Janus Henderson Group
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Janus Henderson Group’s Aspen Aerogels ASPN Stock Holding History

Janus Henderson Group’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 		– Sell
-30,455
Closed -$86.3K – 2412
2025
Q4 		$86.3K Hold
30,455
– – ﹤0.01% 2399
2025
Q3 		$212K Hold
30,455
– – ﹤0.01% 2323
2025
Q2 		$180K Hold
30,455
– – ﹤0.01% 2337
2025
Q1 		$200K Hold
30,455
– – ﹤0.01% 2362
2024
Q4 		$361K Hold
30,455
– – ﹤0.01% 2175
2024
Q3 		$843K Hold
30,455
– – ﹤0.01% 1761
2024
Q2 		$726K Sell
30,455
-385
-1% -$9.04K ﹤0.01% 1794
2024
Q1 		$543K Buy
30,840
+35
+0.1% +$516 ﹤0.01% 1970
2023
Q4 		$486K Sell
30,805
-54
-0.2% -$558 ﹤0.01% 1999
2023
Q3 		$265K Buy
30,859
+3
+0% +$21 ﹤0.01% 2250
2023
Q2 		$243K Sell
30,856
-12
-0% -$84 ﹤0.01% 2359
2023
Q1 		$230K Buy
+30,868
New +$307K ﹤0.01% 2425
2022
Q1 		– Sell
-5,296
Closed -$264K – 2652
2021
Q4 		$264K Buy
+5,296
New +$279K ﹤0.01% 2257

Other funds holding ASPN

KL
KIM LLC Wichita, Kansas $1B AUM 29.68% 1-Year Est. Return
OCMI
Oaktop Capital Management II Chatham, New Jersey $2.35B AUM 214.39% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
NIM
Needham Investment Management New York $3.33B AUM 163.16% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
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
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
GS
Gagnon Securities New York $519M AUM 44.91% 1-Year Est. Return
RHJA
Rice Hall James & Associates San Diego, California $2.05B AUM 43.16% 1-Year Est. Return

Janus Henderson Group's ASPN Position: Q1 2026 in Review

Janus Henderson Group sold out of Aspen Aerogels (ASPN) in Q1 2026, closing a stake of 30,455 shares — an estimated $86.3K sold.

Janus Henderson Group first reported a position in ASPN in Q4 2021 and held it in 13 quarters. The position peaked at $843K in Q3 2024. 166 funds tracked by Wall St. Rank hold ASPN as of Q1 2026.

  • Janus Henderson Group reported no remaining Aspen Aerogels position as of Q1 2026 after selling out during the quarter.
  • Janus Henderson Group sold 30,455 Aspen Aerogels shares in Q1 2026, an estimated $86.3K.
  • Janus Henderson Group first reported a position in Aspen Aerogels in Q4 2021 and held it in 13 quarters.
  • Janus Henderson Group's Aspen Aerogels position peaked at $843K in Q3 2024.
  • 166 funds tracked by Wall St. Rank held Aspen Aerogels as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.