Bitcoin has been positively correlated with the S&P 500 index since early 2020, according to Refinitiv data, meaning they broadly move up and down together. Their correlation coefficient has risen to 0.41 now from 0.1 in September, where zero means no correlation and 1 implies perfectly synchronised movement.
By contrast, that coefficient was just 0.01 in 2017-2019, according to an International Monetary Fund analysis published this month.
"Now that bitcoin is not entirely held by early adopters, it's sitting in a 60/40 type portfolio," said Ben McMillan, chief investment officer of Arizona-based IDX Digital Assets, referring to the institutional strategy of allocating 60% of a portfolio to relatively risky equities and 40% towards bonds.