By Gilles Castonguay

MILAN--Italy's biggest insurer, Assicurazioni Generali SpA (G.MI), said Wednesday said it is selling shares representing up to 12% of asset management unit Banca Generali SpA (BGN.MI), as part of its strategy to improve its solvency ratio, or its ability to meet obligations.

Generali said in a statement it was offering up to 13.7 million ordinary shares to institutional investors, with the final terms to be set through an accelerated bookbuilding process.

"The operation...will enable Generali to optimize its capital allocation with an improvement of its Solvency I ratio," it said. At the end of 2012, its Solvency I ratio was 150%, against 117% a year earlier.

Generali, which owns a 63.5% stake in the unit, said it intends to keep control of Banca Generali, adding it had agreed to a six-month lock-up period with respect to the sale of additional shares.

UBS AG (UBSN.VX, UBS) and Mediobanca (MB.MI) are the joint global coordinators and joint bookrunners on the sale.

In Milan, Generali's shares ended down 2.7% at EUR12.15, while those of Banca Generali closed 0.68% lower at EUR14.59.

Write to Gilles Castonguay at gilles.castonguay@dowjones.com; Twitter: @GRCastonguay

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