ASPN · Aspen Aerogels Inc · Shareholders & Ownership
$5.63
+0.30 (+5.63%)
At close · Oct 21
Return incl. dividend (before tax)
Market Cap
$464.74M
Shares
82.99M
Volume · Oct 21
1.06M
Avg daily vol (3M)
1.14M
Every disclosed holder of ASPN in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns ASPN
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 73,636,119 | 88.73% |
| Insiders (Forms 3, 4, 5) | 1,683,304 | 2.03% |
| 13D/G-only blocks | 7,150,126 | 8.62% |
| Remaining | 519,235 | 0.63% |
| Registered funds (N-PORT, not summed) | 23,435,559 | 28.24% |
Shares outstanding: 82,988,784, the issuer's latest cover-page count restated onto today's split basis.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of ASPN
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
|
12,280,426 | ||
| 2 |
Orin Hirschman
13G
CIK 1131362 · Investment adviser · Sep 30, 2026
Rule 13d-1(b), qualified institution
|
7,150,126 | ||
| 3 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,277,148 | ||
| 3.1 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,764,384 | ||
| 3.2 |
iShares Russell 2000 Value ETF
Fund
S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
625,823 | ||
| 3.3 |
iShares Micro-Cap ETF
Fund
S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
228,323 | ||
| 3.4 |
Master Small Cap Index Series
Fund
S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
|
126,936 | ||
| 3.5 |
iShares Core S&P Total U.S. Stock Market ETF
Fund
S000004317 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
81,499 | ||
| 4 |
OAKTOP CAPITAL MANAGEMENT II, L.P.
13F
CIK 1550660 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,168,674 | ||
| 5 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,539,271 | ||
| 6 |
NEEDHAM INVESTMENT MANAGEMENT LLC
13F
CIK 1167212 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,260,800 | ||
| 6.1 |
NEEDHAM INVESTMENT MANAGEMENT LLC
13G
CIK 1167212 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
3,260,800 | ||
| 6.2 |
Needham Aggressive Growth Fund
Fund
S000003815 · Registered fund · Jun 30, 2026
Needham Funds Inc, not summed
|
2,075,000 | ||
| 6.3 |
Needham Small Cap Growth Fund
Fund
S000003816 · Registered fund · Jun 30, 2026
Needham Funds Inc, not summed
|
600,000 | ||
| 6.4 |
Needham Growth Fund
Fund
S000003649 · Registered fund · Jun 30, 2026
Needham Funds Inc, not summed
|
350,000 | ||
| 7 |
George Kaiser Family Foundation
13F
CIK 1265376 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,167,322 | ||
| 8 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,642,312 | ||
| 9 |
|
2,559,495 | ||
| 9.1 |
State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF
Fund
S000063362 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
1,077,261 | ||
| 9.2 |
State Street(R) SPDR(R) S&P Kensho Smart Mobility ETF
Fund
S000059701 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
56,541 | ||
| 9.3 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
24,100 | ||
| 9.4 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
1,848 | ||
| 9.5 |
State Street Balanced Index Fund
Fund
S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
374 | ||
| 10 |
AMERICAN CENTURY COMPANIES INC
13F
CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,510,042 | ||
| 11 |
JACOBS LEVY EQUITY MANAGEMENT, INC
13F
CIK 884414 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,058,083 | ||
| 12 |
AMERIPRISE FINANCIAL INC
13F
CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,821,295 | ||
| 12.1 |
Columbia Small Cap Value Discovery Fund
Fund
S000012102 · Registered fund · Jul 31, 2026
COLUMBIA FUNDS SERIES TRUST I, not summed
|
1,101,870 | ||
| 12.2 |
Columbia Variable Portfolio - Small Cap Value Discovery Fund
Fund
S000012561 · Registered fund · Jun 30, 2026
COLUMBIA FUNDS VARIABLE INSURANCE TRUST, not summed
|
199,330 | ||
| 12.3 |
Columbia Research Enhanced Small Cap ETF
Fund
S000095313 · Registered fund · Jun 30, 2026
Columbia ETF Trust I, not summed
|
103 | ||
| 13 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,770,425 | ||
| 14 |
RICE HALL JAMES & ASSOCIATES, LLC
13F
CIK 1230765 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,635,259 | ||
| 15 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,619,972 | ||
| 15.1 |
Invesco WilderHill Clean Energy ETF
Fund
S000003053 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
1,153,459 | ||
| 15.2 |
Invesco RAFI US 1500 Small-Mid ETF
Fund
S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
208,797 | ||
| 16 |
GAGNON SECURITIES LLC
13F
CIK 1125725 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,535,812 | ||
| 17 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,447,333 | ||
| 17.1 |
Dimensional U.S. Targeted Value ETF
Fund
S000070901 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
279,316 | ||
| 17.2 |
Dimensional US Small Cap Value ETF
Fund
S000075151 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
197,730 | ||
| 17.3 |
U.S. Targeted Value Portfolio
Fund
S000000970 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
178,917 | ||
| 17.4 |
U.S. MICRO CAP PORTFOLIO
Fund
S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
141,736 | ||
| 17.5 |
U.S. SMALL CAP PORTFOLIO
Fund
S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
121,715 | ||
| 18 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,372,300 | ||
| 18.1 |
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund
S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
56,874 | ||
| 18.2 |
Goldman Sachs Small Cap Value Insights Fund
Fund
S000014929 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
55,217 | ||
| 18.3 |
Goldman Sachs Small Cap Equity Insights Fund
Fund
S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
40,343 | ||
| 18.4 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
|
619 | ||
| 19 |
ROYCE & ASSOCIATES LP
13F
CIK 906304 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,323,218 | ||
| 19.1 |
Royce Small-Cap Opportunity Fund
Fund
S000009512 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
624,319 | ||
| 20 |
Avantis U.S. Small Cap Value ETF
Fund
S000066459 · Registered fund · May 31, 2026
American Century ETF Trust, not summed
|
1,319,932 | ||
| 21 |
AQR CAPITAL MANAGEMENT LLC
13F
CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,276,346 | ||
| 21.1 |
AQR Small Cap Multi-Style Fund
Fund
S000040064 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
44,820 | ||
| 22 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,190,616 | ||
| 23 |
MARSHALL WACE, LLP
13F
CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,146,707 | ||
| 24 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,066,501 | ||
| 25 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,004,383 | ||
| 26 |
Telemark Asset Management, LLC
13F
CIK 1420816 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,000,000 | ||
| 27 |
BNP PARIBAS ARBITRAGE, SA
13F
CIK 1166588 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
867,199 | ||
| 28 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
810,429 | ||
| 29 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
779,468 | ||
| 30 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
698,983 | ||
| 31 |
ACADIAN ASSET MANAGEMENT LLC
13F
CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
684,915 | ||
| 32 |
|
637,834 | ||
| 33 |
Federated Hermes MDT Small Cap Core Fund
Fund
S000012972 · Registered fund · Jul 31, 2026
Federated Hermes MDT Series, not summed
|
603,353 | ||
| 34 |
FEDERATED HERMES, INC.
13F
CIK 1056288 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
596,883 | ||
| 35 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
570,712 | ||
| 35.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
331,366 | ||
| 35.2 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
166,006 | ||
| 35.3 |
Schwab U.S. Broad Market ETF
Fund
S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
38,919 | ||
| 35.4 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
34,000 | ||
| 36 |
TUDOR INVESTMENT CORP ET AL
13F
CIK 923093 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
567,384 | ||
| 37 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
565,569 | ||
| 37.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
32,337 | ||
| 37.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
3,125 | ||
| 38 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
474,393 | ||
| 39 |
PANAGORA ASSET MANAGEMENT INC
13F
CIK 883677 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
442,448 | ||
| 40 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
397,075 | ||
| 41 |
DEUTSCHE BANK AG\
13F
CIK 948046 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
372,077 | ||
| 41.1 |
DWS Global Small Cap Fund
Fund
S000005468 · Registered fund · Jul 31, 2026
DEUTSCHE DWS GLOBAL/INTERNATIONAL FUND, INC., not summed
|
206,899 | ||
| 41.2 |
DWS Global Small Cap VIP
Fund
S000006246 · Registered fund · Jun 30, 2026
DEUTSCHE DWS VARIABLE SERIES I, not summed
|
79,715 | ||
| 41.3 |
DWS Small Cap Index VIP
Fund
S000006223 · Registered fund · Jun 30, 2026
DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
|
10,669 | ||
| 42 |
Baird Financial Group, Inc.
13F
CIK 1648711 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
345,193 | ||
| 43 |
VANGUARD RUSSELL 2000 INDEX FUND
Fund
S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
|
340,787 | ||
| 44 |
Clearwater Select Equity Fund
Fund
S000000698 · Registered fund · Jun 30, 2026
Clearwater Investment Trust, not summed
|
334,930 | ||
| 45 |
ALGERT GLOBAL LLC
13F
CIK 1275218 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
302,582 | ||
| 46 |
Trexquant Investment LP
13F
CIK 1633445 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
302,439 | ||
| 47 |
Y-Intercept (Hong Kong) Ltd
13F
CIK 1772875 · Exempt reporting adviser · Sep 30, 2026
|
275,553 | ||
| 48 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
274,392 | ||
| 49 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
252,746 | ||
| 50 |
Multi-Manager Small Cap Equity Strategies Fund
Fund
S000036206 · Registered fund · May 31, 2026
COLUMBIA FUNDS SERIES TRUST I, not summed
|
241,835 |
19 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
Showing 1–50 of 271 holders
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Key facts
CIK
1145986
CUSIP
04523Y105
13F (30d)
14 filings
14 filers
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