---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-418405"
form_type: "8-K"
ticker: "GIW"
cik: "0002080019"
company_name: "GigCapital8 Corp."
filed_at: "2026-10-09T10:05:31+00:00"
generated_at: "2026-10-12T15:20:45.307015+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# GigCapital8, Quantisimo sign definitive merger; WISeQey/SEALSQ quantum platform valued ~$666M, to list on Nasdaq as QSMO

## Summary
- Definitive merger signed Oct 8, 2026: WISeQey and SEALSQ to receive 66,610,000 PubCo shares, implying ~$666.1M pro forma equity value at $10.00/share and majority ownership of PubCo.
- Closing requires at least $15M cash: GigCapital8 trust proceeds after redemptions plus any PIPE, with matching cash from SEALSQ receiving additional PubCo shares at $10.00 each.
- Expected to close Q1 2027; PubCo Quantisimo Holding Corp. to list on Nasdaq Capital Market as 'QSMO'. GigCapital8 Class A shares exchange 1:1; five rights convert to one PubCo share.
- WISeQey, SEALSQ and GigCapital8's sponsor signed six-month lock-ups; sponsor to vote for the deal and not redeem. GigCapital8's board unanimously recommends the transaction.
- Quantisimo combines Miraex SA, SEALCOIN AG, WeCan Group SA and WISeSat.Space (Nasdaq: SAIQ); CEO Carlos Moreira cites 'Root to Qubit' sovereign quantum platform.

## SEC filing metadata
- accession: 0001193125-26-418405
- form_type: 8-K
- ticker: GIW
- cik: 0002080019
- company_name: GigCapital8 Corp.
- filed_at: 2026-10-09T10:05:31+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2080019/000119312526418405/0001193125-26-418405-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2080019/000119312526418405/giwwu-20261008.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-418405
- JSON: https://secwatch.observer/filing/0001193125-26-418405.json
- Plain text: https://secwatch.observer/filing/0001193125-26-418405.txt

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