---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-239051"
form_type: "8-K"
ticker: "HZEN"
cik: "0001748945"
company_name: "Grayscale Horizen Trust (ZEN)"
filed_at: "2025-10-14T23:59:59+00:00"
generated_at: "2026-05-17T03:56:31.496234+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Grayscale parent GSOIH: Matthew Kummell resigns, Simon Koster appointed director

## Summary
- Matthew Kummell stepped down as director of GSOIH, the sole managing member of Grayscale Operating, effective Oct 13, 2025.
- Simon Koster appointed director of GSOIH; he is CSO of Digital Currency Group, managing a portfolio of 250+ early-stage firms.
- Koster also serves on boards of Foundry, Luno (since 2023), Fortitude (2024), and Yuma (2025), all Grayscale affiliates.
- No reason given for Kummell's departure; Koster's appointment approved by GSOIH on the same date.

## SEC filing metadata
- accession: 0001193125-25-239051
- form_type: 8-K
- ticker: HZEN
- cik: 0001748945
- company_name: Grayscale Horizen Trust (ZEN)
- filed_at: 2025-10-14T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1748945/000119312525239051/0001193125-25-239051-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1748945/000119312525239051/hzen-20251013.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-239051
- JSON: https://secwatch.observer/filing/0001193125-25-239051.json
- Plain text: https://secwatch.observer/filing/0001193125-25-239051.txt

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