Eos Energy CAO sells 34K shares after RSU vesting

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

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) reported that Chief Accounting Officer Sumeet Puri exercised restricted stock units and sold a portion of the resulting common shares. On September 5, 2026, 68,333 restricted stock units were converted into 68,333 shares of common stock at a stated price of $0.00 per share. On September 9, 2026, 34,167 common shares were sold in open-market transactions at a weighted average price of $4.13 per share, with trade prices ranging from $4.07 to $4.27, pursuant to a Rule 10b5-1 trading plan adopted on September 15, 2025 to cover estimated tax withholding obligations related to RSU vesting.

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 34,167 shs ($141K)

Approx. gross sale proceeds $141K

Type	Security	Shares	Price	Value
Sale	Common Stock F2, F3	34,167	$4.13	$141K
Exercise	Restricted Stock Units F4, F1, F5	68,333	$0.00	$0.00
Exercise	Common Stock F1	68,333	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 236,445 shares (Direct)

Footnotes (5)

1. F1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.
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 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 $4.07 to $4.27, 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. The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date.
5. F5. Not applicable.

Key Figures

Common shares sold: 34,167 shares Weighted average sale price: $4.13 per share RSUs converted to common stock: 68,333 units/shares +2 more

5 metrics

Common shares sold 34,167 shares Open-market sale on September 9, 2026 by the Chief Accounting Officer

Weighted average sale price $4.13 per share Shares sold in multiple trades ranging from $4.07 to $4.27 on September 9, 2026

RSUs converted to common stock 68,333 units/shares Restricted stock units converted into common stock on September 5, 2026

Stated RSU conversion price $0.00 per share Price per share reported for the RSU-to-common-stock conversion on September 5, 2026

Rule 10b5-1 plan adoption date September 15, 2025 Trading plan under which the September 9, 2026 sales were effected

Key Terms

Rule 10b5-1 trading plan, restricted stock unit, weighted average price, tax withholding obligations

4 terms

Rule 10b5-1 trading plan regulatory

"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.

restricted stock unit financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one share"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

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.

tax withholding obligations financial

"trading plan adopted ... to cover estimated tax withholding obligations in connection"

FAQ

What insider transactions did EOSE report for Chief Accounting Officer Sumeet Puri?

The filing reports that 68,333 restricted stock units were converted into common stock on September 5, 2026, and 34,167 common shares were sold on September 9, 2026 in open-market transactions under a pre-arranged Rule 10b5-1 trading plan.

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

On September 9, 2026, the insider sold 34,167 common shares of Eos Energy Enterprises at a weighted average price of $4.13 per share, with individual trades executed between $4.07 and $4.27 per share.

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

Yes. The sales 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 associated with the vesting of restricted stock units.

What RSU activity involving EOSE stock did the Form 4 disclose?

The Form 4 discloses that on September 5, 2026, 68,333 restricted stock units, each representing a contingent right to receive one share of Eos Energy common stock, were converted into 68,333 common shares at a stated price of $0.00 per share.

What is the nature of the RSU grant reported for EOSE’s Chief Accounting Officer?

The reporting person received a grant of RSUs under Eos Energy’s 2020 Incentive Plan. The RSUs are scheduled to vest in three installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date.

Did the Form 4 state the number of EOSE shares held after these transactions?

No. The Form 4 provides the shares involved in the exercise and sale but does not report a total common share holding for the reporting person after the transactions.

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

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Available on EDGAR 09/09/2026 - 06:05 PM Accepted by SEC EDGAR 09/09/2026 - 06:05 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)
09/05/2026

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	09/05/2026		M		68,333	A	$0(1)	270,612	D
Common Stock	09/09/2026		S(2)		34,167	D	$4.13(3)	236,445	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
Restricted Stock Units(4)	(1)	09/05/2026		M			68,333	(5)	(5)	Common Stock	68,333	$0	0	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.

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 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 $4.07 to $4.27, 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. The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date.

5. Not applicable.

Remarks:

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