CABA
Cabaletta Bio, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth -6.2% ·
share flow +10.8% ·
net new positions -6.7%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 67 | +17 | 94.18M | $292.87M | +24 | −6 |
| Q1 2026 | 49 | +1 | 47.68M | $128.08M | +7 | −6 |
| Q4 2025 | 47 | +1 | 39.89M | $87.37M | +1 | — |
| Q3 2025 | 15 | -1 | 24.60M | $57.56M | — | −1 |
| Q2 2025 | 13 | 0 | 19.37M | $29.44M | — | — |
| Q1 2025 | 10 | -1 | 6.81M | $9.44M | +2 | −3 |
| Q4 2024 | 11 | 0 | 9.36M | $21.24M | +1 | −1 |
| Q3 2024 | 10 | +2 | 7.88M | $37.20M | +2 | — |
| Q2 2024 | 8 | — | 6.49M | $48.56M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Adage Capital Partners ✦ | 8.83M | 0.0% | $20.66M | 0.0% | Held | 6 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 4.19M | +21.4% | $9.81M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 4.19M | +21.4% | $9.81M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 4.19M | +21.4% | $9.81M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 1.62M | +67.0% | $3.79M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 1.62M | +67.0% | $3.79M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 1.62M | +67.0% | $3.79M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 1.62M | +67.0% | $3.79M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | Morgan Stanley ✦ | 1.47M | — | $3.45M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | Morgan Stanley ✦ | 1.47M | — | $3.45M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | Morgan Stanley ✦ | 1.47M | — | $3.45M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | Morgan Stanley ✦ | 1.47M | — | $3.45M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | Morgan Stanley ✦ | 1.47M | — | $3.45M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | Morgan Stanley ✦ | 1.47M | — | $3.45M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | Renaissance Technologies ✦ | 1.34M | +962.2% | $3.13M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 16 | Marshall Wace ✦ | 1.33M | +594.4% | $3.10M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 17 | Marshall Wace ✦ | 1.33M | +594.4% | $3.10M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 18 | T. Rowe Price ✦ | 1.29M | -40.8% | $3.03M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 19 | T. Rowe Price ✦ | 1.29M | -40.8% | $3.03M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 20 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 26 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 27 | JPMorgan Chase ✦ | 1.08M | — | $2.52M | 0.0% | n/c | 1 | SEC ↗ |
| 28 | Geode Capital Management ✦ (passive) | 920.34K | +66.3% | $2.15M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 29 | Geode Capital Management ✦ (passive) | 920.34K | +66.3% | $2.15M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 30 | Citadel Advisors ✦ | 705.47K | -58.2% | $1.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 31 | Millennium Management ✦ | 686.81K | -19.7% | $1.61M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 32 | Two Sigma Investments ✦ | 470.48K | +86.4% | $1.10M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 33 | State Street Global Advisors ✦ (passive) | 376.80K | +72.9% | $881,712 | 0.0% | ▲ Add | 4 | SEC ↗ |
| 34 | Goldman Sachs Group ✦ | 272.60K | — | $637,874 | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Goldman Sachs Group ✦ | 272.60K | — | $637,874 | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Fidelity (FMR) ✦ | 14.06K | -9.0% | $32,910 | 0.0% | ▼ Trim | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| AQR Capital Management | $48,836 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 107 holders, 84.67M shares, $194.86M 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.