U.S. Spot Bitcoin ETF Sees $2.65 Billion Net Inflow in September

Author: Timmy Shen

Compiled by Deep潮 TechFlow

DeepOcean Summary: The U.S. spot Bitcoin ETFs saw net inflows of approximately $2.65 billion in September, the second-largest monthly inflow since October 2025; analysts note that institutional demand "has not faded," with sentiment and macroeconomic data in the fourth quarter remaining key indicators to watch.

U.S. spot Bitcoin ETFs recorded net inflows of $2.65 billion in September, the second-largest monthly inflow since October 2025, with institutional demand continuing.

According to SoSoValue data, inflows in September were below the $3.52 billion recorded in August but remained significantly higher than most levels over the past year. Spot Ethereum ETFs also saw $832.43 million in inflows in September, compared to $1.85 billion in August. This September total marks the second-largest monthly inflow since their launch in August 2025.

Bitcoin ETF inflows continued on the first trading day of October, reaching $102.7 million, while Ethereum ETFs saw outflows of $55.4 million.

Zeus Research analyst Dominick John told The Block that ETF inflows indicate that institutional demand "has not faded," pointing to a more sustainable recovery.

“As the fourth-quarter bottom appears to have been established, sustained ETF inflows are signaling improved market sentiment and could set the stage for a more bullish outlook heading into the year-end quarter,” John said.