The unnamed new investor previously subscribed for bonds worth $10 million, but has now upped this it $15 million.

At the start of April, Chaarat announced the $10 million convertible bond issue and a placing of $1 million ordinary shares at an issue price of 30p (US37.9c), which at the time was at a premium of about 4% to the closing price of 28.8p/share on March 29.

It said at the time the $11 million completed Chaarat's near-term funding plans, though it was considering additional subscriptions of up to $5 million from current shareholders and new investors.

Chaarat said the date it expected to receive the funds for the convertible bonds had been delayed from May 31 to the end of June.

The company's shares (AIM:CGH) rose 7.02% Monday to 31.46p/share, up from 26.4p at the start of the year.