Eos Energy ex-officer plans 114K-share tax sale

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) is the issuer for which former officer Michael Silberman has filed a Form 144 notice covering the proposed sale of 114,650 shares of common stock through UBS Financial Services Inc. The notice states these shares are to be sold to cover estimated tax withholding obligations arising from the vesting of restricted stock units on September 22, 2026. The filing also lists prior sales of Eos common stock by Silberman over the past three months, alongside Eos common shares outstanding of 364,167,744 as of September 22, 2026.

Key Figures

Shares to be sold: 114,650 shares Aggregate market value of proposed sale: 467,263 Shares outstanding: 364,167,744 shares +5 more

8 metrics

Shares to be sold 114,650 shares Proposed sale of Eos common stock reported for September 22, 2026

Aggregate market value of proposed sale 467,263 Reported in the securities information section for the 114,650 shares

Shares outstanding 364,167,744 shares Eos common shares outstanding as of September 22, 2026

Shares sold June 30, 2026 14,998 shares Common stock sale by Michael Silberman during the past three months

Value of June 30, 2026 sale 88,000 Reported transaction value for 14,998 shares

Shares sold July 28, 2026 72,917 shares Common stock sale by Michael Silberman during the past three months

Shares sold September 16, 2026 109,375 shares Common stock sale by Michael Silberman during the past three months

Purpose of proposed sale Tax withholding on RSU vesting Shares to be sold to cover estimated tax withholding obligations from RSU vesting

Key Terms

Form 144, Rule 144, restricted stock units, aggregate market value

4 terms

Form 144 regulatory

"The shares reported on this will be sold to cover estimated"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

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.

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.

aggregate market value financial

"Common | UBS Financial Services Inc ... | 114650 | 467263 |"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does EOSE's latest Form 144 filing by Michael Silberman disclose?

The filing discloses that former officer Michael Silberman plans to sell 114,650 shares of Eos Energy Enterprises common stock through UBS Financial Services Inc. to cover estimated tax withholding obligations from restricted stock unit vesting on September 22, 2026.

How many Eos Energy Enterprises (EOSE) shares are proposed to be sold under this Form 144?

The Form 144 reports a proposed sale of 114,650 shares of common stock of Eos Energy Enterprises, Inc. in connection with RSU vesting and related estimated tax withholding obligations.

What does the Form 144 say about recent EOSE share sales by Michael Silberman?

The filing lists prior sales of Eos common stock by Michael Silberman over three dates: 14,998 shares on June 30, 2026, 72,917 shares on July 28, 2026, and 109,375 shares on September 16, 2026, with corresponding reported transaction values.

What is the reported market value of the EOSE shares covered by this Form 144?

The Form 144 reports an aggregate market value of 467,263 for the 114,650 Eos common shares proposed to be sold under this notice, as part of the securities information section.

How many Eos Energy Enterprises (EOSE) shares are reported as outstanding in the Form 144?

The securities information section reports that 364,167,744 shares of Eos Energy Enterprises common stock were outstanding as of September 22, 2026; this is presented as a baseline figure, not the amount being sold.

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

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Available on EDGAR 09/22/2026 - 04:49 PM Accepted by SEC EDGAR 09/22/2026 - 04:48 PM 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	0001813990
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	7322258400
Name of Person for Whose Account the Securities are To Be Sold	Michael Silberman
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	Former 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 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	114650	467263	364167744	09/22/2026	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	09/22/2026	RSU Vesting	Issuer			114650	09/22/2026	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
Michael Silberman Two Allegheny Center Nova Tower 2 Pittsburgh PA 15212	Common	06/30/2026	14998	88000
Michael Silberman Two Allegheny Center Nova Tower 2 Pittsburgh PA 15212	Common	07/28/2026	72917	244847
Michael Silberman Two Allegheny Center Nova Tower 2 Pittsburgh PA 15212	Common	09/16/2026	109375	429165

144: Remarks and Signature

Remarks	The shares reported on this Form 144 will be sold to cover estimated tax withholding obligations from the vesting of restricted stock units.
Date of Notice	09/22/2026
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/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Michael Silberman
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)