STOCK TITAN

Eos Energy (EOSE) director Walters sells 30K shares after option exercise

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Eos Energy Enterprises director Marian Walters exercised stock options and sold shares in a paired transaction. Walters exercised options to acquire 30,000 shares of common stock at $1.18 per share and on the same date sold 30,000 shares at $9.18 per share in an open-market sale. Following these moves, Walters directly holds 158,445 common shares and 35,018 stock options, and is also shown with indirect ownership of 5,000 shares held by the D. and M. Walters Family Trust.

Positive

  • None.

Negative

  • None.
Insider Walters Marian
Role null
Sold 30,000 shs ($275K)
Type Security Shares Price Value
Exercise Stock Option (Right to Buy) 30,000 $0.00 --
Exercise Common Stock 30,000 $1.18 $35K
Sale Common Stock 30,000 $9.18 $275K
holding Common Stock -- -- --
Holdings After Transaction: Stock Option (Right to Buy) — 35,018 shares (Direct, null); Common Stock — 188,445 shares (Direct, null); Common Stock — 5,000 shares (Indirect, See footnote)
Footnotes (1)
  1. Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020 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.
Shares sold 30,000 shares Open-market sale of common stock at $9.18 on May 28, 2026
Sale price $9.18/share Price for 30,000 Eos Energy common shares sold
Options exercised 30,000 shares Stock options exercised into common stock on May 28, 2026
Exercise price $1.18/share Exercise price of stock options converted into 30,000 shares
Direct shares after 158,445 shares Direct Eos Energy common stock holdings following transactions
Options remaining 35,018 options Stock options outstanding after current 30,000-share exercise
Original option grant 145,018 options Grant from May 19, 2022 that vested May 19, 2023
Indirect trust shares 5,000 shares Held by D. and M. Walters Family Trust dated July 6, 2020
open-market sale financial
"transaction_action": "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
Stock Option (Right to Buy) financial
"security_title": "Stock Option (Right to Buy)""
derivative security financial
"transaction_code_description": "Exercise or conversion of derivative security""
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
indirect ownership financial
"ownership_type": "indirect""
trustees financial
"held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust"
Trustees are people or a small group legally appointed to hold and manage assets, documents, or obligations on behalf of others and must act in those beneficiaries’ best interests. Think of them as a neutral guardian or custodian who enforces rules, protects assets, and makes decisions that can affect payments, corporate governance, or recovery in a default — all of which directly influence investor returns and risk.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Walters Marian

(Last)(First)(Middle)
C/O EOS ENERGY ENTERPRISES, INC.
3920 PARK AVENUE

(Street)
EDISON NEW JERSEY 08820

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Eos Energy Enterprises, Inc. [ EOSE ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/28/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock05/28/2026M30,000A$1.18188,445D
Common Stock05/28/2026S30,000D$9.18158,445D
Common Stock5,000ISee footnote(1)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy)$1.1805/28/2026M30,000 (2)05/19/2027Common Stock30,000$035,018D
Explanation of Responses:
1. Shares of records held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dtd 7/6/2020
2. 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.
Remarks:
/s/ Michael Silberman as attorney-in-fact for Marian Walters05/29/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Marian Walters report in EOSE on this Form 4?

Marian Walters reported an option exercise and a share sale. She exercised options for 30,000 Eos Energy Enterprises shares at $1.18 each and sold 30,000 shares at $9.18 per share in an open-market transaction on May 28, 2026.

How many Eos Energy (EOSE) shares does Marian Walters hold after the Form 4 transactions?

After the reported transactions, Marian Walters directly holds 158,445 Eos Energy common shares. In addition, the filing shows indirect ownership of 5,000 shares held by the D. and M. Walters Family Trust, where David and Marian Walters serve as trustees.

What stock options did Marian Walters exercise in this EOSE Form 4?

Walters exercised stock options to purchase 30,000 Eos Energy common shares at a $1.18 exercise price. These options were part of a larger 145,018-share grant from May 19, 2022 that fully vested on May 19, 2023, according to the footnote.

How many Eos Energy (EOSE) stock options does Marian Walters still hold?

Following the exercise of 30,000 options, Walters holds 35,018 stock options in Eos Energy. A footnote explains the original grant totaled 145,018 options and that 80,000 had been exercised previously on several dates before this filing.

Was the 30,000-share Eos Energy transaction an open-market sale?

Yes. The Form 4 classifies the 30,000-share transaction as an open-market sale under transaction code "S." The reported sale price was $9.18 per share, and the sale reduced Walters’ direct common stock position from 188,445 to 158,445 shares.

What indirect Eos Energy (EOSE) holdings are disclosed for Marian Walters?

The filing shows 5,000 Eos Energy common shares as indirectly owned. A footnote states these are "shares of record" held by David Walters and Marian Walters as trustees of the D. and M. Walters Family Trust dated July 6, 2020.