---
schema_version: "secwatch.filing_event.v1"
accession: "0001929980-26-000372"
form_type: "8-K"
ticker: "HSPOF"
cik: "0001946021"
company_name: "Horizon Space Acquisition I Corp."
filed_at: "2026-07-21T20:20:52+00:00"
generated_at: "2026-07-21T20:22:06.576969+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Horizon Space Acquisition I issues $500K promissory note to sponsor for working capital

## Summary
- Unsecured promissory note of $500,000 issued to sponsor Horizon Space Acquisition I Sponsor Corp. on July 20, 2026.
- Note bears no interest; principal due upon consummation of business combination or expiry of the SPAC term.
- Proceeds used for general working capital until initial business combination is completed.
- Sponsor may convert note into private units at $10/unit (each unit: one ordinary share, one warrant, one right).
- If no business combination, note is repayable only from funds outside the trust account.

## SEC filing metadata
- accession: 0001929980-26-000372
- form_type: 8-K
- ticker: HSPOF
- cik: 0001946021
- company_name: Horizon Space Acquisition I Corp.
- filed_at: 2026-07-21T20:20:52+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 2.03, 3.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1946021/000192998026000372/0001929980-26-000372-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1946021/000192998026000372/hspo_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001929980-26-000372
- JSON: https://secwatch.observer/filing/0001929980-26-000372.json
- Plain text: https://secwatch.observer/filing/0001929980-26-000372.txt

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