Eos Energy insider plans sale of 34,167 shares

Director-level holder Sumeet Puri has arranged Rule 10b5-1 sales of EOSE shares tied to RSU vesting and recent prior transactions.

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) disclosed that Sumeet Puri plans to sell 34,167 shares of common stock, expected to be acquired upon RSU vesting on September 5, 2026. The planned sales will be made under a Rule 10b5-1 trading plan to cover estimated tax withholding obligations from these restricted stock units.

Over the prior three months, Sumeet Puri sold 8,823 shares of common stock on June 30, 2026 for $51,693.07 and 29,167 shares on July 28, 2026 for $97,922.37.

Key Figures

Planned shares to be sold: 34,167 shares Sale on June 30, 2026: 8,823 shares; $51,693.07 Sale on July 28, 2026: 29,167 shares; $97,922.37 +2 more

5 metrics

Planned shares to be sold 34,167 shares Common stock tied to RSU vesting on September 5, 2026

Sale on June 30, 2026 8,823 shares; $51,693.07 Common stock sold by Sumeet Puri during prior three months

Sale on July 28, 2026 29,167 shares; $97,922.37 Common stock sold by Sumeet Puri during prior three months

Planned sale date reference September 5, 2026 Date of RSU vesting associated with the 34,167 shares

Date of notice September 9, 2026 Date the notice covering the planned sale was provided

Key Terms

Rule 144, Rule 10b5-1 trading plan, restricted stock units, estimated tax withholding obligations

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Rule 10b5-1 trading plan regulatory

"will be sold pursuant to a Rule 10b5-1 trading plan adopted"

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 units financial

"from the vesting of restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

estimated tax withholding obligations financial

"to cover estimated tax withholding obligations from the vesting"

FAQ

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

What does the Form 144 notice disclose for EOSE and Sumeet Puri?

It discloses that 34,167 EOSE common shares are planned for sale by Sumeet Puri under a Rule 10b5-1 trading plan in connection with RSU vesting and related tax withholding obligations.

How many EOSE shares is Sumeet Puri planning to sell under this plan?

Sumeet Puri plans to sell 34,167 shares of Eos Energy Enterprises, Inc. common stock. These shares relate to restricted stock units vesting on September 5, 2026 and are intended to cover estimated tax withholding obligations.

When do the restricted stock units related to Sumeet Puri’s EOSE sale vest?

The restricted stock units related to the planned sale of 34,167 EOSE shares are scheduled to vest on September 5, 2026, and the shares reported are tied to this vesting event.

What EOSE share sales has Sumeet Puri made in the last three months?

In the last three months, Sumeet Puri sold 8,823 EOSE shares on June 30, 2026 for $51,693.07 and 29,167 shares on July 28, 2026 for $97,922.37.

What is the purpose of Sumeet Puri’s Rule 10b5-1 trading plan for EOSE shares?

The Rule 10b5-1 trading plan is intended to sell EOSE shares to cover estimated tax withholding obligations arising from the vesting of restricted stock units held by Sumeet Puri.

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

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Available on EDGAR 09/09/2026 - 04:13 PM EDT Accepted by SEC EDGAR 09/09/2026 - 04:11 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001991521
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Eos Energy Enterprises, Inc.
SEC File Number	001-39291
Address of Issuer	TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PENNSYLVANIA 15212
Phone	(732) 225-8400
Name of Person for Whose Account the Securities are To Be Sold	Puri Sumeet
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	UBS Financial Services, Inc. 11 Madison Avenue 4th Floor New York NY 10010	34167	142818.06	364167744	09/09/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/05/2026	RSU Vesting	Issuer			34167	09/05/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Sumeet Puri TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PA 15212	Common	06/30/2026	8823	51693.07
Sumeet Puri TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PA 15212	Common	07/28/2026	29167	97922.37

144: Remarks and Signature

Remarks	The shares reported on this Form 144 will be sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person to cover estimated tax withholding obligations from the vesting of restricted stock units.
Date of Notice	09/09/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/12/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ UBS Financial Services Inc, as attorney-in-fact for Sumeet Puri
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)