TECX
Tectonic Therapeutic, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth -7.7% ·
share flow +0.9% ·
net new positions -8.3%
· formula
Concentrated accumulation: rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 57 | +6 | 7.73M | $265.79M | +9 | −3 |
| Q1 2026 | 53 | +3 | 7.56M | $233.65M | +10 | −7 |
| Q4 2025 | 50 | 0 | 8.28M | $172.63M | +1 | −1 |
| Q3 2025 | 14 | -1 | 5.97M | $93.62M | n/a | −1 |
| Q2 2025 | 12 | -1 | 5.17M | $102.64M | n/a | −1 |
| Q1 2025 | 10 | +6 | 971.81K | $17.19M | +6 | n/a |
| Q4 2024 | 4 | 0 | 181.96K | $8.40M | +1 | −1 |
| Q3 2024 | 3 | 0 | 144.81K | $4.39M | n/a | n/a |
| Q2 2024 | 3 | n/a | 134.61K | $2.22M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 2.80M | n/a | $55.65M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 2 | BlackRock ✦ (passive) | 761.30K | n/a | $15.13M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 3 | The Vanguard Group ✦ (passive) | 584.39K | n/a | $11.61M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 4 | Geode Capital Management ✦ (passive) | 272.26K | +242.5% | $5.41M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 5 | Point72 Asset Management ✦ | 231.03K | +15.5% | $4.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 6 | Citadel Advisors ✦ | 165.05K | +76.6% | $3.28M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 7 | State Street Global Advisors ✦ (passive) | 131.04K | +325.4% | $2.60M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | Renaissance Technologies ✦ | 86.99K | -39.7% | $1.73M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 9 | Millennium Management ✦ | 74.89K | -68.5% | $1.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 10 | Wellington Management ✦ | 28.55K | +45.2% | $567,189 | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 11 | T. Rowe Price ✦ | 18.32K | +43.1% | $365,000 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 12 | Marshall Wace ✦ | 10.68K | -80.0% | $212,172 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
“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
| Adage Capital Partners | $1.77M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 110 holders, 13.75M shares, $410.16M 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.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 43 sh · $1,570
Officer · 43 sh · $1,505
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology