CastleKnight Management’s Aspen Aerogels ASPN Stock Holding History

CastleKnight Management’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	-162,599	Closed	-$1.13M	–	359
2025 Q3	$1.13M	Sell	162,599 -192,800	-54%	-$1.36M	0.02%	308
2025 Q2	$2.1M	Hold	355,399	–	–	0.06%	203
2025 Q1	$2.27M	Sell	355,399 -90,200	-20%	-$870K	0.09%	141
2024 Q4	$5.29M	Buy	+445,599	New	+$7.6M	0.15%	82
2024 Q1	–	Sell	-105,400	Closed	-$1.66M	–	339
2023 Q4	$1.66M	Sell	105,400 -204,800	-66%	-$2.11M	0.09%	127
2023 Q3	$2.67M	Hold	310,200	–	–	0.18%	85
2023 Q2	$2.45M	Sell	310,200 -41,400	-12%	-$288K	0.26%	67
2023 Q1	$2.62M	Buy	351,600 +108,700	+45%	+$1.08M	0.27%	60
2022 Q4	$2.86M	Buy	+242,900	New	+$2.78M	0.38%	37

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

CastleKnight Management's ASPN Position: Q4 2025 in Review

CastleKnight Management sold out of Aspen Aerogels (ASPN) in Q4 2025, closing a stake of 162,599 shares — an estimated $1.13M sold.

CastleKnight Management first reported a position in ASPN in Q4 2022 and held it in 9 quarters. The position peaked at $5.29M in Q4 2024. 183 funds tracked by Wall St. Rank hold ASPN as of Q4 2025.

CastleKnight Management reported no remaining Aspen Aerogels position as of Q4 2025 after selling out during the quarter.
CastleKnight Management sold 162,599 Aspen Aerogels shares in Q4 2025, an estimated $1.13M.
CastleKnight Management first reported a position in Aspen Aerogels in Q4 2022 and held it in 9 quarters.
CastleKnight Management's Aspen Aerogels position peaked at $5.29M in Q4 2024.
183 funds tracked by Wall St. Rank held Aspen Aerogels as of Q4 2025.

Based on CastleKnight Management's 13F filing for Q4 2025, filed 17 Feb 2026.