{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-23-135979","form_type":"8-K","ticker":"LNTH","cik":"0001521036","company_name":"Lantheus Holdings, Inc.","filed_at":"2023-05-04T23:59:59+00:00","discovered_at":"2026-05-14T18:03:39.223321+00:00","generated_at":"2026-06-15T21:46:09.449963+00:00","sec_items":["1.01","2.03"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Lantheus expands Bedford lease by 41,655 sq ft; total rent ~$83.4M over 15 yrs 4 mo","bullets":["Lease amendment adds 41,655 rentable sq ft in north building for office/lab use; term 15 years 4 months.","Existing 46,526 sq ft lease extended to match new term; aggregate rent ~$83.4M plus operating costs.","Landlord to reimburse up to $11.4M for tenant improvements; Lantheus Holdings guarantees obligations.","Company has two options to extend lease for additional five years each."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-23-135979","json":"https://secwatch.observer/filing/0001193125-23-135979.json","markdown":"https://secwatch.observer/filing/0001193125-23-135979.md","text":"https://secwatch.observer/filing/0001193125-23-135979.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1521036/000119312523135979/0001193125-23-135979-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1521036/000119312523135979/d306647d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-15T21:46:09.449963+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"f89c4533501cfa937518f057f5e08e3b6929b504","claim":"Lantheus Holdings, Inc. amended Lease Amendment with 201 Burlington Road Owner, LLC valued at approximately $83.4 million (effective 2023-05-04).","evidence_excerpt":"On May 4, 2023, Lantheus Medical Imaging, Inc. (the “ Company ”), a wholly owned subsidiary of Lantheus Holdings, Inc. (the “ Registrant ”), entered into a First Amendment To Lease (the “ Lease Amendment ”) with 201 Burlington Road Owner, LLC (the “ Landlord ”), which amends the Company’s existing Office Lease with the Landlord dated February 14, 2022","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1521036/000119312523135979/0001193125-23-135979-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"amendment"},{"label":"Agreement","value":"lease"},{"label":"Counterparty","value":"201 Burlington Road Owner, LLC"},{"label":"Value","value":"approximately $83.4 million"},{"label":"Effective","value":"2023-05-04"}],"fact_type":"material_agreement"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}