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