---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-051595"
form_type: "8-K"
ticker: "CSTAF"
cik: "0001834032"
company_name: "Constellation Acquisition Corp I"
filed_at: "2025-06-05T23:59:59+00:00"
generated_at: "2026-05-19T22:40:13.920056+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Constellation Acquisition Corp I increases sponsor promissory note by $590,000 to $2.25 million

## Summary
- On June 5, 2025, amended promissory note with sponsor, increasing principal from $1.66M to $2.25M (increase of $590,000).
- Note is unsecured, bears no interest, and matures upon closing of initial business combination.
- Amendment restates drawdown mechanism; up to $2.195M additional draws available in aggregate.
- The note is with Constellation Sponsor LP, the company's sponsor.

## SEC filing metadata
- accession: 0001213900-25-051595
- form_type: 8-K
- ticker: CSTAF
- cik: 0001834032
- company_name: Constellation Acquisition Corp I
- filed_at: 2025-06-05T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1834032/000121390025051595/0001213900-25-051595-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1834032/000121390025051595/ea0244051-8k_constell1.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-051595
- JSON: https://secwatch.observer/filing/0001213900-25-051595.json
- Plain text: https://secwatch.observer/filing/0001213900-25-051595.txt

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