Based on 849 hedge funds · latest filing: 2025 Q4 · updated quarterly
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Selling streak — 2 quarters in a row
For 2 consecutive quarters, more hedge funds reduced or closed their ZS positions than added to them. Sustained institutional selling is a meaningful warning sign — these are professionals with deep research teams collectively deciding to exit.
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At the ownership peak (97% of max)
97% of all-time peak
849 hedge funds hold ZS 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
+134 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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More sellers than buyers — 49% buying
459 buying476 selling
Last quarter: 476 funds reduced or exited vs 459 that bought or added. When more than half of active funds are selling, it's a caution flag — especially if the stock price hasn't moved down yet.
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More new buyers each quarter (+21 vs last Q)
new funds entering per quarter
Funds opening a new ZS position: 115 → 215 → 123 → 144. 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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56% of holders stayed for 2+ years
■ 56% conviction (2yr+)
■ 23% medium
■ 21% new
479 out of 849 hedge funds have held ZS 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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Peak discovery — momentum slowing
140 → 115 → 215 → 123 → 144 new funds/Q
New funds entering each quarter: 115 → 215 → 123 → 144. ZS is well-known in the hedge fund world, but fresh entries are gradually declining. The explosive phase of institutional discovery is likely behind us.
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Deep conviction — 61% of holders stayed 2+ years
■ 61% veterans
■ 11% 1-2yr
■ 28% new
Of 916 current holders: 562 (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 — 50% AUM from top-100 funds
50% from top-100 AUM funds
49 of 849 holders are among the 100 largest funds by AUM, controlling 50% of total institutional value in ZS. 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.