CRA INTERNATIONAL, INC.

Securities Trading Plans of Directors and Executive Officers

During the fiscal quarter ended April 4, 2026, no director or officer of the Company adopted orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” (in each case, as defined in Item 408 of Regulation S-K).

Credit Agreement Amendment

On May 4, 2026, the Company and its subsidiaries CRA International (UK) Limited (the “UK Borrower”) and CRA International Limited (the “Canadian Borrower”, and, together with the UK Borrower, the “Designated Borrowers”; the Designated Borrowers, together with the Company, the “Borrowers”) entered into an amendment (the “Incremental Amendment”) to the Credit Agreement, dated as of August 19, 2022 (as amended by the Incremental Amendment and any prior amendments or other modifications prior thereto, the “Credit Agreement”), among the Borrowers, certain lenders, certain letter of credit issuers, and Bank of America, N.A., as administrative agent.

Pursuant to the Incremental Amendment, the aggregate principal amount of the revolving credit facility commitments extended to the Borrowers under the Credit Agreement was increased from $250 million to $300 million (subject to the existing sublimits with respect to the maximum amount of the revolving credit loans to be made to the Designated Borrowers and certain other matters).

The Company may use the proceeds of the revolving credit loans to provide working capital and for other general corporate purposes, subject to compliance with the terms of the Credit Agreement. The Company may repay any borrowings under the revolving credit facility at any time (without any premium or penalty), but must repay all borrowings thereunder in no event later than August 19, 2027.

The foregoing description of the Incremental Amendment is qualified in its entirety by reference to the full text of the Incremental Amendment, a copy of which is filed as Exhibit 10.2 to this Quarterly Report on Form 10-Q.