SEC Form 4 · accession 0001628280-26-050227

Eos Energy Enterprises, Inc. · EOSE

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Officer — Chief Commercial Officer

Period of report

Jul 25, 2026

Accepted (ET)

Jul 28, 2026 · 5:02 pm EDT

Rule 10b5-1 plan

yes — trade under a plan

Issuer CIK

0001805077

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1	Jul 25, 2026	M	220,834	$0.00	A	997,944	D
Common Stock^F3	Jul 28, 2026	S	110,417	$3.36	D	887,527	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Restricted Stock Units^F4,F1,F5	—	Jul 25, 2026	M	220,834	D	—	—	Common Stock	220,834	220,833	D

F1Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.
F2The 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 restricted stock units.
F3The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.23 to $3.48, 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.
F4The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date.
F5Not applicable.