---
schema_version: "secwatch.filing_event.v1"
accession: "0001816431-26-000032"
form_type: "8-K"
ticker: "QSI"
cik: "0001816431"
company_name: "Quantum-Si Inc"
filed_at: "2026-05-07T23:59:59+00:00"
generated_at: "2026-05-14T21:58:57.071511+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Quantum-Si Q1 net loss widens to $21.7M; Proteus sequencing milestones on track

## Summary
- Revenue of $258,000, gross margin 29%; net loss $21.7M vs $19.2M YoY.
- Adjusted EBITDA negative $20.1M; adjusted operating expenses $21.4M.
- Achieved automated sequencing runs on integrated Proteus instruments.
- Current kit detects 17 amino acids; first customer samples sequenced on prototype.
- Anticipates commercial launch end of 2026; early access sites this summer.

## SEC filing metadata
- accession: 0001816431-26-000032
- form_type: 8-K
- ticker: QSI
- cik: 0001816431
- company_name: Quantum-Si Inc
- filed_at: 2026-05-07T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000032/0001816431-26-000032-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000032/qsi-20260507.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001816431-26-000032
- JSON: https://secwatch.observer/filing/0001816431-26-000032.json
- Plain text: https://secwatch.observer/filing/0001816431-26-000032.txt

## Source-grounded claims
- claim_id: 3a803ddbd37f4b025a86e04ba05c498f9a21fb3d
  claim: Quantum-Si Inc reported the first quarter ended March 31, 2026 results: revenue $258,000, net income $21.7 million.
  evidence_excerpt: For the first quarter of 2026, the Company recorded revenue of $258,000. Gross profit was $74,000 and gross margin was 29%. Total operating expenses were $24.1 million in the first quarter of 2026, compared to $25.6 million for the same period in the prior year. Adjusted total operating expenses were $21.4 million in the first quarter of 2026 compared to $22.9 million for the same period in the prior year.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1816431/000181643126000032/0001816431-26-000032-index.htm

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