Gage Caligaris

Gage Caligaris runs one of the fastest-growing companies in an industry most people find sleepy. Ledgebrook, the firm he founded in 2022, is a managing general agent in Excess and Surplus (E&S) insurance - the corner of the market that covers risks standard carriers decline. It is a $100 billion-plus segment in the US, and by Caligaris's own account it has been running on technology and habits decades out of date. He built Ledgebrook to change that, and the numbers suggest brokers were waiting for it: the company reached a $100 million run rate in under two years after writing its first policy.

Today the work is about scale. In June 2025, Ledgebrook closed an oversubscribed $65 million Series C led by existing investor The Stephens Group, with Duquesne, Brand Foundry, Floating Point and American Family Ventures joining in. That pushed total funding past $110 million. The plan is to hire more underwriting talent, launch new products on the platform, and take on more risk directly on behalf of carrier partners. In 2026 the effort earned Caligaris an EY Entrepreneur Of The Year New England Award.

The premise of Ledgebrook is simple to say and hard to do: put world-class engineering and seasoned insurance people in the same room. The insurance industry rarely manages it. The best underwriters do not write code; the best engineers do not understand loss curves. Caligaris spent years on the inside watching that gap slow everything down.

Wall Street, then a hard left turn

He came to insurance sideways. Caligaris studied Applied Mathematics at Harvard and used the degree to trade exotic commodity derivatives at Barclays, working as a proprietary trader in financial markets. "I have always been a math guy," he has said, and the through-line of his career is pricing things that are difficult to price. Derivatives were one version of that problem. Insurance risk turned out to be another.

The move into insurance began at Liberty Mutual, where he entered the actuarial program and, according to the company, became the fastest person ever to pass the Casualty Actuarial exams. Over more than eight years he led pricing teams across Auto, Homeowners, General Liability, Umbrella and Excess lines. The role that shaped him most was Senior Director of New Mobility Products, where he grew a book from under $50 million to over $450 million in gross written premium.

That kind of growth inside a large insurer also exposed the friction. Caligaris has described experiencing seven-year software implementation timelines for changes that should have taken months. For someone trained to optimize, the lag was intolerable, and it became the seed of a company.

What Ledgebrook actually sells

By 2022 he was ready. The pitch to brokers is speed and service. Wholesale brokers, who place hard-to-cover risks with specialty markets, live or die by response time, and legacy carriers are slow. "With our tech and culture we are able to provide a level of service they haven't seen before," Caligaris has said. Ledgebrook is fully remote and US-based, and it leans on a leadership team with a combined century-plus of insurance experience: John Mullen as President of E&S, Nathan Hall as CTO, Ruiqi Li as Chief Product & Data Officer, and others across claims, reinsurance and underwriting.

On artificial intelligence, Caligaris is notably restrained for a founder in 2026. He does not promise the technology will transform underwriting overnight. Instead he points to concrete, unglamorous tasks - classifying businesses by NAICS code, parsing dense underwriting guidelines - where automation directly lowers the expense ratio. "With great engineering and implementation there are direct use cases that hit the expense ratio," he has said. It is a practitioner's view of AI: measure the effect on the loss and expense numbers, and skip the rest.

A very long game

What separates Ledgebrook from a typical insurtech is the size of the ambition behind the restraint. Caligaris does not describe the company as a quick disruption play. He describes it as the foundation of something durable. "The long-term vision was to bring the best of technology to bear on building the digitally enabled, next generation version of a Berkshire Hathaway or Munich Re," he has said. Those are not startups. They are franchises measured in decades and balance-sheet strength, and naming them as the target says a lot about how he thinks.

He holds three of the toughest credentials in insurance and finance - FCAS, CFA and CPCU - which is unusual even among industry veterans, let alone founders. It reinforces the way he presents Ledgebrook: not as a technology company that stumbled into insurance, but as an insurance company that finally learned to build software. The distinction matters to brokers deciding whether to trust a newcomer with their placements, and it matters to investors underwriting a business that puts its own capital at risk alongside its carrier partners.

The market backdrop helps. E&S premium has been growing for years as more risk flows out of the standard market and into specialty channels. "The Excess and Surplus lines market is enormous. Over $100 billion in the US and growing," Caligaris has said, framing the incumbents' technology debt and cultural resistance as the opening he is exploiting. Ledgebrook's job is to be faster, more responsive and more capital-efficient than firms that have owned the space for generations.

None of it is guaranteed. Insurance is a business where growth can hide problems for years before losses catch up, and a young MGA scaling premium quickly has to prove its underwriting discipline through a full cycle. Caligaris knows the actuarial math better than most, which is part of the bet. He has spent his whole career pricing risk. Now he is pricing the risk of the company he built - and, so far, the brokers, the investors and the award judges are betting with him.