Key facts
- This page summarizes Russell Monoki Stidolph's Form 4 filing for Eos Energy Enterprises, Inc. (EOSE).
- 17 reported transactions and 3 derivative rows are listed below.
- Accepted by SEC: 08 Dec 2025, 21:13.
Russell Monoki Stidolph - 05 Dec 2025 Form 4 Insider Report for Eos Energy Enterprises, Inc. (EOSE)
- Reporting relationship
- Director
- Issuer ticker
- EOSE
- Reported as of
- 05 Dec 2025
- Net transaction value
- -$11,471,730
- SEC form
- 4
- Accepted by SEC
- 08 Dec 2025, 21:13:07 UTC
- Prior SEC filing
- 21 May 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Michael Silberman as attorney-in-fact for Russell Stidolph
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Russell Monoki Stidolph filed Form 4 for Eos Energy Enterprises, Inc. (EOSE) on 08 Dec 2025.
Change
- Previous filing in this sequence was filed on 21 May 2025.
- Current net transaction value: -$11,471,730.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001833275
Primary reporting owner
Stidolph Russell Monoki
- Relationship
- Director
- Address
- C/O ALTENERGY LLC, 137 ROWAYTON AVENUE, ROWAYTON
- Signature
- /s/ Michael Silberman as attorney-in-fact for Russell Stidolph
- Signature date
- 08 Dec 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
EOSE
transaction
Common Stock
Sale
- Transaction value
- $7,495,000
- Shares
- -500,000
- Change %
- -19%
- Price
- $14.99
- Shares after
- 2,153,272
- Date
- 05 Dec 2025
- Ownership
- See footnote
- Footnotes
- F1
EOSE
transaction
Common Stock
Sale
- Transaction value
- $460,785
- Shares
- -29,999
- Change %
- -1.4%
- Price
- $15.36
- Shares after
- 2,123,273
- Date
- 08 Dec 2025
- Ownership
- See footnote
- Footnotes
- F1, F2
EOSE
transaction
Common Stock
Other
- Transaction value
- $0
- Shares
- -75,000
- Change %
- -3.5%
- Price
- $0.000000
- Shares after
- 2,048,273
- Date
- 05 Dec 2025
- Ownership
- See footnote
- Footnotes
- F1, F3
EOSE
transaction
Common Stock
Other
- Transaction value
- $0
- Shares
- +75,000
- Change %
- +21%
- Price
- $0.000000
- Shares after
- 439,355
- Date
- 05 Dec 2025
- Ownership
- Direct
- Footnotes
- F3
EOSE
transaction
Common Stock
Gift
- Transaction value
- $0
- Shares
- -60,000
- Change %
- -14%
- Price
- $0.000000
- Shares after
- 379,355
- Date
- 05 Dec 2025
- Ownership
- Direct
- Footnotes
- F4
EOSE
transaction
Common Stock
Gift
- Transaction value
- $0
- Shares
- -15,000
- Change %
- -4%
- Price
- $0.000000
- Shares after
- 364,355
- Date
- 05 Dec 2025
- Ownership
- Direct
- Footnotes
- F5
EOSE
transaction
Common Stock
Options Exercise
- Transaction value
- $444,271
- Shares
- +30,788
- Change %
- +8.5%
- Price
- $14.43
- Shares after
- 395,143
- Date
- 08 Dec 2025
- Ownership
- Direct
EOSE
transaction
Common Stock
Tax liability
- Transaction value
- $444,296
- Shares
- -30,020
- Change %
- -7.6%
- Price
- $14.80
- Shares after
- 365,123
- Date
- 08 Dec 2025
- Ownership
- Direct
EOSE
transaction
Common Stock
Sale
- Transaction value
- $11,366
- Shares
- -768
- Change %
- -0.21%
- Price
- $14.80
- Shares after
- 364,355
- Date
- 08 Dec 2025
- Ownership
- Direct
EOSE
transaction
Common Stock
Options Exercise
- Transaction value
- $171,121
- Shares
- +145,018
- Change %
- +40%
- Price
- $1.18
- Shares after
- 509,373
- Date
- 08 Dec 2025
- Ownership
- Direct
EOSE
transaction
Common Stock
Options Exercise
- Transaction value
- $279,869
- Shares
- +120,633
- Change %
- +24%
- Price
- $2.32
- Shares after
- 630,006
- Date
- 08 Dec 2025
- Ownership
- Direct
EOSE
transaction
Common Stock
Tax liability
- Transaction value
- $279,828
- Shares
- -18,793
- Change %
- -3%
- Price
- $14.89
- Shares after
- 611,213
- Date
- 08 Dec 2025
- Ownership
- Direct
- Footnotes
- F6
EOSE
transaction
Common Stock
Tax liability
- Transaction value
- $171,101
- Shares
- -11,491
- Change %
- -1.9%
- Price
- $14.89
- Shares after
- 599,722
- Date
- 08 Dec 2025
- Ownership
- Direct
- Footnotes
- F6
EOSE
transaction
Common Stock
Sale
- Transaction value
- $3,504,615
- Shares
- -235,367
- Change %
- -39%
- Price
- $14.89
- Shares after
- 364,355
- Date
- 08 Dec 2025
- Ownership
- Direct
- Footnotes
- F6
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
- $0
- Shares
- -30,788
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 08 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 30,788
- Exercise price
- $14.43
- Footnotes
- F7
EOSE
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -145,018
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 08 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 145,018
- Exercise price
- $1.18
- Footnotes
- F8
EOSE
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -120,633
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 08 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 120,633
- Exercise price
- $2.32
- Footnotes
- F9
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 9 footnotes
Footnote F1
The shares reported in this Form 4 are shares of common stock in which Mr. Stidolph has a pecuniary interest in that are held directly by AltEnergy, LLC or AltEnergy Transmission, LLC. Mr. Stidolph is the managing director of AltEnergy, LLC and the managing member of AltEnergy Transmission, LLC and has voting and dispositive power with respect to the securities owned by AltEnergy, LLC and AltEnergy Transmission, LLC. Each of the Filing Persons disclaims beneficial ownership of the outstanding shares of common stock of the issuer reported herein except to the extent of its pecuniary interest therein.
Footnote F2
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $15.45, inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
Footnote F3
Represents the receipt, for no consideration, of an aggregate of 75,000 shares of Common Stock of the Issuer by AltEnergy pursuant to pro rata distribution by AltEnergy.
Footnote F4
Represents a charitable donation by the reporting person.
Footnote F5
Reflects the donation of common stock to a charitable donor advised fund.
Footnote F6
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions pursuant to a Cashless exercise / same-day sale at prices ranging from $14.68 to $15.16, inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
Footnote F7
On December 8, 2020 the reporting person was granted stock options to purchase 30,788 shares of common stock which vested on June 15, 2021.
Footnote F8
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.
Footnote F9
On May 18, 2023 the reporting person was granted stock options to purchase 120,633 shares of common stock which vested on April 30, 2024.