ACLX Institutional Ownership & Shareholders
ARCELLX INC (ACLX) is currently held by 9 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $90.34M based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026.
O'Connor Alternative Investments Llc is currently the largest disclosed institutional shareholder of ACLX tracked by InsiderSet, reporting ownership valued at approximately $51.73M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $51.84M, representing an estimated gain of +0.22% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed ACLX value among the investors covered in this analysis. Major shareholders include O'Connor Alternative Investments Llc, Janus Henderson Group Plc, Catalio Capital Management, Lp, and several other long-term asset managers with concentrated positions in ARCELLX INC (ACLX).
This page ranks the largest institutional ACLX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
9
Total Reported Value
$90.34M
Largest Holder
O'Connor Alternative Investments Llc
Largest Position
$51.73M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
182
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| O'Connor Alternative Investments Llc | 6.98% | 450,504 | $51,726,869 | $51,839,495 | +$112,626 | +0.22% | |
| Janus Henderson Group Plc | 0.01% | 90,280 | $10,367,304 | $10,388,520 | +$21,216 | +0.20% | |
| Catalio Capital Management, Lp | 1.80% | 156,109 | $10,178,307 | $17,963,463 | +$7,785,156 | +76.49% | |
| Cibra Capital Ltd | 4.91% | 88,623 | $10,175,693 | $10,197,849 | +$22,156 | +0.22% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 57,289 | $6,577,923 | $6,592,245 | +$14,322 | +0.22% | |
| Torno Capital, Llc | 0.37% | 7,285 | $836,464 | $838,285 | +$1,821 | +0.22% | |
| Bck Capital Management Lp | 2.00% | 4,000 | $459,280 | $460,280 | +$1,000 | +0.22% | |
| Cwm, Llc | 0.00% | 77 | $8,841 | $8,860 | +$19 | +0.22% | |
| Bare Financial Services, Inc | 0.00% | 39 | $4,478 | $4,488 | +$10 | +0.22% |
Frequently asked questions about ACLX
Who are the largest institutional holders of ACLX?
The largest institutional holders of ACLX reported in the latest SEC Form 13F filings include O'Connor Alternative Investments Llc, Janus Henderson Group Plc, Catalio Capital Management, Lp, Cibra Capital Ltd, and Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc. InsiderSet ranks institutional holders by their latest reported ACLX position.
What is ACLX institutional ownership?
This page tracks ACLX positions reported by institutional investment managers through SEC Form 13F. ARCELLX INC (ACLX) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ACLX?
InsiderSet currently tracks 9 institutional managers reporting ACLX holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ACLX shareholders.
How much ACLX stock do institutions own?
Institutional investment managers disclosed approximately $90.34M in ACLX holdings for Q1 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ACLX institutional ownership last updated?
The latest ACLX institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended March 31, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ACLX holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ACLX position after the reporting date.
Are institutions buying or selling ACLX?
Institutional buying and selling can be analyzed by comparing ACLX positions across consecutive 13F reporting periods. InsiderSet's ACLX Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ACLX ownership changes.
How has ACLX institutional ownership changed over time?
InsiderSet tracks ACLX institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.