Gagnon Securities’s Aspen Aerogels ASPN Stock Holding History

Gagnon Securities’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
2026 Q2	$9.74M	Sell	1,535,812 -326,039	-18%	-$1.6M	1.88%	22
2026 Q1	$6.37M	Buy	1,861,851 +728,603	+64%	+$2.46M	1.47%	23
2025 Q4	$3.21M	Sell	1,133,248 -621,585	-35%	-$3.21M	0.65%	38
2025 Q3	$12.2M	Sell	1,754,833 -144,275	-8%	-$1.02M	2.45%	16
2025 Q2	$11.2M	Buy	+1,899,108	New	+$10.9M	2.28%	17
2018 Q4	–	Sell	-39,240	Closed	-$179K	–	96
2018 Q3	$179K	Sell	39,240 -109	-0.3%	-$531	0.04%	96
2018 Q2	$193K	Sell	39,349 -369	-0.9%	-$1.75K	0.06%	92
2018 Q1	$170K	Buy	+39,718	New	+$188K	0.06%	85

Other funds holding ASPN

KIM LLC Wichita, Kansas $1B AUM 29.68% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

OCMI

Oaktop Capital Management II Chatham, New Jersey $2.35B AUM 214.39% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

NIM

Needham Investment Management New York $3.33B AUM 163.16% 1-Year Est. Return

GKFF

George Kaiser Family Foundation Tulsa, Oklahoma $1.04B AUM 36.93% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

Jacobs Levy Equity Management Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return

Ameriprise Minneapolis, Minnesota $495B AUM 43.24% 1-Year Est. Return

Gagnon Securities's ASPN Position: Q2 2026 in Review

Gagnon Securities reduced its Aspen Aerogels (ASPN) stake by 18% in Q2 2026, selling an estimated $1.6M and leaving 1,535,812 shares worth $9.74M. The position accounts for 1.88% of the portfolio, ranked #22.

Gagnon Securities first reported a position in ASPN in Q1 2018 and has held it in 8 quarters since. The position peaked at $12.2M in Q3 2025. 180 funds tracked by Wall St. Rank hold ASPN as of Q2 2026.

Gagnon Securities held 1,535,812 shares of Aspen Aerogels worth $9.74M as of Q2 2026.
Gagnon Securities sold 326,039 Aspen Aerogels shares in Q2 2026, an estimated $1.6M.
Aspen Aerogels made up 1.88% of Gagnon Securities's portfolio in Q2 2026, its #22 holding.
Gagnon Securities first reported a position in Aspen Aerogels in Q1 2018 and has held it in 8 quarters since.
Gagnon Securities's Aspen Aerogels position peaked at $12.2M in Q3 2025.
180 funds tracked by Wall St. Rank held Aspen Aerogels as of Q2 2026.

Based on Gagnon Securities's 13F filing for Q2 2026, filed 5 Aug 2026.