Hammerson warned prospective predators yesterday that it would look only at an offer that fully valued the FTSE 100 shopping centre and London offices developer-owner. The Times. The Guardian. Daily Telegraph

Hammerson owns property worth £6bn, but believes its investment portfolio, including plans for a massive office complex east of Broadgate at Bishopsate Goodsyard, is worth a further £6bn.

Europe’s largest property group, Unibail, and GE Real Estate have been mooted as a predador for Hammerson, as has

John Nelson, Hammerson’s chairman, told its annual general meeting that it was not its policy to comment on market rumour, but added that its portfolio has 'the potential to double the size of the company'. Hammerson executives said it had not received any approaches from third parties, but the shares rose 44p to £16.00, for a £4.6bn market value.

Analysts interpreted that to mean the company may be up for sale, and the shares climbed 44p to 1600p.