| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 17% | +48% | $866,626,126 | +$300,351,037 | 9,604,634 | +53% | T. Rowe Price Investment Management, Inc. | 30 Nov 2025 |
| FMR LLC | 10% | -9.2% | $473,004,163 | -$44,527,920 | 5,761,317 | -8.6% | FMR LLC | 30 Sep 2025 |
| Elghandour Rami | 6.9% | $236,430,358 | 3,997,132 | Rami Elghandour | 27 Feb 2025 | |||
| VANGUARD GROUP INC | 7.2% | +18% | $235,721,977 | +$38,747,036 | 3,985,156 | +20% | The Vanguard Group | 31 Mar 2025 |
| BlackRock, Inc. | 6.4% | $208,635,063 | 3,527,220 | BlackRock, Inc. | 31 Mar 2025 | |||
| New Enterprise Associates 15, L.P. | 5.5% | -18% | $226,341,069 | -$51,107,940 | 3,055,360 | -18% | Scott D. Sandell | 12 Aug 2025 |
| PERCEPTIVE ADVISORS LLC | 4.5% | -16% | $183,570,240 | -$33,223,250 | 2,478,000 | -15% | Perceptive Advisors LLC | 30 Jun 2025 |
As of 30 Sep 2025, 207 institutional investors reported holding 63,039,877 shares of Arcellx, Inc. - COMMON STOCK (ACLX). This represents 109% of the company’s total 57,859,241 outstanding shares.
The largest institutional shareholders of Arcellx, Inc. - COMMON STOCK (ACLX) together control 94% 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 |
|---|---|---|---|---|---|
| GILEAD SCIENCES, INC. | 12% | 6,720,803 | 0% | 31% | $551,777,926 |
| T. Rowe Price Investment Management, Inc. | 11% | 6,352,356 | +227% | 0.32% | $521,529,000 |
| FMR LLC | 10% | 5,761,317 | -3.5% | 0.02% | $473,004,165 |
| Paradigm Biocapital Advisors LP | 8% | 4,649,016 | 0% | 11% | $381,684,214 |
| VANGUARD GROUP INC | 6.8% | 3,907,087 | -0.96% | 0% | $320,771,843 |
| BlackRock, Inc. | 5.9% | 3,387,896 | -2.3% | 0% | $278,146,282 |
| NEA Management Company, LLC | 5.3% | 3,045,262 | -19% | 14% | $250,016,010 |
| RA CAPITAL MANAGEMENT, L.P. | 5.2% | 3,036,527 | 0% | 3.1% | $249,298,867 |
| PERCEPTIVE ADVISORS LLC | 4.3% | 2,468,353 | -0.39% | 5.9% | $202,651,781 |
| SR One Capital Management, LP | 4.1% | 2,346,630 | 0% | 28% | $192,658,323 |
| STATE STREET CORP | 2.6% | 1,526,027 | -4.2% | 0% | $125,286,817 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 2.2% | 1,264,051 | -12% | 0.01% | $103,779,000 |
| Vestal Point Capital, LP | 2.2% | 1,250,000 | -55% | 4.7% | $102,625,000 |
| AJU IB Investment Co., Ltd. | 1.8% | 1,047,557 | 0% | 75% | $86,004,430 |
| CITADEL ADVISORS LLC | 1.8% | 1,021,453 | +415% | 0.07% | $83,861,291 |
| JANUS HENDERSON GROUP PLC | 1.8% | 1,013,921 | -0.94% | 0.04% | $83,246,424 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.6% | 926,304 | -3.7% | 0% | $76,063,242 |
| JPMORGAN CHASE & CO | 1.5% | 882,503 | -9.7% | 0% | $72,453,497 |
| Capital World Investors | 1.4% | 783,011 | 0% | 0.01% | $64,285,203 |
| Cormorant Asset Management, LP | 1.3% | 775,000 | -3.1% | 4.4% | $63,627,500 |
| BAMCO INC /NY/ | 0.95% | 550,236 | +6.2% | 0.12% | $45,174,376 |
| Schonfeld Strategic Advisors LLC | 0.86% | 500,315 | +44% | 0.29% | $41,075,859 |
| Affinity Asset Advisors, LLC | 0.86% | 500,000 | +1% | 3.8% | $41,050,000 |
| GOLDMAN SACHS GROUP INC | 0.78% | 448,441 | -12% | 0.01% | $36,817,006 |
| MORGAN STANLEY | 0.75% | 432,882 | -16% | 0% | $35,539,678 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 181,808 | $11,847,007 | +$5,693,023 | $65.20 | 17 |
| 2025 Q3 | 63,039,877 | $5,175,204,679 | +$190,810,955 | $82.10 | 207 |
| 2025 Q2 | 60,837,024 | $4,006,426,303 | -$46,745,394 | $65.85 | 200 |
| 2025 Q1 | 61,569,071 | $4,042,655,317 | +$146,757,614 | $65.60 | 195 |
| 2024 Q4 | 59,173,488 | $4,537,933,254 | +$127,885,614 | $76.69 | 208 |
| 2024 Q3 | 49,489,072 | $4,134,911,622 | -$113,590,332 | $83.51 | 187 |
| 2024 Q2 | 50,216,288 | $2,771,084,989 | +$169,312,707 | $55.19 | 165 |
| 2024 Q1 | 45,871,627 | $3,189,829,274 | +$27,240,951 | $69.55 | 139 |
| 2023 Q4 | 96,655 | $5,364,352 | +$2,192,417 | $55.50 | 2 |
| 2023 Q3 | 47,577,643 | $1,707,089,315 | -$17,227,772 | $35.88 | 132 |
| 2023 Q2 | 48,066,751 | $1,519,833,268 | +$79,511,127 | $31.62 | 134 |
| 2023 Q1 | 45,593,955 | $1,403,614,102 | +$113,912,236 | $30.81 | 115 |
| 2022 Q4 | 41,874,488 | $1,297,266,099 | +$51,957,057 | $30.98 | 122 |
| 2022 Q3 | 41,554,896 | $780,008,285 | +$126,264,159 | $18.77 | 71 |
| 2022 Q2 | 33,087,666 | $588,783,000 | +$136,265,287 | $18.08 | 65 |
| 2022 Q1 | 14,933,469 | $208,514,000 | +$208,482,958 | $14.02 | 44 |