Eos Energy officer plans $95.3K share sale

The planned sale is described as covering estimated tax withholding obligations tied to restricted stock unit vesting.

Available on EDGAR 10/29/2026 - 04:05 PM EDT Accepted by SEC EDGAR 10/29/2026 - 04:04 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. officer Michelle Buczkowski reported a proposed sale of 50,000 common shares, with an aggregate market value of $95,250 and an approximate sale date of October 29, 2026. The shares were acquired from the issuer through restricted stock unit vesting on October 28, 2026. The proposed sale is pursuant to a Rule 10b5-1 trading plan adopted by Buczkowski to cover estimated tax withholding obligations from the vesting.

Key Figures

Shares to be sold: 50,000 shares Aggregate market value: $95,250 Shares outstanding: 364,167,744 shares +1 more

4 metrics

Shares to be sold 50,000 shares Proposed sale; approximate sale date October 29, 2026

Aggregate market value $95,250 Proposed sale of common shares

Shares outstanding 364,167,744 shares Issuer share count listed on the notice

Shares acquired through RSU vesting 50,000 shares Acquired from the issuer on October 28, 2026

Key Terms

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

3 terms

Rule 10b5-1 trading plan regulatory

"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 units financial

"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.

Rule 144 regulatory

"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.

FAQ

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

How many EOSE shares does Michelle Buczkowski plan to sell?

Michelle Buczkowski reported a proposed sale of 50,000 common shares, with an aggregate market value of $95,250. The approximate sale date is October 29, 2026.

What is Michelle Buczkowski's planned EOSE share sale intended to cover?

The remarks state that the proposed sale under a Rule 10b5-1 trading plan is intended to cover estimated tax withholding obligations from the vesting of restricted stock units.

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

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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	0002096705
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	Buczkowski Michelle
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. Eleven Madison Avenue 4th Floor New York NY 10010	50000	95250.00	364167744	10/29/2026	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	10/28/2026	RSU Vesting	Issuer			50000	10/28/2026	NA

* 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

Nothing to Report

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	10/29/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/11/2025
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 Michelle Buczkowski
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)