Latest Period
Q1 2026
Security Snapshot
ASPEN AEROGELS INC - Common Stock (ASPN) Institutional Ownership
CUSIP: 04523Y105
13F Institutional Holders and Ownership History from Q2 2014 to Q1 2026
Institutions Reporting
165
Shares (Excl. Options)
69,302,490
Price
$3.42
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- Security type / class
- Equity / Common Stock
- Symbol
- ASPN on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 69,302,490
- Total 13F value
- $236,737,179
- Portfolio coverage rank
- 0%
- Share change
- -635,919
- Value change
- -$133,912
- Number of holders
- 165
- Shares outstanding
- 82,107,547
- SEC-reported price per share
- $5.12
- Insider filing price
- $5.12
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 is tracked under CUSIP 04523Y105.
- 165 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 182 to 165 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $198,086,158 to $236,737,179.
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 165 institutions filings for Q1 2026.
Security key
04523Y105
Latest holder period
Q1 2026
13F holders
165
13D/G owners
3
CIK / CUSIP context first
Open Q1 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 | 5.3% | $14,360,610 | 4,351,700 | NEEDHAM INVESTMENT MANAGEMENT L.L.C. | 31 Dec 2025 | |||
| FMR LLC | 1.5% | $6,694,361 | 1,226,073 | FMR LLC | 31 Dec 2024 |
As of 31 Mar 2026, 165 institutional investors reported holding 69,302,490 shares of ASPEN AEROGELS INC - Common Stock (ASPN). This represents 84% of the company’s total 82,107,547 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
70%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| KIM, LLC | 15% | 12,280,426 | 0% | 6.2% | $41,999,057 |
| OAKTOP CAPITAL MANAGEMENT II, L.P. | 6.3% | 5,168,674 | +18% | 1.3% | $17,676,865 |
| BlackRock, Inc. | 5.8% | 4,743,076 | -3.8% | 0% | $16,221,320 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 5.5% | 4,518,775 | +3.8% | 0.79% | $15,454,211 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.2% | 3,436,156 | 0% | 0% | $11,751,654 |
| George Kaiser Family Foundation | 3.9% | 3,167,322 | 0% | 1.2% | $10,832,241 |
| STATE STREET CORP | 2.8% | 2,320,727 | -7.2% | 0% | $7,936,886 |
| Invesco Ltd. | 2.8% | 2,298,183 | -44% | 0% | $7,859,786 |
| GAGNON SECURITIES LLC | 2.3% | 1,861,851 | +64% | 1.5% | $6,367,530 |
| RICE HALL JAMES & ASSOCIATES, LLC | 1.9% | 1,552,628 | +9.2% | 0.3% | $5,309,988 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.9% | 1,540,771 | -3.8% | 0% | $5,271,080 |
| AMERIPRISE FINANCIAL INC | 1.8% | 1,506,379 | +9.3% | 0% | $5,151,816 |
| MILLENNIUM MANAGEMENT LLC | 1.7% | 1,404,675 | +61% | 0% | $4,803,988 |
| MARSHALL WACE, LLP | 1.5% | 1,263,102 | +128% | 0% | $4,319,807 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 1,256,480 | -37% | 0% | $4,296,033 |
| AMERICAN CENTURY COMPANIES INC | 1.5% | 1,247,783 | +7.8% | 0% | $4,267,418 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 1.5% | 1,218,779 | +770% | 0.02% | $4,168,224 |
| Telemark Asset Management, LLC | 1.2% | 1,000,000 | 0% | 0.32% | $3,420,000 |
| ROYCE & ASSOCIATES LP | 1.2% | 986,513 | 0.03% | $3,373,874 | |
| JPMORGAN CHASE & CO | 1.2% | 965,492 | -35% | 0% | $3,060,610 |
| GOLDMAN SACHS GROUP INC | 1.1% | 899,513 | -31% | 0% | $3,076,334 |
| HRT FINANCIAL LP | 1.1% | 870,435 | 0.01% | $2,976,000 | |
| D. E. Shaw & Co., Inc. | 1% | 833,572 | +3490% | 0% | $2,850,816 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.87% | 716,732 | 0% | 0% | $2,451,223 |
| BNP PARIBAS FINANCIAL MARKETS | 0.85% | 697,932 | 0% | 0% | $2,386,927 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
48
Latest
Q1 2026
Rows shown
1-25 of 48
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 69,302,490 | $236,737,179 | -$133,912 | $3.42 | 165 |
| 2025 Q4 | 69,991,554 | $198,086,158 | -$23,908,924 | $2.83 | 182 |
| 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 |
| 2020 Q1 | 18,698,262 | $114,805,860 | +$12,104,709 | $6.14 | 60 |