Cryptocurrency investors waded back into the market last week, riding a surge in Bitcoin.

Exchange-traded funds tracking Bitcoin and Ether attracted more than $3.2 billion last week, with the iShares Bitcoin Trust ETF (ticker IBIT) alone seeing a nearly $1.5 billion inflow — the most this year, data compiled by Bloomberg show. Other Bitcoin-focused funds also saw meaningful infusions, with investors adding more than $620 million to the ARK 21Shares Bitcoin ETF (ARKB) and roughly $574 million into the Fidelity Wise Origin Bitcoin Fund (FBTC).