Short-sellers have begun to show their disquiet over Glencore after building up a significant stake of available stock in the commodities trader, whose shares have so far failed to reach its initial listing pricing since floating on Tuesday.

The commodity giant launched its long-awaited initial public offering on Tuesday, but amid concerns of its valuation, its share price has yet to hit the 530p level at which its banking advisers set its listing price. Since the launch, it has fallen to a low of 507p in early, pre-open market trading before recovering to 522p at 12.00 GMT today.