According to @rovercrc, a whale sold 38,582 ETH at $3,548 and later bought back at $4,010, highlighting a large round-trip at higher prices (source: @rovercrc on X). Based on those reported figures, the sale was roughly $136.89 million notional and the buyback about $154.71 million, a $462 per-ETH gap equating to approximately $17.82 million if the same 38,582 ETH size was repurchased (calculation using the prices and size reported by @rovercrc on X).