| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 18% | +10% | $699,839,365 | +$63,340,270 | 10,560,425 | +10% | T. Rowe Price Investment Management, Inc. | 31 Dec 2025 |
| GILEAD SCIENCES, INC. | 12% | $457,955,516 | 6,720,803 | Gilead Sciences, Inc. | 23 Feb 2026 | |||
| Paradigm Biocapital Advisors LP | 9.9% | $379,330,540 | 5,724,016 | Paradigm BioCapital Advisors LP | 31 Dec 2025 | |||
| Elghandour Rami | 6.9% | $258,654,412 | 3,997,132 | Rami Elghandour | 27 Feb 2025 | |||
| VANGUARD GROUP INC | 7.2% | +18% | $257,879,445 | +$42,389,191 | 3,985,156 | +20% | The Vanguard Group | 31 Mar 2025 |
| FMR LLC | 6.2% | -42% | $232,355,096 | -$143,282,803 | 3,563,728 | -38% | FMR LLC | 31 Dec 2025 |
| BlackRock, Inc. | 6.4% | $228,246,406 | 3,527,220 | BlackRock, Inc. | 31 Mar 2025 | |||
| New Enterprise Associates 15, L.P. | 5.5% | -18% | $200,278,848 | -$45,223,076 | 3,055,360 | -18% | Scott D. Sandell | 12 Aug 2025 |
| Vestal Point Capital, LP | 5.1% | $193,839,750 | 2,925,000 | Vestal Point Capital, LP | 31 Dec 2025 | |||
| PERCEPTIVE ADVISORS LLC | 4.5% | -16% | $162,432,900 | -$29,397,733 | 2,478,000 | -15% | Perceptive Advisors LLC | 30 Jun 2025 |
| RA CAPITAL MANAGEMENT, L.P. | 2.2% | $83,974,428 | 1,267,156 | RA Capital Management, L.P. | 31 Dec 2025 |
As of 31 Dec 2025, 216 institutional investors reported holding 66,618,453 shares of Arcellx, Inc. - Common Stock, par value $0.001 (ACLX). This represents 114% of the company’s total 58,441,765 outstanding shares.
The largest institutional shareholders of Arcellx, Inc. - Common Stock, par value $0.001 (ACLX) together control 99% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 18% | 10,560,425 | +66% | 0.43% | $688,540,000 |
| GILEAD SCIENCES, INC. | 12% | 6,720,803 | 0% | 23% | $438,196,356 |
| Paradigm Biocapital Advisors LP | 9.8% | 5,724,016 | +23% | 10% | $373,205,843 |
| VANGUARD GROUP INC | 7% | 4,081,519 | +4.5% | 0% | $266,115,040 |
| FMR LLC | 6.1% | 3,563,728 | -38% | 0.01% | $232,355,097 |
| BlackRock, Inc. | 6.1% | 3,548,787 | +4.7% | 0% | $231,380,928 |
| NEA Management Company, LLC | 5.2% | 3,045,262 | 0% | 10% | $198,551,082 |
| Vestal Point Capital, LP | 5% | 2,925,000 | +134% | 7% | $190,710,000 |
| SR One Capital Management, LP | 4% | 2,346,630 | 0% | 22% | $153,000,276 |
| STATE STREET CORP | 3.4% | 1,998,503 | +31% | 0% | $130,302,396 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 2.8% | 1,610,801 | +27% | 0.01% | $105,025,000 |
| CITADEL ADVISORS LLC | 2.6% | 1,500,223 | +47% | 0.07% | $97,814,539 |
| PERCEPTIVE ADVISORS LLC | 2.5% | 1,466,071 | -41% | 1.8% | $95,587,829 |
| JPMORGAN CHASE & CO | 2.5% | 1,454,477 | +65% | 0.01% | $94,831,912 |
| RA CAPITAL MANAGEMENT, L.P. | 2.2% | 1,267,156 | -58% | 0.85% | $82,618,571 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.6% | 958,057 | +3.4% | 0% | $62,478,756 |
| JANUS HENDERSON GROUP PLC | 1.6% | 919,578 | -9.3% | 0.03% | $59,957,552 |
| Woodline Partners LP | 1.3% | 737,824 | +206% | 0.19% | $48,106,125 |
| GOLDMAN SACHS GROUP INC | 1.1% | 668,480 | +49% | 0.01% | $43,584,896 |
| BAMCO INC /NY/ | 1% | 609,697 | +11% | 0.11% | $39,752,244 |
| Affinity Asset Advisors, LLC | 0.9% | 523,725 | +4.7% | 2.5% | $34,146,870 |
| MORGAN STANLEY | 0.89% | 518,404 | +20% | 0% | $33,799,946 |
| LORD, ABBETT & CO. LLC | 0.77% | 449,634 | +6% | 0.09% | $29,316,000 |
| BANK OF AMERICA CORP /DE/ | 0.73% | 427,769 | +150% | 0% | $27,890,538 |
| AMERICAN CENTURY COMPANIES INC | 0.72% | 419,080 | +1.7% | 0.01% | $27,324,142 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 66,618,453 | $4,343,552,152 | +$191,109,528 | $65.20 | 216 |
| 2025 Q3 | 63,039,877 | $5,175,204,679 | +$190,810,895 | $82.10 | 207 |
| 2025 Q2 | 60,837,024 | $4,006,426,303 | -$46,745,437 | $65.85 | 200 |
| 2025 Q1 | 61,569,105 | $4,042,657,536 | +$146,759,811 | $65.60 | 195 |
| 2024 Q4 | 59,173,488 | $4,537,933,690 | +$127,885,655 | $76.69 | 208 |
| 2024 Q3 | 49,489,073 | $4,134,912,072 | -$113,389,722 | $83.51 | 185 |
| 2024 Q2 | 50,216,931 | $2,771,120,513 | +$171,282,810 | $55.19 | 164 |
| 2024 Q1 | 47,012,321 | $3,269,162,577 | +$35,796,177 | $69.55 | 180 |
| 2023 Q4 | 46,737,558 | $2,593,995,956 | -$29,980,183 | $55.50 | 154 |
| 2023 Q3 | 47,577,643 | $1,707,089,455 | -$7,341,800 | $35.88 | 132 |
| 2023 Q2 | 48,066,751 | $1,519,832,876 | +$79,444,997 | $31.62 | 134 |
| 2023 Q1 | 45,593,955 | $1,403,613,948 | +$114,227,065 | $30.81 | 115 |
| 2022 Q4 | 41,987,329 | $1,300,761,660 | +$53,764,127 | $30.98 | 123 |
| 2022 Q3 | 41,706,487 | $782,853,521 | +$127,574,774 | $18.77 | 74 |
| 2022 Q2 | 34,934,000 | $621,506,000 | +$145,615,758 | $18.08 | 67 |
| 2022 Q1 | 26,872,990 | $357,855,000 | +$357,824,000 | $14.02 | 48 |