BTC ▲ +5.5% - Grayscale Bitcoin Mini Trust ETF $BTC trading above 80k Grayscale Bitcoin Mini Trust (BTC) rose 5.5% today as Bitcoin itself traded above the $80,000 mark, a significant psychological and technical milestone that often attracts momentum-driven buying. The ETF's price movement directly reflects underlying Bitcoin strength, making it a proxy for the cryptocurrency's gains during the session. 18-SEP-2026 10:30 AM ET