Security record
ASPN
Aspen Aerogels, Inc. · Basic Materials · Chemicals - Specialty
76Tracked holders
+3Δ holders
36.34MShares held
$229.77MReported value
+8New positions
−5Exits
Momentum inputs (comparable managers):
holder breadth +4.1% ·
share flow +11.2% ·
net new positions +3.9%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 76 | +3 | 36.34M | $229.77M | +8 | −5 |
| Q1 2026 | 75 | +4 | 32.71M | $111.61M | +13 | −9 |
| Q4 2025 | 71 | -2 | 36.38M | $102.97M | — | −2 |
| Q3 2025 | 17 | 0 | 22.22M | $154.67M | +1 | −1 |
| Q2 2025 | 14 | +1 | 16.35M | $96.82M | +1 | — |
| Q1 2025 | 10 | 0 | 7.40M | $47.29M | +2 | −2 |
| Q4 2024 | 10 | -2 | 7.79M | $92.59M | +1 | −3 |
| Q3 2024 | 11 | +2 | 2.29M | $63.46M | +2 | — |
| Q2 2024 | 9 | — | 3.76M | $89.60M | — | — |
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 5.28M | +11.3% | $33.46M | 0.0% | ▲ Add | 5 | SEC ↗ ×9 |
| 2 | Vanguard Capital Management Llc | 3.54M | +3.0% | $22.44M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | State Street Global Advisors ✦ (passive) | 2.56M | +10.3% | $16.23M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 4 | American Century Companies Inc | 2.51M | +101.2% | $15.91M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 5 | Ameriprise Financial Inc | 1.82M | +20.9% | $11.55M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 6 | Geode Capital Management ✦ (passive) | 1.77M | +14.9% | $11.23M | 0.0% | ▲ Add | 9 | SEC ↗ ×2 |
| 7 | Invesco Ltd. | 1.62M | -29.5% | $10.27M | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 8 | Dimensional Fund Advisors Lp | 1.45M | +15.2% | $9.17M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 9 | Goldman Sachs Group ✦ | 1.37M | +52.6% | $8.70M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 10 | AQR Capital Management ✦ | 1.28M | +142.6% | $8.09M | 0.0% | ▲ Add | 6 | SEC ↗ ×9 |
| 11 | Millennium Management ✦ | 1.19M | -15.2% | $7.55M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 12 | Marshall Wace ✦ | 1.15M | -9.2% | $7.27M | 0.0% | ▼ Trim | 9 | SEC ↗ ×3 |
| 13 | D. E. Shaw & Co. ✦ | 1.07M | +27.9% | $6.76M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 14 | JPMorgan Chase ✦ | 1.00M | +4.0% | $6.01M | 0.0% | ▲ Add | 4 | SEC ↗ ×3 |
| 15 | Bnp Paribas Financial Markets | 867.20K | +24.2% | $5.50M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 16 | Two Sigma Investments ✦ | 779.47K | +76.6% | $4.94M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 17 | Federated Hermes, Inc. | 596.88K | +32.6% | $3.78M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 18 | Charles Schwab Investment… | 570.71K | +2.5% | $3.62M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | Tudor Investment Corp Et Al | 567.38K | +275.5% | $3.60M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | Northern Trust Corp | 565.57K | +8.1% | $3.59M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 21 | Morgan Stanley ✦ | 397.07K | +110.9% | $2.52M | 0.0% | ▲ Add | 4 | SEC ↗ ×7 |
| 22 | Deutsche Bank Ag\ | 372.08K | +3.5% | $2.36M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 23 | Baird Financial Group, Inc. | 345.19K | New | $2.19M | 0.0% | New | 1 | SEC ↗ |
| 24 | Renaissance Technologies ✦ | 274.39K | New | $1.74M | 0.0% | New | 1 | SEC ↗ |
| 25 | Bank Of America Corp /De/ | 252.75K | +4.9% | $1.60M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 26 | Citadel Advisors ✦ | 238.73K | -58.9% | $1.51M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 27 | Prudential Financial Inc | 229.94K | +2164.2% | $1.46M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 28 | First Trust Advisors Lp | 222.35K | +22.7% | $1.41M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 29 | Bank of New York Mellon Corp | 195.39K | +5.2% | $1.24M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 30 | Citigroup Inc | 181.65K | -22.3% | $1.15M | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 31 | Susquehanna International Group, Llp | 177.42K | -35.3% | $1.12M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 32 | Arrowstreet Capital ✦ | 171.15K | New | $1.09M | 0.0% | New | 1 | SEC ↗ |
| 33 | Healthcare Of Ontario Pension Plan… | 157.40K | 0.0% | $997,916 | 0.0% | Held | 3 | SEC ↗ |
| 34 | Nuveen, LLC | 145.32K | +7.9% | $921,354 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 35 | T. Rowe Price ✦ | 130.30K | +21.4% | $827,000 | 0.0% | ▲ Add | 9 | SEC ↗ |
| 36 | Russell Investments Group, Ltd. | 120.31K | +5.2% | $762,737 | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 37 | Mitsubishi UFJ Asset Management… | 107.50K | -15.7% | $681,582 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 38 | Man Group plc | 90.26K | -37.0% | $572,242 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 39 | Rhumbline Advisers | 83.33K | -0.8% | $528,333 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 40 | LPL Financial LLC | 69.36K | +78.5% | $439,774 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 41 | Fidelity (FMR) ✦ | 68.48K | +1428.8% | $434,135 | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 42 | UBS Group AG | 66.67K | -64.8% | $422,694 | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 43 | Wells Fargo & Company/Mn | 59.37K | +107.7% | $376,406 | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 44 | Franklin Resources Inc | 47.91K | -24.0% | $303,730 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 45 | Balyasny Asset Management L.P. | 43.72K | -70.7% | $277,166 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 46 | Mariner, LLC | 42.65K | New | $270,424 | 0.0% | New | 1 | SEC ↗ |
| 47 | Alliancebernstein L.P. | 74.13K | +15.7% | $253,525 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 48 | Mercer Global Advisors Inc /Adv | 38.68K | New | $245,225 | 0.0% | New | 1 | SEC ↗ |
| 49 | State Of Wisconsin Investment Board | 33.25K | -67.6% | $210,786 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 50 | Creative Planning | 31.43K | New | $199,279 | 0.0% | New | 1 | SEC ↗ |
| 51 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 31.27K | -0.9% | $198,258 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 52 | Cerity Partners LLC | 28.36K | +179.4% | $179,834 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 53 | Wealth Enhancement Advisory… | 30.39K | +175.6% | $156,792 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 54 | Canada Pension Plan Investment Board | 20.70K | -13.0% | $131,238 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 55 | Captrust Financial Advisors | 19.19K | New | $121,646 | 0.0% | New | 1 | SEC ↗ |
| 56 | Manufacturers Life Insurance… | 19.06K | +4.1% | $120,815 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 57 | Bank Of Montreal /Can/ | 17.30K | +12.3% | $109,682 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 58 | Barclays Plc | 16.95K | -8.1% | $107,494 | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 59 | Squarepoint Ops LLC | 16.46K | -72.5% | $104,356 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 60 | New York State Common Retirement… | 16.23K | 0.0% | $102,905 | 0.0% | Held | 3 | SEC ↗ |
| 61 | Simplex Trading, Llc | 15.95K | +572.0% | $101,135 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 62 | State Board Of Administration Of… | 14.62K | 0.0% | $92,678 | 0.0% | Held | 3 | SEC ↗ |
| 63 | Voya Investment Management Llc | 13.77K | +18.6% | $87,295 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 64 | Hsbc Holdings Plc | 13.85K | -86.8% | $86,399 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 65 | Quantinno Capital Management LP | 10.33K | New | $65,518 | 0.0% | New | 1 | SEC ↗ |
| 66 | Osaic Holdings, Inc. | 9.59K | -51.1% | $60,780 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 67 | Point72 Asset Management ✦ | 9.01K | -96.5% | $57,098 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 68 | Legal & General Group Plc | 6.92K | +14.6% | $43,876 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 69 | Optiver Holding B.V. | 3.17K | -24.6% | $20,098 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 70 | Royal Bank Of Canada | 3.16K | -62.9% | $20,000 | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 71 | Rockefeller Capital Management L.P. | 1.65K | +723.0% | $10,436 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 72 | Us Bancorp \De\ | 1.43K | +107.7% | $9,085 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 73 | Jones Financial Companies Lllp | 1.50K | -7.4% | $8,445 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 74 | Pnc Financial Services Group, Inc. | 185 | +3.9% | $1,173 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 75 | Fifth Third Bancorp | 28 | -50.0% | $175 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 76 | TD Waterhouse Canada Inc. | 15 | 0.0% | $89 | 0.0% | Held | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Baird Financial Group, Inc. | $2.19M | 0.0% |
| Renaissance Technologies | $1.74M | 0.0% |
| Arrowstreet Capital | $1.09M | 0.0% |
| Mariner, LLC | $270,424 | 0.0% |
| Mercer Global Advisors Inc… | $245,225 | 0.0% |
| Creative Planning | $199,279 | 0.0% |
| Captrust Financial Advisors | $121,646 | 0.0% |
| Quantinno Capital Management… | $65,518 | 0.0% |
Exited
| Hrt Financial Lp | $2.98M | was 0.0% |
| Jane Street Group, Llc | $642,482 | was 0.0% |
| Lazard Asset Management Llc | $484,768 | was 0.0% |
| IMC-Chicago, LLC | $76,847 | was 0.0% |
| National Bank Of Canada /Fi/ | $3,420 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 164 holders, 68.34M shares, $229.58M reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Sep 23
Wood River Capital, LLC
Other · 12.28M sh · $58.09M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Sep 24
SC 13D/A — Wood River Capital, LLC
Aug 13
SC 13G/A — NEEDHAM INVESTMENT MANAGEMENT LLC
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2026 ·
Methodology ·
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