---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-087513"
form_type: "8-K"
ticker: "SBXD"
cik: "0002015947"
company_name: "SilverBox Corp IV"
filed_at: "2025-09-04T23:59:59+00:00"
generated_at: "2026-05-17T08:22:37.851308+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# SilverBox Corp IV: S-4 filed for business combination with Parataxis

## Summary
- Parataxis Holdings Inc. filed an S-4 Registration Statement with the SEC on Sept 3, 2025, for the proposed combination with SilverBox Corp IV.
- The S-4 includes a preliminary proxy statement for SilverBox shareholders and a prospectus for Pubco.
- The filing provides additional information about the terms, risks, and conditions of the business combination.
- Completion of the transaction requires approval by SilverBox shareholders and other customary closing conditions.
- Shareholders are urged to read the definitive proxy statement/prospectus when available for full details.

## SEC filing metadata
- accession: 0001104659-25-087513
- form_type: 8-K
- ticker: SBXD
- cik: 0002015947
- company_name: SilverBox Corp IV
- filed_at: 2025-09-04T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2015947/000110465925087513/0001104659-25-087513-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2015947/000110465925087513/tm2525283d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-087513
- JSON: https://secwatch.observer/filing/0001104659-25-087513.json
- Plain text: https://secwatch.observer/filing/0001104659-25-087513.txt

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