Whale Tracker
Institutional flow into US biotech, ranked by conviction. 13F holdings and Form 4 insider buys, scored by relative size, cluster behaviour, sector divergence, and the whale's historical accuracy.
Sub-sector Flow
Net inflow / outflow from tracked whales, $M
last 30 days
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Conviction-ranked whale moves
Whale Leaderboard
Top by 6-month win rate
Tip: click any signal on the left for the full conviction-score breakdown, the whale's other recent positions, and a direct link to the underlying SEC filing.
How the Conviction Score is calculated
How the Conviction Score is calculated
Composite 0–100 score blending six factors. Volume confirmation is dropped for delayed 13F filings and the remaining weights re-normalise.
- Relative Size (25%) — move value as % of whale AUM, capped at 5%.
- Win Rate (20%) — 40% 6-month + 60% 12-month alpha vs XBI.
- Cluster Boost (20%) — ≥2 whales same ticker within ±5 days. Capped to prevent late-quarter herding inflation.
- Sector Divergence (15%) — sub-sector 5-day drawdown when whale was buying.
- Specialization (10%) — biotech share of AUM × specialist multiplier.
- Volume Confirmation (10%) — sigma at filing date. Real-time signals only.
Strategic vs Routine: every move passes three gates — size ≥0.5% AUM or ≥10% of prior position, whale's portfolio turnover ≥20%, and not the 3rd+ consecutive same-direction quarter.