---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-065140"
form_type: "8-K"
ticker: "INBX"
cik: "0002007919"
company_name: "Inhibrx Biosciences, Inc."
filed_at: "2024-05-24T23:59:59+00:00"
generated_at: "2026-06-01T08:55:04.079801+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Inhibrx Biosciences spin-off registration effective; distribution May 29, merger with Sanofi May 30

## Summary
- Registration statement on Form 10 declared effective by SEC on May 24, 2024.
- Distribution of 92% of Inhibrx Biosciences shares to RemainCo holders at 1:4 ratio; effective May 29.
- RemainCo merger with Sanofi expected to close May 30, subject to conditions.
- When-issued trading under INXBV from May 28; regular-way under INXB from May 30; then INBX from May 31.

## SEC filing metadata
- accession: 0001104659-24-065140
- form_type: 8-K
- ticker: INBX
- cik: 0002007919
- company_name: Inhibrx Biosciences, Inc.
- filed_at: 2024-05-24T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2007919/000110465924065140/0001104659-24-065140-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2007919/000110465924065140/tm243190d17_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-065140
- JSON: https://secwatch.observer/filing/0001104659-24-065140.json
- Plain text: https://secwatch.observer/filing/0001104659-24-065140.txt

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