---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-001141"
form_type: "8-K"
ticker: "ASMB"
cik: "0001426800"
company_name: "ASSEMBLY BIOSCIENCES, INC."
filed_at: "2025-01-03T23:59:59+00:00"
generated_at: "2026-05-28T13:56:26.109094+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Assembly Biosciences extends sublease through Sep 2029; ROFR on additional space

## Summary
- Sublease extended to September 30, 2029 for ~20,000 sq ft in South San Francisco.
- Monthly base rent ranges from $64,945 (abated Jan 2025) to $74,537 through 2029.
- Right of first refusal to sublease additional 6th-floor space from Arsenal Biosciences.
- Sublessee may install improvements including walls, offices, and phone rooms at its cost.
- Amendment conditioned on master landlord consent; either party may terminate if not obtained within 30 days.

## SEC filing metadata
- accession: 0000950170-25-001141
- form_type: 8-K
- ticker: ASMB
- cik: 0001426800
- company_name: ASSEMBLY BIOSCIENCES, INC.
- filed_at: 2025-01-03T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1426800/000095017025001141/0000950170-25-001141-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1426800/000095017025001141/asmb-20241230.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-001141
- JSON: https://secwatch.observer/filing/0000950170-25-001141.json
- Plain text: https://secwatch.observer/filing/0000950170-25-001141.txt

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