Joe Mastrangelo - 25 Jul 2026 Form 4 Insider Report for Eos Energy Enterprises, Inc. (EOSE)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: EOSE
Reported as of: 25 Jul 2026
Net transaction value: -$574,546
SEC form: 4
Accepted by SEC: 28 Jul 2026, 17:02:00 UTC
Prior SEC filing: 06 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Sumeet Puri as attorney-in-fact for Joe Mastrangelo

Key filing fact

Joe Mastrangelo filed Form 4 for Eos Energy Enterprises, Inc. (EOSE) on 28 Jul 2026.

Key facts

This page summarizes Joe Mastrangelo's Form 4 filing for Eos Energy Enterprises, Inc. (EOSE).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 28 Jul 2026, 17:02.

Change

Previous filing in this sequence was filed on 06 Aug 2026.
Current net transaction value: -$574,546.

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 0001833309 Primary reporting owner

Mastrangelo Joe

Relationship: Chief Executive Officer, Director
Address: C/O EOS ENERGY ENTERPRISES, INC., TWO ALLEGHENY CENTER, NOVA TOWER 2, PITTSBURGH
Signature: /s/ Sumeet Puri as attorney-in-fact for Joe Mastrangelo
Signature date: 28 Jul 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: +333,334
Change %: +19%
Price: $0.000000^*
Shares after: 2,106,740
Date: 25 Jul 2026
Ownership: Direct
Footnotes: F1

EOSE transaction

Common Stock

Sale

Transaction value: $574,546
Shares: -159,154
Change %: -7.6%
Price: $3.61
Shares after: 1,947,586
Date: 27 Jul 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

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

EOSE transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -333,334
Change %: -50%
Price: $0.000000^*
Shares after: 333,333
Date: 25 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 333,334
Exercise price
Footnotes: F1, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.

Footnote F2

Represents shares withheld from vested restricted stock unit ("RSU") award to satisfy tax obligations, as permitted by the Company's Amended and Restated 2020 Incentive Plan.

Footnote F3

Not applicable.