U.S.-based spot Bitcoin exchange-traded funds (ETFs) have experienced a significant surge in investment this week, with inflows exceeding $2.75 billion, fueled by Bitcoin’s recent all-time highs above $108,000. This marks a nearly fourfold increase from the previous week’s $608 million inflows, according to data from Farside. 5-day inflow for May is at 211.7 million while Blackrock’s Bitcoin ETF continues its eight-day streak of positive net flows. Grayscale’s GBTC led outflows with $89.2 million followed by ARK 21Shares’ ARKB with $73.9 million. This surge in inflows coincides with Bitcoin hitting a new all-time high on May 21st, surpassing its previous record of $109,000, which was only one day before BlackRock’s IBIT saw gains and continued its inflow streak.