---
schema_version: "secwatch.filing_event.v1"
accession: "0001816431-25-000071"
form_type: "8-K"
ticker: "QSI"
cik: "0001816431"
company_name: "Quantum-Si Inc"
filed_at: "2025-11-20T23:59:59+00:00"
generated_at: "2026-05-16T18:09:43.930274+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Quantum-Si targets Proteus launch in Q4 2026 with 20-AA detection by 2027

## Summary
- Proteus product launch set for YE2026; first integrated system expected Q1 2026.
- Sequencing kit V4 detects 14 of 20 amino acids; path to 18 at launch, all 20 by 2027.
- Partnerships with Carna Biosciences (kinase profiling) and Siena Quant (ultra-low-abundance biomarkers).
- Proteus architecture yields superior SNR and alignment output vs Platinum; 80M wells per consumable.
- Recognizer pipeline scaling 4× using AI, rational design, and combinatorial methods; 8 dyes demonstrated.

## SEC filing metadata
- accession: 0001816431-25-000071
- form_type: 8-K
- ticker: QSI
- cik: 0001816431
- company_name: Quantum-Si Inc
- filed_at: 2025-11-20T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1816431/000181643125000071/0001816431-25-000071-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1816431/000181643125000071/qsi-20251119.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001816431-25-000071
- JSON: https://secwatch.observer/filing/0001816431-25-000071.json
- Plain text: https://secwatch.observer/filing/0001816431-25-000071.txt

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