SINGAPORE (Reuters) - Shares of mainboard-listed commodity firm Noble Group Ltd fell 2.7 per cent to 72.5 cents, their lowest in more than six years, on Wednesday morning.

The stock was trading at 73 cents, down 1.5 cents or 2 per cent from its previous day's close, at about 10:15am. It was among the top active counters, with about 26.74 million Noble shares having changed hands.

Hong Kong-based Noble came under attack earlier in the year from an anonymous research outfit and a short-seller for its accounting practices.

Noble's share price is headed for a third consecutive session of falls, and is down more than 35 per cent so far this year. The share price weakness comes despite Richard Elman, Noble's founder, chairman and biggest shareholder, increasing his stake in the company marginally three times over the past week.