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US Spot Bitcoin ETF Inflows Slow Sharply Following Late September Surge

Capital flows into US spot Bitcoin exchange-traded funds have cooled, adding roughly $232 million across 13 trading sessions after a $1.7 billion burst in September.

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Inflows into US spot Bitcoin exchange-traded funds have decelerated significantly following a two-day surge on September 21 and 22, when funds absorbed $1.7 billion. Over the subsequent 13 trading sessions, net additions totaled approximately $232 million, according to data from SoSoValue.

The slowdown culminated in net outflows of $681 million between October 5 and October 9, ending a three-week streak of net deposits. During that same window, spot Ethereum ETFs recorded $542 million in net withdrawals. Total net assets across Bitcoin funds contracted from $110.77 billion to $105.84 billion, driven by both capital redemptions and softer underlying prices.

Fund performance remained heavily concentrated. BlackRock's iShares Bitcoin Trust accounted for $22.38 million in inflows on Friday, bringing its total holdings to $66.3 billion, or roughly 63% of total spot ETF assets. In contrast, Fidelity's Wise Origin Bitcoin Fund shed $3.58 million, while nine other funds logged zero flows and Grayscale's GBTC saw cumulative outflows reach $27.94 billion.

Trading activity also contracted, with Friday's volume dropping to $1.44 billion, the lowest level in 13 sessions. With spot ETFs holding approximately 6.38% of Bitcoin's market capitalization, institutional participation has moderated as market sentiment dipped into fear territory.

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