, an automatic sale of 43,750 shares at a weighted average price of $3.92 per share was executed under a Rule 10b5-1 trading plan to cover estimated tax withholding obligations.

Insider Trade Summary 10b5-1

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Puri Sumeet

Role Chief Accounting Officer

Sold 43,750 shs ($172K)

Approx. gross sale proceeds $172K

Type	Security	Shares	Price	Value
Sale	Common Stock F2, F3	43,750	$3.92	$172K
Exercise	Performance-Based Restricted Stock Units F1, F4, F5	87,500	$0.00	$0.00
Exercise	Common Stock F1	87,500	$0.00	$0.00

Holdings After Transaction: Performance-Based Restricted Stock Units — 0 contracts (Direct); Common Stock — 280,195 shares (Direct)

Footnotes (5)

1. F1. On July 5, 2024, the Reporting Person was granted performance-based restricted stock units ("2024 PRSU Awards"). The 2024 PRSU Awards are eligible to vest in up to two installments based on the total shareholder return of the Issuer over two- and three-year performance periods, each commencing on July 5, 2024. On September 14, 2026, the Compensation Committee of the Issuer's Board of Directors certified the achievement of the first performance period, resulting in the vesting of these shares.
2. F2. The sales reported in this Form 4 were effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 15, 2025 to cover estimated tax withholding obligations in connection with the vesting of performance-based restricted stock units.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.85 to $4.16, 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.
4. F4. Represents the outstanding awarded and vested units pursuant to the 2024 PRSU Awards dated July 25, 2024 related to the achievement of certain total shareholder return objectives.
5. F5. Not applicable.

Key Figures

Shares sold: 43,750 shares Weighted average sale price: $3.92 per share Sale price range: $3.85–$4.16 per share +3 more

6 metrics

Shares sold 43,750 shares Common stock sold by Sumeet Puri on September 16, 2026

Weighted average sale price $3.92 per share Sale of 43,750 shares on September 16, 2026

Sale price range $3.85–$4.16 per share Price range for multiple sale transactions on September 16, 2026

RSUs converted to common stock 87,500 units/shares 2024 performance-based RSUs vesting into common stock on September 14, 2026

Rule 10b5-1 plan adoption date September 15, 2025 Trading plan covering the tax-withholding share sale

Certified performance period date September 14, 2026 Compensation committee certified first performance period for 2024 PRSU Awards

Key Terms

Rule 10b5-1 trading plan, performance-based restricted stock units, total shareholder return, weighted average price

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 were effected automatically pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

performance-based restricted stock units financial

"the Reporting Person was granted performance-based restricted stock units ("2024 PRSU Awards")"

Performance-based restricted stock units are a type of employee equity award that converts into company shares only if predefined financial or operational targets are met over a set period. Think of it like a bonus check that becomes stock only when specific goals are hit; it ties pay to results, aligning managers’ incentives with shareholders. Investors care because these awards affect future share count, executive incentives, and signal how management’s success will be measured and rewarded.

total shareholder return financial

"eligible to vest in up to two installments based on the total shareholder return of the Issuer"

Total shareholder return is the overall gain an investor gets from owning a stock, combining changes in the share price plus any cash payouts like dividends, and assuming those payouts are reinvested in more shares. Investors use it like a single score that shows the true return on their investment—similar to checking both the growth of a savings account and the interest earned—to compare how well different companies or investments perform over time.

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.

FAQ

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

What insider transaction did EOSE disclose for Chief Accounting Officer Sumeet Puri?

EOSE disclosed that Chief Accounting Officer Sumeet Puri had 87,500 performance-based RSUs vest into common stock on September 14, 2026, and an automatic sale of 43,750 shares was executed on September 16, 2026 to cover estimated tax withholding obligations.

How many EOSE shares did the insider sell and at what price?

Sumeet Puri sold 43,750 shares of EOSE common stock on September 16, 2026 at a weighted average price of $3.92 per share, with individual trade prices ranging from $3.85 to $4.16, inclusive.

Were the EOSE insider sales made under a Rule 10b5-1 trading plan?

Yes. The filing states the sales were effected automatically under a Rule 10b5-1 trading plan adopted by Sumeet Puri on September 15, 2025 to cover estimated tax withholding obligations related to vesting performance-based restricted stock units.

What performance condition triggered the vesting of EOSE RSUs for Sumeet Puri?

The vested RSUs were part of the 2024 performance-based restricted stock unit awards, which vest based on Eos Energy’s total shareholder return over specified two- and three-year performance periods. The compensation committee certified achievement of the first performance period on September 14, 2026.

How many EOSE RSUs were exercised or converted in this Form 4 filing?

The filing reports the exercise or conversion of 87,500 performance-based restricted stock units into 87,500 shares of EOSE common stock, associated with the 2024 performance-based restricted stock unit awards.

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

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Available on EDGAR 09/16/2026 - 04:29 PM Accepted by SEC EDGAR 09/16/2026 - 04:28 PM 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).

X

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^*

Puri Sumeet

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026

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	09/14/2026		M		87,500	A	$0(1)	323,945	D
Common Stock	09/16/2026		S(2)		43,750	D	$3.92(3)	280,195	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
Performance-Based Restricted Stock Units(1)	(1)	09/14/2026		M			87,500(4)	(5)	(5)	Common Stock	87,500	$0	0	D

Explanation of Responses:

1. On July 5, 2024, the Reporting Person was granted performance-based restricted stock units ("2024 PRSU Awards"). The 2024 PRSU Awards are eligible to vest in up to two installments based on the total shareholder return of the Issuer over two- and three-year performance periods, each commencing on July 5, 2024. On September 14, 2026, the Compensation Committee of the Issuer's Board of Directors certified the achievement of the first performance period, resulting in the vesting of these shares.

2. The sales reported in this Form 4 were effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 15, 2025 to cover estimated tax withholding obligations in connection with the vesting of performance-based restricted stock units.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.85 to $4.16, 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.

4. Represents the outstanding awarded and vested units pursuant to the 2024 PRSU Awards dated July 25, 2024 related to the achievement of certain total shareholder return objectives.

5. Not applicable.

Remarks:

	/s/ Sumeet Puri	09/16/2026
	** 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)