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Aspen Aerogels, Inc. (ASPN) institutional ownership

Latest close $5.03 Jul 20, 2026
Market cap$424M 52-week range SectorIndustrials
Funds holding · Q1 2026
178
reported ASPN position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
73 buyers · 105 sellers

Aspen Aerogels, Inc. (ASPN) price and institutional activity

Dates

Q1 2026

$0 bought by 73 investors
Jacobs Levy Equity Management, IncRoyce & Associates LP +71 more
$0 sold by 105 investors
Invesco Ltd.Dimensional +103 more
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Bought Sold Totals per quarter; hover a bar for the names.

Aspen Aerogels, Inc. (ASPN) institutional activity · 178

Investor Type Est. change Change Δ Own Date
Invesco Ltd. · Reduced
Change −1.8M Δ Own −44.4% Date Q1 2026
Invesco Ltd. Reduced· Q1 2026 −1.8M −44.4% Q1 2026
Jacobs Levy Equity Management, Inc · Added
Change +1.1M Date Q1 2026
Jacobs Levy Equity Management, Inc Added· Q1 2026 +1.1M Q1 2026
Royce & Associates LP · New
Change +987K Date Q1 2026
Royce & Associates LP New· Q1 2026 +987K Q1 2026
Hrt Financial LP · New
Change +870K Date Q1 2026
Hrt Financial LP New· Q1 2026 +870K Q1 2026
D. E. Shaw & Co., Inc. · Added
Change +810K Δ Own +3490.4% Date Q1 2026
D. E. Shaw & Co., Inc. Added· Q1 2026 +810K +3490.4% Q1 2026
Oaktop Capital Management Ii, L.P. · Added
Change +774K Date Q1 2026
Oaktop Capital Management Ii, L.P. Added· Q1 2026 +774K Q1 2026
Dimensional · Reduced
Change −747K Date Q1 2026
Dimensional Reduced· Q1 2026 −747K Q1 2026
Gagnon Securities LLC · Added
Change +729K Date Q1 2026
Gagnon Securities LLC Added· Q1 2026 +729K Q1 2026
Marshall Wace, LLP · Added
Change +709K Date Q1 2026
Marshall Wace, LLP Added· Q1 2026 +709K Q1 2026
First Eagle Investment Management, LLC · Exited
Change −622K Δ Own −100.0% Date Q1 2026
First Eagle Investment Management, LLC Exited· Q1 2026 −622K −100.0% Q1 2026
Jump Financial, LLC · Exited
Change −551K Δ Own −100.0% Date Q1 2026
Jump Financial, LLC Exited· Q1 2026 −551K −100.0% Q1 2026
Millennium Management LLC · Added
Change +534K Date Q1 2026
Millennium Management LLC Added· Q1 2026 +534K Q1 2026
JPMorgan Chase & Co · Reduced
Change −518K Date Q1 2026
JPMorgan Chase & Co Reduced· Q1 2026 −518K Q1 2026
Bank of America Corp · Reduced
Change −511K Date Q1 2026
Bank of America Corp Reduced· Q1 2026 −511K Q1 2026
Goldman Sachs Group Inc · Reduced
Change −395K Date Q1 2026
Goldman Sachs Group Inc Reduced· Q1 2026 −395K Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 178

Famous investor activity in Aspen Aerogels, Inc. (ASPN)

Aspen Aerogels, Inc. (ASPN) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Noglows William P. · Director 2 operations 0
Price $4.75 Owned 0 Trade date Jun 23, 2026 Filed date Jun 26, 2026
Noglows William P. Director 2 operations $4.75 0 0 Jun 23, 2026 Jun 26, 2026
Mitchell Steven R. · Director 2 operations 19K
Owned 9K Trade date May 13, 2026 Filed date May 14, 2026
Mitchell Steven R. Director 2 operations 19K 9K May 13, 2026 May 14, 2026
Sweetnam James E. · Director 2 operations 19K
Owned 9K Trade date May 13, 2026 Filed date May 14, 2026
Sweetnam James E. Director 2 operations 19K 9K May 13, 2026 May 14, 2026
Noglows William P. · Director 2 operations 19K
Owned 9K Trade date May 13, 2026 Filed date May 14, 2026
Noglows William P. Director 2 operations 19K 9K May 13, 2026 May 14, 2026
Kool Kathleen · Director 2 operations 19K
Owned 9K Trade date May 13, 2026 Filed date May 14, 2026
Kool Kathleen Director 2 operations 19K 9K May 13, 2026 May 14, 2026
Robinson Cari · Director 2 operations 19K
Owned 9K Trade date May 13, 2026 Filed date May 14, 2026
Robinson Cari Director 2 operations 19K 9K May 13, 2026 May 14, 2026
Whitaker Corby C. · Officer Tax withholding or exercise payment (F) -$6K
Price $3.22 Qty -2K Owned 205K Trade date Mar 8, 2026 Filed date Mar 10, 2026
Whitaker Corby C. Officer Tax withholding or exercise payment (F) $3.22 -2K -$6K 205K Mar 8, 2026 Mar 10, 2026
Thoele Grant Douglas · Officer Tax withholding or exercise payment (F) -$2K
Price $3.22 Qty -590 Owned 78K Trade date Mar 8, 2026 Filed date Mar 10, 2026
Thoele Grant Douglas Officer Tax withholding or exercise payment (F) $3.22 -590 -$2K 78K Mar 8, 2026 Mar 10, 2026
Young Donald R. · Director Tax withholding or exercise payment (F) -$14K
Price $3.22 Qty -4K Owned 638K Trade date Mar 8, 2026 Filed date Mar 10, 2026
Young Donald R. Director Tax withholding or exercise payment (F) $3.22 -4K -$14K 638K Mar 8, 2026 Mar 10, 2026
Landes Gregg · Officer Tax withholding or exercise payment (F) -$6K
Price $3.22 Qty -2K Owned 103K Trade date Mar 8, 2026 Filed date Mar 10, 2026
Landes Gregg Officer Tax withholding or exercise payment (F) $3.22 -2K -$6K 103K Mar 8, 2026 Mar 10, 2026
Young Donald R. · Director, Officer Tax withholding or exercise payment (F) -$28K
Price $3.27 Qty -9K Owned 642K Trade date Mar 5, 2026 Filed date Mar 6, 2026
Young Donald R. Director, Officer Tax withholding or exercise payment (F) $3.27 -9K -$28K 642K Mar 5, 2026 Mar 6, 2026
Landes Gregg · Officer Tax withholding or exercise payment (F) -$12K
Price $3.27 Qty -4K Owned 105K Trade date Mar 5, 2026 Filed date Mar 6, 2026
Landes Gregg Officer Tax withholding or exercise payment (F) $3.27 -4K -$12K 105K Mar 5, 2026 Mar 6, 2026
Whitaker Corby C. · Officer Tax withholding or exercise payment (F) -$13K
Price $3.27 Qty -4K Owned 207K Trade date Mar 5, 2026 Filed date Mar 6, 2026
Whitaker Corby C. Officer Tax withholding or exercise payment (F) $3.27 -4K -$13K 207K Mar 5, 2026 Mar 6, 2026
Daniel Santhosh P. · Officer Tax withholding or exercise payment (F) -$3K
Price $3.27 Qty -986 Owned 15K Trade date Mar 5, 2026 Filed date Mar 6, 2026
Daniel Santhosh P. Officer Tax withholding or exercise payment (F) $3.27 -986 -$3K 15K Mar 5, 2026 Mar 6, 2026
Thoele Grant Douglas · Officer Tax withholding or exercise payment (F) -$8K
Price $3.27 Qty -2K Owned 78K Trade date Mar 5, 2026 Filed date Mar 6, 2026
Thoele Grant Douglas Officer Tax withholding or exercise payment (F) $3.27 -2K -$8K 78K Mar 5, 2026 Mar 6, 2026
15 of 27
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Aspen Aerogels, Inc. (ASPN) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Wood River Capital, LLC 12.3M
% of shares outstanding 15.9% Filing date Aug 19, 2024
Wood River Capital, LLC 12.3M 15.9% Aug 19, 2024
Vanguard Group Inc 4.1M
% of shares outstanding 5.4% Filing date Nov 12, 2024
Vanguard Group Inc 4.1M 5.4% Nov 12, 2024
BlackRock Inc. 4.1M
% of shares outstanding 5.3% Filing date Jan 31, 2024
BlackRock Inc. 4.1M 5.3% Jan 31, 2024
FMR LLC 4.1M
% of shares outstanding 5.3% Filing date Nov 12, 2024
FMR LLC 4.1M 5.3% Nov 12, 2024
Oaktop Capital Management Ii, L.P.
% of shares outstanding 4.8% Filing date Feb 14, 2023
Oaktop Capital Management Ii, L.P. 4.8% Feb 14, 2023
Encompass Capital Advisors LLC 3.0M
% of shares outstanding 4.5% Filing date Feb 14, 2023
Encompass Capital Advisors LLC 3.0M 4.5% Feb 14, 2023
George Kaiser Family Foundation 3.2M
% of shares outstanding 4.1% Filing date Oct 22, 2024
George Kaiser Family Foundation 3.2M 4.1% Oct 22, 2024
Telemark Asset Management, LLC 2.0M
% of shares outstanding 3.0% Filing date Feb 3, 2023
Telemark Asset Management, LLC 2.0M 3.0% Feb 3, 2023
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Aspen Aerogels, Inc. (ASPN) ownership FAQ

Who owns ASPN?

178 reporting institutions disclosed ASPN position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.