RSCM
ACLX

Rock Springs Capital Management’s Arcellx ACLX Stock Holding History

Rock Springs Capital Management’s Portfolio ACLX Stock Details ACLX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$19.5M Hold
169,859
– – 1.15% 28
2025
Q4 		$11.1M Sell
169,859
-9,123
-5% -$728K 0.57% 51
2025
Q3 		$14.7M Sell
178,982
-7,332
-4% -$528K 0.86% 42
2025
Q2 		$12.3M Buy
+186,314
New +$11.6M 0.76% 46

Other funds holding ACLX

GS
Gilead Sciences Foster City, California $1.65B AUM 166.99% 1-Year Est. Return
PBA
Paradigm Biocapital Advisors New York $4.89B AUM 251.12% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.76B AUM 223.33% 1-Year Est. Return
PCM
Pentwater Capital Management Naples, Florida $19.3B AUM 58.13% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
SOCM
SR One Capital Management Wayne, Pennsylvania $915M AUM 209.71% 1-Year Est. Return
Fidelity International
Fidelity International Hamilton, Bermuda $129B AUM 30.83% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return

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

Rock Springs Capital Management held its Arcellx (ACLX) position steady in Q1 2026 at 169,859 shares worth $19.5M. The position accounts for 1.15% of the portfolio, ranked #28.

Rock Springs Capital Management first reported a position in ACLX in Q2 2025 and has held it in 4 quarters since. 239 funds tracked by Wall St. Rank hold ACLX as of Q1 2026.

  • Rock Springs Capital Management held 169,859 shares of Arcellx worth $19.5M as of Q1 2026.
  • Rock Springs Capital Management left its Arcellx share count unchanged in Q1 2026.
  • Arcellx made up 1.15% of Rock Springs Capital Management's portfolio in Q1 2026, its #28 holding.
  • Rock Springs Capital Management first reported a position in Arcellx in Q2 2025 and has held it in 4 quarters since.
  • 239 funds tracked by Wall St. Rank held Arcellx as of Q1 2026.

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