According to @Andre_Dragosch, total US ETF assets under management are $10.7 trillion (source: Investment Company Institute), while US spot Bitcoin ETF AuM totals $154 billion (source: Bloomberg), implying a 1.4% aggregate BTC ETF allocation across US ETFs based on 154/10,700 (source: calculation using ICI and Bloomberg). @Andre_Dragosch characterizes this 1.4% share as early-stage institutional adoption (source: @Andre_Dragosch). For traders, the allocation ratio can be tracked via ICI and Bloomberg to gauge changes in institutional participation in BTC ETFs (sources: Investment Company Institute; Bloomberg).