Bitcoin exchange-traded funds (ETFs) experienced a significant net outflow of $290.45 million on May 15. BlackRock's IBIT led the decline with a $136.28 million outflow, followed by Ark's ARKB with $52.48 million and Grayscale's GBTC with $43.64 million. Other notable outflows included Fidelity's FBTC at $39.59 million and Franklin's EZBC at $6.86 million. Several ETFs, including those from Morgan Stanley, Invesco, Valkyrie, VanEck, WisdomTree, and Grayscale Mini, reported no net flow changes.