AIG and McGill Deploy AI System to Automate Follow Underwriting
AIG will deploy capacity across up to $1.6 billion in specialty insurance premiums through an AI system built with Palantir, automating decisions that brokers have traditionally made by hand.
Under the deal with McGill and Partners, AIG will provide 25% of capacity on the broker's specialty portfolio. AIG analyzed McGill's book, developed underwriting criteria, and built an AI framework to make follow decisions in real time through the broker's digital platform.
In subscription market deals, a lead underwriter prices the risk and sets terms. Follow underwriters then decide whether to accept a share at those conditions. The process has historically required weeks of phone calls and emails to gather enough capacity.
How the System Works
AIG worked with Palantir to create what's called an ontology-a structured map translating raw data into relationships between entities, risks, and exposures. The system generates near real-time insights on limit deployment, modeled risk outputs, and loss information.
McGill and Partners built the digital infrastructure needed for this arrangement since launching in 2019. The broker's platform gave AIG the data access required to evaluate the portfolio and train the AI system.
The approach mirrors AIG's December 2025 partnership with Amwins and Blackstone on Lloyd's Syndicate 2479, where AIG used Palantir's Foundry and large language model agents to analyze millions of data points across a delegated authority portfolio.
Broader AI Rollout at AIG
AIG has been scaling AI for insurance operations across multiple lines of business. Its Underwriting by AIG Assist tool now covers seven lines of business, with Lexington reporting a 26% increase in submission counts and a 35% improvement in its submit-to-bind ratio for middle market property.
McGill and Partners has signed similar digital capacity deals with other carriers. In December 2025, the broker launched an arrangement with AEGIS London using automated quoting and binding for follow placements, and previously struck a comparable deal with AXA XL.
Steve McGill, CEO of McGill and Partners, said the collaboration could alter how the subscription market operates, strengthening the position of lead underwriters while changing how capacity is offered to clients.
Peter Zaffino, AIG's chairman and CEO, said the evolution of AI and large language models is reshaping risk analytics. He added that AIG sees "significant opportunity to deliver greater efficiency to the subscription market while giving clients easier access to high-quality insurance solutions."
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