Grayscale Zcash Trust (ZEC) 8-K Filing Summary

This report details a change in the Digital Asset Trading Platforms used for the Grayscale Zcash Trust (ZEC). Effective December 21, 2025, CoinDesk Indices, Inc. removed Bitfinex from the CoinDesk Zcash Price Index (ZCX) due to insufficient liquidity. Consequently, the Index now comprises Coinbase, Kraken, and Gemini. The Index Provider retains the right to modify the constituent trading platforms or calculation methodology at any time. These changes are subject to scheduled quarterly reviews, as outlined in the Trust’s Annual Report on Form 10-K.