Bitcoin rose to an intraday high of $87,374 on Sept. 21, its strongest level since late January, as short covering and institutional demand extended a recovery that returned the average U.S. Bitcoin ETF investor to profit. The cryptocurrency gained roughly 6% to 7% in 24 hours, crossed its 50-period weekly moving average and moved through the closely watched $83,000-$86,000 liquidation zone. U.S. spot Bitcoin ETFs recorded $433 million in net inflows on Sept. 18, while Strategy bought another 950 BTC, lifting its holdings to 846,000 BTC. Bitcoin remains about 31% below its Oct. 6, 2025, peak near $126,277, leaving $90,000 as the next closely watched level. Ethereum, Solana, XRP, Monero and several smaller crypto assets also advanced, although the Altcoin Season Index stood at 47, below the 75 threshold associated with Altcoin Season.