---
schema_version: "secwatch.filing_event.v1"
accession: "0001829126-26-002191"
form_type: "8-K"
ticker: "QUMS"
cik: "0002070900"
company_name: "Quantumsphere Acquisition Corp"
filed_at: "2026-03-11T23:59:59+00:00"
generated_at: "2026-05-15T15:15:03.791221+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Quantumsphere amends underwriting agreement to cap deferred commission at 4% of trust post-redemptions

## Summary
- Deferred commission set at 4.00% of gross proceeds (up to $2,880,000 from Firm Units, up to $432,000 from Option Units).
- Commission payable from trust upon business combination, capped at 4.00% of trust balance after redemptions.
- Underwriters may waive commission prior to business combination; if no deal, forfeit rights to trust distribution.

## SEC filing metadata
- accession: 0001829126-26-002191
- form_type: 8-K
- ticker: QUMS
- cik: 0002070900
- company_name: Quantumsphere Acquisition Corp
- filed_at: 2026-03-11T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2070900/000182912626002191/0001829126-26-002191-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2070900/000182912626002191/quantumsphereacq_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001829126-26-002191
- JSON: https://secwatch.observer/filing/0001829126-26-002191.json
- Plain text: https://secwatch.observer/filing/0001829126-26-002191.txt

## Key facts
- Material Agreements
  Quantumsphere Acquisition Corp amended Amendment No. 1 to the Underwriting Agreement with Polaris Advisory Partners, LLC (as representative of the several underwriters) and Kingswood Capital Partners LLC (effective 2026-03-03).
  - Action: amendment
  - Agreement: underwriting
  - Counterparty: Polaris Advisory Partners, LLC (as representative of the several underwriters) and Kingswood Capital Partners LLC
  - Effective: 2026-03-03
  source text: On March 3, 2026, Quantumsphere Acquisition Corporation (the “Company”) entered into Amendment No. 1 to the Underwriting Agreement (the “Amendment”) with Polaris Advisory Partners, LLC, a division of Kingswood Capital Partners LLC, as representative of the several underwriters (the “Representative”), and Kingswood Capital Partners LLC.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2070900/000182912626002191/0001829126-26-002191-index.htm

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