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Rock Springs Capital Management’s NewAmsterdam Pharma NAMS Stock Holding History

Rock Springs Capital Management’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
Q1 		– Sell
-31,600
Closed -$1.11M – 104
2025
Q4 		$1.11M Hold
31,600
– – 0.06% 95
2025
Q3 		$899K Buy
+31,600
New +$757K 0.05% 85

Other funds holding NAMS

FLSM
Frazier Life Sciences Management Palo Alto, California $3.89B AUM 201.1% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $9.44B AUM 157.3% 1-Year Est. Return
FIS
FCPM III Services Naarden, Netherlands $722M AUM 73.61% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.11B AUM 171.34% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
DM
Deerfield Management New York $8.48B AUM 99.04% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
DFO
Duquesne Family Office New York $3.38B AUM 61.92% 1-Year Est. Return

Rock Springs Capital Management's NAMS Position: Q1 2026 in Review

Rock Springs Capital Management increased its NewAmsterdam Pharma (NAMS) stake by 5.7% in Q1 2026, buying an estimated $1.03M and bringing the position to 588,794 shares worth $18.8M. The position accounts for 1.11% of the portfolio, ranked #29.

Rock Springs Capital Management first reported a position in NAMS in Q3 2024 and has held it in 7 quarters since. The position peaked at $19.7M in Q4 2024. 171 funds tracked by Wall St. Rank hold NAMS as of Q1 2026.

  • Rock Springs Capital Management held 588,794 shares of NewAmsterdam Pharma worth $18.8M as of Q1 2026.
  • Rock Springs Capital Management bought 31,600 NewAmsterdam Pharma shares in Q1 2026, an estimated $1.03M.
  • NewAmsterdam Pharma made up 1.11% of Rock Springs Capital Management's portfolio in Q1 2026, its #29 holding.
  • Rock Springs Capital Management first reported a position in NewAmsterdam Pharma in Q3 2024 and has held it in 7 quarters since.
  • Rock Springs Capital Management's NewAmsterdam Pharma position peaked at $19.7M in Q4 2024.
  • 171 funds tracked by Wall St. Rank held NewAmsterdam Pharma as of Q1 2026.

Based on Rock Springs Capital Management's 13F filing for Q1 2026, filed 15 May 2026.