EXPONENT INC

Report of Independent Regis tered Public Accounting Firm

To the Stockholders and Board of Directors

Exponent, Inc.:

Opinions on the Consolidated Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Exponent, Inc. and subsidiaries (the Company) as of January 2, 2026 and January 3, 2025, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended January 2, 2026, and the related notes and financial statement schedule II (collectively, the consolidated financial statements). We also have audited the Company’s internal control over financial reporting as of January 2, 2026, based on criteria established in Internal Control – Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of January 2, 2026 and January 3, 2025, and the results of its operations and its cash flows for each of the years in the three-year period ended January 2, 2026, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of January 2, 2026 based on criteria established in Internal Control – Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s consolidated financial statements and an opinion on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we 2 considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Collectability of accounts receivables

As discussed in Notes 1 and 6 to the consolidated financial statements, the Company’s allowance for contract losses and doubtful accounts was $7.5 million as of January 2, 2026. The Company’s accounts receivables, net was $181.5 million as of January 2, 2026, which represents 23% of total assets and 31% of revenue for the year ended January 2, 2026. As discussed in Note 1, the Company maintains allowances to estimate their ability to collect financial obligations from customers. The Company records a specific allowance in circumstances where the Company is aware of a specific customer’s inability to meet its financial obligations.

We identified the assessment of the collectability of accounts receivable as a critical audit matter. Specifically, the specific allowance is an estimate which involves assessing the likelihood of collection of customer’s accounts receivable by considering various factors such as communication from the customer, historical collections, and number of days accounts receivables have been outstanding. Subjective auditor judgment was involved in evaluating the relevance and reliability of the evidence obtained in evaluating these factors.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls related to the critical audit matter. This included controls related to the Company’s assessment of the specific allowance. We investigated significant fluctuations in the specific allowance as compared to gross accounts receivable and the prior year specific allowance. For a selection of customer invoices and projects, we inquired of 3 Company personnel to evaluate the rationale for establishing a specific allowance for certain customers and assessed the Company’s estimate of the specific customer allowance by evaluating the underlying contractual documents, historical collection trends, communications with customers, number of days account receivable have been outstanding, and other additional factors. We also evaluated subsequent collections occurring after the balance sheet date for selected customer invoices and projects and considered the impact of potential subsequent events on the estimate of the specific customer allowance.

/s/ KPMG LLP

We have served as the Company’s auditor since 1987.

San Francisco, California

February 27, 2026