Form 4 for EOSE Eos Energy Enterprises, Inc.

Accepted 2026-07-07 17:18:20 ET · period of report 2026-07-05 · accession 0001628280-26-047541 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-07-07 17:18	2026-07-05	EOSE	Mastrangelo Joe	CEO, Dir	M - OptEx	$0.00	+254.3K	1.89M	+16%	$0
D	2026-07-07 17:18	2026-07-06	EOSE	Mastrangelo Joe	CEO, Dir	F - Tax	$5.06	-121.2K	1.77M	-6%	-$613.5K
D	2026-07-07 17:18	2026-07-05	EOSE	Mastrangelo Joe	CEO, Dir	M - OptEx	$0.00	-254.3K	0	-100%	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-07-05	M	A	254,304	$0.00	1,894,651	D	—	—	(F1) Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock.
2	Common	Common Stock	2026-07-06	F	D	121,245	$5.06	1,773,406	D	—	—	(F2) Represents shares withheld from vested restricted stock unit ("RSU") award to satisfy tax obligations, as permitted by the Company's Amended and Restated 2020 Incentive Plan.
3	Derivative	Restricted Stock Units	2026-07-05	M	D	254,304	$0.00	0	D	— · — to —	254,304 Common Stock	(F3) The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three equal installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date. (F1) Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock. (F4) Not applicable. (F4) Not applicable.