Bitcoin's 26% underperformance compared to the S&P 500 in the fourth quarter could prompt portfolio rebalancing by the end of the year, potentially boosting prices in early January, according to Vetle Lunde of K33. Despite a 2% rise in the past 24 hours, Bitcoin remains around $87,500. Lunde highlighted historical trends where Bitcoin often recovers after periods of underperformance. While altcoins and crypto stocks have seen minor gains, trading volumes in both spot and derivatives markets remain low, indicating trader caution as the year-end approaches.