RCM
ACLX

RA Capital Management’s Arcellx ACLX Stock Holding History

RA 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 		– Sell
-1,267,156
Closed -$82.6M – 86
2025
Q4 		$82.6M Sell
1,267,156
-1,769,371
-58% -$141M 0.85% 24
2025
Q3 		$249M Hold
3,036,527
– – 3.07% 11
2025
Q2 		$200M Hold
3,036,527
– – 3.37% 6
2025
Q1 		$199M Buy
3,036,527
+249,200
+9% +$16.9M 3.33% 6
2024
Q4 		$214M Buy
2,787,327
+935,848
+51% +$80.8M 2.84% 9
2024
Q3 		$155M Buy
1,851,479
+247,465
+15% +$16.5M 1.78% 16
2024
Q2 		$88.5M Buy
+1,604,014
New +$87.2M 1.17% 25

Other funds holding ACLX

GS
Gilead Sciences Foster City, California $2.12B AUM 143.53% 1-Year Est. Return
PBA
Paradigm Biocapital Advisors New York $4.89B AUM 251.12% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 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

RA Capital Management's ACLX Position: Q1 2026 in Review

RA Capital Management sold out of Arcellx (ACLX) in Q1 2026, closing a stake of 1,267,156 shares — an estimated $82.6M sold.

RA Capital Management first reported a position in ACLX in Q2 2024 and held it in 7 quarters. The position peaked at $249M in Q3 2025. 239 funds tracked by Wall St. Rank hold ACLX as of Q1 2026.

  • RA Capital Management reported no remaining Arcellx position as of Q1 2026 after selling out during the quarter.
  • RA Capital Management sold 1,267,156 Arcellx shares in Q1 2026, an estimated $82.6M.
  • RA Capital Management first reported a position in Arcellx in Q2 2024 and held it in 7 quarters.
  • RA Capital Management's Arcellx position peaked at $249M in Q3 2025.
  • 239 funds tracked by Wall St. Rank held Arcellx as of Q1 2026.

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