Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ACLX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | GILEAD SCIENCES, INC. | 6.7M | $771.7M | 0.0% | 11.487% | 36.44% |
| 2 | Paradigm Biocapital Advisors LP | 5.8M | $663.0M | +0.9% | 9.869% | 13.55% |
| 3 | BlackRock, Inc. | 3.9M | $453.0M | +11.2% | 6.743% | 0.01% |
| 4 | NEA Management Company, LLC | 3.0M | $349.7M | 0.0% | 5.205% | 19.88% |
| 5 | Pentwater Capital Management LP | 2.9M | $329.5M | β | 4.905% | 1.71% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2.4M | $278.5M | β | 4.145% | 0.01% |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.4M | $278.4M | β | 4.144% | 0.01% |
| 8 | SR ONE CAPITAL MANAGEMENT, LP | 2.3M | $269.4M | 0.0% | 4.011% | 29.43% |
| 9 | FIL Ltd | 2.3M | $268.6M | β | 3.998% | 0.21% |
| 10 | HBK INVESTMENTS L P | 2.3M | $261.6M | β | 3.894% | 3.40% |
| 11 | STATE STREET CORP | 1.7M | $192.4M | -16.1% | 2.865% | 0.01% |
| 12 | GOLDMAN SACHS GROUP INC | 1.4M | $156.7M | +92.0% | 2.333% | 0.02% |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | 1.0M | $118.1M | +7.4% | 1.758% | 0.01% |
| 14 | MORGAN STANLEY | 926K | $106.3M | +78.6% | 1.582% | 0.01% |
| 15 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 572K | $65.7M | +1164.1% | 0.978% | 0.01% |
| 16 | DAVIDSON KEMPNER CAPITAL MANAGEMENT LP | 560K | $64.3M | β | 0.957% | 1.38% |
| 17 | TIG Advisors, LLC | 541K | $62.2M | β | 0.925% | 3.19% |
| 18 | MILLENNIUM MANAGEMENT LLC | 503K | $57.7M | +5600.6% | 0.860% | 0.04% |
| 19 | BALYASNY ASSET MANAGEMENT LLC | 480K | $55.1M | β | 0.820% | 0.19% |
| 20 | TUDOR INVESTMENT CORP ET AL | 467K | $53.6M | +915.0% | 0.799% | 0.19% |
| 21 | BANK OF AMERICA CORP /DE/ | 452K | $51.9M | +5.7% | 0.773% | 0.00% |
| 22 | Magnetar Financial LLC | 395K | $45.3M | β | 0.675% | 0.46% |
| 23 | ALPINE ASSOCIATES MANAGEMENT INC. | 378K | $43.4M | β | 0.646% | 2.56% |
| 24 | HIGHLAND CAPITAL MANAGEMENT FUND ADVISORS, L.P. | 373K | $42.8M | β | 0.638% | 2.94% |
| 25 | Affinity Asset Advisors, LLC | 363K | $41.7M | -30.7% | 0.620% | 2.42% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ACLX β a direct measure of their conviction.
Filings activity in ACLX during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 233 | +8.4% | 89.74% | +37.38 pp | $6.04B | +71% |
| Q4 2025 | 215 | +7.0% | 52.36% | 14.67 pp | $3.53B | 22% |
| Q3 2025 | 201 | +0.0% | 67.03% | +10.90 pp | $4.51B | +19% |
| Q2 2025 | 201 | +3.6% | 56.13% | +1.04 pp | $3.78B | +1.9% |
| Q1 2025 | 194 | 6.7% | 55.09% | 6.55 pp | $3.71B | 11% |
| Q4 2024 | 208 | +16% | 61.64% | +8.50 pp | $4.15B | +16% |
| Q3 2024 | 180 | +8.4% | 53.14% | +15.17 pp | $3.58B | +40% |
| Q2 2024 | 166 | β | 37.97% | β | $2.56B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ACLX stock.
Based on Q1 2026 13F filings, institutional ownership of Arcellx, Inc. stands at 89.7%, held across 233 reporting institutions.
GILEAD SCIENCES, INC. is the largest reported institutional holder of ACLX, with approximately 6,720,803 shares worth $0.77B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of ACLX, including SUSQUEHANNA INTERNATIONAL GROUP, LLP, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for ACLX is 67 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
95 institutions opened new positions in ACLX during Q1 2026, while 77 fully exited. 106 added to existing positions and 32 trimmed.
ACLX institutional ownership rose by 37.38 percentage points quarter-over-quarter, with a net change of +18 holders.
The top 10 institutions account for 64.9% of all reported 13F value in ACLX, and the top 25 account for 84.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Arcellx, Inc. (ACLX) Institutional Ownership