(Adds Prelios 2013 results, details)
MILAN, April 9 (Reuters) - Pirelli said on Wednesday it would increase its stake in Italian real estate company Prelios following the conversion of a bond underwritten by the tyre maker.
Earlier in the day Prelios said it posted a 2013 loss of 333 million euros, more than one third of its capital.
This will trigger an automatic conversion of a 234 million euro ($324 million) bond issued last year in the framework of a debt restructuring for the real estate group.
Pirelli's stake in Prelios will grow to 29 percent from a current 13 percent, the company said in a statement.
The company said, however, it would seize any opportunity to sell its shareholding in the real estate group, as its strategic focus remained on tyres.
Pirelli has underwritten the largest part of the bond, with Italian lenders UniCredit, Intesa Sanpaolo, Banca Popolare di Milano and Banca Monte dei Paschi among the other bondholders, Prelios said in a separate statement.
($1 = 0.7234 Euros) (Reporting by Francesca Landini, editing by David Evans)