ASPN
Aspen Aerogels, Inc. · Basic Materials · Chemicals - Specialty
Momentum inputs (comparable managers):
holder breadth +7.7% ·
share flow -4.0% ·
net new positions +7.1%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| 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 | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 4.98M | — | $29.46M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | The Vanguard Group ✦ (passive) | 4.49M | — | $26.57M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | The Vanguard Group ✦ (passive) | 4.49M | — | $26.57M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | The Vanguard Group ✦ (passive) | 4.49M | — | $26.57M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 4.49M | — | $26.57M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 4.49M | — | $26.57M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | State Street Global Advisors ✦ (passive) | 1.92M | +28.6% | $11.37M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | Geode Capital Management ✦ (passive) | 1.58M | +4.4% | $9.37M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 22 | Geode Capital Management ✦ (passive) | 1.58M | +4.4% | $9.37M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | Millennium Management ✦ | 906.75K | -43.3% | $5.37M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 24 | Two Sigma Investments ✦ | 771.31K | -14.4% | $4.57M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 25 | Renaissance Technologies ✦ | 679.20K | -11.1% | $4.02M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 26 | Marshall Wace ✦ | 404.01K | +32.1% | $2.39M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 27 | Marshall Wace ✦ | 404.01K | +32.1% | $2.39M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 28 | AQR Capital Management ✦ | 189.83K | +26.4% | $1.12M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 29 | AQR Capital Management ✦ | 189.83K | +26.4% | $1.12M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 30 | AQR Capital Management ✦ | 189.83K | +26.4% | $1.12M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 31 | AQR Capital Management ✦ | 189.83K | +26.4% | $1.12M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 32 | Fidelity (FMR) ✦ | 169.21K | — | $1.00M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Citadel Advisors ✦ | 163.03K | -71.8% | $965,149 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 34 | T. Rowe Price ✦ | 70.88K | +6.8% | $420,000 | 0.0% | ▲ Add | 5 | SEC ↗ |
| 35 | D. E. Shaw & Co. ✦ | 20.72K | -16.4% | $122,674 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 36 | Gotham Asset Management ✦ | 10.40K | New | $61,544 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Gotham Asset Management | $61,544 | 0.0% |
Exited
| No tracked exits this quarter. |
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.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.