Eos Energy former officer plans 147,208-share sale

The stated reason for the sale is to cover estimated tax withholding obligations tied to restricted stock unit vesting.

Available on EDGAR 10/29/2026 - 04:52 PM EDT Accepted by SEC EDGAR 10/29/2026 - 04:51 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) reports a planned sale by former officer Nathan Kroeker of 147,208 common shares, with an aggregate market value of $290,267.53 and an approximate sale date of October 29, 2026. The shares are associated with restricted stock unit vesting; the stated purpose is to cover estimated tax withholding obligations. The notice also lists a sale of 165,625 common shares during the prior three months for $687,343.

Key Figures

Planned sale: 147,208 common shares Aggregate market value: $290,267.53 Approximate sale date: October 29, 2026 +2 more

5 metrics

Planned sale 147,208 common shares Shares associated with RSU vesting

Aggregate market value $290,267.53 Securities to be sold

Approximate sale date October 29, 2026 Planned sale

Recent shares sold 165,625 common shares Sale dated September 16, 2026

Recent sale proceeds $687,343 Sale dated September 16, 2026

Key Terms

RSU Vesting, estimated tax withholding obligations, Rule 144

3 terms

RSU Vesting financial

"Common | 10/29/2026 | RSU Vesting"

RSU vesting is the process by which restricted stock units — a promise by a company to give shares to an employee — become actual, owned shares over time or when certain goals are met. Investors care because vested shares can dilute existing ownership when issued, and the timing of vesting affects when employees can sell shares, which can influence share supply, insider selling patterns, and company incentives.

estimated tax withholding obligations financial

"cover estimated tax withholding obligations from the vesting"

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.

FAQ

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

How many EOSE shares is Nathan Kroeker planning to sell?

The notice lists 147,208 common shares for sale, with an approximate sale date of October 29, 2026.

How many EOSE shares did Nathan Kroeker sell in the prior three months?

The notice lists a sale of 165,625 common shares dated September 16, 2026, for $687,343.

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	0001613718
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	Nathan Kroeker
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	147208	290267.53	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	10/29/2026	RSU Vesting	Issuer			147208	10/29/2026	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
Nathan Kroeker Two Allegheny Center, Nova Tower 2 Pittsburgh PA 15212	Common	09/16/2026	165625	687343

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	10/29/2026
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/JOSEPH CASSIDY, for UBS Financial Services Inc, as attorney-in-fact for Nathan Kroeker
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)