Tata Motors shares fall 4%. Here’s why investors are worried about $4.5 billion Iveco gamble

Tata Motors slumps 4% on reports of $4.5 bn bid for Italy’s Iveco.

Deal could be Tata Group's 2nd-biggest buy after Corus acquisition.

Market fears over-leverage as JLR, emission upgrades strain finances.

UBS retains 'Sell'; warns of rising debt due to open offer, cash gap.