WILLIS TOWERS WATSON PLC Segments Disclosure

Note 5 — Segment Information

WTW has two reportable operating segments organized by business areas:

WTW’s chief operating decision maker (‘CODM’) is its chief executive officer. We determined that the operational data used by the CODM is at the segment level. Management bases strategic goals and decisions for these segments on the data presented below which is used to assess the adequacy of strategic decisions and the methods of achieving these strategies and related financial results. Management evaluates the performance of its segments and allocates resources to them based on net segment operating income performance and prospects on a pre-tax basis.

Under the segment structure and for internal and segment reporting, WTW segment revenue includes commissions and fees, interest and other income. U.S. GAAP revenue also includes amounts that were directly incurred on behalf of our clients and reimbursed by them (reimbursable expenses), which are not included in segment revenue. There is no significant segment revenue derived from transactions between the segments.

In accordance with ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (‘ASC 2023-07’), the Company has not presented any individual significant expense categories due to the following factors:

Segment operating income excludes certain costs, including (i) amortization of intangibles; (ii) restructuring costs; (iii) certain transaction and transformation expenses; and (iv) to the extent that the actual expense based upon which allocations are made differs from the forecast/budget amount, a reconciling item will be created between internally-allocated expenses and the actual expenses that we report for U.S. GAAP purposes. Although not reviewed individually by the CODM, amounts included in segment expenses may be determined on both a direct and allocated basis and are related to salaries and benefits, depreciation, corporate overhead charges and other operating expenses, including for occupancy, colleague travel costs, legal, marketing, technology, professional fees and professional liability costs.

The Company does not currently provide asset information by reportable segment as it does not routinely evaluate the total asset position by segment.

None of the Company’s clients individually represented more than 10% of its consolidated revenue for the years ended December 31, 2025, 2024 and 2023.