BIOVENTURES 2018 L.P. MPM - 12 Jan 2026 SCHEDULE 13D Report for AKTIS ONCOLOGY, INC. Common Stock (AKTSQ)

Filing Manager
BIOVENTURES 2018 L.P. MPM
Reporting Manager
ANSBERT GADICKE
Security
AKTIS ONCOLOGY, INC. Common Stock
Symbol
AKTSQ
Shares outstanding
53,160,953 shares
Disclosed Ownership
10,260,064 shares
Ownership
19%
Form type
SCHEDULE 13D
Filing time
20 Jan 2026, 17:44:53 UTC
Date of event
12 Jan 2026
SEC
View on sec.gov

Reporting Managers (13)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
MPM BIOVENTURES 2018, L.P. 7.4% 3,950,528 3,950,528 0 /s/ Ansbert Gadicke Managing director of MPM BioVentures 2018 LLC, the managing member of MPM BioVentures 2018 GP LLC, the GP of MPM BioVentures 2018, L.P. 0001729505
MPM BIOVENTURES 2018 (B), L.P. 0.4% 206,964 206,964 0 /s/ Ansbert Gadicke Managing director of MPM BioVentures 2018 LLC, the managing member of MPM BioVentures 2018 GP LLC, the GP of MPM BioVentures 2018(B), L.P. 0001729504
MPM BioVentures 2018 GP LLC 7.8% 4,157,492 0 4,157,492 /s/ Ansbert Gadicke Managing director of MPM BioVentures 2018 LLC, the managing member of MPM BioVentures 2018 GP LLC 0001818701
MPM ASSET MANAGEMENT INVESTORS BV2018 LLC 0.1% 77,911 77,911 0 /s/ Ansbert Gadicke Managing director of MPM BioVentures 2018 LLC, the manager of MPM Asset Management Investors BV2018 LLC 0001734817
MPM BioVentures 2018 LLC 7.9% 4,235,403 0 4,235,403 /s/ Ansbert Gadicke Managing Director 0001818702
MPM ONCOLOGY INNOVATIONS FUND LP 1.6% 847,080 847,080 0 /s/ Ansbert Gadicke Manager of MPM Oncology Innovations Fund GP LLC, the general partner of MPM Oncology Innovations Fund, L.P. 0001719960
MPM Oncology Innovations Fund GP LLC 1.6% 847,080 0 847,080 /s/ Ansbert Gadicke Manager 0001857903
Oncology Impact Private Investment Fund 2, L.P. 9.1% 4,835,872 4,835,872 0 /s/ Ansbert Gadicke Managing member of MPM Oncology Investments 2 LLC, the general partner of Oncology Impact Private Investment Fund 2, L.P. 0002104306
MPM Oncology Investments 2 LLC 9.1% 4,835,872 0 4,835,872 /s/ Ansbert Gadicke Managing Member
MPM ASSET MANAGEMENT LLC 0.6% 341,709 341,709 0 /s/ Ansbert Gadicke Manager 0001263048
ANSBERT GADICKE 19% 10,260,064 0 10,260,064 /s/ Ansbert Gadicke Ansbert Gadicke 0001134655
LUKE EVNIN 9.5% 5,082,483 0 5,082,483 /s/ Luke Evnin Luke Evnin 0001134657
Todd Foley 8% 4,237,506 2,103 4,235,403 /s/ Todd Foley Todd Foley 0001473930