A bid for J Sainsbury Plc (SBRY.L) may not be imminent, but its property assets, growth plans and uncertainty over the intentions of its top investor could keep it a focus of speculation, and its stock in demand.

Shares in Britain's third-biggest supermarket group leapt as much as 20 percent on Thursday as chatter swirled that its largest investor, Qatar's sovereign wealth fund, was mounting a new takeover bid after a previous attempt failed in 2007.

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