Gagnon Advisors’s Aspen Aerogels ASPN Stock Holding History

Gagnon Advisors’s Portfolio ASPN Stock Details ASPN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	–	Sell	-565,570	Closed	-$3.94M	–	24
2025 Q3	$3.94M	Hold	565,570	–	–	2.43%	17
2025 Q2	$3.35M	Buy	+565,570	New	+$3.25M	2.25%	20

Other funds holding ASPN

KIM LLC Wichita, Kansas $976M AUM 0.91% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

OCMI

Oaktop Capital Management II Chatham, New Jersey $1.34B AUM 114.5% 1-Year Est. Return

NIM

Needham Investment Management New York $1.96B AUM 101.23% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

GKFF

George Kaiser Family Foundation Tulsa, Oklahoma $883M AUM 21.04% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Gagnon Advisors's ASPN Position: Q4 2025 in Review

Gagnon Advisors sold out of Aspen Aerogels (ASPN) in Q4 2025, closing a stake of 565,570 shares — an estimated $3.94M sold.

Gagnon Advisors first reported a position in ASPN in Q2 2025 and held it in 2 quarters. The position peaked at $3.94M in Q3 2025. 183 funds tracked by Wall St. Rank hold ASPN as of Q4 2025.

Gagnon Advisors reported no remaining Aspen Aerogels position as of Q4 2025 after selling out during the quarter.
Gagnon Advisors sold 565,570 Aspen Aerogels shares in Q4 2025, an estimated $3.94M.
Gagnon Advisors first reported a position in Aspen Aerogels in Q2 2025 and held it in 2 quarters.
Gagnon Advisors's Aspen Aerogels position peaked at $3.94M in Q3 2025.
183 funds tracked by Wall St. Rank held Aspen Aerogels as of Q4 2025.

Based on Gagnon Advisors's 13F filing for Q4 2025, filed 13 Feb 2026.