SCHEDULE 13G

Perspective Therapeutics Inc

Common Stock, $0.001 par value · CUSIP: 46489V302

Event date: 2026-02-20

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 LP

  Shares: 6,049,999.00 · Class: 5.3%

• Avidity Partners Management (GP) LLC

  Shares: 6,049,999.00 · Class: 5.3%

• Avidity Capital Partners Fund (GP) LP

  Shares: 6,049,999.00 · Class: 5.3%

• Avidity Capital Partners (GP) LLC

  Shares: 6,049,999.00 · Class: 5.3%

• Avidity Private Master Fund I LP

  Shares: 5,849,999.00 · Class: 5.1%

• Michael Gregory

  Shares: 6,049,999.00 · Class: 5.3%

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