On December 28th, Bloomberg ETF analyst Eric Balchunas posted on social media that ARK Invest has sold all of its remaining GBTC positions (which was ARKW's largest holding a month ago) and used half of the funds to purchase shares of ProShares Bitcoin Futures ETF (BITO), possibly as a liquidity transition tool to maintain its beta with Bitcoin at a certain level when transitioning to ARKW or ARKB.