---
schema_version: "secwatch.filing_event.v1"
accession: "0001816431-26-000064"
form_type: "8-K"
ticker: "QSI"
cik: "0001816431"
company_name: "Quantum-Si Inc"
filed_at: "2026-10-08T20:12:07+00:00"
generated_at: "2026-10-12T15:28:55.906768+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Quantum-Si detects 19 amino acids in Proteus program; targets all 20 by year-end 2026, launch in Q2 2027

## Summary
- Quantum-Si demonstrated detection of 19 amino acids in its Proteus development program, up from the 18-amino-acid developmental kit presented at the 2026 World HUPO Congress.
- Company is now deploying the 19-amino-acid capability into a developmental sequencing kit for routine use on integrated Proteus instruments by its R&D team.
- CEO Jeff Hawkins said detection of all 20 amino acids is "well within reach by year-end 2026" and that the company is "growing increasingly confident" in hitting that milestone.
- Management expects the 19-amino-acid capability to further increase Proteus sequencing performance and reiterated its commercial launch target for the second quarter of 2027.

## SEC filing metadata
- accession: 0001816431-26-000064
- form_type: 8-K
- ticker: QSI
- cik: 0001816431
- company_name: Quantum-Si Inc
- filed_at: 2026-10-08T20:12:07+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000064/0001816431-26-000064-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000064/qsi-20261008.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001816431-26-000064
- JSON: https://secwatch.observer/filing/0001816431-26-000064.json
- Plain text: https://secwatch.observer/filing/0001816431-26-000064.txt

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