Security key
04523Y105
ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN)
CUSIP: 04523Y105
Q2 2025 13F Holders as of 30 Jun 2025
- Security type / class
- Equity / Common Stock, par value $0.00001 per share
- Total 13F shares
- 71,504,120
- Total 13F value
- $423,792,194
- Share change
- +218,676
- Put/Call ratio
- 55%
- SEC-reported price per share
- $5.92
- Number of holders
- 181
- Value change
- -$835,712
- Number of buys
- 98
- Number of sells
- 117
- Shares outstanding
- 83,610,256
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2025
Institutions
181
Top holders
10
ASPN full security history
Ownership snapshot
Full 13F holder table
ASPEN AEROGELS INC SEC filings
ASPEN AEROGELS INC company facts
Broader feeds
Ownership snapshot
Top reported holders of ASPN - ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
OAKTOP CAPITAL MANAGEMENT...
Disclosed value leader
KIM, LLC
Comparable rows
15/15
Latest evidence
31 Mar 2025
13F
13D/G
Lead comparable stake: 5.4%
13D/G row: OAKTOP CAPITAL MANAGEMENT II, L.P.
Showing 1-6 of 15 holder rows.
Quick read
OAKTOP CAPITAL MANAGEMENT II, L.P. leads the comparable SEC ownership view at 5.4%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens OAKTOP CAPITAL MANAGEMENT II, L.P.'s linked filing trail.
Comparable ownership
Top 5
OAKTOP CAPITAL MANAGEMENT II, L.P.
5.4%
FMR LLC
1.5%
KIM, LLC
15%
BlackRock, Inc.
5.9%
VANGUARD GROUP INC
5.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| OAKTOP CAPITAL MANAGEMENT II, L.P. |
13F
13D/G
Company
|
5.4%
from 13D/G
|
$28,081,015
4,394,525 shares
|
— | 31 Mar 2025 |
| FMR LLC |
13F
13D/G
Company
|
1.5%
from 13D/G
|
$7,777,523
1,217,140 shares
|
— | 31 Mar 2025 |
| KIM, LLC |
13F
Company
|
15%
|
$78,471,922
12,280,426 shares
|
— | 31 Mar 2025 |
| BlackRock, Inc. |
13F
Company
|
5.9%
|
$31,695,500
4,960,172 shares
|
— | 31 Mar 2025 |
| VANGUARD GROUP INC |
13F
Company
|
5.2%
|
$27,944,486
4,373,159 shares
|
— | 31 Mar 2025 |
| GEORGE KAISER FAMILY FOUNDATION |
13F
Individual
|
3.8%
|
$20,239,188
3,167,322 shares
|
— | 31 Mar 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
181
Shares
71,504,120
Rows available
181
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2025 vs Q1 2025 Across Filers
Q1 2025 holders
217
Q2 2025 holders
181
Holder diff
-36
| Investor | Q1 2025 Shares | Q2 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q2 2025 value | Value change | Value Chg % |
|---|