{"transactions":[{"id":3535138,"issuer":{"id":694,"kind":"organization","name":"Perspective Therapeutics, Inc.","symbol":"CATX"},"owners":[{"id":10166,"kind":"organization","name":"Lantheus Alpha Therapy, LLC","position":1,"cik":"0002010224","reported_name":"Lantheus Alpha Therapy, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH","position":2,"cik":"0001521036","reported_name":"Lantheus Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-09-08T20:51:19.000Z","date":"2026-09-04","kind":"sale","planned":false,"acquired":false,"shares":167149,"price":3.1472,"value":526051.3328,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.0448 to $3.1775, inclusive. The reporting person undertakes to provide to CATX, any security holder of CATX or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Represents securities directly held by Lantheus Alpha Therapy, LLC (\"Lantheus\"), a wholly owned indirect subsidiary of Lantheus Holdings, Inc. (\"Lantheus Holdings\"). Under SEC rules and regulations, Lantheus Holdings may be deemed to have indirect beneficial ownership of the shares held by Lantheus, which has direct beneficial ownership."}],"balance_after":11273364,"source":{"system":"sec-edgar","filing":"0002064832-26-000318","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2010224/000206483226000318/form4.xml","form_type":"4"}},{"id":3535137,"issuer":{"id":694,"kind":"organization","name":"Perspective Therapeutics, Inc.","symbol":"CATX"},"owners":[{"id":10166,"kind":"organization","name":"Lantheus Alpha Therapy, LLC","position":1,"cik":"0002010224","reported_name":"Lantheus Alpha Therapy, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH","position":2,"cik":"0001521036","reported_name":"Lantheus Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-09-08T20:51:19.000Z","date":"2026-09-03","kind":"sale","planned":false,"acquired":false,"shares":80783,"price":3.1058,"value":250895.8414,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.05 to $3.13, inclusive. The reporting person undertakes to provide to Perspective Therapeutics, Inc. (\"CATX\"), any security holder of CATX or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Represents securities directly held by Lantheus Alpha Therapy, LLC (\"Lantheus\"), a wholly owned indirect subsidiary of Lantheus Holdings, Inc. (\"Lantheus Holdings\"). Under SEC rules and regulations, Lantheus Holdings may be deemed to have indirect beneficial ownership of the shares held by Lantheus, which has direct beneficial ownership."}],"balance_after":11440513,"source":{"system":"sec-edgar","filing":"0002064832-26-000318","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2010224/000206483226000318/form4.xml","form_type":"4"}},{"id":4717,"issuer":{"id":694,"kind":"organization","name":"Perspective Therapeutics, Inc.","symbol":"CATX"},"owners":[{"id":10166,"kind":"organization","name":"Lantheus Alpha Therapy, LLC","position":1,"cik":"0002010224","reported_name":"Lantheus Alpha Therapy, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH","position":2,"cik":"0001521036","reported_name":"Lantheus Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-09-04T21:00:56.000Z","date":"2026-09-02","kind":"sale","planned":false,"acquired":false,"shares":42129,"price":3.1147,"value":131219.1963,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.025 to $3.235, inclusive. The reporting person undertakes to provide to Perspective Therapeutics, Inc. (\"CATX\"), any security holder of CATX or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Represents securities directly held by Lantheus Alpha Therapy, LLC (\"Lantheus\"), a wholly owned indirect subsidiary of Lantheus Holdings, Inc. (\"Lantheus Holdings\"). Under SEC rules and regulations, Lantheus Holdings may be deemed to have indirect beneficial ownership of the shares held by Lantheus, which has direct beneficial ownership."}],"balance_after":11521296,"source":{"system":"sec-edgar","filing":"0002064832-26-000316","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2010224/000206483226000316/form4.xml","form_type":"4"}},{"id":4680,"issuer":{"id":694,"kind":"organization","name":"Perspective Therapeutics, Inc.","symbol":"CATX"},"owners":[{"id":10166,"kind":"organization","name":"Lantheus Alpha Therapy, LLC","position":1,"cik":"0002010224","reported_name":"Lantheus Alpha Therapy, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-09-04T20:58:50.000Z","date":"2026-09-01","kind":"sale","planned":false,"acquired":false,"shares":35769,"price":3.1193,"value":111574.2417,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Effective June 14, 2024, Perspective Therapeutics, Inc. 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The reporting person undertakes to provide to CATX, any security holder of CATX or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Effective June 14, 2024, Perspective Therapeutics, Inc. (\"CATX\") effected a 1-for-10 reverse stock split of its common stock (the \"Reverse Stock Split\"). The amount of securities reported on this Form 4 has been adjusted to reflect the Reverse Stock Split."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"These sales were previously reported in Form 4s filed by Lantheus Holdings, Inc. on September 2, 2026 and September 3, 2026."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F5","text":"Represents securities directly held by Lantheus Alpha Therapy, LLC (\"Lantheus\"), a wholly owned indirect subsidiary of Lantheus Holdings, Inc. (\"Lantheus Holdings\"). Under SEC rules and regulations, Lantheus Holdings may be deemed to have indirect beneficial ownership of the shares held by Lantheus, which has direct beneficial ownership."}],"balance_after":11563425,"source":{"system":"sec-edgar","filing":"0002064832-26-000314","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2010224/000206483226000314/form4.xml","form_type":"4"}},{"id":4679,"issuer":{"id":694,"kind":"organization","name":"Perspective Therapeutics, Inc.","symbol":"CATX"},"owners":[{"id":10166,"kind":"organization","name":"Lantheus Alpha Therapy, LLC","position":1,"cik":"0002010224","reported_name":"Lantheus Alpha Therapy, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-09-04T20:58:50.000Z","date":"2026-08-31","kind":"sale","planned":false,"acquired":false,"shares":78145,"price":3.143,"value":245609.735,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Effective June 14, 2024, Perspective Therapeutics, Inc. 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The reporting person undertakes to provide to CATX, any security holder of CATX or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Effective June 14, 2024, Perspective Therapeutics, Inc. (\"CATX\") effected a 1-for-10 reverse stock split of its common stock (the \"Reverse Stock Split\"). 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