Shares in newly-floated Glencore International got a boost Tuesday as a slew of UK index tracking funds bought the stock in its first day of unconditional dealing, though the shares are still below last week's 530-pence issue price.

The commodities giant raised $10bn last week in a deal giving it a starting market capitalisation of around $59bn. A 10% over-allotment will bring the total raised to $11bn, making it London's largest-ever IPO.