Earlier this month, the California Supreme Court agreed to review Montrose Chemical Corporation’s appeal from a September appellate court ruling that rejected Montrose’s preferred “vertical exhaustion” method of exhausting excess-layer policies in favor of a policy-by-policy review to determine which policies are triggered. The California high court’s grant of Montrose’s petition for review is potentially significant in clarifying the appropriate excess policy exhaustion trigger under California law, not to mention in addressing a significant insurer defense in Montrose’s longstanding coverage dispute over environmental insurance coverage, which has been winding its way through California courts for more than 25 years.

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A Missouri appellate panel recently upheld a lower court’s ruling in favor of the insured that an “all-sums” allocation would apply to determining exhaustion of the insured’s liability insurance coverage and, in so holding, rejected the pro-rata, proportional allocation sought by the insurers. The appellate panel further held that coverage could be exhausted vertically.

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On Tuesday, May 3, 2016, the New York Court of Appeals held that each of several excess liability insurers can be wholly responsible for the entire extent of their policyholders’ asbestos liabilities.  The Court further held that “vertical” exhaustion would apply; rejecting the insurers’ attempt to apply “horizontal” exhaustion before upper-layer policies must respond.  The decision, in In the Matter of Viking Pump, Inc. and Warren Pumps, LLC, Insurance Appeals, comes in response to two questions certified from the Delaware Supreme Court:

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