Latest Period
Q2 2026
Security Snapshot
ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN) Institutional Ownership
CUSIP: 04523Y105
13F Institutional Holders and Ownership History from Q2 2014 to Q2 2026
Institutions Reporting
176
Shares (Excl. Options)
73,152,772
Price
$6.34
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- Security type / class
- Equity / Common Stock, par value $0.00001 per share
- Symbol
- ASPN on NYSE
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 73,152,772
- Total 13F value
- $463,167,431
- Portfolio coverage rank
- 0%
- Share change
- +3,772,038
- Value change
- +$30,681,172
- Number of holders
- 176
- Shares outstanding
- 83,610,256
- SEC-reported price per share
- $6.34
- Insider filing price
- $6.34
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ASPN - ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share is tracked under CUSIP 04523Y105.
- 176 institutions reported positions in Q2 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 166 to 176 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $236,737,809 to $463,167,431.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 176 institutions filings for Q2 2026.
Security key
04523Y105
Latest holder period
Q2 2026
13F holders
176
13D/G owners
3
CIK / CUSIP context first
Open Q2 2026 holders
ASPN full holder history
ASPEN AEROGELS INC SEC filings
ASPEN AEROGELS INC company facts
ASPEN AEROGELS INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 04523Y105:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
ASPN
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| OAKTOP CAPITAL MANAGEMENT II, L.P. | 5.4% | $23,994,106 | 4,394,525 | Oaktop Capital Management II, L.P. | 31 Mar 2025 | |||
| NEEDHAM INVESTMENT MANAGEMENT LLC | 3.9% | -28% | $20,673,472 | -$6,916,306 | 3,260,800 | -25% | Needham Investment Management L.L.C. | 30 Jun 2026 |
| FMR LLC | 1.5% | $6,694,361 | 1,226,073 | FMR LLC | 31 Dec 2024 |
As of 30 Jun 2026, 176 institutional investors reported holding 73,152,772 shares of ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN). This represents 87% of the company’s total 83,610,256 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
73%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| KIM, LLC | 15% | 12,280,426 | 0% | 11% | $77,857,901 |
| BlackRock, Inc. | 6.3% | 5,277,148 | +11% | 0% | $33,457,120 |
| OAKTOP CAPITAL MANAGEMENT II, L.P. | 6.2% | 5,168,674 | 0% | 1.4% | $32,769,393 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.2% | 3,539,271 | +3% | 0% | $22,438,978 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 3.9% | 3,260,800 | -28% | 0.62% | $20,673,472 |
| George Kaiser Family Foundation | 3.8% | 3,167,322 | 0% | 1.9% | $20,080,821 |
| STATE STREET CORP | 3.1% | 2,559,495 | +10% | 0% | $16,227,198 |
| AMERICAN CENTURY COMPANIES INC | 3% | 2,510,042 | +101% | 0.01% | $15,913,666 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 2.5% | 2,058,083 | +69% | 0.05% | $13,048,246 |
| AMERIPRISE FINANCIAL INC | 2.2% | 1,821,295 | +21% | 0% | $11,547,010 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 1,770,425 | +15% | 0% | $11,227,752 |
| RICE HALL JAMES & ASSOCIATES, LLC | 2% | 1,635,259 | +5.3% | 0.5% | $10,367,542 |
| Invesco Ltd. | 1.9% | 1,619,972 | -30% | 0% | $10,270,622 |
| GAGNON SECURITIES LLC | 1.8% | 1,535,812 | -18% | 1.9% | $9,737,048 |
| DIMENSIONAL FUND ADVISORS LP | 1.7% | 1,447,333 | +15% | 0% | $9,174,123 |
| GOLDMAN SACHS GROUP INC | 1.6% | 1,372,300 | +53% | 0% | $8,700,382 |
| ROYCE & ASSOCIATES LP | 1.6% | 1,323,218 | +34% | 0.07% | $8,389,202 |
| AQR CAPITAL MANAGEMENT LLC | 1.5% | 1,276,346 | +143% | 0% | $8,092,034 |
| MILLENNIUM MANAGEMENT LLC | 1.4% | 1,190,616 | -15% | 0.01% | $7,548,505 |
| MARSHALL WACE, LLP | 1.4% | 1,146,707 | -9.2% | 0.01% | $7,270,122 |
| D. E. Shaw & Co., Inc. | 1.3% | 1,066,501 | +28% | 0% | $6,761,616 |
| JPMORGAN CHASE & CO | 1.2% | 1,004,383 | +4% | 0% | $6,006,210 |
| Telemark Asset Management, LLC | 1.2% | 1,000,000 | 0% | 0.46% | $6,340,000 |
| BNP PARIBAS FINANCIAL MARKETS | 1% | 867,199 | 0% | 0% | $5,498,042 |
| TWO SIGMA INVESTMENTS, LP | 0.93% | 779,468 | +77% | 0% | $4,941,827 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q2 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 73,152,772 | $463,167,431 | +$30,681,172 | $6.34 | 176 |
| 2026 Q1 | 69,302,580 | $236,737,809 | -$133,707 | $3.42 | 166 |
| 2025 Q4 | 69,991,662 | $198,086,464 | -$23,908,924 | $2.83 | 183 |
| 2025 Q3 | 71,366,623 | $496,791,936 | -$108,467 | $6.96 | 202 |
| 2025 Q2 | 71,504,120 | $423,792,194 | -$835,712 | $5.92 | 181 |
| 2025 Q1 | 71,206,827 | $455,066,397 | -$45,808,861 | $6.39 | 217 |
| 2024 Q4 | 73,001,355 | $867,778,873 | -$105,657,383 | $11.88 | 228 |
| 2024 Q3 | 69,401,034 | $1,921,862,940 | -$22,829,124 | $27.69 | 238 |
| 2024 Q2 | 70,532,807 | $1,682,097,439 | -$78,212,843 | $23.85 | 216 |
| 2024 Q1 | 74,247,101 | $1,306,720,369 | -$2,830,981 | $17.60 | 162 |
| 2023 Q4 | 74,870,231 | $1,181,354,395 | +$136,924,909 | $15.78 | 166 |
| 2023 Q3 | 67,761,200 | $582,778,595 | +$28,805,579 | $8.60 | 157 |
| 2023 Q2 | 66,512,915 | $524,617,340 | -$10,871,982 | $7.89 | 158 |
| 2023 Q1 | 67,189,026 | $498,597,203 | -$26,918,463 | $7.45 | 155 |
| 2022 Q4 | 67,314,459 | $793,543,467 | +$354,475,790 | $11.79 | 160 |
| 2022 Q3 | 37,314,044 | $344,117,328 | +$407,623 | $9.22 | 129 |
| 2022 Q2 | 37,073,093 | $366,274,596 | -$154,400,198 | $9.88 | 140 |
| 2022 Q1 | 31,696,973 | $1,092,653,529 | +$98,738,568 | $34.48 | 139 |
| 2021 Q4 | 28,529,908 | $1,420,617,488 | +$23,952,968 | $49.79 | 156 |
| 2021 Q3 | 27,563,849 | $1,268,080,803 | -$1,101,618 | $46.01 | 127 |
| 2021 Q2 | 28,413,761 | $849,796,727 | +$128,951,542 | $29.92 | 113 |
| 2021 Q1 | 23,708,215 | $482,202,043 | +$36,805,215 | $20.34 | 83 |
| 2020 Q4 | 21,889,127 | $365,972,946 | +$23,787,605 | $16.69 | 75 |
| 2020 Q3 | 19,785,359 | $216,652,920 | +$7,771,398 | $10.95 | 70 |
| 2020 Q2 | 19,371,151 | $127,452,961 | +$4,920,549 | $6.58 | 66 |