Janus Henderson Group
ACLX

Janus Henderson Group’s Arcellx ACLX Stock Holding History

Janus Henderson Group’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 		$10.4M Sell
90,280
-829,298
-90% -$73.2M 0.01% 754
2025
Q4 		$60M Sell
919,578
-94,343
-9% -$7.53M 0.03% 379
2025
Q3 		$83.2M Sell
1,013,921
-9,661
-0.9% -$696K 0.04% 304
2025
Q2 		$67.4M Sell
1,023,582
-486,912
-32% -$30.3M 0.03% 334
2025
Q1 		$103M Sell
1,510,494
-46,598
-3% -$3.16M 0.06% 260
2024
Q4 		$119M Sell
1,557,092
-454,858
-23% -$39.3M 0.06% 257
2024
Q3 		$168M Buy
2,011,950
+109,332
+6% +$7.28M 0.09% 208
2024
Q2 		$105M Buy
1,902,618
+380,309
+25% +$20.7M 0.06% 256
2024
Q1 		$106M Sell
1,522,309
-15,901
-1% -$1.01M 0.06% 257
2023
Q4 		$85.4M Sell
1,538,210
-237,228
-13% -$10.7M 0.05% 273
2023
Q3 		$63.7M Buy
1,775,438
+21,191
+1% +$731K 0.04% 317
2023
Q2 		$55.5M Buy
1,754,247
+166,995
+11% +$6.38M 0.03% 370
2023
Q1 		$48.9M Sell
1,587,252
-84,895
-5% -$2.58M 0.03% 384
2022
Q4 		$51.8M Sell
1,672,147
-652,071
-28% -$15M 0.04% 363
2022
Q3 		$43.7M Buy
2,324,218
+1,069,409
+85% +$20.5M 0.02% 536
2022
Q2 		$22.7M Buy
+1,254,809
New +$16.2M 0.02% 542

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

Janus Henderson Group's ACLX Position: Q1 2026 in Review

Janus Henderson Group reduced its Arcellx (ACLX) stake by 90% in Q1 2026, selling an estimated $73.2M and leaving 90,280 shares worth $10.4M. The position accounts for 0.01% of the portfolio, ranked #754.

Janus Henderson Group first reported a position in ACLX in Q2 2022 and has held it in 16 quarters since. The position peaked at $168M in Q3 2024. 239 funds tracked by Wall St. Rank hold ACLX as of Q1 2026.

  • Janus Henderson Group held 90,280 shares of Arcellx worth $10.4M as of Q1 2026.
  • Janus Henderson Group sold 829,298 Arcellx shares in Q1 2026, an estimated $73.2M.
  • Arcellx made up 0.01% of Janus Henderson Group's portfolio in Q1 2026, its #754 holding.
  • Janus Henderson Group first reported a position in Arcellx in Q2 2022 and has held it in 16 quarters since.
  • Janus Henderson Group's Arcellx position peaked at $168M in Q3 2024.
  • 239 funds tracked by Wall St. Rank held Arcellx as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.