---
schema_version: "secwatch.filing_event.v1"
accession: "0001829126-25-005919"
form_type: "8-K"
ticker: "QUMS"
cik: "0002070900"
company_name: "Quantumsphere Acquisition Corp"
filed_at: "2025-08-07T23:59:59+00:00"
generated_at: "2026-05-17T18:32:36.812473+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Quantumsphere closes $82.8M IPO including full over-allotment; units begin trading

## Summary
- Closed IPO of 8,280,000 units at $10.00/unit, including full exercise of over-allotment, for gross proceeds of $82.8M.
- Net proceeds of $82.8M placed in trust account for benefit of public shareholders.
- Simultaneous private placement of 228,650 units to sponsor Whiteowl Holdings for $2.2865M.
- Appointed Wei (Victor) Zhang, Daniel M. McCabe, and Qi Gong to board and audit/compensation committees.
- Units trade on Nasdaq under QUMSU; ordinary shares and rights expected to trade separately as QUMS and QUMSR.

## SEC filing metadata
- accession: 0001829126-25-005919
- form_type: 8-K
- ticker: QUMS
- cik: 0002070900
- company_name: Quantumsphere Acquisition Corp
- filed_at: 2025-08-07T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 1.01, 3.02, 5.02, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2070900/000182912625005919/0001829126-25-005919-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2070900/000182912625005919/quantumsphereacq_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001829126-25-005919
- JSON: https://secwatch.observer/filing/0001829126-25-005919.json
- Plain text: https://secwatch.observer/filing/0001829126-25-005919.txt

## Key facts
- Governance Changes
  Quantumsphere Acquisition Corp: Adopted Third Amended and Restated Memorandum and Articles of Association (effective 2025-08-05).
  - Change: charter amendment
  - Effective: 2025-08-05
  source text: On August 5, 2025, the Company adopted its Third Amended and Restated Memorandum and Articles of Association.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2070900/000182912625005919/0001829126-25-005919-index.htm

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