BERLIN, April 22 (Reuters) - Helvetia HELN.S and Baloise BALN.S plan to merge into what would be Switzerland's second-largest insurance group with a combined market share of about 20%, the firms said on Tuesday.
The merger is expected to generate run-rate pre-tax cost synergies of 350 million Swiss francs ($433 million) before policyholder participation, they said.
The merged insurance group would be called Helvetia Baloise, with an anticipated closing of the deal in the fourth quarter.
($1 = 0.8086 Swiss francs)
(Writing by Miranda Murray; Editing by Tom Hogue)
((Miranda.Murray@thomsonreuters.com;))