California State Teachers Retirement System (CalSTRS)
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California State Teachers Retirement System (CalSTRS)’s Aspen Aerogels ASPN Stock Holding History

California State Teachers Retirement System (CalSTRS)’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 		$5.89K Sell
929
-2,659
-74% -$13K ﹤0.01% 2480
2026
Q1 		$12.3K Sell
3,588
-74,866
-95% -$252K ﹤0.01% 2598
2025
Q4 		$222K Buy
78,454
+17,784
+29% +$91.7K ﹤0.01% 2232
2025
Q3 		$422K Buy
60,670
+4,151
+7% +$29.3K ﹤0.01% 2148
2025
Q2 		$335K Sell
56,519
-4,526
-7% -$26K ﹤0.01% 2181
2025
Q1 		$390K Hold
61,045
– – ﹤0.01% 2155
2024
Q4 		$725K Buy
61,045
+264
+0.4% +$4.5K ﹤0.01% 1946
2024
Q3 		$1.68M Buy
60,781
+1,155
+2% +$28.9K ﹤0.01% 1490
2024
Q2 		$1.42M Sell
59,626
-413
-0.7% -$9.69K ﹤0.01% 1573
2024
Q1 		$1.06M Buy
60,039
+4,734
+9% +$69.8K ﹤0.01% 1774
2023
Q4 		$873K Sell
55,305
-2,401
-4% -$24.8K ﹤0.01% 1908
2023
Q3 		$496K Sell
57,706
-14,766
-20% -$105K ﹤0.01% 2204
2023
Q2 		$572K Buy
72,472
+1,465
+2% +$10.2K ﹤0.01% 2228
2023
Q1 		$529K Buy
71,007
+7,178
+11% +$71.4K ﹤0.01% 2282
2022
Q4 		$753K Buy
63,829
+23,749
+59% +$271K ﹤0.01% 2096
2022
Q3 		$370K Buy
40,080
+2,925
+8% +$35.4K ﹤0.01% 2458
2022
Q2 		$367K Buy
37,155
+5,273
+17% +$106K ﹤0.01% 2517
2022
Q1 		$1.1M Sell
31,882
-2,436
-7% -$79.1K ﹤0.01% 1989
2021
Q4 		$1.71M Buy
34,318
+22,364
+187% +$1.18M ﹤0.01% 1829
2021
Q3 		$550K Sell
11,954
-17,818
-60% -$706K ﹤0.01% 2440
2021
Q2 		$891K Sell
29,772
-1,376
-4% -$28.1K ﹤0.01% 2279
2021
Q1 		$634K Buy
31,148
+320
+1% +$6.75K ﹤0.01% 2415
2020
Q4 		$515K Hold
30,828
– – ﹤0.01% 2410
2020
Q3 		$338K Hold
30,828
– – ﹤0.01% 2475
2020
Q2 		$203K Buy
+30,828
New +$198K ﹤0.01% 2708
2015
Q2 		– Sell
-10,444
Closed -$76K – 3002
2015
Q1 		$76K Hold
10,444
– – ﹤0.01% 3006
2014
Q4 		$83K Buy
10,444
+44
+0.4% +$373 ﹤0.01% 3024
2014
Q3 		$105K Buy
+10,400
New +$105K ﹤0.01% 2990

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

California State Teachers Retirement System (CalSTRS)'s ASPN Position: Q2 2026 in Review

California State Teachers Retirement System (CalSTRS) reduced its Aspen Aerogels (ASPN) stake by 74% in Q2 2026, selling an estimated $13K and leaving 929 shares worth $5.89K. The position accounts for ﹤0.01% of the portfolio, ranked #2480.

California State Teachers Retirement System (CalSTRS) first reported a position in ASPN in Q3 2014 and has held it in 28 quarters since. The position peaked at $1.71M in Q4 2021. 180 funds tracked by Wall St. Rank hold ASPN as of Q2 2026.

  • California State Teachers Retirement System (CalSTRS) held 929 shares of Aspen Aerogels worth $5.89K as of Q2 2026.
  • California State Teachers Retirement System (CalSTRS) sold 2,659 Aspen Aerogels shares in Q2 2026, an estimated $13K.
  • Aspen Aerogels made up ﹤0.01% of California State Teachers Retirement System (CalSTRS)'s portfolio in Q2 2026, its #2480 holding.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Aspen Aerogels in Q3 2014 and has held it in 28 quarters since.
  • California State Teachers Retirement System (CalSTRS)'s Aspen Aerogels position peaked at $1.71M in Q4 2021.
  • 180 funds tracked by Wall St. Rank held Aspen Aerogels as of Q2 2026.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q2 2026, filed 24 Aug 2026.