---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-239000"
form_type: "8-K"
ticker: "GBTC"
cik: "0001588489"
company_name: "Grayscale Bitcoin Trust ETF"
filed_at: "2025-10-14T23:59:59+00:00"
generated_at: "2026-05-17T03:53:58.061004+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Grayscale Bitcoin Trust ETF sponsor appoints Simon Koster to board; Kummell steps down

## Summary
- Matthew Kummell stepped down as Director of GSOIH, the sole managing member of Grayscale sponsor.
- Simon Koster, Chief Strategy Officer at Digital Currency Group, appointed as Director effective Oct 13, 2025.
- Koster leads DCG's investment team managing over 250+ early-stage companies across 35+ nations.
- Koster also serves on boards of Foundry, Luno, Fortitude, Yuma, all affiliates of Grayscale.

## SEC filing metadata
- accession: 0001193125-25-239000
- form_type: 8-K
- ticker: GBTC
- cik: 0001588489
- company_name: Grayscale Bitcoin Trust ETF
- 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/1588489/000119312525239000/0001193125-25-239000-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1588489/000119312525239000/gbtc-20251013.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-239000
- JSON: https://secwatch.observer/filing/0001193125-25-239000.json
- Plain text: https://secwatch.observer/filing/0001193125-25-239000.txt

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