Crypto firms rise on bitcoin strength

** Shares of cryptocurrency- and blockchain-related companies gain premarket as bitcoin rises** Bitcoin , the world's largest cryptocurrency, gained 2.1% in session to trade at a little over the $84,000 mark; ether up 3.3% ** Cryptocurrency exchange Coinbase Global rises 2.7%; miners Riot Platforms , MARA Holdings gain 2.1% and 3.3%, respectively, while U.S.-listed shares of Hut 8 up 6.9%** Bitcoin miner CleanSpark increases 3.1%, while bitcoin bull MicroStrategy jumps 3.7%** iShares Bitcoin Trust rises 2.3% and ProShares Bitcoin Strategy ETF gains 2.3%** Bitcoin has lost nearly 44% of its value so far in 2025