Jane Street
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Jane Street’s NewAmsterdam Pharma NAMS Stock Holding History

Jane Street’s Portfolio NAMS Stock Details NAMS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$16.1M Buy
474,236
+309,035
+187% +$10.2M ﹤0.01% 2354
2026
Q1 		$5.29M Sell
165,201
-256,290
-61% -$8.35M ﹤0.01% 3426
2025
Q4 		$14.8M Buy
+421,491
New +$15.3M ﹤0.01% 1882

Other funds holding NAMS

FLSM
Frazier Life Sciences Management Palo Alto, California $4.59B AUM 237.58% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
FIS
FCPM III Services Naarden, Netherlands $750M AUM 127.27% 1-Year Est. Return
DM
Deerfield Management New York $9.59B AUM 113.36% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 1-Year Est. Return
MC
Maverick Capital Dallas, Texas $11.3B AUM 76.6% 1-Year Est. Return
DFO
Duquesne Family Office New York $5.21B AUM 87.01% 1-Year Est. Return

Jane Street's NAMS Position: Q2 2026 in Review

Jane Street increased its NewAmsterdam Pharma (NAMS) stake by 187% in Q2 2026, buying an estimated $10.2M and bringing the position to 474,236 shares worth $16.1M. The position accounts for ﹤0.01% of the portfolio, ranked #2354.

Jane Street first reported a position in NAMS in Q4 2025 and has held it in 3 quarters since. 195 funds tracked by Wall St. Rank hold NAMS as of Q2 2026.

  • Jane Street held 474,236 shares of NewAmsterdam Pharma worth $16.1M as of Q2 2026.
  • Jane Street bought 309,035 NewAmsterdam Pharma shares in Q2 2026, an estimated $10.2M.
  • NewAmsterdam Pharma made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #2354 holding.
  • Jane Street first reported a position in NewAmsterdam Pharma in Q4 2025 and has held it in 3 quarters since.
  • 195 funds tracked by Wall St. Rank held NewAmsterdam Pharma as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.