GOSS
Gossamer Bio, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth +12.5% ·
share flow -4.4% ·
net new positions +11.1%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 61 | -10 | 149.99M | $24.69M | +3 | −13 |
| Q1 2026 | 73 | -3 | 96.26M | $32.15M | +6 | −9 |
| Q4 2025 | 76 | -1 | 88.23M | $273.50M | — | −1 |
| Q3 2025 | 18 | +3 | 53.94M | $141.87M | +3 | — |
| Q2 2025 | 12 | 0 | 44.92M | $55.25M | +1 | −1 |
| Q1 2025 | 9 | +1 | 11.42M | $12.56M | +1 | — |
| Q4 2024 | 8 | 0 | 11.95M | $10.80M | — | — |
| Q3 2024 | 7 | 0 | 18.68M | $18.44M | — | — |
| Q2 2024 | 7 | — | 23.16M | $20.86M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Millennium Management ✦ | 2.68M | -25.3% | $2.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 2 | Geode Capital Management ✦ (passive) | 2.27M | +1.0% | $2.50M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 2.27M | +1.0% | $2.50M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 4 | Marshall Wace ✦ | 1.71M | -32.4% | $1.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 5 | Marshall Wace ✦ | 1.71M | -32.4% | $1.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 6 | Marshall Wace ✦ | 1.71M | -32.4% | $1.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 7 | Renaissance Technologies ✦ | 1.57M | -8.4% | $1.73M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 8 | Two Sigma Investments ✦ | 1.28M | +43.1% | $1.40M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 9 | State Street Global Advisors ✦ (passive) | 882.68K | +14.9% | $970,944 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | Arrowstreet Capital ✦ | 803.82K | New | $884,197 | 0.0% | New | 1 | SEC ↗ |
| 11 | Citadel Advisors ✦ | 156.93K | +12.1% | $172,625 | 0.0% | ▲ Add | 4 | SEC ↗ |
| 12 | T. Rowe Price ✦ | 64.78K | 0.0% | $72,000 | 0.0% | Held | 4 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Arrowstreet Capital | $884,197 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 1 holders, 2.17M shares, $845,282 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.