---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-101663"
form_type: "8-K"
ticker: "GBTC"
cik: "0001588489"
company_name: "Grayscale Bitcoin Trust ETF"
filed_at: "2025-08-04T23:59:59+00:00"
generated_at: "2026-05-17T21:27:24.696369+00:00"
event_type: "leadership"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Grayscale appoints founder Barry Silbert as Board Chairman, expands management team

## Summary
- Barry Silbert appointed Chairman of the Board; Mark Shifke steps down as Chairman but remains director.
- Four new executives: Diana Zhang (COO), Ramona Boston (CMO), Andrea Williams (CCO), Maxwell Rosenthal (CHRO).
- Grayscale manages over $35B in AUM across more than three dozen products, including Bitcoin and Ethereum ETFs.
- Company considering further board expansion to include independent directors.
- Silbert is founder and CEO of DCG, Grayscale's parent company.

## SEC filing metadata
- accession: 0000950170-25-101663
- form_type: 8-K
- ticker: GBTC
- cik: 0001588489
- company_name: Grayscale Bitcoin Trust ETF
- filed_at: 2025-08-04T23:59:59+00:00
- event_type: leadership
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1588489/000095017025101663/0000950170-25-101663-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1588489/000095017025101663/gbtc-20250804.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-101663
- JSON: https://secwatch.observer/filing/0000950170-25-101663.json
- Plain text: https://secwatch.observer/filing/0000950170-25-101663.txt

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