Quantum-Si

Closed (deSPAC)

Profile in progress

What it is: Incorporated Quantum-Si is focused on revolutionizing the growing field of proteomics
What it’s doing now: Merging with HighCape Capital Acquisition Corp. (CAPA) — closed (despac).
What you should know: Data is still being assembled for this company — what is shown below is everything we have verified so far.

The business, per its filings

SEC primary

Incorporated Quantum-Si is focused on revolutionizing the growing field of proteomics. The Company's suite of technologies is powered by a first-of-its-kind semiconductor chip designed to enable single-molecule next-generation protein sequencing and digitize proteomic research in order to advance drug discovery and diagnostics beyond what has been possible with DNA sequencing. Learn more at www.quantum-si.com .

What the company says about itself

Web research — not audited

Quantum-Si is a company founded in 2013 that pioneers single-molecule protein sequencing to make proteomics accessible. Their flagship product, the Platinum Pro, is a compact benchtop instrument that delivers single-amino-acid resolution without requiring dedicated lab space or bioinformatics expertise. The technology uses kinetic signatures to detect post-translational modifications, protein variants, and enables applications like antibody characterization and protein barcoding for drug development.

Markets:: Proteomics | Drug Development | Research
Products:: Platinum Pro | Platinum | Library Prep Kit V3 | Protein Sequencing Kits | Barcoding Kits | Platinum Analysis software

What our web check found

[WEB-INTEL 2026-08-26] 3 finding(s) · web source asserts a FILING-ONLY figure (deadline / trust / status / floor / price) and it was NOT stored: "The transaction values Quantum-SI at approximately $1.46 billion" [https://www.mintz.com/industries-practices/case-studies/mintz-advises-quantum-si-146b-spac-merger] · web source asserts a FILING-ONLY figure (deadline / trust / status / floor / price) and it was NOT stored: "The deal values Quantum-Si at $925 million." [https://finance.yahoo.com/news/ark-invest-backs-spac-merger-145943970.html] · web source asserts a FILING-ONLY figure (deadline / trust / status / floor / price) and it was NOT stored: "is $1.460 billion" [https://www.quantum-si.com/press-releases/quantum-si-a-pioneer-in-semiconductor-chip-based-proteomics-to-combine-with-highcape-capital-acquisition-corp/]

Source: https://www.quantum-si.com/ · captured Aug 26, 2026 · marketing claims are reported as claims, never merged into the filed figures above.

The deal it’s entering

Quantum-Si is merging with HighCape Capital Acquisition Corp. (CAPA) currently marked Closed (deSPAC).

Headline equity value	—
PIPE	≈ $425M · unsourced

Structure per SEC accession(s) 0001104659-21-029881, 0001816431-25-000060. How to read these numbers: headline vs effective valuation · what a definitive agreement commits

What exactly is being valued, and at what

Common questions

Is Quantum-Si going public?

Quantum-Si has an approved merger with the SPAC HighCape Capital Acquisition Corp. (CAPA). Deal status: Closed (deSPAC).

Does Quantum-Si have revenue?

The filings we've parsed don't state a usable revenue figure yet; this profile is updated as new documents land.

Educational content, not investment advice.