---
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"
generated_at: "2026-06-15T21:46:09.449963+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Lantheus expands Bedford lease by 41,655 sq ft; total rent ~$83.4M over 15 yrs 4 mo

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 2.03
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-135979
- JSON: https://secwatch.observer/filing/0001193125-23-135979.json
- Plain text: https://secwatch.observer/filing/0001193125-23-135979.txt

## Key facts
- Material Agreements
  Lantheus Holdings, Inc. amended Lease Amendment with 201 Burlington Road Owner, LLC valued at approximately $83.4 million (effective 2023-05-04).
  - Action: amendment
  - Agreement: lease
  - Counterparty: 201 Burlington Road Owner, LLC
  - Value: approximately $83.4 million
  - Effective: 2023-05-04
  source text: 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_url: https://www.sec.gov/Archives/edgar/data/1521036/000119312523135979/0001193125-23-135979-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.