UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 20, 2025 Perspective Therapeutics, Inc. (Exact name of Registrant as Specified in Its Charter) (Former Name or Former Address, if Changed Since Last Report) (State or Other Jurisdiction of Incorporation) Delaware 001-33407 41-1458152 (Commission File Number) (IRS Employer Identification ...