U.S. spot Bitcoin ETFs saw $348.9 million in net outflows on March 6, according to Farside Investors, with Fidelity’s FBTC leading withdrawals at $158.5 million and BlackRock’s IBIT following with $143.5 million. The new data refines the previously reported roughly $349 million Bitcoin ETF outflow and adds that U.S. spot Ethereum ETFs also recorded $82.9 million in net withdrawals the same day. Fidelity’s FETH accounted for the largest Ethereum ETF outflow at $67.6 million, indicating that selling pressure extended across both major crypto ETF categories.