Form 4 Filing for CRA International, Inc.

This filing details transactions by Yellin Jonathan D, EVP AND GENERAL COUNSEL of CRA International, Inc. On April 9, 2026, 1396 Restricted Stock Units (RSUs) were acquired with a transaction value of $0. These RSUs represent a contingent right to receive shares of common stock, with vesting occurring in installments starting between April 9, 2026, and May 20, 2027, as detailed in footnotes F2 through F7. The filing also reports holdings of 14,702 shares of common stock. Additionally, two nonqualified stock options are reported, with exercise prices of $44.87 and $47.45, vesting in four equal annual installments starting from their respective grant dates in 2017 and 2018, and expiring in 2026 and 2027.