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

** Bitcoin extend losses after its steepest monthly decline since the 2021 crypto crash, as renewed risk aversion drove investors out of stocks and digital assets

** Bitcoin BTCUSD falls 4.9% to $86,917.71, after shedding more than 20% in November; ether ETHUSD down 6.2% to $2,833.31

** Ether ETHUSD falls 6% to $2,840.29

** Crypto exchange Coinbase Global COIN falls 3.5%, while blockchain farm operator Bitfarms BITF drops 6.3%

** Crypto miners Riot Platforms RIOT down 4%, MARA Holdings MARA falls 4.1%, Hut 8 HUT slides 4.4% and Bit Digital BTBT drops 3.8%

** BTC buyer Strategy MSTR declines 3.9% while mining machine maker Canaan CAN down 4%

** Ether linked BTCS BTCS falls 6.9%, Bitmine Immersion Technologies BMNR down 6.4% and Sharplink Gaming SBET down 5.9%

** ProShares Bitcoin Strategy ETF BITO and iShares Bitcoin Trust ETF IBIT fall 4.6% each, while ishares Ethereum Trust ETF ETHA falls 6.5%

** Up to last close, BTC had risen 7.5% YTD, while ETH down 15.1%