144 0001701764 XXXXXXXX LIVE 0001053706 CRA INTERNATIONAL, INC. 000-24049 200 CLARENDON STREET BOSTON MA 02116 617-425-3000 Jonathan D. Yellin Officer Common Robert W. Baird

777 E. Wisconsin Avenue Milwaukee WI 53202

2250 389812.50 6227118 08/25/2026 Nasdaq Common 05/20/2025 RSU Vesting CRA International, Inc. N 156 05/20/2025 Compensation Common 03/03/2021 PRSU Vesting CRA International, Inc. N 50 03/03/2021 Compensation Common 12/18/2019 RSU Vesting CRA International, Inc. N 209 12/18/2019 Compensation Common 12/06/2019 RSU Vesting CRA International, Inc. N 250 12/06/2019 Compensation Common 12/18/2020 PRSU Vesting CRA International, Inc. N 327 12/18/2020 Compensation Common 12/18/2020 RSU Vesting CRA International, Inc. N 209 12/18/2020 Compensation Common 11/12/2019 RSU Vesting CRA International, Inc. N 345 11/12/2019 Compensation Common 11/12/2019 PRSU Vesting CRA International, Inc. N 501 11/12/2019 Compensation Common 03/12/2018 PRSU Vesting CRA International, Inc. N 203 03/12/2018 Compensation Y 08/25/2026 11/10/2025 Delia J. Makhlouta, by power of attorney