Hut 8 is trading at $72.21, up 4.59%, amid gains in crypto and a positive broader market backdrop; no company-specific catalyst was confirmed. - Bitcoin gained 1.08% since its previous close, while Ethereum rose 1.31%, supporting a favorable crypto backdrop. - No Hut 8-specific announcement dated October 21 was listed on the company’s news page; its latest listed press release, from October 8, scheduled Q3 earnings. - The Nasdaq was up 0.60% pre-market.