Base metals close lower in overnight session; Shanghai lead buckles trend

The split between Shanghai lead's gain and the broader complex's softness is the notable detail here — a single metal bucking an otherwise uniform drift lower suggests idiosyncratic positioning rather than a shared macro driver. Moves of this size are marginal, so the takeaway is less about direction than about breadth: the weakness is consistent across copper, aluminum, zinc and nickel, which matters more for sentiment than any one contract's percentage. Whether lead's outperformance persists against that backdrop is the open question worth tracking.