BlackRock
ACLX

BlackRock’s Arcellx ACLX Stock Holding History

BlackRock’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 		$453M Buy
3,945,238
+396,451
+11% +$35M 0.01% 1189
2025
Q4 		$231M Buy
3,548,787
+160,891
+5% +$12.8M ﹤0.01% 1587
2025
Q3 		$278M Sell
3,387,896
-80,288
-2% -$5.78M ﹤0.01% 1463
2025
Q2 		$228M Sell
3,468,184
-499,385
-13% -$31.1M ﹤0.01% 1546
2025
Q1 		$260M Buy
3,967,569
+113,548
+3% +$7.69M 0.01% 1442
2024
Q4 		$296M Sell
3,854,021
-392,671
-9% -$33.9M 0.01% 1429
2024
Q3 		$355M Buy
4,246,692
+730,328
+21% +$48.6M 0.01% 1315
2024
Q2 		$194M Buy
3,516,364
+450,296
+15% +$24.5M ﹤0.01% 1636
2024
Q1 		$213M Buy
3,066,068
+47,530
+2% +$3.01M 0.01% 1606
2023
Q4 		$168M Buy
3,018,538
+310,876
+11% +$14M ﹤0.01% 1760
2023
Q3 		$97.2M Buy
2,707,662
+105,177
+4% +$3.63M ﹤0.01% 2010
2023
Q2 		$82.3M Buy
2,602,485
+380,128
+17% +$14.5M ﹤0.01% 2176
2023
Q1 		$68.5M Buy
2,222,357
+15,178
+0.7% +$460K ﹤0.01% 2252
2022
Q4 		$68.4M Buy
2,207,179
+401,076
+22% +$9.2M ﹤0.01% 2254
2022
Q3 		$33.9M Buy
1,806,103
+1,203,592
+200% +$23M ﹤0.01% 2726
2022
Q2 		$10.9M Buy
602,511
+102,406
+20% +$1.32M ﹤0.01% 3465
2022
Q1 		$7.01M Buy
+500,105
New +$8.36M ﹤0.01% 3774

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
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
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

BlackRock's ACLX Position: Q1 2026 in Review

BlackRock increased its Arcellx (ACLX) stake by 11% in Q1 2026, buying an estimated $35M and bringing the position to 3,945,238 shares worth $453M. The position accounts for 0.01% of the portfolio, ranked #1189.

BlackRock first reported a position in ACLX in Q1 2022 and has held it in 17 quarters since. 239 funds tracked by Wall St. Rank hold ACLX as of Q1 2026.

  • BlackRock held 3,945,238 shares of Arcellx worth $453M as of Q1 2026.
  • BlackRock bought 396,451 Arcellx shares in Q1 2026, an estimated $35M.
  • Arcellx made up 0.01% of BlackRock's portfolio in Q1 2026, its #1189 holding.
  • BlackRock first reported a position in Arcellx in Q1 2022 and has held it in 17 quarters since.
  • 239 funds tracked by Wall St. Rank held Arcellx as of Q1 2026.

Based on BlackRock's 13F filing for Q1 2026, filed 13 May 2026.