Marian Walters - 28 May 2026 Form 4 Insider Report for Eos Energy Enterprises, Inc. (EOSE)

Reporting relationship: Director
Issuer ticker: EOSE
Reported as of: 28 May 2026
Net transaction value: -$275,400
SEC form: 4
Accepted by SEC: 29 May 2026, 16:01:33 UTC
Prior SEC filing: 22 May 2026
Next SEC filing: 03 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael Silberman as attorney-in-fact for Marian Walters

Key filing fact

Marian Walters filed Form 4 for Eos Energy Enterprises, Inc. (EOSE) on 29 May 2026.

Key facts

This page summarizes Marian Walters's Form 4 filing for Eos Energy Enterprises, Inc. (EOSE).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 29 May 2026, 16:01.

Change

Previous filing in this sequence was filed on 22 May 2026.
Current net transaction value: -$275,400.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001782905 Primary reporting owner

Walters Marian

Relationship: Director
Address: C/O EOS ENERGY ENTERPRISES, INC., 3920 PARK AVENUE, EDISON
Signature: /s/ Michael Silberman as attorney-in-fact for Marian Walters
Signature date: 29 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

EOSE transaction

Common Stock

Options Exercise

Transaction value
Shares: +30,000
Change %: +19%
Price: $1.18^*
Shares after: 188,445
Date: 28 May 2026
Ownership: Direct

EOSE transaction

Common Stock

Sale

Transaction value: $275,400
Shares: -30,000
Change %: -16%
Price: $9.18
Shares after: 158,445
Date: 28 May 2026
Ownership: Direct

EOSE holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 5,000
Date: 28 May 2026
Ownership: See footnote
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

EOSE transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -30,000
Change %: -46%
Price: $0.000000^*
Shares after: 35,018
Date: 28 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 30,000
Exercise price: $1.18
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020

Footnote F2

On May 19, 2022 the reporting person was granted stock options to purchase 145,018 shares of common stock which vested on May 19, 2023. 80,000 of these stock options were previously exercised on December 4, 2025, May 19, 2026 and May 20, 2026.