Natural catastrophes, dominated by a typhoon in Japan, resulted in preliminary claims of $1.1 billion (£839.7 million) in the third quarter, Swiss Re said.
Man-made disasters, like the collapse of a bridge in Italy's Genoa, resulted in an additional $300 million in claims.
"The cumulate losses for the first nine months are broadly in line with year-to-date expectations," the company said.
Swiss Re cautioned that the estimates were subject to a "higher than usual degree of uncertainty" as the claims process continues.
Swiss Re is due to publish quarterly financial results on Nov. 1.
(Reporting by Tom Sims; Editing by Maria Sheahan)