Spot Bitcoin and Ethereum ETFs experienced significant net outflows on September 17, with combined daily withdrawals totaling approximately $514 million. Bitcoin ETFs saw outflows of 4,300 BTC ($328 million), while Ethereum ETFs recorded substantially higher volume outflows of 76,217 ETH ($186.28 million). The negative trend extends to the weekly timeframe, with Bitcoin ETFs posting seven-day net outflows of 12,061 BTC ($919.92 million) and Ethereum ETFs seeing 32,343 ETH ($79.05 million) in withdrawals over the same period. Both asset classes remain in a sustained outflow cycle across daily and weekly metrics.