---
schema_version: "secwatch.filing_event.v1"
accession: "0001816431-25-000065"
form_type: "8-K"
ticker: "QSI"
cik: "0001816431"
company_name: "Quantum-Si Inc"
filed_at: "2025-11-05T23:59:59+00:00"
generated_at: "2026-05-17T00:22:54.921260+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Quantum-Si reports Q3 2025 revenue of $552K, net loss $35.7M; Proteus prototype sequencing successful

## Summary
- Revenue $552K; gross profit $194K, gross margin 35%.
- Net loss $35.7M vs $25.3M YoY; adjusted EBITDA -$20.1M vs -$24.5M YoY.
- Successfully demonstrated sequencing on prototype Proteus system; development on track for H2 2026 launch.
- Launched v4 Sequencing Kit in early Sept; v3 Library Prep Kit for low-input samples on track for year-end 2025.
- Adjusted total operating expenses $21.4M, down from $26.0M YoY; company manages costs while funding Proteus.

## SEC filing metadata
- accession: 0001816431-25-000065
- form_type: 8-K
- ticker: QSI
- cik: 0001816431
- company_name: Quantum-Si Inc
- filed_at: 2025-11-05T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1816431/000181643125000065/0001816431-25-000065-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1816431/000181643125000065/qsi-20251105.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001816431-25-000065
- JSON: https://secwatch.observer/filing/0001816431-25-000065.json
- Plain text: https://secwatch.observer/filing/0001816431-25-000065.txt

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