Grayscale Ethereum Mini Trust ETF 8-K

What Happened

• Grayscale Ethereum Mini Trust ETF (ETH) filed an 8-K (Item 8.01) reporting that CoinDesk Indices, Inc. — the Index Provider for the CoinDesk Ether Price Index (ETX) — added Bitstamp by Robinhood ("Bitstamp") as a Constituent Trading Platform effective December 21, 2025.
• The Index Provider did not remove any trading venues in its scheduled quarterly review. As of the filing date (Dec 23, 2025), the Constituent Trading Platforms in the Index are Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini, and Bitstamp. The filing was signed by Edward McGee, CFO of Grayscale Investments Sponsors, LLC.

Key Details

• Index change effective date: December 21, 2025.
• New Constituent Trading Platform added: Bitstamp by Robinhood ("Bitstamp").
• No platforms were removed in the quarterly review.
• Constituent list now: Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini, Bitstamp.

Why It Matters

• The CoinDesk Ether Price Index provides the Index Price used by the Trust to value Ethereum exposure; adding or removing constituent trading venues can change the data sources that determine that Index Price.
• For retail investors, this is a procedural update about where price data comes from — CoinDesk may continue to add or remove venues as they meet or fail liquidity and other criteria, which could modestly affect index calculations but does not itself change the Trust’s investment objective.