Arcellx, Inc.
ACLXDelisted Apr 28, 2026- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001786205
Arcellx, Inc. was delisted on Apr 28, 2026; its insiders filed their last Form 4 on Apr 28, 2026; 240 institutions reported holding it in 13F filings for Q1 2026, worth $6.52B in total; Soros Fund Management was the only superinvestor holding it.
13F holders, Q1 2026
Institutional positions in Arcellx, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
ACLX is no longer listed, so this page shows Q1 2026. 13F filings for later quarters list far fewer holders.
- Institutional holders
- 240
- +26 vs. Q4 2025
- Shares held
- 57.0M
- −5.51M (−8.8%) vs. Q4 2025
- Total value
- $6.52B
- +$2.44B (+59.9%) vs. Q4 2025
- New holders
- 97
- 62 more added
- Sold out
- 71
- 56 more reduced
4 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ACLX on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 2 | $3.43M |
| Q1 2026 | 240 | $6.52B |
| Q4 2025 | 218 | $4.34B |
| Q3 2025 | 209 | $5.18B |
| Q2 2025 | 203 | $4.01B |
| Q1 2025 | 198 | $4.04B |
| Q4 2024 | 211 | $4.54B |
| Q3 2024 | 186 | $4.13B |
| Q2 2024 | 167 | $2.77B |
| Q1 2024 | 183 | $3.27B |
| Q4 2023 | 156 | $2.59B |
| Q3 2023 | 136 | $1.71B |
| Q2 2023 | 138 | $1.52B |
| Q1 2023 | 117 | $1.40B |
| Q4 2022 | 125 | $1.30B |
| Q3 2022 | 74 | $781.8M |
| Q2 2022 | 68 | $621.5M |
| Q1 2022 | 49 | $357.9M |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Arcellx, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Gilead Sciences, Inc. | 6,720,803 | $771.7M | 36.44% | 00.0% | Unchanged |
| Paradigm Biocapital Advisors LP | 5,774,016 | $663.0M | 13.55% | +50,000+0.9% | Added |
| BlackRock, Inc. | 3,945,238 | $453.0M | 0.01% | +396,451+11.2% | Added |
| NEA Management Company, LLC | 3,045,262 | $349.7M | 19.88% | 00.0% | Unchanged |
| Pentwater Capital Management LP | 2,870,000 | $329.5M | 2.34% | +2,870,000 | New |
| Vanguard Capital Management LLC | 2,425,218 | $278.5M | 0.01% | +2,425,218 | New |
| Vanguard Portfolio Management LLC | 2,424,818 | $278.4M | 0.01% | +2,424,818 | New |
| Sr One Capital Management, LP | 2,346,630 | $269.4M | 29.43% | 00.0% | Unchanged |
| FIL Ltd | 2,339,192 | $268.6M | 0.21% | +2,339,192 | New |
| HBK Investments L P | 2,278,517 | $261.6M | 3.29% | +2,278,517 | New |
| T. Rowe Price Investment Management, Inc. | 2,255,878 | $259.0M | 0.18% | −8,304,547−78.6% | Reduced |
| State Street Corp | 1,675,895 | $192.4M | 0.01% | −322,608−16.1% | Reduced |
| Glazer Capital, LLC | 1,507,128 | $173.0M | 3.68% | +1,507,128 | New |
| Goldman Sachs Group Inc | 1,312,155 | $150.7M | 0.02% | +643,675+96.3% | Added |
| Geode Capital Management, LLC | 1,028,666 | $118.1M | 0.01% | +70,609+7.4% | Added |
| Morgan Stanley | 925,813 | $106.3M | 0.01% | +407,409+78.6% | Added |
| JPMorgan Chase & Co | 593,573 | $68.1M | 0.00% | −860,904−59.2% | Reduced |
| Davidson Kempner Capital Management LP | 559,644 | $64.3M | 1.14% | +559,644 | New |
| TIG Advisors, LLC | 541,378 | $62.2M | 2.97% | +541,378 | New |
| Millennium Management LLC | 502,846 | $57.7M | 0.04% | +494,025+5,600.6% | Added |
| Balyasny Asset Management LLC | 479,763 | $55.1M | 0.11% | +479,763 | New |
| Tudor Investment Corp Et Al | 462,588 | $53.1M | 0.29% | +416,559+905.0% | Added |
| Bank of America Corp | 452,333 | $51.9M | 0.00% | +24,564+5.7% | Added |
| O'Connor Alternative Investments LLC | 450,504 | $51.7M | 2.71% | +450,504 | New |
| Magnetar Financial LLC | 394,931 | $45.3M | 0.46% | +394,931 | New |
| Alpine Associates Management Inc. | 378,000 | $43.4M | 2.56% | +378,000 | New |
| Highland Capital Management Fund Advisors, L.P. | 373,150 | $42.8M | 2.99% | +373,150 | New |
| Affinity Asset Advisors, LLC | 362,764 | $41.7M | 2.44% | −160,961−30.7% | Reduced |
| Northern Trust Corp | 350,065 | $40.2M | 0.01% | +28,272+8.8% | Added |
| Charles Schwab Investment Management Inc | 346,092 | $39.7M | 0.01% | +6,279+1.8% | Added |
| Alliancebernstein L.P. | 544,227 | $35.5M | 0.01% | +503,436+1,234.2% | Added |
| Vanguard Fiduciary Trust Co | 308,546 | $35.4M | 0.01% | +308,546 | New |
| Qube Research & Technologies Ltd | 303,847 | $34.9M | 0.05% | +205,941+210.3% | Added |
| Vivaldi Asset Management, LLC | 238,235 | $27.4M | 1.44% | +238,235 | New |
| CNH Partners LLC | 231,730 | $26.6M | 0.44% | +231,730 | New |
| AJU IB Investment Co., Ltd. | 223,486 | $25.7M | 84.07% | 00.0% | Unchanged |
| LMR Partners LLP | 212,495 | $24.4M | 0.22% | +212,495 | New |
| Barclays PLC | 207,642 | $23.8M | 0.01% | +10,870+5.5% | Added |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 200,000 | $23.0M | 0.31% | +200,000 | New |
| Gabelli Funds LLC | 195,900 | $22.5M | 0.15% | +195,900 | New |
| UBS Group AG | 194,709 | $22.4M | 0.00% | −121,903−38.5% | Reduced |
| Verition Fund Management LLC | 187,354 | $21.5M | 0.21% | +187,354 | New |
| Water Island Capital LLC | 183,409 | $21.1M | 2.81% | +183,409 | New |
| Man Group plc | 180,000 | $20.7M | 0.04% | +176,678+5,318.4% | Added |
| Rock Springs Capital Management LP | 169,859 | $19.5M | 1.15% | 00.0% | Unchanged |
| Gabelli & Co Investment Advisers, Inc. | 152,400 | $17.5M | 2.60% | +152,400 | New |
| BNP Paribas Arbitrage, SA | 151,558 | $17.4M | 0.01% | +147,953+4,104.1% | Added |
| Groupe la Francaise | 151,046 | $17.3M | 0.24% | +151,046 | New |
| Bank of New York Mellon Corp | 143,099 | $16.4M | 0.00% | +19,928+16.2% | Added |
| Credit Industriel Et Commercial | 134,648 | $15.5M | 2.46% | +134,648 | New |
| Woodline Partners LP | 123,750 | $14.2M | 0.05% | −614,074−83.2% | Reduced |
| Gardner Lewis Asset Management L P | 123,197 | $14.1M | 3.06% | +123,197 | New |
| Hudson Bay Capital Management LP | 122,900 | $14.1M | 0.08% | −278,042−69.3% | Reduced |
| Picton Mahoney Asset Management | 120,000 | $13.8M | 0.14% | +120,000 | New |
| FMR LLC | 119,378 | $13.7M | 0.00% | −3,444,350−96.7% | Reduced |
| Slotnik Capital, LLC | 118,000 | $13.5M | 4.03% | +118,000 | New |
| Oddo BHF Asset Management SAS | 115,000 | $13.2M | 0.52% | +115,000 | New |
| Prelude Capital Management, LLC | 98,849 | $11.3M | 0.87% | +98,849 | New |
| Renaissance Technologies LLC | 96,400 | $11.1M | 0.02% | +96,400 | New |
| Janus Henderson Group PLC | 90,280 | $10.4M | 0.00% | −829,298−90.2% | Reduced |
| CIBRA Capital Ltd | 88,623 | $10.2M | 4.91% | +88,623 | New |
| Nuveen, LLC | 85,294 | $9.79M | 0.00% | +3,350+4.1% | Added |
| Deutsche Bank AG | 80,664 | $9.26M | 0.00% | −152,928−65.5% | Reduced |
| Cinctive Capital Management LP | 80,000 | $9.19M | 0.60% | +80,000 | New |
| Chicago Capital Management, LLC | 92,951 | $8.04M | 6.66% | +92,951 | New |
| Sagefield Capital LP | 65,097 | $7.47M | 0.54% | +65,097 | New |
| Athos Capital Ltd | 64,900 | $7.45M | 2.30% | +64,900 | New |
| Russell Investments Group, Ltd. | 61,905 | $7.11M | 0.01% | −68,615−52.6% | Reduced |
| Samsara BioCapital, LLC | 60,873 | $6.99M | 0.68% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 57,289 | $6.58M | 0.00% | −103,746−64.4% | Reduced |
| Voleon Capital Management LP | 56,720 | $6.51M | 0.14% | +56,720 | New |
| PSquared Asset Management AG | 55,251 | $6.34M | 2.21% | +55,251 | New |
| Swiss National Bank | 54,700 | $6.28M | 0.00% | 00.0% | Unchanged |
| Twin Securities, Inc. | 53,982 | $6.20M | 3.06% | +53,982 | New |
| Susquehanna Portfolio Strategies, LLC | 50,938 | $5.85M | 0.09% | 00.0% | Unchanged |
| Harvest Management LLC | 50,000 | $5.74M | 3.05% | +50,000 | New |
| Congress Asset Management Co | 47,551 | $5.46M | 0.04% | +21,552+82.9% | Added |
| Invesco Ltd. | 47,280 | $5.43M | 0.00% | +6,908+17.1% | Added |
| Price T Rowe Associates Inc | 45,954 | $5.28M | 0.00% | −1,564,847−97.1% | Reduced |
| Rhumbline Advisers | 45,211 | $5.19M | 0.00% | +859+1.9% | Added |
| Maven Securities LTD | 42,500 | $4.88M | 0.28% | +42,500 | New |
| Rafferty Asset Management, LLC | 39,441 | $4.53M | 0.02% | −30,074−43.3% | Reduced |
| California State Teachers Retirement System | 34,886 | $4.01M | 0.00% | +7,771+28.7% | Added |
| Equitec Proprietary Markets, LLC | 33,574 | $3.85M | 8.91% | +33,574 | New |
| ADAR1 Capital Management, LLC | 32,084 | $3.68M | 0.22% | +600+1.9% | Added |
| Fifth Lane Capital, LP | 31,044 | $3.56M | 4.33% | +31,044 | New |
| DekaBank Deutsche Girozentrale | 30,000 | $3.50M | 0.01% | 00.0% | Unchanged |
| Abc Arbitrage SA | 30,347 | $3.48M | 0.46% | +30,347 | New |
| Healthcare of Ontario Pension Plan Trust Fund | 30,000 | $3.44M | 0.01% | +30,000 | New |
| Vanguard Asset Management, Ltd | 27,521 | $3.16M | 0.00% | +27,521 | New |
| Squarepoint Ops LLC | 27,145 | $3.12M | 0.01% | −22,730−45.6% | Reduced |
| New York Life Investment Management LLC | 26,243 | $3.01M | 0.03% | +26,243 | New |
| SG Americas Securities, LLC | 24,713 | $2.84M | 0.00% | +12,672+105.2% | Added |
| Yakira Capital Management, Inc. | 24,000 | $2.76M | 0.81% | +24,000 | New |
| Skandinaviska Enskilda Banken AB (publ) | 24,000 | $2.76M | 0.06% | +24,000 | New |
| Legal & General Group Plc | 21,888 | $2.51M | 0.00% | −7,677−26.0% | Reduced |
| Citadel Advisors LLC | 21,806 | $2.50M | 0.00% | −1,478,417−98.5% | Reduced |
| Erste Asset Management GmbH | 21,000 | $2.41M | 0.02% | 00.0% | Unchanged |
| MetLife Investment Management | 20,914 | $2.40M | 0.01% | +1,570+8.1% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 20,806 | $2.39M | 0.00% | +804+4.0% | Added |