Reinsurance disputes arise when an insurer treats claims as multiple occurrences to force the insured to pay multiple retentions, but that same insurer treats the same claims as a single aggregated occurrence for purposes of reinsurance. In the past, reinsurers have found success when challenging aggregation by citing language in the reinsurance contract. However, in a recent New York case, the reinsurer was successful in challenging a cedent’s aggregation even without specific aggregation language in the reinsurance contract. The reinsurer was not required to follow its cedent’s fortunes.