---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-26-028301"
form_type: "8-K"
ticker: "SHPH"
cik: "0001757499"
company_name: "Shuttle Pharmaceuticals Holdings, Inc."
filed_at: "2026-06-11T21:00:26+00:00"
generated_at: "2026-06-11T21:02:15.735721+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Shuttle Pharmaceuticals announces 1-for-10 reverse stock split effective June 11, 2026

## Summary
- Board approved 1:10 reverse split of common stock, effective June 11, 2026.
- Every ten pre-split shares combine into one; no fractional shares issued (round up to whole share).
- Authorized shares unchanged; exercise prices of warrants, RSUs, and convertible preferred adjusted proportionally.
- New CUSIP number for post-split common stock is 825693500.
- Stockholders' approval obtained at annual meeting on May 21, 2026.

## SEC filing metadata
- accession: 0001493152-26-028301
- form_type: 8-K
- ticker: SHPH
- cik: 0001757499
- company_name: Shuttle Pharmaceuticals Holdings, Inc.
- filed_at: 2026-06-11T21:00:26+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 3.03, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1757499/000149315226028301/0001493152-26-028301-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1757499/000149315226028301/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-26-028301
- JSON: https://secwatch.observer/filing/0001493152-26-028301.json
- Plain text: https://secwatch.observer/filing/0001493152-26-028301.txt

## Key facts
- Governance Changes
  Shuttle Pharmaceuticals Holdings, Inc.: Filed a certificate of amendment to effect a 1-for-10 reverse stock split of common stock (effective 2026-06-11).
  - Change: charter amendment
  - Effective: 2026-06-11
  source text: on June 10, 2026, the Company filed a certificate of amendment to amend the certificate of incorporation of the Company (the “Certificate of Amendment”) with the Secretary of State of the State of Delaware, with an effective date of June 11, 2026 (the “Effective Date”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1757499/000149315226028301/0001493152-26-028301-index.htm

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