U.S. spot bitcoin ETFs recorded $4.5 billion in net outflows in June, their worst month since launching in January 2024, per SoSoValue data. The previous record was $3.48 billion in February 2025. June's figure beat that by 29%. BlackRock's IBIT, the largest fund by assets, accounted for $3.55 billion of the monthly total alone, including $212 million on June 30, the ninth consecutive day of net outflows. Total ETF assets have fallen to about $71 billion from roughly $83 billion at the start of the month.