---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-009816"
form_type: "8-K"
ticker: "TMDX"
cik: "0001756262"
company_name: "TransMedics Group, Inc."
filed_at: "2026-01-12T23:59:59+00:00"
generated_at: "2026-05-16T10:54:39.398687+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# TransMedics signs 498,286 sq ft HQ lease in Somerville, MA; buys two adjacent parcels for $30M

## Summary
- Lease for ~498,286 sq ft at 188 Assembly Park Drive, Somerville, MA; initial annual base rent of ~$23.9M with 2% annual escalations.
- Initial term of 192 months (16 years) from Rent Commencement Date (no later than Feb 1, 2028); two 10-year renewal options.
- Landlord provided $18M letter of credit as security deposit; Tenant responsible for 100% of operating and tax expenses.
- Acquired two adjacent parcels for $15M each on Jan 8, 2026; parcels total $30M.
- New headquarters expected by Jan 1, 2028, replacing current Andover facility.

## SEC filing metadata
- accession: 0001193125-26-009816
- form_type: 8-K
- ticker: TMDX
- cik: 0001756262
- company_name: TransMedics Group, Inc.
- filed_at: 2026-01-12T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1756262/000119312526009816/0001193125-26-009816-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1756262/000119312526009816/d25695d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-009816
- JSON: https://secwatch.observer/filing/0001193125-26-009816.json
- Plain text: https://secwatch.observer/filing/0001193125-26-009816.txt

## Key facts
- Material Agreements
  TransMedics Group, Inc. entered into Lease with BioMed Realty valued at approximately $23.9 million (effective 2026-01-08).
  - Action: entry
  - Agreement: lease
  - Counterparty: BioMed Realty
  - Value: approximately $23.9 million
  - Effective: 2026-01-08
  source text: On January 8, 2026, TransMedics Group, Inc. (the “Company”) entered into a lease agreement (the “Lease”) with BioMed Realty (the “Landlord”) for the lease of approximately 498,286 square feet of space located at 188 Assembly Park Drive, Somerville, MA 02145 (the “Premises”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1756262/000119312526009816/0001193125-26-009816-index.htm

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