---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-078018"
form_type: "8-K"
ticker: "CTOR"
cik: "0001851484"
company_name: "CITIUS ONCOLOGY, INC."
filed_at: "2025-08-18T23:59:59+00:00"
generated_at: "2026-05-17T12:02:17.883864+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.05
calibrated_materiality_score: 0.05
confidence: "high"
source: SEC EDGAR
---

# Citius Oncology files prospectus supplement to update S-1 registration statement following 10-Q filing

## Summary
- Prospectus supplement filed August 18, 2025; original S-1 effective July 15, 2025.
- Public offering of common stock and warrants closed July 17, 2025.
- Supplement needed because Citius Oncology not yet eligible to incorporate 10-Q by reference into S-1.

## SEC filing metadata
- accession: 0001213900-25-078018
- form_type: 8-K
- ticker: CTOR
- cik: 0001851484
- company_name: CITIUS ONCOLOGY, INC.
- filed_at: 2025-08-18T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.05
- calibrated_materiality_score: 0.05
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1851484/000121390025078018/0001213900-25-078018-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1851484/000121390025078018/ea0253763-8k_citius.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-078018
- JSON: https://secwatch.observer/filing/0001213900-25-078018.json
- Plain text: https://secwatch.observer/filing/0001213900-25-078018.txt

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