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Equibles

ASPN

Aspen Aerogels Inc

Company with tickers: ASPN

CIK
1145986
CUSIP
04523Y105
Shares Outstanding
82,877,453
13F Activity (30d)
72 filings 68 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 135
Total Value: $158,152,007
Total Shares: 46,243,296
Showing 1–100 of 138 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 135 13F filers · Δ vs Dec 31, 2025
Top Holder
26.6%
Jun 2023 → Mar 2026 · range 8.3% – 30.9%
−4.4 pts
Top 5
57.0%
Jun 2023 → Mar 2026 · range 33.4% – 60.3%
−3.3 pts
Top 10
73.2%
Jun 2023 → Mar 2026 · range 48.7% – 73.5%
−0.3 pts
HHI
1,042
Jun 2023 → Mar 2026 · range 350 – 1,255
Broadly held−213

Quarterly Activity

vs Dec 31, 2025
New
29
Increased
34
Decreased
43
Sold Out
49
Unchanged
29
Holder count: -20
Institutional value: +40.7%
Shares held: +16.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large JACOBS LEVY EQUITY MANAGEMENT, INC +1,078,666 1,218,779
Mega D. E. Shaw & Co., Inc. +810,355 833,572
Mid OAKTOP CAPITAL MANAGEMENT II, L.P. +774,149 5,168,674
Large MARSHALL WACE, LLP +708,922 1,263,102
Mid ALGERT GLOBAL LLC +270,575 326,410

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP −403,187 450,717
Mega TWO SIGMA INVESTMENTS, LP −315,983 441,436
Mega STATE STREET CORP −180,742 2,320,727
Small Numerai GP LLC −155,988 95,900
Small Samjo Management, LLC −152,900 645,625

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 3,436,156 $11,751,653
Small GAGNON SECURITIES LLC 1,861,851 $6,367,530
Large HRT FINANCIAL LP 870,435 $2,976,887
Mega VANGUARD FIDUCIARY TRUST CO 454,402 $1,554,054
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 157,400 $538,308

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mid Jump Financial, LLC 551,071 $1,559,530
Small FirstWave Capital Management LLC 372,001 $1,052,762
Mega UBS Group AG 315,348 $892,433
Large Centiva Capital, LP 271,247 $767,629
Large SG Americas Securities, LLC 263,354 $745,291
Filter: New 29 Increased 34 Reduced 43 Sold out 49 Unchanged 29
Showing 100 of 138
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Small KIM, LLC $41,999,056 26.56% 12,280,426
Mid OAKTOP CAPITAL MANAGEMENT II, L.P. $17,676,865 11.18% 5,168,674
Mega VANGUARD CAPITAL MANAGEMENT LLC $11,751,653 7.43% 3,436,156
Small George Kaiser Family Foundation Endowment $10,832,241 6.85% 3,167,322
Mega STATE STREET CORP $7,936,886 5.02% 2,320,727
Small GAGNON SECURITIES LLC Broker-Dealer $6,367,530 4.03% 1,861,851
Mid RICE HALL JAMES & ASSOCIATES, LLC $5,309,987 3.36% 1,552,628
Mega GEODE CAPITAL MANAGEMENT, LLC $5,269,436 3.33% 1,540,771
Large MARSHALL WACE, LLP $4,319,807 2.73% 1,263,102
Mega AMERICAN CENTURY COMPANIES INC $4,267,417 2.70% 1,247,783
Large JACOBS LEVY EQUITY MANAGEMENT, INC $4,168,224 2.64% 1,218,779
Mid Telemark Asset Management, LLC $3,420,000 2.16% 1,000,000
Large HRT FINANCIAL LP $2,976,887 1.88% 870,435
Mega D. E. Shaw & Co., Inc. $2,850,816 1.80% 833,572
Mega BNP PARIBAS ARBITRAGE, SA $2,386,927 1.51% 697,932
Small Samjo Management, LLC $2,208,037 1.40% 645,625
Mega NORTHERN TRUST CORP Bank $1,790,102 1.13% 523,422
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,554,054 0.98% 454,402
Small Palogic Value Management, L.P. $1,539,000 0.97% 450,000
Mega TWO SIGMA INVESTMENTS, LP $1,509,711 0.95% 441,436
Mega DEUTSCHE BANK AG\ Bank $1,229,608 0.78% 359,535
Mid ALGERT GLOBAL LLC $1,116,322 0.71% 326,410
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $938,164 0.59% 274,317
Mega CITIGROUP INC $799,133 0.51% 233,665
Mid XTX Topco Ltd $688,675 0.44% 201,367
Mega FIRST TRUST ADVISORS LP $619,820 0.39% 181,234
Small IRONWOOD INVESTMENT MANAGEMENT LLC $569,929 0.36% 166,646
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $538,308 0.34% 157,400
Large TUDOR INVESTMENT CORP ET AL $516,738 0.33% 151,093
Mid Inspire Investing, LLC $516,433 0.33% 151,004
Mid Engineers Gate Manager LP $506,703 0.32% 148,159
Small EntryPoint Capital, LLC $501,621 0.32% 146,673
Large Man Group plc $490,161 0.31% 143,322
Large LAZARD ASSET MANAGEMENT LLC $484,767 0.31% 141,745
Mega Nuveen, LLC $460,561 0.29% 134,667
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $445,284 0.28% 130,200
Mega Mitsubishi UFJ Asset Management Co., Ltd. $435,981 0.28% 127,480
Micro Firsthand Capital Management, Inc. $427,500 0.27% 125,000
Small Dynamic Technology Lab Private Ltd $416,193 0.26% 121,694
Small Sargent Investment Group, LLC $398,282 0.25% 116,457
Large Russell Investments Group, Ltd. $391,198 0.25% 114,386
Mega HSBC HOLDINGS PLC $359,038 0.23% 104,982
Mid RBF Capital, LLC $342,000 0.22% 100,000
Large Walleye Capital LLC $332,424 0.21% 97,200
Small Numerai GP LLC $327,978 0.21% 95,900
Mega RHUMBLINE ADVISERS $287,276 0.18% 83,999
Mid OPPENHEIMER & CO INC $260,891 0.16% 76,284
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $256,500 0.16% 75,000
Micro WJ Financial Advisors LLC $218,691 0.14% 63,945
Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension $214,434 0.14% 62,700
Large Squarepoint Ops LLC $204,351 0.13% 59,752
Mid Graham Capital Management, L.P. $179,300 0.11% 52,427
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $158,004 0.10% 46,200
Large Walleye Trading LLC $153,558 0.10% 44,900
Small Odyssean, LLC $142,815 0.09% 41,759
Small nVerses Capital, LLC $138,667 0.09% 40,546
Mega LPL Financial LLC $132,863 0.08% 38,849
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $107,890 0.07% 31,547
Mid Concurrent Investment Advisors, LLC $102,771 0.06% 30,050
Mega Vanguard Global Advisers, LLC $97,747 0.06% 28,581
Large PANAGORA ASSET MANAGEMENT INC $95,428 0.06% 27,903
Small AXQ CAPITAL, LP $91,054 0.06% 26,624
Large CWM, LLC $84,220 0.05% 24,626
Mid IMC-Chicago, LLC $76,847 0.05% 22,470
Large OSAIC HOLDINGS, INC. $67,062 0.04% 19,609
Mid INTECH INVESTMENT MANAGEMENT LLC $63,543 0.04% 18,580
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $62,579 0.04% 18,298
Mid CHOREO, LLC $58,995 0.04% 17,250
Large Police & Firemen's Retirement System of New Jersey Pension $56,987 0.04% 16,663
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $55,510 0.04% 16,231
Mid Legato Capital Management LLC $53,222 0.03% 15,562
Large MetLife Investment Management, LLC $51,703 0.03% 15,118
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $49,993 0.03% 14,618
Mid Brevan Howard Capital Management LP $39,736 0.03% 11,619
Large VOYA INVESTMENT MANAGEMENT LLC $39,716 0.03% 11,613
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $37,708 0.02% 11,026
Mid Aptus Capital Advisors, LLC $36,036 0.02% 10,537
Micro Clarus Group, Inc. $35,923 0.02% 10,504
Large Cerity Partners LLC $34,716 0.02% 10,151
Mid Choate Investment Advisors $34,200 0.02% 10,000
Mid Cannell & Spears LLC $34,200 0.02% 10,000
Mid IFP Advisors, Inc $30,427 0.02% 8,897
Small Essential Partners LLC $22,989 0.01% 6,722
Mega Legal & General Group Plc $20,639 0.01% 6,035
Micro Strategic Investment Solutions, Inc. /IL $20,554 0.01% 6,010
Mid Ameritas Investment Partners, Inc. $19,521 0.01% 5,708
Mid MAI Capital Management $16,563 0.01% 4,843
Mid Quantbot Technologies LP $15,468 0.01% 4,523
Mid SBI Securities Co., Ltd. Broker-Dealer $14,910 0.01% 4,360
Mid Optiver Holding B.V. $14,387 0.01% 4,207
Mid Banque Cantonale Vaudoise $14,206 0.01% 4,154
Small First PREMIER Bank Bank $13,680 0.01% 4,000
Micro Gunpowder Capital Management, LLC dba Oliver Wealth Management $13,211 0.01% 3,863
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $12,270 0.01% 3,588
Mid State of Alaska, Department of Revenue $11,576 0.01% 3,385
Mid Tower Research Capital LLC (TRC) $11,477 0.01% 3,356
Mid Aquatic Capital Management LLC $10,591 0.01% 3,097
Small Covestor Ltd $8,443 0.01% 2,469
Mid SIMPLEX TRADING, LLC $8,119 0.01% 2,374
Mid Sterling Capital Management LLC $7,506 0.00% 2,195

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