Based on 1663 hedge funds · latest filing: 2025 Q4 · updated quarterly
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Buying streak — 11 quarters in a row
For 11 consecutive quarters, more hedge funds added BSX than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.
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At the ownership peak (100% of max)
100% of all-time peak
1,663 hedge funds hold BSX right now — the highest count in 3.0 years. When ownership is this concentrated, any bad news can trigger a chain reaction: one big fund sells, others follow. This is a classic 'crowded trade' — high popularity doesn't equal safety.
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Steady growth — +19% more funds vs a year ago
fund count last 6Q
+266 new funds entered over the past year (+19% YoY). Gradual, steady growth in institutional ownership is generally a healthy signal — not a speculative rush, but consistent conviction.
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Slight buying edge — 51% buying
856 buying807 selling
Last quarter: 856 funds bought or added vs 807 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.
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More new buyers each quarter (+51 vs last Q)
new funds entering per quarter
Funds opening a new BSX position: 219 → 150 → 172 → 223. A growing influx of new institutional buyers means the asset is still gathering momentum — the consensus hasn't fully saturated yet.
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58% of holders stayed for 2+ years
■ 58% conviction (2yr+)
■ 23% medium
■ 18% new
971 out of 1,663 hedge funds have held BSX for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.
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Steady discovery — ~223 new funds/quarter
181 → 219 → 150 → 172 → 223 new funds/Q
New funds entering each quarter: 219 → 150 → 172 → 223. Consistent flow of new institutional buyers without clear acceleration or slowdown.
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Deep conviction — 61% of holders stayed 2+ years
■ 61% veterans
■ 14% 1-2yr
■ 25% new
Of 1,730 current holders: 1,049 (61%) have held for over 2 years without selling. These are not momentum buyers — they have lived through drawdowns and stayed. A large veteran base acts as a stabilizing force during selloffs.
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Elite ownership — 53% AUM from top-100 funds
53% from top-100 AUM funds
49 of 1663 holders are among the 100 largest funds by AUM, controlling 53% of total institutional value in BSX. When the biggest players dominate the cap table, it signifies deep institutional support — since mega-funds deploy the most rigorous due diligence and capital.
Exit risk score 3.6/10 — low institutional crowding. Ownership is below peak levels, holder base is relatively sticky, and buying momentum is positive.