Latest Period
Q1 2026
Security Snapshot
Arcellx, Inc. - Common Stock, par value $0.001 per share (ACLX) Institutional Ownership
CUSIP: 03940C100
13F Institutional Holders and Ownership History from Q1 2022 to Q1 2026
Institutions Reporting
236
Shares (Excl. Options)
56,544,181
Price
$114.82
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- Type / Class
- Equity / Common Stock, par value $0.001 per share
- Symbol
- ACLX
- Shares outstanding
- 100
- Price per share
- $115.07
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 56,544,181
- Total reported value
- $6,462,814,883
- % of total 13F portfolios
- 0.01%
- Share change
- -11,332,972
- Value change
- -$796,679,043
- Number of holders
- 236
- Price from insider filings
- $115.07
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- ACLX - Arcellx, Inc. - Common Stock, par value $0.001 per share is tracked under CUSIP 03940C100.
- 236 institutions reported positions in Q1 2026.
- 7 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 217 to 236 between Q4 2025 and Q1 2026.
- Reported value moved from $4,343,543,285 to $6,462,814,883.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 236 institutions filings for Q1 2026.
Security key
03940C100
Latest holder period
Q1 2026
13F holders
236
13D/G owners
7
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 03940C100:
Significant Owners of Arcellx, Inc. - Common Stock, par value $0.001 per share (ACLX) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Paradigm Biocapital Advisors LP | 9.9% | $379,330,540 | 5,724,016 | Paradigm BioCapital Advisors LP | 31 Dec 2025 | |||
| BlackRock, Inc. | 6.4% | $228,246,406 | 3,527,220 | BlackRock, Inc. | 31 Mar 2025 | |||
| T. Rowe Price Investment Management, Inc. | 4.5% | -77% | $185,450,898 | -$552,511,601 | 2,653,848 | -75% | T. Rowe Price Investment Management, Inc. | 28 Feb 2026 |
| 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 | |||
| FMR LLC | 0.5% | -95% | $21,601,128 | -$227,432,217 | 309,117 | -91% | FMR LLC | 27 Feb 2026 |
| GILEAD SCIENCES, INC. | 100% | +738% | $11,482 | -$771,671,118 | 100 | -100% | GILEAD SCIENCES, INC. | 28 Apr 2026 |
As of 31 Mar 2026, 236 institutional investors reported holding 56,544,181 shares of Arcellx, Inc. - Common Stock, par value $0.001 per share (ACLX). This represents 56544181% of the company’s total 100 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Arcellx, Inc. - Common Stock, par value $0.001 per share (ACLX) together control 47406512% 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. | 6720803% | 6,720,803 | 0% | 36% | $771,682,600 |
| Paradigm Biocapital Advisors LP | 5774016% | 5,774,016 | +0.87% | 14% | $662,972,517 |
| BlackRock, Inc. | 3945238% | 3,945,238 | +11% | 0.01% | $452,992,229 |
| NEA Management Company, LLC | 3045262% | 3,045,262 | 0% | 20% | $349,656,983 |
| Pentwater Capital Management LP | 2870000% | 2,870,000 | 2.3% | $329,533,400 | |
| VANGUARD CAPITAL MANAGEMENT LLC | 2425218% | 2,425,218 | 0% | 0.01% | $278,463,531 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2424818% | 2,424,818 | 0% | 0.01% | $278,417,603 |
| SR One Capital Management, LP | 2346630% | 2,346,630 | 0% | 29% | $269,440,057 |
| FIL Ltd | 2339192% | 2,339,192 | 0.21% | $268,586,025 | |
| HBK INVESTMENTS L P | 2278517% | 2,278,517 | 3.3% | $261,619,322 | |
| T. Rowe Price Investment Management, Inc. | 2255878% | 2,255,878 | -79% | 0.18% | $259,020,000 |
| STATE STREET CORP | 1675895% | 1,675,895 | -16% | 0.01% | $192,426,264 |
| GLAZER CAPITAL, LLC | 1507128% | 1,507,128 | 3.7% | $173,048,000 | |
| GOLDMAN SACHS GROUP INC | 1312155% | 1,312,155 | +96% | 0.02% | $150,661,637 |
| GEODE CAPITAL MANAGEMENT, LLC | 1028666% | 1,028,666 | +7.4% | 0.01% | $118,135,702 |
| MORGAN STANLEY | 925813% | 925,813 | +79% | 0.01% | $106,301,939 |
| JPMORGAN CHASE & CO | 593573% | 593,573 | -59% | 0% | $68,124,374 |
| Davidson Kempner Capital Management LP | 559644% | 559,644 | 1.4% | $64,258,324 | |
| ALLIANCEBERNSTEIN L.P. | 544227% | 544,227 | +1234% | 0.01% | $35,483,600 |
| TIG Advisors, LLC | 541378% | 541,378 | 3% | $62,161,022 | |
| MILLENNIUM MANAGEMENT LLC | 502846% | 502,846 | +5601% | 0.04% | $57,736,778 |
| Balyasny Asset Management L.P. | 479763% | 479,763 | 0.11% | $55,086,388 | |
| TUDOR INVESTMENT CORP ET AL | 462588% | 462,588 | +905% | 0.29% | $53,114,354 |
| BANK OF AMERICA CORP /DE/ | 452333% | 452,333 | +5.7% | 0% | $51,936,876 |
| Magnetar Financial LLC | 394931% | 394,931 | 0.46% | $45,345,977 |
Institutional Holders of Arcellx, Inc. - Common Stock, par value $0.001 per share (ACLX) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 56,544,181 | $6,462,814,883 | -$796,679,043 | $114.82 | 236 |
| 2025 Q4 | 66,618,317 | $4,343,543,285 | +$191,098,400 | $65.20 | 217 |
| 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 |