Based on 684 hedge funds · latest filing: 2025 Q4 · updated quarterly
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Buying streak — 3 quarters in a row
For 3 consecutive quarters, more hedge funds added NBIX 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
684 hedge funds hold NBIX 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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Fast accumulation — +22% more funds vs a year ago
fund count last 6Q
+125 new funds entered over the past year (+22% YoY). That's a rapid rush of institutional money. Fast accumulation often signals a major thesis — but it also means the stock could fall quickly if that thesis breaks.
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More buyers than sellers — 60% buying
403 buying264 selling
Last quarter: 403 funds were net buyers (135 opened a brand new position + 268 added to an existing one). Only 264 were sellers (211 trimmed + 53 sold completely). A clear majority buying is a strong confirmation signal.
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More new buyers each quarter (+20 vs last Q)
new funds entering per quarter
Funds opening a new NBIX position: 71 → 75 → 115 → 135. 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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59% of holders stayed for 2+ years
■ 59% conviction (2yr+)
■ 18% medium
■ 23% new
402 out of 684 hedge funds have held NBIX 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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Acceleration phase — new buyers rushing in
104 → 71 → 75 → 115 → 135 new funds/Q
New funds entering each quarter: 71 → 75 → 115 → 135. The pace of institutional discovery is accelerating sharply. This is the 'hot idea' phase — the thesis is being passed from fund to fund. You are not late — the accumulation wave is still building.
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Deep conviction — 62% of holders stayed 2+ years
■ 62% veterans
■ 11% 1-2yr
■ 26% new
Of 702 current holders: 438 (62%) 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 — 48% AUM from top-100 funds
48% from top-100 AUM funds
44 of 684 holders are among the 100 largest funds by AUM, controlling 48% of total institutional value in NBIX. 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 3.9/10 — low institutional crowding. Ownership is below peak levels, holder base is relatively sticky, and buying momentum is positive.