Aktis Oncology, Inc. Common

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.

Summary

Top institutional holders (Form 13F)

Showing 15 of 82 managers by value.

ManagerLocationValueShares
MPM BIOIMPACT LLCBOSTON, MA$86.5M4,835,872
EcoR1 Capital, LLCSan Francisco, CA$86.3M4,824,469
Blue Owl Capital Holdings LPNew York, NY$56.6M3,161,348
WELLINGTON MANAGEMENT GROUP LLPBOSTON, MA$41.5M2,317,044
BlackRock, Inc.New York, NY$37.8M2,112,127
RTW INVESTMENTS, LPNEW YORK, NY$28.5M1,592,043
RA CAPITAL MANAGEMENT, L.P.Boston, MA$26.9M1,503,084
JANUS HENDERSON GROUP PLCLONDON, X0$26.0M1,454,267
BAKER BROS. ADVISORS LPNEW YORK, NY$17.8M996,351
Octagon Capital Advisors LPNEW YORK, NY$17.2M960,847
Merck & Co., Inc.RAHWAY, NJ$17.0M952,844
EVENTIDE ASSET MANAGEMENT, LLCBoston, MA$9.1M507,000
GEODE CAPITAL MANAGEMENT, LLCBOSTON, MA$8.8M491,936
Avidity Partners Management LPDALLAS, TX$8.4M468,566
STATE STREET CORPBOSTON, MA$7.7M428,253

Top fund holders (N-PORT)

Showing 15 of 16 fund positions by value.

FundRegistrantValue% of fund
VANGUARD HEALTH CARE FUNDVANGUARD SPECIALIZED FUNDS$37.9M10.29%
T. Rowe Price Small-Cap Stock Fund, Inc.T. ROWE PRICE SMALL-CAP STOCK FUND, INC.$11.0M13.58%
T. Rowe Price Health Sciences Fund, Inc.T. ROWE PRICE HEALTH SCIENCES FUND, INC.$6.0M5.48%
T. Rowe Price Institutional Small-Cap Stock FundT. Rowe Price Equity Funds, Inc.$5.7M13.24%
VANGUARD EXTENDED MARKET INDEX FUNDVANGUARD INDEX FUNDS$3.8M0.46%
T. Rowe Price Small-Cap Value Fund, Inc.T. ROWE PRICE SMALL-CAP VALUE FUND, INC.$3.7M3.96%
T. Rowe Price New Horizons Fund, Inc.T. ROWE PRICE NEW HORIZONS FUND, INC.$3.5M2.76%
VANGUARD RUSSELL 2000 INDEX FUNDVANGUARD SCOTTSDALE FUNDS$2.2M1.25%
BlackRock Health Sciences Term TrustBlackRock Health Sciences Term Trust$1.0M10.35%
Master Small Cap Index SeriesQuantitative Master Series LLC$587K1.22%
T. Rowe Price Spectrum Moderate Growth Allocation FundT. ROWE PRICE SPECTRUM FUNDS II, INC.$457K1.06%
BlackRock Health Sciences TrustBlackRock Health Sciences Trust$416K7.80%
T. Rowe Price Health Sciences PortfolioT. ROWE PRICE EQUITY SERIES, INC.$358K5.40%
VANGUARD BALANCED INDEX FUNDVANGUARD VALLEY FORGE FUNDS$183K0.03%
VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUNDVANGUARD INSTITUTIONAL INDEX FUNDS$144K0.05%

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