A possible new force in Italian banking has begun to take shape, after regional lender Banco BPM SpA took a major stake in rival Banca Monte dei Paschi di Siena SpA.

Italy has begun to pave the way for a third big banking group in the country by selling a chunk of state-owned Monte dei Paschi di Siena (MPS) to rival Banco BPM and the fund manager partner of both lenders.

Shares in Monte dei Paschi di Siena jumped 9 per cent in early trading on Thursday after the Italian government sold a 15 per cent stake in the bailed-out lender for €1.1bn, bringing in rival Banco BPM as a shareholder.