Joe Mastrangelo - 12 Jun 2026 Form 4 Insider Report for Eos Energy Enterprises, Inc. (EOSE)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: EOSE
Reported as of: 12 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 Jun 2026, 09:15:32 UTC
Prior SEC filing: 05 Mar 2026
Next SEC filing: 30 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael Silberman as attorney-in-fact for Joe Mastrangelo

Key filing fact

Joe Mastrangelo filed Form 4 for Eos Energy Enterprises, Inc. (EOSE) on 15 Jun 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: 15 Jun 2026, 09:15.

Change

Previous filing in this sequence was filed on 05 Mar 2026.
Current net transaction value: $0.

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., 3920 PARK AVENUE, EDISON
Signature: /s/ Michael Silberman as attorney-in-fact for Joe Mastrangelo
Signature date: 15 Jun 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: +200,000
Change %: +13%
Price: $1.34^*
Shares after: 1,687,126
Date: 12 Jun 2026
Ownership: Direct

EOSE transaction

Common Stock

Tax liability

Transaction value
Shares: -116,646
Change %: -6.9%
Price: $6.06^*
Shares after: 1,570,480
Date: 12 Jun 2026
Ownership: Direct
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: -200,000
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 12 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 200,000
Exercise price: $1.34
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

The transactions reported in this Form 4 reflect the exercise of Non-Qualified Stock Options by the Reporting Person and the subsequent retention of the underlying shares of Common Stock. The option exercise and corresponding acquisition of shares reported in Table I and Table II were exempted from Section 16(b) liability pursuant to Rule 16b-3 promulgated under the Securities Exchange Act of 1934. The Reporting Person has elected to retain the net shares acquired upon exercise to maintain and support their long-term equity position in the Issuer, including in connection with any potential future equity or rights offerings that may be conducted by the Issuer.

Footnote F2

On June 16, 2022 the reporting person was granted stock options to purchase 200,000 shares of common stock which vested on September 27, 2022.