Wells Fargo expanded its exposure to spot Bitcoin ETFs in the second quarter, adding about $642 million across BlackRock's iShares Bitcoin Trust, Grayscale Bitcoin Trust and Bitwise Bitcoin ETF and taking its total holdings to roughly $1 billion, a regulatory filing showed. The increase adds to evidence that traditional financial institutions are using SEC-approved listed funds to gain Bitcoin exposure without directly holding the asset, though the filing did not say whether the positions were held for the bank's own account or for clients.