Form 4 for ASPN ASPEN AEROGELS INC

Accepted 2026-09-24 20:59:30 ET · period of report 2026-09-23 · accession 0001193125-26-401380 · 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
	2026-09-24 20:59	2026-09-23	ASPN	Wood River Capital, LLC	Former 10% Owner	S - Sale	$4.73	-12.28M	0	-100%	-$58.09M

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	2026-09-23	S	D	12,280,426	$4.73	0	D	—	—	(F1) The sale was executed in a single block trade at $4.73 per share. (F2) Wood River is beneficially owned by SCC Holdings, LLC ("SCC"), SCC is beneficially owned by KIM, LLC ("KIM"), KIM is beneficially owned by Koch Investments Group, LLC ("KIG"), KIG is beneficially owned by Koch Investments Group Holdings, LLC ("KIGH"), and KIGH is beneficially owned by Koch Industries, Inc. ("Koch Industries"), in each case by means of ownership of all voting equity instruments. Koch Industries, SCC, KIM, KIG, and KIGH may be deemed to beneficially own the shares of the Issuer's common stock beneficially owned by Wood River by virtue of (i) Koch Industries' beneficial ownership of KIGH, (ii) KIGH's beneficial ownership of KIG, (iii) KIG's beneficial ownership of KIM, (iv) KIM's beneficial ownership of SCC and (v) SCC's beneficial ownership of Wood River.