Changes in Beneficial Ownership · 4
Eos Energy Enterprises, Inc.
EOSENASDAQEQUITYCurrent
Changes in Beneficial Ownership
Structured filing — 4
wk-form4_1789590447.xml
Filing details
- Report period
- 2026-09-14
- Issuer
- Eos Energy Enterprises, Inc.
- Issuer CIK
- 0001805077
- Trading symbol
- EOSE
- Rule 10b5-1 indication
- Checked
Reporting owner 1
- Name
- Mastrangelo Joe
- Reporting owner CIK
- 0001833309
- Relationship
- Director · Officer
- Officer title
- Chief Executive Officer
- Address
- C/O EOS ENERGY ENTERPRISES, INC., TWO ALLEGHENY CENTER, NOVA TOWER 2, PITTSBURGH, PA, 15212
Non-derivative transactions
| Security | Transaction date | Code | Amount | A / D | Price (USD) | Owned after | Ownership |
|---|---|---|---|---|---|---|---|
| Common Stock | 2026-09-14 | A · Form 4 | 500,000 | A | 0[F1] | 2,558,704 | D |
| Common Stock | 2026-09-16 | S · Form 4[F2] | 250,000 | D | 3.92[F3] | 2,308,704 | D |
Table key
- A · Form 4
- Acquisition by grant, award or otherwise under Rule 16b-3(d)
- A
- Acquired
- D
- Direct
- S · Form 4
- Sale on the market or privately
Derivative transactions
| Security | Conversion / exercise price (USD) | Transaction date | Code | Amount | A / D | Price (USD) | Exercisable | Expires | Underlying security | Underlying shares | Owned after | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Performance-Based Restricted Stock Units[F1] | [F1] | 2026-09-14 | M · Form 4 | 500,000[F4] | D | 0 | [F5] | [F5] | Common Stock | 500,000 | 0 | D |
Table key
- M · Form 4
- Exempt derivative exercise or conversion under Rule 16b-3
- D
- Direct
Footnotes
- 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.↩ 1↩ 2↩ 3
- 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.↩ 1
- F3
- The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.84 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.↩ 1
- 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.↩ 1
Signature 1
- Signed
- /s/ Sumeet Puri as attorney-in-fact for Joe Mastrangelo
- Date
- 2026-09-16
Company context
Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional lithium-ion technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.
Current securities
Historical securities (5)
Recent company filings
- 144 filingOct 29, 2026
- Results of Operations and Financial Condition · Regulation FD Disclosure · Other EventsOct 19, 2026
- Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory ArrangementsSep 16, 2026
- 144 filingSep 16, 2026
- 144 filingSep 16, 2026