---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-201353"
form_type: "8-K"
ticker: "COGT"
cik: "0001622229"
company_name: "Cogent Biosciences, Inc."
filed_at: "2025-09-11T23:59:59+00:00"
generated_at: "2026-05-17T06:53:02.539461+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Cogent Biosciences signs 7yr10mo lease for new Waltham HQ at $32/sq ft

## Summary
- Leases 31,518 sq ft at 180 Third Avenue, Waltham, MA as new corporate headquarters, replacing existing HQ.
- Term of 7 years 10 months starting expected May 2026; initial rent $32/sq ft with $1/sq ft annual increases.
- Rent abatement for first 5 months; security deposit of ~$336,000 via letter of credit.
- One option to extend lease for an additional 5 years.
- Landlord performing turnkey buildout; no material tenant improvement costs for Cogent.

## SEC filing metadata
- accession: 0001193125-25-201353
- form_type: 8-K
- ticker: COGT
- cik: 0001622229
- company_name: Cogent Biosciences, Inc.
- filed_at: 2025-09-11T23:59:59+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, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1622229/000119312525201353/0001193125-25-201353-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1622229/000119312525201353/d947118d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-201353
- JSON: https://secwatch.observer/filing/0001193125-25-201353.json
- Plain text: https://secwatch.observer/filing/0001193125-25-201353.txt

## Key facts
- Debt Financings
  Cogent Biosciences, Inc. incurred lease obligation with BP THIRD AVENUE LLC maturing seven (7) years and ten (10) months from the Commencement Date.
  - Instrument: lease obligation
  - Counterparty: BP THIRD AVENUE LLC
  - Maturity: seven (7) years and ten (10) months from the Commencement Date
  - Event: incurrence
  source text: On September 5, 2025, Cogent Biosciences, Inc. (“Cogent”) and BP THIRD AVENUE LLC, an affiliate of Boston Properties (the “Landlord”), entered into a lease agreement (the “Lease”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1622229/000119312525201353/0001193125-25-201353-index.htm

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