---
schema_version: "secwatch.filing_event.v1"
accession: "0001193805-26-001130"
form_type: "8-K"
ticker: "ARCT"
cik: "0001768224"
company_name: "Arcturus Therapeutics Holdings Inc."
filed_at: "2026-08-25T10:00:33+00:00"
generated_at: "2026-08-25T10:06:03.979994+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Arcturus to present ARCT-810 OTC deficiency data at SSIEM 2026

## Summary
- Poster on ARCT-810 mRNA therapy for ornithine transcarbamylase deficiency at SSIEM 2026 in Helsinki on Aug 25, 2026
- Data covers dietary intake and biochemical outcomes in adolescents and adults
- Additional data and regulatory plan expected later this quarter
- Presentation furnished as Exhibit 99.1 to Form 8-K

## SEC filing metadata
- accession: 0001193805-26-001130
- form_type: 8-K
- ticker: ARCT
- cik: 0001768224
- company_name: Arcturus Therapeutics Holdings Inc.
- filed_at: 2026-08-25T10:00:33+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1768224/000119380526001130/0001193805-26-001130-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1768224/000119380526001130/e665725_8k-arct.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193805-26-001130
- JSON: https://secwatch.observer/filing/0001193805-26-001130.json
- Plain text: https://secwatch.observer/filing/0001193805-26-001130.txt

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