Companies / Aktis Oncology, Inc.

Aktis Oncology, Inc.

Nasdaq: AKTSCIK 2035832BOSTON, MA

Ownership

55.3M shares outstanding · as of Apr 30, 2026
8.6%Insiders
Ownership
96.6%Common Stock
Share classes
Common Stock96.61%
Class A3.39%
Insiders8.61%4,759,726
10%+ / strategic37.41%20,677,515
Institutions15.53%8,582,184
Public float38.46%21,258,022

% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.

Insiders 27

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Insider% of sharesShares
Gadicke Ansbert10% owner
18.56%10,260,064
Mpm Bioventures 2018, L.P.10% owner
18.56%10,260,064
Foley ToddDirector · 10% owner
7.66%4,235,403
EcoR1 Capital, LLCDirector · 10% owner
0.63%347,305
Kim Helen SusanDirector · 10% owner
0.28%157,387
Vida Ventures II, LLC10% owner
0.28%157,387
Segal Lloyd MitchellDirector
0.04%19,631
Czibere AkosChief Medical Officer
——
ELI LILLY & Co10% owner
——
Evnin Luke10% owner
——

Institutional holders 21

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HolderValue% of shares
BlackRock, Inc.$73.43M4.12%
Merck & Co., Inc.$30.71M1.72%
RA Capital Management, L.P.$26.89M2.72%
Janus Henderson Group PLC$26.02M2.63%
Baker Bros. Advisors LP$17.82M1.80%
State Street Corporation$15.60M0.88%
Geode Capital Management, LLC$8.80M0.89%
TD Asset Management Inc$1.81M0.18%
Soros Fund Management LLC$1.79M0.18%
Laurion Capital Management LP$1.79M0.18%

Activity

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InsidersInstitutions
What insiders are doing in this stock (Form 4).
DateActorActionSecurityValueShares ΔPosition afterImpact
Jan 12, 2026EcoR1 Capital, LLC
Director
BuyCommon Stock$37.40M+2.1M
+91.50%
4,348,658
7.87% of shares
high
Jan 12, 2026Mpm Bioventures 2018, L.P.
10% owner
BuyCommon Stock$20.03M+1.1M
+12.17%
10,260,064
18.56% of shares
high
Jan 12, 2026Gadicke Ansbert
10% owner
BuyCommon Stock$20.03M+1.1M
+12.17%
10,260,064
18.56% of shares
high
Jan 12, 2026Vida Ventures II, LLC
10% owner
BuyCommon Stock$14.62M+812K
+16.72%
5,671,825
10.26% of shares
high
Jan 12, 2026Kim Helen Susan
Director
BuyCommon Stock$14.62M+812K
+16.72%
5,671,825
10.26% of shares
high
Jan 12, 2026Foley Todd
Director
BuyCommon Stock$4.19M+233K
+5.82%
4,235,403
7.66% of shares
high
Jan 12, 2026EcoR1 Capital, LLC
Director
BuyCommon Stock$2.60M+144K
+71.20%
347,305
0.63% of shares
high
Jan 12, 2026Vida Ventures II, LLC
10% owner
BuyCommon Stock$405.8K+23K
+16.72%
157,387
0.28% of shares
medium

Securities

via CUSIP / OpenFIGI
SymbolTypeMarketCUSIPFIGI
AKTSCommon StockEquity01021M104BBG00ZQS8KZ1