CATX SCHEDULE 13D/A: SEC filing

Lantheus Holdings and its subsidiaries

Filed with the SEC on Nov 12, 2026 · accession 0001193125-26-458595

CATX filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Nov 12, 2026. A report the company filed with the SEC (the US market regulator).

Summary of the filing

Lantheus Holdings and its subsidiaries filed an amended Schedule 13D reporting beneficial ownership of 4,739,011 shares, or 3.9%, of Perspective Therapeutics common stock as of November 10, 2026.

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Key details

Shares beneficially owned$4.7M

Percent of class beneficially owned$4

Reporting person / beneficial ownerLantheus Holdings, Inc.

Reporting person / parent of lantheus alphaLantheus Medical Imaging, Inc.

Direct holder of sharesLantheus Alpha Therapy, LLC

IssuerPerspective Therapeutics, Inc.

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Frequently asked questions

What did CATX file with the SEC on Nov 12, 2026?

CATX filed a SCHEDULE 13D/A (SEC filing). Lantheus Holdings and its subsidiaries filed an amended Schedule 13D reporting beneficial ownership of 4,739,011 shares, or 3.9%, of Perspective Therapeutics common stock as of November 10, 2026.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

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