** Shares of cryptocurrency- and blockchain-related companies fall premarket

** Bitcoin BTC=, the world's biggest cryptocurrency, down 2.3% at $90,318.87, while Ether ETH= falls 4.3% to $3,199.06

** Risk sentiment weakened as fresh concerns about AI profits weighed on tech stocks

** Crypto exchange Coinbase Global COIN.O falls 2.1%, while blockchain farm operator Bitfarms Ltd BITF.O down 2.6%

** Crypto miners: Riot Platforms Inc RIOT.O and MARA Holdings MARA.O down between 2% and 2.4%, Hut 8 HUT.O and Bit Digital BTBT.O fall 3.2%

** BTC buyer Strategy MSTR.O declines 2.1%

** ProShares Bitcoin Strategy ETF BITO.P falls 2.3%, while iShares Bitcoin Trust ETF IBIT.O down 2.4%

** Up to yesterday's close, BTC down 1.4%, ETH down 0.1%

(Reporting by Utkarsh Tushar Hathi)

((utkarshtushar.hathi@thomsonreuters.com))