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ACLX · Arcellx, Inc.

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$115.07 +0.00 (+0.00%) At close · Apr 29
Market Cap
$6.73B
Shares
58.48M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 211
Total Value: $6,299,101,301
Total Shares: 54,860,677
Showing 1–100 of 231 holdings by value · page 1 of 3

Institutional Ownership Trend

18 quarters

Superinvestors Holding ACLX

All superinvestors →
George Soros $22,964,000

Holder Concentration

Across 241 13F filers
Top Holder
12.1%
Jun 2023 → Mar 2026 · range 9.5% – 15.7%
of institutional value
Top 5
40.3%
Jun 2023 → Mar 2026 · range 40.0% – 45.7%
of institutional value
Top 10
61.2%
Jun 2023 → Mar 2026 · range 61.2% – 67.8%
of institutional value
HHI
494
Jun 2023 → Mar 2026 · range 484 – 612
Broadly held
Showing 100 of 231
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mid GILEAD SCIENCES, INC. $771,682,600 12.25% 6,720,803
Mid Paradigm Biocapital Advisors LP $662,972,517 10.52% 5,774,016
Mega BlackRock, Inc. $452,992,218 7.19% 3,945,238
Mid NEA Management Company, LLC $349,656,982 5.55% 3,045,262
Large Pentwater Capital Management LP $329,533,400 5.23% 2,870,000
Mega VANGUARD CAPITAL MANAGEMENT LLC $278,463,530 4.42% 2,425,218
Small SR One Capital Management, LP $269,440,056 4.28% 2,346,630
Mega FIL Ltd $268,586,025 4.26% 2,339,192
Mid HBK INVESTMENTS L P $261,619,321 4.15% 2,278,517
Mega T. Rowe Price Investment Management, Inc. $259,019,911 4.11% 2,255,878
Mega STATE STREET CORP $192,426,263 3.05% 1,675,895
Mid GLAZER CAPITAL, LLC $173,048,436 2.75% 1,507,128
Mega GOLDMAN SACHS GROUP INC $150,661,636 2.39% 1,312,155
Mega GEODE CAPITAL MANAGEMENT, LLC $118,111,429 1.88% 1,028,666
Mega MORGAN STANLEY $106,301,845 1.69% 925,813
Mega JPMORGAN CHASE & CO $68,154,048 1.08% 593,573
Mid Davidson Kempner Capital Management LP $64,258,324 1.02% 559,644
Mega ALLIANCEBERNSTEIN L.P. $62,488,144 0.99% 544,227
Mid TIG Advisors, LLC $62,161,021 0.99% 541,378
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $58,328,560 0.93% 508,000
Mega MILLENNIUM MANAGEMENT LLC $57,736,777 0.92% 502,846
Large Balyasny Asset Management L.P. $55,086,387 0.87% 479,763
Large TUDOR INVESTMENT CORP ET AL $53,114,354 0.84% 462,588
Mega BANK OF AMERICA CORP /DE/ Bank $51,936,872 0.82% 452,333
Mid Magnetar Financial LLC $45,345,977 0.72% 394,931
Mid ALPINE ASSOCIATES MANAGEMENT INC. $43,401,960 0.69% 378,000
Mid NEXPOINT ASSET MANAGEMENT, L.P. $42,845,082 0.68% 373,150
Mid Affinity Asset Advisors, LLC $41,652,562 0.66% 362,764
Mega NORTHERN TRUST CORP Bank $40,194,461 0.64% 350,065
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $39,738,283 0.63% 346,092
Mega VANGUARD FIDUCIARY TRUST CO Bank $35,427,251 0.56% 308,546
Large Qube Research & Technologies Ltd $34,887,712 0.55% 303,847
Mid First Trust Capital Management L.P. $27,354,142 0.43% 238,235
Mid AQR Arbitrage LLC $26,607,238 0.42% 231,730
Large Caption Management, LLC $25,834,500 0.41% 225,000
Micro AJU IB Investment Co., Ltd. $25,660,662 0.41% 223,486
Large LMR Partners LLP $24,398,675 0.39% 212,495
Mega BARCLAYS PLC $23,841,453 0.38% 207,642
Mid SOROS FUND MANAGEMENT LLC $22,964,000 0.36% 200,000
Large GABELLI FUNDS LLC $22,493,238 0.36% 195,900
Mega UBS Group AG $22,356,486 0.35% 194,709
Large Verition Fund Management LLC $21,511,986 0.34% 187,354
Small WATER ISLAND CAPITAL LLC $21,059,021 0.33% 183,409
Large Man Group plc $20,667,599 0.33% 180,000
Mid Rock Springs Capital Management LP $19,503,210 0.31% 169,859
Small GABELLI & Co INVESTMENT ADVISERS, INC. $17,498,568 0.28% 152,400
Mega BNP PARIBAS ARBITRAGE, SA $17,401,889 0.28% 151,558
Mid Groupe la Francaise $17,343,101 0.28% 151,046
Mega Bank of New York Mellon Corp Bank $16,430,623 0.26% 143,099
Large Woodline Partners LP $14,208,975 0.23% 123,750
Small GARDNER LEWIS ASSET MANAGEMENT L P $14,145,479 0.22% 123,197
Large Hudson Bay Capital Management LP $14,111,378 0.22% 122,900
Mid PICTON MAHONEY ASSET MANAGEMENT $13,778,400 0.22% 120,000
Mega FMR LLC $13,706,980 0.22% 119,378
Small Slotnik Capital, LLC $13,548,760 0.22% 118,000
Mid ODDO BHF ASSET MANAGEMENT SAS $13,204,300 0.21% 115,000
Mid PRELUDE CAPITAL MANAGEMENT, LLC $11,349,842 0.18% 98,849
Large RENAISSANCE TECHNOLOGIES LLC $11,068,648 0.18% 96,400
Mega JANUS HENDERSON GROUP PLC $10,365,949 0.16% 90,280
Small CIBRA Capital Ltd $10,175,692 0.16% 88,623
Mega Nuveen, LLC $9,793,456 0.16% 85,294
Mega DEUTSCHE BANK AG\ Bank $9,261,839 0.15% 80,664
Mid Cinctive Capital Management LP $9,185,600 0.15% 80,000
Mid PICTON MAHONEY ASSET MANAGEMENT $8,611,500 0.14% 75,000
Mid Sagefield Capital LP $7,474,437 0.12% 65,097
Small Athos Capital Ltd $7,451,818 0.12% 64,900
Large Russell Investments Group, Ltd. $7,107,931 0.11% 61,905
Mid SAMSARA BIOCAPITAL, LLC $6,989,437 0.11% 60,873
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $6,577,919 0.10% 57,289
Mid Voleon Capital Management LP $6,512,590 0.10% 56,720
Small PSquared Asset Management AG $6,343,919 0.10% 55,251
Mega Swiss National Bank Bank $6,280,654 0.10% 54,700
Small Twin Securities, Inc. Broker-Dealer $6,198,213 0.10% 53,982
Mid Susquehanna Portfolio Strategies, LLC $5,848,701 0.09% 50,938
Small HARVEST MANAGEMENT LLC $5,741,000 0.09% 50,000
Mega Invesco Ltd. $5,428,688 0.09% 47,280
Mega PRICE T ROWE ASSOCIATES INC /MD/ $5,276,438 0.08% 45,954
Mega RHUMBLINE ADVISERS $5,191,127 0.08% 45,211
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $5,155,418 0.08% 44,900
Small Maven Securities LTD Broker-Dealer $4,879,850 0.08% 42,500
Large Rafferty Asset Management, LLC $4,528,615 0.07% 39,441
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $4,005,610 0.06% 34,886
Mid ADAR1 Capital Management, LLC $3,683,884 0.06% 32,084
Micro FIFTH LANE CAPITAL, LP $3,564,472 0.06% 31,044
Mega JANE STREET GROUP, LLC $3,536,456 0.06% 30,800
Large DekaBank Deutsche Girozentrale Bank $3,444,600 0.05% 30,000
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $3,444,600 0.05% 30,000
Mega GOLDMAN SACHS GROUP INC $3,214,960 0.05% 28,000
Mega VANGUARD ASSET MANAGEMENT, Ltd $3,159,961 0.05% 27,521
Large Squarepoint Ops LLC $3,116,788 0.05% 27,145
Mid New York Life Investment Management LLC $3,013,221 0.05% 26,243
Mega GOLDMAN SACHS GROUP INC $2,870,500 0.05% 25,000
Large Caption Management, LLC $2,870,500 0.05% 25,000
Large SG Americas Securities, LLC Broker-Dealer $2,837,546 0.05% 24,713
Large NOMURA HOLDINGS INC $2,836,054 0.05% 24,700
Large NOMURA HOLDINGS INC $2,836,054 0.05% 24,700
Small Yakira Capital Management, Inc. $2,755,680 0.04% 24,000
Mid Skandinaviska Enskilda Banken AB (publ) $2,755,680 0.04% 24,000
Mega JANE STREET GROUP, LLC $2,640,860 0.04% 23,000
Mega Legal & General Group Plc $2,513,178 0.04% 21,888
Key facts CIK 1786205 CUSIP 03940C100 13F (30d) 2 filings 2 filers Visit website Investor relations

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