---
schema_version: "secwatch.filing_event.v1"
accession: "0001816431-26-000046"
form_type: "8-K"
ticker: "QSI"
cik: "0001816431"
company_name: "Quantum-Si Inc"
filed_at: "2026-06-24T20:06:09+00:00"
generated_at: "2026-06-24T20:07:23.840881+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Quantum-Si signs 10-year lease for 54,374 sq ft San Diego facility; $315/sq ft tenant improvement allowance

## Summary
- Lease for 54,374 sq ft at 9955 Pacific Heights Blvd, San Diego; initial monthly base rent $315,369 ($5.80/sq ft) with 3% annual escalations.
- Rent abated for first 20 months; term 120 months starting on or before Nov 1, 2027.
- Landlord provides tenant improvement allowance of up to $17.1M ($315/sq ft) and a $19.5M letter of credit to fund construction.
- Lease supports Proteus platform development and expanded manufacturing; transition from existing San Diego lease expiring Dec 31, 2027.
- Security deposit of ~$2.1M in letter of credit; prepaid rent of $434,448.

## SEC filing metadata
- accession: 0001816431-26-000046
- form_type: 8-K
- ticker: QSI
- cik: 0001816431
- company_name: Quantum-Si Inc
- filed_at: 2026-06-24T20:06:09+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000046/0001816431-26-000046-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000046/qsi-20260618.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001816431-26-000046
- JSON: https://secwatch.observer/filing/0001816431-26-000046.json
- Plain text: https://secwatch.observer/filing/0001816431-26-000046.txt

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