SEI Investments
ACLX

SEI Investments’s Arcellx ACLX Stock Holding History

SEI Investments’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 		$516K Sell
4,492
-11,176
-71% -$986K ﹤0.01% 2646
2025
Q4 		$1.02M Buy
15,668
+12,773
+441% +$1.02M ﹤0.01% 2174
2025
Q3 		$238K Buy
+2,895
New +$208K ﹤0.01% 2557
2025
Q1 		– Sell
-9,688
Closed -$743K – 2759
2024
Q4 		$743K Buy
9,688
+4,827
+99% +$417K ﹤0.01% 2050
2024
Q3 		$406K Sell
4,861
-95
-2% -$6.33K ﹤0.01% 2248
2024
Q2 		$274K Sell
4,956
-9,880
-67% -$537K ﹤0.01% 2374
2024
Q1 		$1.03M Buy
14,836
+3,951
+36% +$251K ﹤0.01% 1872
2023
Q4 		$604K Buy
+10,885
New +$491K ﹤0.01% 2036
2023
Q3 		– Sell
-10,941
Closed -$346K – 2616
2023
Q2 		$346K Sell
10,941
-9,004
-45% -$344K ﹤0.01% 2280
2023
Q1 		$615K Sell
19,945
-5,173
-21% -$157K ﹤0.01% 2052
2022
Q4 		$778K Sell
25,118
-784
-3% -$18K ﹤0.01% 1848
2022
Q3 		$486K Sell
25,902
-811
-3% -$15.5K ﹤0.01% 2096
2022
Q2 		$483K Buy
+26,713
New +$345K ﹤0.01% 2113

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

SEI Investments's ACLX Position: Q1 2026 in Review

SEI Investments reduced its Arcellx (ACLX) stake by 71% in Q1 2026, selling an estimated $986K and leaving 4,492 shares worth $516K. The position accounts for ﹤0.01% of the portfolio, ranked #2646.

SEI Investments first reported a position in ACLX in Q2 2022 and has held it in 13 quarters since. The position peaked at $1.03M in Q1 2024. 239 funds tracked by Wall St. Rank hold ACLX as of Q1 2026.

  • SEI Investments held 4,492 shares of Arcellx worth $516K as of Q1 2026.
  • SEI Investments sold 11,176 Arcellx shares in Q1 2026, an estimated $986K.
  • Arcellx made up ﹤0.01% of SEI Investments's portfolio in Q1 2026, its #2646 holding.
  • SEI Investments first reported a position in Arcellx in Q2 2022 and has held it in 13 quarters since.
  • SEI Investments's Arcellx position peaked at $1.03M in Q1 2024.
  • 239 funds tracked by Wall St. Rank held Arcellx as of Q1 2026.

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