According to Lookonchain, the April 21 update reveals a significant net flow increase in Bitcoin ETFs, with a net inflow of 306 BTC, equivalent to $26.95 million. Fidelity has been a major contributor, adding 306 BTC to its holdings, which now total 194,578 BTC valued at $17.17 billion. Meanwhile, Ethereum ETFs reported zero net flow, indicating a current neutral market sentiment for ETH investments.