Glencore

Buying BHP and Rio Tinto

Follows volatile trading in Hong Kong

Global shares shed $11trn

Sovereign wealth fund hit

Investec warns on shareholder value

Mining manager praised move

Firm accused over $2.5bn share issue

Blue chips fall to lowest point since January

Mining sector suffers further falls

Old Mutual Global Investors' head of equities Richard Buxton has begun buying back into oil companies to take advantage of the undervalued mega caps.