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 Q2 2026
Institutions Reporting
238
Shares (Excl. Options)
56,563,116
Price
$114.82
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Common Stock, par value $0.001 per share
- Symbol
- ACLX
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 56,563,116
- Total 13F value
- $6,464,989,000
- Portfolio coverage rank
- 0.01%
- Share change
- -11,314,057
- Value change
- -$794,507,222
- Number of holders
- 238
- Shares outstanding
- 100
- SEC-reported price per share
- $115.07
- Insider filing price
- $115.07
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, par value $0.001 per share is tracked under CUSIP 03940C100.
- 238 institutions reported positions in Q1 2026.
- 7 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 238 to 0 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $6,464,989,000 to $0.
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 238 institutions filings for Q1 2026.
Security key
03940C100
Latest holder period
Q1 2026
13F holders
238
13D/G owners
7
CIK / CUSIP context first
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
7
Security
ACLX
| 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, 238 institutional investors reported holding 56,563,116 shares of Arcellx, Inc. - Common Stock, par value $0.001 per share (ACLX). This represents 56563116% 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
47406512%
| 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 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
18
Latest
Q1 2026
Rows shown
1-18 of 18
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 0 | $0 | -$7,034,328 | $115.07 | 0 |
| 2026 Q1 | 56,563,116 | $6,464,989,000 | -$794,507,222 | $114.82 | 238 |
| 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 |