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 Q2	$19.7M	Sell	582,744 -6,050	-1%	-$199K	0.96%	36
2026 Q1	$18.8M	Buy	588,794 +31,600	+6%	+$1.03M	1.11%	29
2025 Q4	$19.5M	Sell	557,194 -38,735	-6%	-$1.41M	1%	31
2025 Q3	$16.9M	Buy	595,929 +59,818	+11%	+$1.43M	0.99%	35
2025 Q2	$9.71M	Hold	536,111	–	–	0.61%	54
2025 Q1	$11M	Sell	536,111 -231,411	-30%	-$5.14M	0.63%	49
2024 Q4	$19.7M	Buy	767,522 +414,203	+117%	+$8.8M	0.75%	46
2024 Q3	$5.87M	Buy	+353,319	New	+$6.11M	0.19%	80

Other funds holding NAMS

FLSM

Frazier Life Sciences Management Palo Alto, California $4.59B AUM 237.58% 1-Year Est. Return

Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return

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

Deerfield Management New York $9.59B AUM 113.36% 1-Year Est. Return

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

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

Rock Springs Capital Management's NAMS Position: Q2 2026 in Review

Rock Springs Capital Management reduced its NewAmsterdam Pharma (NAMS) stake by 1% in Q2 2026, selling an estimated $199K and leaving 582,744 shares worth $19.7M. The position accounts for 0.96% of the portfolio, ranked #36.

Rock Springs Capital Management first reported a position in NAMS in Q3 2024 and has held it in 8 quarters since. 195 funds tracked by Wall St. Rank hold NAMS as of Q2 2026.

Rock Springs Capital Management held 582,744 shares of NewAmsterdam Pharma worth $19.7M as of Q2 2026.
Rock Springs Capital Management sold 6,050 NewAmsterdam Pharma shares in Q2 2026, an estimated $199K.
NewAmsterdam Pharma made up 0.96% of Rock Springs Capital Management's portfolio in Q2 2026, its #36 holding.
Rock Springs Capital Management first reported a position in NewAmsterdam Pharma in Q3 2024 and has held it in 8 quarters since.
195 funds tracked by Wall St. Rank held NewAmsterdam Pharma as of Q2 2026.

Based on Rock Springs Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.