Citadel Advisors
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Citadel Advisors’s Aspen Aerogels ASPN Stock Holding History

Citadel 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
2026
Q1 		$511K Sell
149,500
-95,100
-39% -$321K ﹤0.01% 9252
2025
Q4 		$692K Buy
244,600
+75,900
+45% +$391K ﹤0.01% 8233
2025
Q3 		$1.17M Buy
168,700
+7,300
+5% +$51.5K ﹤0.01% 7186
2025
Q2 		$955K Sell
161,400
-395,300
-71% -$2.27M ﹤0.01% 7207
2025
Q1 		$3.56M Buy
556,700
+5,800
+1% +$55.9K ﹤0.01% 4467
2024
Q4 		$6.54M Buy
550,900
+356,300
+183% +$6.07M ﹤0.01% 3541
2024
Q3 		$5.39M Sell
194,600
-132,400
-40% -$3.31M ﹤0.01% 3818
2024
Q2 		$7.8M Buy
327,000
+80,900
+33% +$1.9M ﹤0.01% 3110
2024
Q1 		$4.33M Buy
246,100
+53,200
+28% +$784K ﹤0.01% 4166
2023
Q4 		$3.04M Buy
192,900
+138,000
+251% +$1.42M ﹤0.01% 4625
2023
Q3 		$472K Sell
54,900
-16,600
-23% -$118K ﹤0.01% 8180
2023
Q2 		$564K Sell
71,500
-56,800
-44% -$395K ﹤0.01% 7689
2023
Q1 		$956K Buy
128,300
+104,600
+441% +$1.04M ﹤0.01% 6869
2022
Q4 		$279K Sell
23,700
-36,400
-61% -$416K ﹤0.01% 9469
2022
Q3 		$554K Sell
60,100
-50,200
-46% -$608K ﹤0.01% 8231
2022
Q2 		$1.09M Sell
110,300
-394,200
-78% -$7.95M ﹤0.01% 6823
2022
Q1 		$17.4M Buy
504,500
+258,200
+105% +$8.38M ﹤0.01% 2146
2021
Q4 		$12.3M Buy
246,300
+34,100
+16% +$1.8M ﹤0.01% 2720
2021
Q3 		$9.76M Sell
212,200
-118,900
-36% -$4.71M ﹤0.01% 3123
2021
Q2 		$9.91M Sell
331,100
-19,600
-6% -$400K ﹤0.01% 3090
2021
Q1 		$7.13M Buy
350,700
+334,500
+2,065% +$7.06M ﹤0.01% 3540
2020
Q4 		$270K Buy
+16,200
New +$213K ﹤0.01% 9246

Other funds holding ASPN

KL
KIM LLC Wichita, Kansas $976M AUM 0.91% 1-Year Est. Return
OCMI
Oaktop Capital Management II Chatham, New Jersey $1.34B AUM 114.5% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
NIM
Needham Investment Management New York $1.96B AUM 101.23% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
GKFF
George Kaiser Family Foundation Tulsa, Oklahoma $883M AUM 21.04% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
GS
Gagnon Securities New York $433M AUM 29.08% 1-Year Est. Return
RHJA
Rice Hall James & Associates San Diego, California $1.8B AUM 36.16% 1-Year Est. Return

Citadel Advisors's ASPN Position: Q1 2026 in Review

Citadel Advisors reduced its Aspen Aerogels (ASPN) stake by 33% in Q1 2026, selling an estimated $961K and leaving 581,187 shares worth $1.99M. The position accounts for ﹤0.01% of the portfolio, ranked #6076.

Citadel Advisors first reported a position in ASPN in Q4 2015 and has held it in 25 quarters since. The position peaked at $15M in Q2 2024. 166 funds tracked by Wall St. Rank hold ASPN as of Q1 2026.

  • Citadel Advisors held 581,187 shares of Aspen Aerogels worth $1.99M as of Q1 2026.
  • Citadel Advisors sold 285,031 Aspen Aerogels shares in Q1 2026, an estimated $961K.
  • Aspen Aerogels made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #6076 holding.
  • Citadel Advisors first reported a position in Aspen Aerogels in Q4 2015 and has held it in 25 quarters since.
  • Citadel Advisors's Aspen Aerogels position peaked at $15M in Q2 2024.
  • 166 funds tracked by Wall St. Rank held Aspen Aerogels as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.