Hartree Partners’s Aspen Aerogels ASPN Stock Holding History

Hartree Partners’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 Q3	–	Sell	-150,000	Closed	-$888K	–	83
2025 Q2	$888K	Hold	150,000	–	–	0.25%	36
2025 Q1	$959K	Buy	+150,000	New	+$1.45M	0.34%	34
2024 Q1	–	Sell	-75,001	Closed	-$1.18M	–	60
2023 Q4	$1.18M	Sell	75,001 -125,000	-62%	-$1.29M	0.43%	35
2023 Q3	$1.72M	Buy	200,001 +90,001	+82%	+$639K	0.69%	24
2023 Q2	$868K	Buy	+110,000	New	+$765K	0.43%	24

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

GKFF

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

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

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

TAM

Telemark Asset Management Boston, Massachusetts $1.08B AUM 70.88% 1-Year Est. Return

Gagnon Securities New York $433M AUM 29.08% 1-Year Est. Return

Hartree Partners's ASPN Position: Q3 2025 in Review

Hartree Partners sold out of Aspen Aerogels (ASPN) in Q3 2025, closing a stake of 150,000 shares — an estimated $888K sold.

Hartree Partners first reported a position in ASPN in Q2 2023 and held it in 5 quarters. The position peaked at $1.72M in Q3 2023. 204 funds tracked by Wall St. Rank hold ASPN as of Q3 2025.

Hartree Partners reported no remaining Aspen Aerogels position as of Q3 2025 after selling out during the quarter.
Hartree Partners sold 150,000 Aspen Aerogels shares in Q3 2025, an estimated $888K.
Hartree Partners first reported a position in Aspen Aerogels in Q2 2023 and held it in 5 quarters.
Hartree Partners's Aspen Aerogels position peaked at $1.72M in Q3 2023.
204 funds tracked by Wall St. Rank held Aspen Aerogels as of Q3 2025.

Based on Hartree Partners's 13F filing for Q3 2025, filed 13 Nov 2025.