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

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.