SCHEDULE 13D/A

DIANTHUS THERAPEUTICS INC COM

Common Stock, $0.001 par value · CUSIP: 252828108

Event date: 2025-03-17

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

• Avidity Partners Management LPReported CIK 0001791827

  Shares: 3,378,939.00 · Class: 9.9%

• Avidity Partners Management (GP) LLCReported CIK 0001993910

  Shares: 3,378,939.00 · Class: 9.9%

• Avidity Capital Partners Fund (GP) LP

  Shares: 3,378,939.00 · Class: 9.9%

• Avidity Capital Partners (GP) LLC

  Shares: 3,378,939.00 · Class: 9.9%

• Avidity Master Fund LP

  Shares: 764,610.00 · Class: 2.3%

• Avidity Private Master Fund I LP

  Shares: 2,749,625.00 · Class: 8.3%

• Michael GregoryReported CIK 0001993963

  Shares: 3,378,939.00 · Class: 9.9%

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