Aktis Oncology, Inc. Common is a security (CUSIP 01021M104) tracked across SEC portfolio filings. 82 institutional managers reported $540.7M on Form 13F as of 2026-06-30; 16 registered fund positions totaling $77.0M via N-PORT as of 2026-05-31.
Showing 15 of 82 managers by value.
| Manager | Location | Value | Shares |
|---|---|---|---|
| MPM BIOIMPACT LLC | BOSTON, MA | $86.5M | 4,835,872 |
| EcoR1 Capital, LLC | San Francisco, CA | $86.3M | 4,824,469 |
| Blue Owl Capital Holdings LP | New York, NY | $56.6M | 3,161,348 |
| WELLINGTON MANAGEMENT GROUP LLP | BOSTON, MA | $41.5M | 2,317,044 |
| BlackRock, Inc. | New York, NY | $37.8M | 2,112,127 |
| RTW INVESTMENTS, LP | NEW YORK, NY | $28.5M | 1,592,043 |
| RA CAPITAL MANAGEMENT, L.P. | Boston, MA | $26.9M | 1,503,084 |
| JANUS HENDERSON GROUP PLC | LONDON, X0 | $26.0M | 1,454,267 |
| BAKER BROS. ADVISORS LP | NEW YORK, NY | $17.8M | 996,351 |
| Octagon Capital Advisors LP | NEW YORK, NY | $17.2M | 960,847 |
| Merck & Co., Inc. | RAHWAY, NJ | $17.0M | 952,844 |
| EVENTIDE ASSET MANAGEMENT, LLC | Boston, MA | $9.1M | 507,000 |
| GEODE CAPITAL MANAGEMENT, LLC | BOSTON, MA | $8.8M | 491,936 |
| Avidity Partners Management LP | DALLAS, TX | $8.4M | 468,566 |
| STATE STREET CORP | BOSTON, MA | $7.7M | 428,253 |
Showing 15 of 16 fund positions by value.
| Fund | Registrant | Value | % of fund |
|---|---|---|---|
| VANGUARD HEALTH CARE FUND | VANGUARD SPECIALIZED FUNDS | $37.9M | 10.29% |
| T. Rowe Price Small-Cap Stock Fund, Inc. | T. ROWE PRICE SMALL-CAP STOCK FUND, INC. | $11.0M | 13.58% |
| T. Rowe Price Health Sciences Fund, Inc. | T. ROWE PRICE HEALTH SCIENCES FUND, INC. | $6.0M | 5.48% |
| T. Rowe Price Institutional Small-Cap Stock Fund | T. Rowe Price Equity Funds, Inc. | $5.7M | 13.24% |
| VANGUARD EXTENDED MARKET INDEX FUND | VANGUARD INDEX FUNDS | $3.8M | 0.46% |
| T. Rowe Price Small-Cap Value Fund, Inc. | T. ROWE PRICE SMALL-CAP VALUE FUND, INC. | $3.7M | 3.96% |
| T. Rowe Price New Horizons Fund, Inc. | T. ROWE PRICE NEW HORIZONS FUND, INC. | $3.5M | 2.76% |
| VANGUARD RUSSELL 2000 INDEX FUND | VANGUARD SCOTTSDALE FUNDS | $2.2M | 1.25% |
| BlackRock Health Sciences Term Trust | BlackRock Health Sciences Term Trust | $1.0M | 10.35% |
| Master Small Cap Index Series | Quantitative Master Series LLC | $587K | 1.22% |
| T. Rowe Price Spectrum Moderate Growth Allocation Fund | T. ROWE PRICE SPECTRUM FUNDS II, INC. | $457K | 1.06% |
| BlackRock Health Sciences Trust | BlackRock Health Sciences Trust | $416K | 7.80% |
| T. Rowe Price Health Sciences Portfolio | T. ROWE PRICE EQUITY SERIES, INC. | $358K | 5.40% |
| VANGUARD BALANCED INDEX FUND | VANGUARD VALLEY FORGE FUNDS | $183K | 0.03% |
| VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND | VANGUARD INSTITUTIONAL INDEX FUNDS | $144K | 0.05% |