---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-039043"
form_type: "8-K"
ticker: "ASMB"
cik: "0001426800"
company_name: "ASSEMBLY BIOSCIENCES, INC."
filed_at: "2023-08-07T23:59:59+00:00"
generated_at: "2026-06-12T04:01:55.504349+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Assembly Biosciences subleases ~20K sq ft HQ in South San Francisco for 24 months

## Summary
- Sublease with Arsenal Biosciences for 2 Tower Place, 7th Floor, South San Francisco; term begins Nov 1, 2023 or later.
- Monthly base rent: $109,906.50 for months 1-12; $113,753.23 for months 13-24.
- Security deposit of $219,813 required; Company pays share of operating expenses, taxes, utilities.
- Option to extend through balance of sublessor's master lease; rent capped at $6.25/sq ft with 3.5% annual increases.

## SEC filing metadata
- accession: 0000950170-23-039043
- form_type: 8-K
- ticker: ASMB
- cik: 0001426800
- company_name: ASSEMBLY BIOSCIENCES, INC.
- filed_at: 2023-08-07T23:59:59+00:00
- event_type: other
- 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/1426800/000095017023039043/0000950170-23-039043-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1426800/000095017023039043/asmb-20230804.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-039043
- JSON: https://secwatch.observer/filing/0000950170-23-039043.json
- Plain text: https://secwatch.observer/filing/0000950170-23-039043.txt

## Key facts
- Material Agreements
  ASSEMBLY BIOSCIENCES, INC. entered into Sublease with Arsenal Biosciences, Inc. valued at Monthly base rent of $109,906.50 for months 1-12 and $113,753.23 for months 13-24; security deposit (effective 2023-08-04).
  - Action: entry
  - Agreement: lease
  - Counterparty: Arsenal Biosciences, Inc.
  - Value: Monthly base rent of $109,906.50 for months 1-12 and $113,753.23 for months 13-24; security deposit
  - Effective: 2023-08-04
  source text: On August 4, 2023, Assembly Biosciences, Inc. (the “Company”) and Arsenal Biosciences, Inc. (the "Sublessor") entered into a Sublease for the Company’s lease of approximately 20,000 square feet of office and laboratory space (the "Sublease"), which will serve as the Company's corporate headquarters, located at 2 Tower Place, 7th Floor, South San Francisco, California (the "Premises").
  evidence_url: https://www.sec.gov/Archives/edgar/data/1426800/000095017023039043/0000950170-23-039043-index.htm

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