SCHEDULE 13D/A

WEREWOLF THERAPEUTICS INC

Common Stock · CUSIP: 95075A107

Event date: 2026-01-14

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• MPM BioVentures 2014, L.P.Reported CIK 0001609492

  Shares: 1,461,054.00 · Class: 3.0%

• MPM BioVentures 2014 (B), L.P.Reported CIK 0001609493

  Shares: 97,450.00 · Class: 0.2%

• MPM Asset Management Investors BV2014 LLCReported CIK 0001609495

  Shares: 50,289.00 · Class: 0.1%

• UBS Oncology Impact Fund L.P.Reported CIK 0001691428

  Shares: 1,208,810.00 · Class: 2.5%

• MPM BioVentures 2014 GP LLCReported CIK 0001765091

  Shares: 1,558,504.00 · Class: 3.2%

• MPM BioVentures 2014 LLCReported CIK 0001765021

  Shares: 1,608,793.00 · Class: 3.3%

• Oncology Impact Fund (Cayman) Management L.P.Reported CIK 0001721036

  Shares: 1,208,810.00 · Class: 2.5%

• MPM BioImpact LLCReported CIK 0001687078

  Shares: 1,208,810.00 · Class: 2.5%

• ANSBERT GADICKEReported CIK 0001134655

  Shares: 3,368,670.00 · Class: 6.9%

• LUKE EVNINReported CIK 0001134657

  Shares: 2,159,860.00 · Class: 4.4%

• Todd FoleyReported CIK 0001473930

  Shares: 1,608,793.00 · Class: 3.3%

• MPM ASSET MANAGEMENT LLCReported CIK 0001263048

  Shares: 231,408.00 · Class: 0.5%

• MPM ONCOLOGY INNOVATIONS FUND LPReported CIK 0001719960

  Shares: 319,659.00 · Class: 0.7%

• MPM Oncology Innovations Fund GP LLCReported CIK 0001857903

  Shares: 319,659.00 · Class: 0.7%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.