---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-22-304803"
form_type: "8-K"
ticker: "MCRB"
cik: "0001609809"
company_name: "Seres Therapeutics, Inc."
filed_at: "2022-12-14T23:59:59+00:00"
generated_at: "2026-06-21T04:47:27.676838+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Seres amends Cambridge lease: surrenders 14,760 sq ft, extends 68,636 sq ft to Jan 2030

## Summary
- Surrenders 14,760 rentable sq ft of office/lab space effective Nov 12, 2023.
- Extends lease on remaining 68,636 sq ft to Jan 13, 2030; initial rent $122/sq ft/yr with 3% annual escalations.
- Receives 2-month free rent at start of extension and $1.72M tenant improvement allowance ($25/sq ft).
- Rentable area after surrender: 68,636 sq ft; tenant's pro rata share in building becomes 36.39%.

## SEC filing metadata
- accession: 0001193125-22-304803
- form_type: 8-K
- ticker: MCRB
- cik: 0001609809
- company_name: Seres Therapeutics, Inc.
- filed_at: 2022-12-14T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1609809/000119312522304803/0001193125-22-304803-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1609809/000119312522304803/d399120d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-22-304803
- JSON: https://secwatch.observer/filing/0001193125-22-304803.json
- Plain text: https://secwatch.observer/filing/0001193125-22-304803.txt

## Key facts
- Material Agreements
  Seres Therapeutics, Inc. amended First Amendment to Lease with BMR-Sidney Research Campus LLC (effective 2022-12-09).
  - Action: amendment
  - Agreement: lease
  - Counterparty: BMR-Sidney Research Campus LLC
  - Effective: 2022-12-09
  source text: On December 9, 2022, Seres Therapeutics, Inc. (the “Company”) entered into the First Amendment to Lease (the “First Amendment”) with BMR-Sidney Research Campus LLC (f/k/a BMR 200-Sidney Street LLC), a Delaware limited liability company (the “Landlord”), which amends the Lease Agreement, dated November 11, 2015
  evidence_url: https://www.sec.gov/Archives/edgar/data/1609809/000119312522304803/0001193125-22-304803-index.htm

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