ASPN · Aspen Aerogels Inc
Market Cap
$408.30M
Shares
82.99M
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: 181
Total Value: $469,567,428
Total Shares: 74,064,280
Showing 1–100
of 187 holdings by value
· page 1 of 2
Institutional Ownership Trend
26 quarters
Holder Concentration
Across 181 13F filers · Δ vs Mar 31, 2026Top Holder
16.6%
−1.0 pts
Top 5
39.9%
−3.2 pts
Top 10
56.2%
−2.9 pts
HHI
527
Broadly held−49
Quarterly Activity
vs Mar 31, 2026
New
38
Increased
61
Decreased
48
Sold Out
26
Unchanged
34
Holder count:
+12
Institutional value:
+96.2%
Shares held:
+5.8%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega AMERICAN CENTURY COMPANIES INC | +1,262,259 | 2,510,042 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC | +839,304 | 2,058,083 | |
| Mega AQR CAPITAL MANAGEMENT LLC | +750,227 | 1,276,346 | |
| Mega BlackRock, Inc. | +534,072 | 5,277,148 | |
| Mega GOLDMAN SACHS GROUP INC | +472,787 | 1,372,300 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid NEEDHAM INVESTMENT MANAGEMENT LLC | −1,257,975 | 3,260,800 | |
| Mega Invesco Ltd. | −678,211 | 1,619,972 | |
| Mega CITADEL ADVISORS LLC | −328,456 | 481,731 | |
| Small GAGNON SECURITIES LLC | −326,039 | 1,535,812 | |
| Small Palogic Value Management, L.P. | −264,411 | 185,589 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Large ACADIAN ASSET MANAGEMENT LLC | 684,915 | $4,342,361 | |
| Large Baird Financial Group, Inc. | 345,193 | $2,188,523 | |
| Large Trexquant Investment LP | 302,439 | $1,917,463 | |
| Large RENAISSANCE TECHNOLOGIES LLC | 274,392 | $1,739,645 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 171,150 | $1,085,091 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large HRT FINANCIAL LP | 870,435 | $2,976,887 | |
| Small Samjo Management, LLC | 645,625 | $2,208,037 | |
| Mid Engineers Gate Manager LP | 148,159 | $506,703 | |
| Large LAZARD ASSET MANAGEMENT LLC | 141,745 | $484,767 | |
| Large ALPS ADVISORS INC | 124,353 | $425,287 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Small KIM, LLC | $77,857,900 | 16.58% | 12,280,426 | Shares | 2026-08-13 | |
| Mega BlackRock, Inc. | $33,457,114 | 7.13% | 5,277,148 | Shares | 2026-08-07 | |
| Mid OAKTOP CAPITAL MANAGEMENT II, L.P. | $32,769,393 | 6.98% | 5,168,674 | Shares | 2026-08-07 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $22,438,978 | 4.78% | 3,539,271 | Shares | 2026-08-13 | |
| Mid NEEDHAM INVESTMENT MANAGEMENT LLC | $20,673,472 | 4.40% | 3,260,800 | Shares | 2026-08-14 | |
| Small George Kaiser Family Foundation Endowment | $20,080,821 | 4.28% | 3,167,322 | Shares | 2026-08-12 | |
| Mega STATE STREET CORP | $16,227,198 | 3.46% | 2,559,495 | Shares | 2026-08-07 | |
| Mega AMERICAN CENTURY COMPANIES INC | $15,913,666 | 3.39% | 2,510,042 | Shares | 2026-08-12 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC | $13,048,246 | 2.78% | 2,058,083 | Shares | 2026-08-14 | |
| Mega AMERIPRISE FINANCIAL INC | $11,547,009 | 2.46% | 1,821,295 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $11,224,493 | 2.39% | 1,770,425 | Shares | 2026-08-12 | |
| Mid RICE HALL JAMES & ASSOCIATES, LLC | $10,367,542 | 2.21% | 1,635,259 | Shares | 2026-08-07 | |
| Mega Invesco Ltd. | $10,270,622 | 2.19% | 1,619,972 | Shares | 2026-08-14 | |
| Small GAGNON SECURITIES LLC Broker-Dealer | $9,737,048 | 2.07% | 1,535,812 | Shares | 2026-08-05 | |
| Mega DIMENSIONAL FUND ADVISORS LP | $9,176,089 | 1.95% | 1,447,333 | Shares | 2026-08-11 | |
| Mega GOLDMAN SACHS GROUP INC | $8,700,381 | 1.85% | 1,372,300 | Shares | 2026-08-14 | |
| Large ROYCE & ASSOCIATES LP | $8,389,202 | 1.79% | 1,323,218 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC | $8,092,030 | 1.72% | 1,276,346 | Shares | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC | $7,548,505 | 1.61% | 1,190,616 | Shares | 2026-08-14 | |
| Large MARSHALL WACE, LLP | $7,270,121 | 1.55% | 1,146,707 | Shares | 2026-08-13 | |
| Mega D. E. Shaw & Co., Inc. | $6,761,616 | 1.44% | 1,066,501 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO | $6,367,787 | 1.36% | 1,004,383 | Shares | 2026-08-12 | |
| Mid Telemark Asset Management, LLC | $6,340,000 | 1.35% | 1,000,000 | Shares | 2026-08-10 | |
| Mega BNP PARIBAS ARBITRAGE, SA | $5,498,041 | 1.17% | 867,199 | Shares | 2026-08-13 | |
| Mega TWO SIGMA INVESTMENTS, LP | $4,941,827 | 1.05% | 779,468 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | $4,431,552 | 0.94% | 698,983 | Shares | 2026-08-13 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $4,342,361 | 0.92% | 684,915 | Shares | 2026-08-13 | |
| Large FEDERATED HERMES, INC. | $3,784,237 | 0.81% | 596,883 | Shares | 2026-08-12 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $3,618,314 | 0.77% | 570,712 | Shares | 2026-08-14 | |
| Large TUDOR INVESTMENT CORP ET AL | $3,597,214 | 0.77% | 567,384 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $3,585,705 | 0.76% | 565,569 | Shares | 2026-08-13 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $3,007,651 | 0.64% | 474,393 | Shares | 2026-08-13 | |
| Large PANAGORA ASSET MANAGEMENT INC | $2,805,120 | 0.60% | 442,448 | Shares | 2026-08-06 | |
| Mega MORGAN STANLEY | $2,517,453 | 0.54% | 397,075 | Shares | 2026-08-13 | |
| Mega DEUTSCHE BANK AG\ Bank | $2,358,966 | 0.50% | 372,077 | Shares | 2026-08-07 | |
| Large Baird Financial Group, Inc. | $2,188,523 | 0.47% | 345,193 | Shares | 2026-08-12 | |
| Mid ALGERT GLOBAL LLC | $1,918,369 | 0.41% | 302,582 | Shares | 2026-08-13 | |
| Large Trexquant Investment LP | $1,917,463 | 0.41% | 302,439 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC | $1,739,645 | 0.37% | 274,392 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $1,602,409 | 0.34% | 252,746 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $1,513,554 | 0.32% | 238,731 | Shares | 2026-09-02 | |
| Large PRUDENTIAL FINANCIAL INC | $1,457,787 | 0.31% | 229,935 | Shares | 2026-08-12 | |
| Mid XTX Topco Ltd | $1,445,374 | 0.31% | 227,977 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP | $1,409,711 | 0.30% | 222,352 | Shares | 2026-08-11 | |
| Mega Bank of New York Mellon Corp Bank | $1,238,763 | 0.26% | 195,389 | Shares | 2026-08-06 | |
| Small Palogic Value Management, L.P. | $1,176,634 | 0.25% | 185,589 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $1,155,148 | 0.25% | 182,200 | Call | 2026-09-02 | |
| Mega CITIGROUP INC | $1,151,665 | 0.25% | 181,651 | Shares | 2026-08-03 | |
| Small IRONWOOD INVESTMENT MANAGEMENT LLC | $1,136,768 | 0.24% | 179,301 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1,124,836 | 0.24% | 177,419 | Shares | 2026-08-14 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $1,085,091 | 0.23% | 171,150 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $1,074,630 | 0.23% | 169,500 | Call | 2026-08-14 | |
| Mid Jump Financial, LLC | $1,070,603 | 0.23% | 168,865 | Shares | 2026-08-13 | |
| Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension | $997,916 | 0.21% | 157,400 | Shares | 2026-08-13 | |
| Mega Nuveen, LLC | $921,353 | 0.20% | 145,324 | Shares | 2026-08-11 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $911,058 | 0.19% | 143,700 | Call | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $826,102 | 0.18% | 130,300 | Shares | 2026-08-14 | |
| Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension | $812,198 | 0.17% | 128,107 | Shares | 2026-08-17 | |
| Large Jefferies Financial Group Inc. | $800,761 | 0.17% | 126,303 | Shares | 2026-08-17 | |
| Micro Firsthand Capital Management, Inc. | $792,500 | 0.17% | 125,000 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $762,736 | 0.16% | 120,306 | Shares | 2026-08-06 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $697,400 | 0.15% | 110,000 | Shares | 2026-08-14 | |
| Mega Mitsubishi UFJ Asset Management Co., Ltd. | $681,581 | 0.15% | 107,505 | Shares | 2026-08-07 | |
| Small Sargent Investment Group, LLC | $674,778 | 0.14% | 106,432 | Shares | 2026-08-11 | |
| Mid Inspire Investing, LLC | $674,132 | 0.14% | 106,330 | Shares | 2026-08-12 | |
| Large IEQ CAPITAL, LLC | $655,004 | 0.14% | 103,313 | Shares | 2026-08-11 | |
| Mid RBF Capital, LLC | $634,000 | 0.14% | 100,000 | Shares | 2026-08-14 | |
| Large Man Group plc | $572,242 | 0.12% | 90,259 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS | $528,343 | 0.11% | 83,335 | Shares | 2026-08-12 | |
| Mega ALLIANCEBERNSTEIN L.P. | $469,984 | 0.10% | 74,130 | Shares | 2026-08-14 | |
| Mega LPL Financial LLC | $439,774 | 0.09% | 69,365 | Shares | 2026-08-07 | |
| Mega FMR LLC | $434,137 | 0.09% | 68,476 | Shares | 2026-08-13 | |
| Small EntryPoint Capital, LLC | $429,813 | 0.09% | 67,794 | Shares | 2026-08-13 | |
| Mega UBS Group AG | $422,693 | 0.09% | 66,671 | Shares | 2026-08-13 | |
| Mid OPPENHEIMER & CO INC | $408,486 | 0.09% | 64,430 | Shares | 2026-08-03 | |
| Mid WINTON GROUP Ltd | $388,008 | 0.08% | 61,200 | Shares | 2026-08-07 | |
| Mega CITADEL ADVISORS LLC | $385,472 | 0.08% | 60,800 | Put | 2026-09-02 | |
| Mega WELLS FARGO & COMPANY/MN | $376,405 | 0.08% | 59,370 | Shares | 2026-08-14 | |
| Mid Centiva Capital, LP | $357,950 | 0.08% | 56,459 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $309,392 | 0.07% | 48,800 | Put | 2026-08-14 | |
| Mega FRANKLIN RESOURCES INC | $303,730 | 0.06% | 47,907 | Shares | 2026-08-13 | |
| Mid Graham Capital Management, L.P. | $293,332 | 0.06% | 46,267 | Shares | 2026-08-14 | |
| Mid Arax Advisory Partners | $292,610 | 0.06% | 46,153 | Shares | 2026-08-10 | |
| Mid Quantbot Technologies LP | $288,038 | 0.06% | 45,432 | Shares | 2026-08-12 | |
| Large Balyasny Asset Management L.P. | $277,165 | 0.06% | 43,717 | Shares | 2026-08-14 | |
| Large Mariner, LLC | $270,413 | 0.06% | 42,652 | Shares | 2026-08-13 | |
| Small Odyssean, LLC | $264,752 | 0.06% | 41,759 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC | $255,305 | 0.05% | 40,269 | Shares | 2026-08-14 | |
| Large MERCER GLOBAL ADVISORS INC /ADV | $245,224 | 0.05% | 38,679 | Shares | 2026-08-19 | |
| Small State of Wyoming | $240,920 | 0.05% | 38,000 | Shares | 2026-08-06 | |
| Small FOX RUN MANAGEMENT, L.L.C. | $240,406 | 0.05% | 37,919 | Shares | 2026-08-04 | |
| Mid Y-Intercept (Hong Kong) Ltd | $233,438 | 0.05% | 36,820 | Shares | 2026-07-14 | |
| Small Dynamic Technology Lab Private Ltd | $222,553 | 0.05% | 35,103 | Shares | 2026-08-13 | |
| Mega SG Americas Securities, LLC Broker-Dealer | $217,772 | 0.05% | 34,349 | Shares | 2026-08-07 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD | $210,785 | 0.04% | 33,247 | Shares | 2026-08-14 | |
| Mid Diversified Trust Co Bank | $209,517 | 0.04% | 33,047 | Shares | 2026-07-17 | |
| Mega JANE STREET GROUP, LLC | $206,684 | 0.04% | 32,600 | Put | 2026-08-14 | |
| Mid Concurrent Investment Advisors, LLC | $203,197 | 0.04% | 32,050 | Shares | 2026-07-27 | |
| Large Creative Planning | $199,278 | 0.04% | 31,432 | Shares | 2026-08-13 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund | $198,258 | 0.04% | 31,271 | Shares | 2026-08-14 |
Key facts
CIK
1145986
CUSIP
04523Y105
13F (30d)
145 filings
145 filers
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