Based on 647 hedge funds · latest filing: 2025 Q4 · updated quarterly
📈
Buying streak — 10 quarters in a row
For 10 consecutive quarters, more hedge funds added INSM 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.
🏔️
At the ownership peak (100% of max)
100% of all-time peak
647 hedge funds hold INSM 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 — +54% more funds vs a year ago
fund count last 6Q
+228 new funds entered over the past year (+54% 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.
🟢
More buyers than sellers — 61% buying
429 buying278 selling
Last quarter: 429 funds were net buyers (191 opened a brand new position + 238 added to an existing one). Only 278 were sellers (192 trimmed + 86 sold completely). A clear majority buying is a strong confirmation signal.
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More new buyers each quarter (+66 vs last Q)
new funds entering per quarter
Funds opening a new INSM position: 59 → 125 → 125 → 191. A growing influx of new institutional buyers means the asset is still gathering momentum — the consensus hasn't fully saturated yet.
📌
Mixed — 35% long-term, 42% new
■ 35% conviction (2yr+)
■ 23% medium
■ 42% new
Of the 647 current holders: 226 (35%) held >2 years, 149 held 1–2 years, and 272 entered in the last year. A mixed base — the stock has long-term believers but also recent buyers who haven't been tested by a downturn yet.
💰
Value +21% but shares only +0% — price-driven
Last quarter: the total dollar value of institutional holdings rose +21%, but actual share count only changed +0%. The gap is explained by the stock's price rising — not new buying. Strong value growth with weak share growth means the rally is price momentum, not fresh institutional demand.
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Acceleration phase — new buyers rushing in
63 → 59 → 125 → 125 → 191 new funds/Q
New funds entering each quarter: 59 → 125 → 125 → 191. 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.
🏛️
Deep conviction — 42% of holders stayed 2+ years
■ 42% veterans
■ 15% 1-2yr
■ 44% new
Of 691 current holders: 288 (42%) 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 — 47% AUM from top-100 funds
47% from top-100 AUM funds
44 of 647 holders are among the 100 largest funds by AUM, controlling 47% of total institutional value in INSM. When the biggest players dominate the cap table, it signifies deep institutional support — since mega-funds deploy the most rigorous due diligence and capital.
4.7
out of 10
Moderate Exit Risk
Exit risk score 4.7/10 — some crowding factors present, but no critical concentration. Watch ownership trend over the next 1–2 quarters for direction.