Guidewire buys AI underwriting startup hyperexponential for $1.7 billion

Guidewire said Tuesday, Oct. 27, 2026, it agreed to acquire London-based hyperexponential for $1.7 billion in cash, funded with a new $1 billion bank term loan and cash on hand.

Insurance is the least glamorous place for AI agents and maybe the most lucrative: underwriting is pricing risk on messy documents, which is exactly what language models are getting good at. Guidewire already runs the core policy and claims systems for a big chunk of P&C insurers; buying hx puts the pricing brain next to the plumbing. $1.7 billion in cash, a $1 billion loan to pay for it, and up to $400 million more if revenue shows up — that is a company betting its balance sheet that "agentic underwriting" becomes a line item, not a buzzword. The tell to watch is loss ratios, not demo videos.

Guidewire (NYSE: GWRE) said on Oct. 27, 2026, that it signed a definitive agreement to acquire Hyperexponential Ltd, shortened to hx, for a base purchase price of $1.7 billion in cash, subject to adjustments, plus up to $400 million in contingent consideration tied to specified recurring revenue targets. A definitive agreement is the signed deal. Contingent consideration is extra cash paid later only if those revenue targets are hit. Those terms are Guidewire's, from its press release.

hyperexponential is a London-based provider of AI-native underwriting and pricing software for commercial-lines property and casualty insurers, and it is already a Guidewire PartnerConnect technology partner. Property and casualty, shortened to P&C, is insurance for property and for claims of injury or damage. Guidewire says hx has powered underwriting decisions across more than $75 billion in annual commercial P&C premium. Those lines are Guidewire's.

Guidewire frames the deal as agentic underwriting: AI agents that work alongside underwriters and actuaries to assess risk, price it, and make decisions. An underwriter decides whether to cover a risk and at what price. An actuary does the math behind that price. An agent, here, is software that takes a step in that work. That framing is Guidewire's.

Guidewire expects to fund the purchase with $1.0 billion in new term loan financing and cash it already holds. A term loan is borrowed money paid back on a schedule. The release says Bank of America and Citibank gave a binding commitment for the loan. Guidewire's Form 8-K, filed the same day, says closing is not subject to a financing condition. The loan commitment is the release's. The financing-condition line is the 8-K's.

Guidewire expects the deal to close in its fiscal second quarter of 2027, the quarter ending Jan. 31, 2027. It expects the purchase to add at least 650 basis points to fiscal 2027 ARR growth on an inorganic basis, and, from fiscal 2028, at least 150 basis points to organic ARR growth. A basis point is one one-hundredth of a percentage point, so 650 basis points is 6.5 percentage points and 150 is 1.5. ARR is annual recurring revenue, the subscription money that comes back each year. Inorganic means the bump comes from buying a company. Organic is growth in the business after that. Guidewire says the deal does not change fiscal first-quarter 2027 guidance. Updated guidance comes on the December 2026 earnings call. Those figures are Guidewire's forecast.

Mike Rosenbaum, Guidewire's chief executive, said the company is "delighted to welcome Amrit Santhirasenan and the team at hyperexponential to Guidewire." Amrit Santhirasenan, hyperexponential's chief executive and co-founder, said they founded the company "on the conviction that underwriting judgment is the highest-leverage work insurers do." Those quotations are theirs, on Guidewire's release. Centerview Partners is Guidewire's exclusive financial advisor. Latham & Watkins is its legal counsel. Those names are the release's.

The picture is Guidewire's official portrait of chief executive Mike Rosenbaum, gray-haired and bearded, in a blue linen blazer and a checked shirt. The credit is Guidewire.

In plain terms, Guidewire agreed on Tuesday to buy the London underwriting-software company hyperexponential for $1.7 billion in cash, plus up to $400 million more if revenue targets are met. A $1 billion bank loan and cash on hand pay for it. The close is aimed at the quarter ending Jan. 31, 2027. Guidewire's own math is 6.5 extra percentage points of ARR growth in fiscal 2027 from the purchase, then 1.5 points of organic growth from fiscal 2028. Those points are a forecast.