According to @FarsideUK, Grayscale Bitcoin Trust ETF (GBTC) recorded US$0 million net daily flow on 30 Sep 2025 as shown on the Farside Bitcoin ETF flow tracker at farside.co.uk/btc (source: Farside Investors @FarsideUK tweet dated Sep 30, 2025; source: farside.co.uk/btc). On the tracker, a US$0m reading denotes no net creations or redemptions were recorded for GBTC that day, providing a neutral fund-flow print for traders monitoring BTC via ETF flows (source: farside.co.uk/btc).