Eos Energy former officer plans sale of 165,625 shares

Former officer Nathan Kroeker filed a Rule 144 notice to sell EOSE shares tied to RSU vesting under a Rule 10b5-1 trading plan.

Available on EDGAR 09/16/2026 - 04:08 PM EDT Accepted by SEC EDGAR 09/16/2026 - 04:07 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Eos Energy Enterprises, Inc. (EOSE) is the issuer of common stock that former officer Nathan Kroeker plans to sell under Rule 144. A notice covers the proposed sale of 165,625 shares of common stock through UBS Financial Services Inc., with sales to be made on NASDAQ.

The shares relate to RSU vesting on September 14, 2026 and are to be sold pursuant to a Rule 10b5-1 trading plan adopted by Kroeker to cover estimated tax withholding obligations from the vesting of restricted stock units. The notice also lists several earlier common stock sales by Kroeker during the prior three months.

Key Figures

Planned shares to be sold: 165,625 shares Aggregate market value of planned sale: $687,343.75 Shares outstanding: 364,167,744 shares +6 more

9 metrics

Planned shares to be sold 165,625 shares Common stock planned for sale under Rule 144 related to RSU vesting

Aggregate market value of planned sale $687,343.75 Value of 165,625 shares of common stock in the securities information section

Shares outstanding 364,167,744 shares Common shares outstanding referenced in the Rule 144 notice

Shares sold June 30, 2026 35,289 shares Common stock sale by Nathan Kroeker during the past 3 months

Proceeds June 30, 2026 sale $206,673.56 Value of 35,289 shares sold by Nathan Kroeker

Shares sold July 7, 2026 79,309 shares Common stock sale by Nathan Kroeker during the past 3 months

Proceeds July 7, 2026 sale $371,324.74 Value of 79,309 shares sold by Nathan Kroeker

Shares sold July 28, 2026 110,417 shares Common stock sale by Nathan Kroeker during the past 3 months

Proceeds July 28, 2026 sale $370,758.20 Value of 110,417 shares sold by Nathan Kroeker

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

"shares reported on this will be sold 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.

tax withholding obligations financial

"to cover estimated tax withholding obligations from the vesting of restricted stock units."

FAQ

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

What does the Form 144 filing report for EOSE?

The filing reports that former officer Nathan Kroeker intends to sell 165,625 shares of Eos Energy Enterprises, Inc. common stock under Rule 144, with sales to be executed through UBS Financial Services Inc. on NASDAQ.

Why is Nathan Kroeker selling EOSE shares according to the Form 144?

The notice states the shares will be sold pursuant to a Rule 10b5-1 trading plan adopted by Nathan Kroeker "to cover estimated tax withholding obligations from the vesting of restricted stock units."

How many EOSE shares are planned to be sold and what is their value?

The Form 144 lists 165,625 shares of Eos Energy Enterprises common stock to be sold, with an aggregate market value of $687,343.75 as shown in the securities information section.

What RSU event is associated with the planned EOSE share sale?

The securities to be sold are tied to RSU vesting dated September 14, 2026, with the issuer identified as Eos Energy Enterprises, Inc. and the transaction reason described as “RSU Vesting.”

What EOSE share sales has Nathan Kroeker reported in the past three months?

The notice lists prior common stock sales by Nathan Kroeker of 35,289 shares on June 30, 2026 for $206,673.56, 79,309 shares on July 7, 2026 for $371,324.74, and 110,417 shares on July 28, 2026 for $370,758.20.

How many EOSE shares are shown as outstanding in the Form 144?

The securities information section lists 364,167,744 shares of Eos Energy Enterprises common stock outstanding, in the context of the Rule 144 notice for the planned sale.

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	(732) 225-8400
Name of Person for Whose Account the Securities are To Be Sold	Kroeker Nathan
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 Avenue 4th Floor New York NY 10010	165625	687343.75	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			165625	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
Nathan Kroeker TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PA 15212	Common	06/30/2026	35289	206673.56
Nathan Kroeker TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PA 15212	Common	07/07/2026	79309	371324.74
Nathan Kroeker TWO ALLEGHENY CENTER NOVA TOWER 2 PITTSBURGH PA 15212	Common	07/28/2026	110417	370758.20

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 Nathan Kroeker
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)