ARCELLX INC (ACLX) Institutional Ownership Changes & 13F Activity
ARCELLX INC (ACLX). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Fmr Llc, T. Rowe Price Investment Management, Inc., Pentwater Capital Management Lp, Fil Ltd, and Hbk Investments L P.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Catalio Capital Management, Lp | Sell | -156,109 | -100.0% | 0 | $0.00 | Q1 2026 | Sep 02, 2026 |
| Torno Capital, Llc | Buy | +7,285 | — | 7,285 | $836.46K | Q1 2026 | Aug 17, 2026 |
| O'Connor Alternative Investments Llc | Buy | +450,504 | — | 450,504 | $51.73M | Q1 2026 | Aug 14, 2026 |
| Mirae Asset Global Investments Co., Ltd. | Buy | +240 | +8.5% | 3,050 | $350.20K | Q1 2026 | Aug 12, 2026 |
| Wells Fargo & Company/Mn | Sell | -39,867 | -73.5% | 14,393 | $1.65M | Q1 2026 | Jul 08, 2026 |
| Oddo Bhf Asset Management Sas | Buy | +115,000 | — | 115,000 | $13.20M | Q1 2026 | May 18, 2026 |
| Bank Of America Corp | Buy | +24,564 | +5.7% | 452,333 | $51.94M | Q1 2026 | May 18, 2026 |
| California State Teachers Retirement System | Buy | +7,771 | +28.7% | 34,886 | $4.01M | Q1 2026 | May 18, 2026 |
| Adar1 Capital Management, Llc | Buy | +600 | +1.9% | 32,084 | $3.68M | Q1 2026 | May 18, 2026 |
| Fmr Llc | Sell | -3,444,350 | -96.7% | 119,378 | $13.71M | Q1 2026 | May 15, 2026 |
| T. Rowe Price Investment Management, Inc. | Sell | -3,397,645 | -60.1% | 2,255,878 | $259.02M | Q1 2026 | May 15, 2026 |
| Pentwater Capital Management Lp | Buy | +2,870,000 | — | 2,870,000 | $329.53M | Q1 2026 | May 15, 2026 |
| Fil Ltd | Buy | +2,339,192 | — | 2,339,192 | $268.59M | Q1 2026 | May 15, 2026 |
| Hbk Investments L P | Buy | +2,278,517 | — | 2,278,517 | $261.62M | Q1 2026 | May 15, 2026 |
| Price T Rowe Associates Inc | Sell | -1,564,847 | -97.1% | 45,954 | $5.28M | Q1 2026 | May 15, 2026 |
| Citadel Advisors Llc | Sell | -1,478,417 | -98.5% | 21,806 | $2.50M | Q1 2026 | May 15, 2026 |
| Janus Henderson Group Plc | Sell | -829,298 | -90.2% | 90,280 | $10.37M | Q1 2026 | May 15, 2026 |
| Goldman Sachs Group Inc | Buy | +643,675 | +96.3% | 1,312,155 | $150.66M | Q1 2026 | May 15, 2026 |
| Woodline Partners Lp | Sell | -614,074 | -83.2% | 123,750 | $14.21M | Q1 2026 | May 15, 2026 |
| Tig Advisors, Llc | Buy | +541,378 | — | 541,378 | $62.16M | Q1 2026 | May 15, 2026 |
| Alliancebernstein L.P. | Buy | +503,436 | +1234.2% | 544,227 | $35.48M | Q1 2026 | May 15, 2026 |
| Millennium Management Llc | Buy | +494,025 | +5600.6% | 502,846 | $57.74M | Q1 2026 | May 15, 2026 |
| Balyasny Asset Management L.P. | Buy | +479,763 | — | 479,763 | $55.09M | Q1 2026 | May 15, 2026 |
| Tudor Investment Corp Et Al | Buy | +416,559 | +905.0% | 462,588 | $53.11M | Q1 2026 | May 15, 2026 |
| Morgan Stanley | Buy | +407,409 | +78.6% | 925,813 | $106.30M | Q1 2026 | May 15, 2026 |
| Nexpoint Asset Management, L.P. | Buy | +373,150 | — | 373,150 | $42.85M | Q1 2026 | May 15, 2026 |
| State Street Corp | Sell | -322,608 | -16.1% | 1,675,895 | $192.43M | Q1 2026 | May 15, 2026 |
| Aqr Arbitrage Llc | Buy | +231,730 | — | 231,730 | $26.61M | Q1 2026 | May 15, 2026 |
| Lmr Partners Llp | Buy | +212,495 | — | 212,495 | $24.40M | Q1 2026 | May 15, 2026 |
| Qube Research & Technologies Ltd | Buy | +205,941 | +210.3% | 303,847 | $34.89M | Q1 2026 | May 15, 2026 |
Frequently asked questions about ACLX activity
Which institutional owners are buying ACLX?
Institutional owners buying ACLX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in ACLX activity?
"Buy" means an investor increased their reported position in ACLX compared to the prior reporting period. This reflects growing exposure to ARCELLX INC (ACLX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in ACLX increasing?
Institutional interest in ACLX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
Related ACLX Institutional Insights
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