Umbrella and excess rates rose 8.2% in the first quarter of 2026, their highest reading in four quarters, as social inflation and nuclear verdicts kept driving claims severity across commercial liability lines. Into that environment, Marsh Risk has launched MLOne, a lead umbrella casualty facility built around a single claims decision maker.
MLOne consolidates up to $30 million of lead umbrella capacity into a single quota-share block. Allianz Commercial serves as lead insurer and sole claims handler for the entire structure. The facility sits above any primary casualty program and operates on a follow-form basis.
MLOne is the third in Marsh Risk's series of follow-form excess casualty facilities. It can be combined with the firm's Bermuda-based BX1 and US-based MX1 facilities in a single program. The combination is designed to reduce contract inconsistencies across a client's casualty tower.
Muffadal Lokhandwala, US excess casualty practice leader at Marsh Risk, said the facility targets coverage clarity and placement efficiency. Clients would gain "greater coverage certainty and a more efficient placement and claims process, helping to reduce gaps and litigation risk, while improving program stability and balance sheet protection," he said.
Dan Aronson, US casualty leader at Marsh Risk, said MLOne gives clients a consistent framework across their casualty portfolios. Mary Ann Stewart, Allianz Commercial's regional head of liability in North America, said the single-decision-maker model addresses a structural need. "When insureds are navigating increasingly complex claims environments, having a single, accountable claims leader within the quota share structure makes a tangible difference, both in outcomes and in confidence," Stewart said.
The US casualty segment posted underwriting losses for 14 consecutive years. Cumulative exposure-adjusted price increases exceeded 155% since 2015, according to Guy Carpenter. Umbrella and excess layers saw the most pressure, with rates in some classes reaching double digits through mid-2025.
The elevated rate environment has made clean program structure more consequential for clients. When multiple insurers share lead umbrella responsibilities without coordinated claims decisions, conflicting positions can delay resolution and increase litigation exposure. MLOne's single-contact structure targets that friction directly.
Umbrella pricing re-accelerated to 8.2% in Q1 2026, its strongest reading in four quarters, according to the Baldwin Group. The combination of elevated rates and claims complexity makes placement efficiency a competitive differentiator.
