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
Q2 		$1.51M Sell
238,731
-342,456
-59% -$1.68M ﹤0.01% 7192
2026
Q1 		$1.99M Sell
581,187
-285,031
-33% -$961K ﹤0.01% 6076
2025
Q4 		$2.45M Sell
866,218
-248,372
-22% -$1.28M ﹤0.01% 5545
2025
Q3 		$7.76M Buy
1,114,590
+951,558
+584% +$6.71M ﹤0.01% 3624
2025
Q2 		$965K Sell
163,032
-414,728
-72% -$2.39M ﹤0.01% 7184
2025
Q1 		$3.69M Sell
577,760
-46,470
-7% -$448K ﹤0.01% 4397
2024
Q4 		$7.42M Buy
624,230
+226,445
+57% +$3.86M ﹤0.01% 3361
2024
Q3 		$11M Sell
397,785
-232,771
-37% -$5.82M ﹤0.01% 2753
2024
Q2 		$15M Buy
630,556
+578,280
+1,106% +$13.6M ﹤0.01% 2313
2024
Q1 		$920K Sell
52,276
-222,777
-81% -$3.28M ﹤0.01% 7091
2023
Q4 		$4.34M Sell
275,053
-392,776
-59% -$4.06M ﹤0.01% 4011
2023
Q3 		$5.74M Buy
667,829
+238,171
+55% +$1.69M ﹤0.01% 3440
2023
Q2 		$3.39M Sell
429,658
-255,861
-37% -$1.78M ﹤0.01% 4253
2023
Q1 		$5.11M Buy
685,519
+447,452
+188% +$4.45M ﹤0.01% 3777
2022
Q4 		$2.81M Buy
238,067
+137,567
+137% +$1.57M ﹤0.01% 4857
2022
Q3 		$927K Buy
100,500
+44,911
+81% +$544K ﹤0.01% 7165
2022
Q2 		$549K Sell
55,589
-136,249
-71% -$2.75M ﹤0.01% 8434
2022
Q1 		$6.61M Buy
191,838
+69,155
+56% +$2.24M ﹤0.01% 3642
2021
Q4 		$6.11M Buy
122,683
+77,668
+173% +$4.09M ﹤0.01% 3942
2021
Q3 		$2.07M Buy
45,015
+13,937
+45% +$552K ﹤0.01% 6262
2021
Q2 		$930K Sell
31,078
-18,121
-37% -$370K ﹤0.01% 8551
2021
Q1 		$1M Buy
49,199
+26,404
+116% +$557K ﹤0.01% 8109
2020
Q4 		$380K Buy
+22,795
New +$300K ﹤0.01% 8655
2020
Q2 		– Sell
-17,273
Closed -$106K – 9738
2020
Q1 		$106K Buy
+17,273
New +$140K ﹤0.01% 8593
2017
Q2 		– Sell
-10,428
Closed -$43K – 7446
2017
Q1 		$43K Buy
+10,428
New +$44.4K ﹤0.01% 7076
2016
Q1 		– Sell
-38,659
Closed -$235K – 6735
2015
Q4 		$235K Buy
+38,659
New +$268K ﹤0.01% 5576

Other funds holding ASPN

KL
KIM LLC Wichita, Kansas $1B AUM 29.68% 1-Year Est. Return
BlackRock
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
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
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Jacobs Levy Equity Management
Jacobs Levy Equity Management Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return
Ameriprise
Ameriprise Minneapolis, Minnesota $495B AUM 43.24% 1-Year Est. Return

Citadel Advisors's ASPN Position: Q2 2026 in Review

Citadel Advisors reduced its Aspen Aerogels (ASPN) stake by 59% in Q2 2026, selling an estimated $1.68M and leaving 238,731 shares worth $1.51M. The position accounts for ﹤0.01% of the portfolio, ranked #7192.

Citadel Advisors first reported a position in ASPN in Q4 2015 and has held it in 26 quarters since. The position peaked at $15M in Q2 2024. 180 funds tracked by Wall St. Rank hold ASPN as of Q2 2026.

  • Citadel Advisors held 238,731 shares of Aspen Aerogels worth $1.51M as of Q2 2026.
  • Citadel Advisors sold 342,456 Aspen Aerogels shares in Q2 2026, an estimated $1.68M.
  • Aspen Aerogels made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #7192 holding.
  • Citadel Advisors first reported a position in Aspen Aerogels in Q4 2015 and has held it in 26 quarters since.
  • Citadel Advisors's Aspen Aerogels position peaked at $15M in Q2 2024.
  • 180 funds tracked by Wall St. Rank held Aspen Aerogels as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.