Latest Period
Q4 2025
Security Snapshot
Arcellx, Inc. - Common Stock $0.001 par value per share (ACLX) Institutional Ownership
CUSIP: 03940C100
13F Institutional Holders and Ownership History from Q1 2022 to Q1 2026
Institutions Reporting
217
Shares (Excl. Options)
66,618,317
Price
$65.20
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- Type / Class
- Equity / Common Stock $0.001 par value per share
- Symbol
- ACLX on Nasdaq
- Shares outstanding
- 100
- Price per share
- $114.82
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 66,618,317
- Total reported value
- $4,343,543,285
- % of total 13F portfolios
- 0.01%
- Share change
- +3,593,391
- Value change
- +$191,099,878
- Number of holders
- 217
- Price from insider filings
- $114.82
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- ACLX - Arcellx, Inc. - Common Stock $0.001 par value per share is tracked under CUSIP 03940C100.
- 217 institutions reported positions in Q4 2025.
- 8 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 217 to 45 between Q4 2025 and Q1 2026.
- Reported value moved from $4,343,543,285 to $109,235,446.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 217 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 03940C100?
CUSIP 03940C100 identifies ACLX - Arcellx, Inc. - Common Stock $0.001 par value per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 03940C100:
Significant Owners of Arcellx, Inc. - Common Stock $0.001 par value 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 | |||
| Vestal Point Capital, LP | 5.1% | $193,839,750 | 2,925,000 | Vestal Point Capital, LP | 31 Dec 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 Dec 2025, 217 institutional investors reported holding 66,618,317 shares of Arcellx, Inc. - Common Stock $0.001 par value per share (ACLX). This represents 66618317% of the company’s total 100 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Arcellx, Inc. - Common Stock $0.001 par value per share (ACLX) together control 58045649% 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. | 10560425% | 10,560,425 | +66% | 0.43% | $688,540,000 |
| GILEAD SCIENCES, INC. | 6720803% | 6,720,803 | 0% | 23% | $438,196,356 |
| Paradigm Biocapital Advisors LP | 5724016% | 5,724,016 | +23% | 10% | $373,205,843 |
| VANGUARD GROUP INC | 4081519% | 4,081,519 | +4.5% | 0% | $266,115,040 |
| FMR LLC | 3563728% | 3,563,728 | -38% | 0.01% | $232,355,097 |
| BlackRock, Inc. | 3548787% | 3,548,787 | +4.7% | 0% | $231,380,928 |
| NEA Management Company, LLC | 3045262% | 3,045,262 | 0% | 10% | $198,551,082 |
| Vestal Point Capital, LP | 2925000% | 2,925,000 | +134% | 7% | $190,710,000 |
| SR One Capital Management, LP | 2346630% | 2,346,630 | 0% | 22% | $153,000,276 |
| STATE STREET CORP | 1998503% | 1,998,503 | +31% | 0% | $130,302,396 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1610801% | 1,610,801 | +27% | 0.01% | $105,025,000 |
| CITADEL ADVISORS LLC | 1500223% | 1,500,223 | +47% | 0.07% | $97,814,539 |
| PERCEPTIVE ADVISORS LLC | 1466071% | 1,466,071 | -41% | 1.8% | $95,587,829 |
| JPMORGAN CHASE & CO | 1454477% | 1,454,477 | +65% | 0.01% | $94,831,912 |
| RA CAPITAL MANAGEMENT, L.P. | 1267156% | 1,267,156 | -58% | 0.85% | $82,618,571 |
| GEODE CAPITAL MANAGEMENT, LLC | 958057% | 958,057 | +3.4% | 0% | $62,478,756 |
| JANUS HENDERSON GROUP PLC | 919578% | 919,578 | -9.3% | 0.03% | $59,957,552 |
| Woodline Partners LP | 737824% | 737,824 | +206% | 0.19% | $48,106,125 |
| GOLDMAN SACHS GROUP INC | 668480% | 668,480 | +49% | 0.01% | $43,584,896 |
| BAMCO INC /NY/ | 609697% | 609,697 | +11% | 0.11% | $39,752,244 |
| Affinity Asset Advisors, LLC | 523725% | 523,725 | +4.7% | 2.5% | $34,146,870 |
| MORGAN STANLEY | 518404% | 518,404 | +20% | 0% | $33,799,946 |
| LORD, ABBETT & CO. LLC | 449634% | 449,634 | +6% | 0.09% | $29,316,000 |
| BANK OF AMERICA CORP /DE/ | 427769% | 427,769 | +150% | 0% | $27,890,538 |
| AMERICAN CENTURY COMPANIES INC | 419080% | 419,080 | +1.7% | 0.01% | $27,324,142 |
Institutional Holders of Arcellx, Inc. - Common Stock $0.001 par value per share (ACLX) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 974,299 | $109,235,446 | +$24,730,504 | $114.82 | 45 |
| 2025 Q4 | 66,618,317 | $4,343,543,285 | +$191,099,878 | $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 |