Form 4 for ASPN ASPEN AEROGELS INC

Accepted 2026-03-06 00:00:00 ET · period of report 2026-03-04 · accession 0001193125-26-096816 · 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	2026-03-06	2026-03-04	ASPN	Thoele Grant Douglas	CFO, Treas	A - Grant	$0.00	+55.3K	80.7K	+218%	$0
D	2026-03-06	2026-03-05	ASPN	Thoele Grant Douglas	CFO, Treas	F - Tax	$3.27	-2,368	78.3K	-3%	-$7,743
D	2026-03-06	2026-03-04	ASPN	Thoele Grant Douglas	CFO, Treas	A - Grant	$0.00	+74.9K	74.9K	New	$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	2026-03-04	A	A	55,298	$0.00	80,690	D	—	—	(F1) Each Restricted Stock Unit ("RSU") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029.
2	Common	Common Stock	2026-03-05	F	D	2,368	$3.27	78,322	D	—	—	(F2) Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units ("RSUs"). (F3) Represents 9,014 shares of Common Stock and 69,308 RSUs.
3	Derivative	Stock Options (Right to Buy)	2026-03-04	A	A	74,893	$0.00	74,893	D	$3.35 · — to 2036-03-04	74,893 Common Stock	(F4) The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029.