Sumeet Puri - 14 Sep 2026 Form 4 Insider Report for Eos Energy Enterprises, Inc. (EOSE)

Reporting relationship: Chief Accounting Officer
Issuer ticker: EOSE
Reported as of: 14 Sep 2026
Net transaction value: -$171,500
SEC form: 4
Accepted by SEC: 16 Sep 2026, 16:28:27 UTC
Prior SEC filing: 09 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Sumeet Puri

Key filing fact

Sumeet Puri filed Form 4 for Eos Energy Enterprises, Inc. (EOSE) on 16 Sep 2026.

Key facts

This page summarizes Sumeet Puri's Form 4 filing for Eos Energy Enterprises, Inc. (EOSE).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 16 Sep 2026, 16:28.

Change

Previous filing in this sequence was filed on 09 Sep 2026.
Current net transaction value: -$171,500.

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 0001991521 Primary reporting owner

Puri Sumeet

Relationship: Chief Accounting Officer
Address: C/O EOS ENERGY ENTERPRISES, INC., TWO ALLEGHENY CENTER, NOVA TOWER 2, PITTSBURGH
Signature: /s/ Sumeet Puri
Signature date: 16 Sep 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: +87,500
Change %: +37%
Price: $0.000000^*
Shares after: 323,945
Date: 14 Sep 2026
Ownership: Direct
Footnotes: F1

EOSE transaction

Common Stock

Sale

Transaction value: $171,500
Shares: -43,750
Change %: -14%
Price: $3.92
Shares after: 280,195
Date: 16 Sep 2026
Ownership: Direct
Footnotes: F2, F3

Reported derivative securities

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

EOSE transaction Derivative

Performance-Based Restricted Stock Units

Options Exercise

Transaction value
Shares: -87,500
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 14 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 87,500
Exercise price
Footnotes: F1, F4, F5

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 5 footnotes

Footnote F1

On July 5, 2024, the Reporting Person was granted performance-based restricted stock units ("2024 PRSU Awards"). The 2024 PRSU Awards are eligible to vest in up to two installments based on the total shareholder return of the Issuer over two- and three-year performance periods, each commencing on July 5, 2024. On September 14, 2026, the Compensation Committee of the Issuer's Board of Directors certified the achievement of the first performance period, resulting in the vesting of these shares.

Footnote F2

The sales reported in this Form 4 were effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 15, 2025 to cover estimated tax withholding obligations in connection with the vesting of performance-based restricted stock units.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.85 to $4.16, 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 F4

Represents the outstanding awarded and vested units pursuant to the 2024 PRSU Awards dated July 25, 2024 related to the achievement of certain total shareholder return objectives.

Footnote F5

Not applicable.