Mermaid Marine Australia Ltd director James Carver has decreased his indirect interest in the company by selling 4.6 million shares at a value of nearly $5.3 million in an on-market trade. He now holds 5 million shares at a value of $6.8 million and has ceased to be a substantial shareholder. West Perth-based drilling company Imdex Ltd managing director Bernie Ridgeway has decreased his indirect interest in the company by selling 1.5 million shares at a value of more than $1.6 million, in an off-market trade. He now holds 3.5 million shares at a value of nearly $3.8 million. Jubilee Mines NL director Paul Lockyer has increased his direct and indirect interest in the company by acquiring 150,000 shares valued at $750,000, through the conversion of options. He now holds 310,000 shares at a value of more than $5.2 million.