Latest Period
Q2 2026
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 Q2 2026
Institutions Reporting
2
Shares (Excl. Options)
30,013
Price
$114.71
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- Security type / class
- Equity / Common Stock, $0.001 par value per share
- Symbol
- ACLX
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 30,013
- Total 13F value
- $3,431,496
- Portfolio coverage rank
- 0%
- Share change
- -56,497,999
- Value change
- -$6,457,454,262
- Number of holders
- 2
- Shares outstanding
- 100
- SEC-reported price per share
- $114.71
- Insider filing price
- $114.71
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ACLX - Arcellx, Inc. - Common Stock, $0.001 par value per share is tracked under CUSIP 03940C100.
- 2 institutions reported positions in Q2 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 239 to 2 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $6,516,715,869 to $3,431,496.
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 2 institutions filings for Q2 2026.
Security key
03940C100
Latest holder period
Q2 2026
13F holders
2
13D/G owners
6
CIK / CUSIP context first
Open Q2 2026 holders
ACLX full holder history
Arcellx, Inc. SEC filings
Arcellx, Inc. company facts
Arcellx, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 03940C100:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
ACLX
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| 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 30 Jun 2026, 2 institutional investors reported holding 30,013 shares of Arcellx, Inc. - Common Stock, $0.001 par value per share (ACLX). This represents 30013% of the company’s total 100 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
30013%
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
18
Latest
Q2 2026
Rows shown
1-18 of 18
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 30,013 | $3,431,496 | -$6,457,454,262 | $114.71 | 2 |
| 2026 Q1 | 57,013,620 | $6,516,715,869 | -$794,507,222 | $114.82 | 239 |
| 2025 Q4 | 66,618,337 | $4,343,544,589 | +$191,098,400 | $65.20 | 218 |
| 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 |