Eos Energy ex-officer plans $454K stock sale

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) received a notice that former officer Michael W. Silberman intends to sell 109,375 shares of common stock under Rule 144, with an aggregate market value of $453,906.25, through UBS Financial Services Inc. The shares relate to restricted stock units scheduled to vest on September 14, 2026 and are to be sold pursuant to a Rule 10b5-1 trading plan adopted to cover estimated tax withholding obligations from the vesting. The notice also lists Silberman’s prior Rule 144 sales of Eos common stock during the past three months.

Key Figures

Planned shares to be sold: 109,375 shares Aggregate market value of planned sale: $453,906.25 Shares outstanding: 364,167,744 shares +4 more

7 metrics

Planned shares to be sold 109,375 shares Shares of Eos Energy Enterprises common stock covered by the Rule 144 notice

Aggregate market value of planned sale $453,906.25 Aggregate market value associated with the 109,375 shares in the Rule 144 filing

Shares outstanding 364,167,744 shares Eos Energy Enterprises common stock outstanding cited in the notice

Recent sale on June 30, 2026 14,998 shares for $88,000.76 Common stock sold by Michael Silberman during the past three months

Recent sale on July 28, 2026 72,917 shares for $244,847.99 Common stock sold by Michael Silberman during the past three months

RSU vesting date September 14, 2026 Date the restricted stock units are scheduled to vest

Date of notice September 16, 2026 Date on which the Rule 144 notice was filed

Key Terms

Rule 144, Rule 10b5-1 trading plan, restricted stock units, 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.

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 filing report for EOSE?

It reports that former officer Michael W. Silberman intends to sell 109,375 shares of Eos Energy Enterprises common stock under Rule 144, through UBS Financial Services Inc., in connection with restricted stock units vesting on September 14, 2026.

How many EOSE shares are covered by Michael Silberman’s planned Rule 144 sale?

The notice covers 109,375 shares of Eos Energy Enterprises common stock, with an indicated aggregate market value of $453,906.25, to be sold through UBS Financial Services Inc.

Why are the EOSE shares being sold under Michael Silberman’s Rule 144 filing?

The shares are planned to be sold pursuant to a Rule 10b5-1 trading plan adopted by Michael Silberman to cover estimated tax withholding obligations arising from the vesting of restricted stock units on September 14, 2026.

What recent EOSE share sales by Michael Silberman are disclosed in the Form 144?

The notice lists past three-month sales of Eos common stock: 14,998 shares on June 30, 2026 for $88,000.76, and 72,917 shares on July 28, 2026 for $244,847.99.

What is the total number of EOSE shares outstanding cited in the Form 144?

The filing cites 364,167,744 shares of Eos Energy Enterprises common stock outstanding, as part of the securities information provided in the Rule 144 notice.

When was the Rule 144 notice for EOSE dated?

The Rule 144 notice relating to sales of Eos Energy Enterprises common stock was dated September 16, 2026, in connection with restricted stock units vesting on September 14, 2026.

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

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Available on EDGAR 09/16/2026 - 04:10 PM EDT Accepted by SEC EDGAR 09/16/2026 - 04:09 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	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	(732) 225-8400
Name of Person for Whose Account the Securities are To Be Sold	Silberman Michael W
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. 11 Madison Ave 4th Floor New York NY 10010	109375	453906.25	364167744	09/16/2026	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	09/14/2026	RSU Vesting	Issuer			109375	09/14/2026	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	88000.76
Michael Silberman TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PA 15212	Common	07/28/2026	72917	244847.99

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	09/16/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/15/2025
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 Michael W Silberman
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)