SEC Form 4 · accession 0001628280-26-053910

Eos Energy Enterprises, Inc. · EOSE

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

Reporting owner

Director

Period of report

Jul 21, 2026

Accepted (ET)

Aug 6, 2026 · 8:12 am EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0001805077

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock	Jul 21, 2026	M	17,897	$5.48	A	269,296	D
Common Stock	Jul 21, 2026	M	1,377	$5.48	A	11,377	I	By Spouse

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Subscription Rights (right to buy)^F1	$5.48	Jul 21, 2026	M	17,897	D	—	Jul 21, 2026	Common Stock	17,897	0	D
Subscription Rights (right to buy)^F1	$5.48	Jul 21, 2026	M	1,377	D	—	Jul 21, 2026	Common Stock	1,377	0	I
Warrant (right to buy)^F1,F2	$5.48	Jul 21, 2026	M	7,853	A	—	—	Common Stock	7,853	7,853	D
Warrant (right to buy)^F1,F2	$5.48	Jul 21, 2026	M	603	A	—	—	Common Stock	603	603	I

F1Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the "Rights Offering"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share.
F2Warrants became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed earlier. If a warrant is not exercised or redeemed before it expires, it will have no value.