# Quantum-Si Inc: Form SCHEDULE 13D/A, filed Aug 28, 2026

- Company: [Quantum-Si Inc](/companies/qsi.md) (CIK 1816431)
- Form: SCHEDULE 13D/A
- Filed: 2026-08-28
- Accepted by EDGAR: Aug 28, 2026, 17:35 ET
- Period: not reported
- Accession: 0001140361-26-034869
- Inline XBRL: no
- Main document: https://www.sec.gov/Archives/edgar/data/1816431/000114036126034869/xslSCHEDULE_13D_X02/primary_doc.xml
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1816431/000114036126034869/

## Sections

Sections are extracted only from 10-K and 10-Q reports. Read this filing’s documents on sec.gov. https://www.sec.gov/Archives/edgar/data/1816431/000114036126034869/xslSCHEDULE_13D_X02/primary_doc.xml

Filed Aug 28, 2026.
Source: SEC EDGAR, the filing index for accession 0001140361-26-034869. Last ingested by Listed: Nov 5, 2026, 19:47 ET. No prices; not investment advice.