13F

Stock

Aktis Oncology, Inc.

AKTS · held by 69 managers

Reported value

$555.1M

Holders

69

+65 new · −0 exited

Holders’ est. mark

—

Need a prior quarter

Largest holder

$86.5M

MPM BIOIMPACT LLC

Notable conviction

Share of each notable manager’s 13F book.

Who holds it

Notable only
InvestorSharesValueEst. markChange
MPM BIOIMPACT LLC4.84M$86.5M—New
EcoR1 Capital, LLC4.82M$86.3M—New
Blue Owl Capital Holdings LP3.16M$56.6M—New
WELLINGTON MANAGEMENT GROUP LLP2.32M$41.5M—New
BlackRock, Inc.2.11M$37.8M—New
RTW INVESTMENTS, LP1.59M$28.5M—New
RA CAPITAL MANAGEMENT, L.P.1.5M$26.9M—New
JANUS HENDERSON GROUP PLC1.45M$26M—New
BAKER BROS. ADVISORS LP996.4K$17.8M—New
Octagon Capital Advisors LP960.8K$17.2M—New
Merck & Co., Inc.952.8K$17M—New
VANGUARD CAPITAL MANAGEMENT LLC833.9K$14.9M—Held
EVENTIDE ASSET MANAGEMENT, LLC507K$9.07M—New
GEODE CAPITAL MANAGEMENT, LLC491.9K$8.8M—New
Avidity Partners Management LP468.6K$8.38M—New
State Street428.3K$7.66M—New
a16z Capital Management, L.L.C.415K$7.42M—New
Fidelity386.4K$6.91M—New
UBS Group AG353.3K$6.32M—New
ArrowMark Colorado Holdings LLC329.5K$5.89M—New
Alyeska Investment Group, L.P.290K$5.19M—New
CHARLES SCHWAB INVESTMENT MANAGEMENT INC162K$2.9M—New
Driehaus Capital Management LLC150K$2.68M—New
NORTHERN TRUST CORP149.5K$2.67M—New
VANGUARD FIDUCIARY TRUST CO127.4K$2.28M—Held
VANGUARD PORTFOLIO MANAGEMENT LLC120.3K$2.15M—Held
AMERIPRISE FINANCIAL INC102.9K$1.84M—New
TD Asset Management Inc101K$1.81M—New
Soros Fund Management100K$1.79M—New
Laurion Capital Management LP100K$1.79M—New
Woodline Partners LP100K$1.79M—New
Citadel75K$1.34M—New
BANK OF AMERICA CORP /DE/69.9K$1.25M—New
MANUFACTURERS LIFE INSURANCE COMPANY, THE47K$840.7K—New
Bank of New York Mellon Corp42.9K$767.5K—New
MORGAN STANLEY30.7K$549.6K—New
GOLDMAN SACHS GROUP INC30.2K$539.6K—New
READYSTATE ASSET MANAGEMENT LP30K$536.7K—New
Ghisallo Capital Management LLC25K$447.3K—New
SEVEN GRAND MANAGERS, LLC25K$447.3K—New
Nuveen, LLC24.5K$437.7K—New
RHUMBLINE ADVISERS21K$376.3K—New
D. E. Shaw & Co., Inc.17.1K$305.2K—New
Zimmer Partners, LP15K$268.4K—New
Universal- Beteiligungs- und Servicegesellschaft mbH14.2K$253.8K—New
DEUTSCHE BANK AG\14.1K$251.9K—New
XTX Topco Ltd14K$250.3K—New
Invesco Ltd.12.1K$216.7K—New
MetLife Investment Management, LLC11.6K$208.2K—New
BARCLAYS PLC9.72K$174K—New
Vanguard Global Advisers, LLC9.69K$173.3K—Held
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.9.65K$172.7K—New
JPMORGAN CHASE & CO8.36K$138.2K—New
WELLS FARGO & COMPANY/MN7.61K$136.2K—New
PNC Financial Services Group, Inc.6.95K$124.3K—New
Police & Firemen's Retirement System of New Jersey5.53K$98.9K—New
BNP PARIBAS FINANCIAL MARKETS4.48K$80.1K—New
STRS OHIO3.6K$64.4K—New
NEW YORK STATE COMMON RETIREMENT FUND3.2K$57.2K—New
T. Rowe Price Investment Management, Inc.2.12M$38K—New
Legal & General Group Plc1.83K$32.7K—New
Ameritas Investment Partners, Inc.1.68K$30.1K—New
PRICE T ROWE ASSOCIATES INC /MD/1.56M$28K—New
Russell Investments Group, Ltd.1.55K$27.7K—New
CITIGROUP INC1.02K$18.2K—New
Tower Research Capital LLC (TRC)1.01K$18.1K—New
SALEM INVESTMENT COUNSELORS INC1K$17.9K—New
Sterling Capital Management LLC393$7.03K—New
CWM, LLC21$376—New

Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.