SCHEDULE 13G/A 0001085146-20-000195 0001163744 XXXXXXXX LIVE 3 Common Stock 12/31/2025 0000851520 EXPONENT INC 30214U102 EXPONENT INC 149 COMMONWEALTH DRIVE MENLO PARK CA 94025 Rule 13d-1(b) Conestoga Capital Advisors DE 2392498 0 2392498 0 2526244 N 5.06 IA EXPONENT INC EXPONENT INC, 149 COMMONWEALTH DRIVE, MENLO PARK, CALIFORNIA 94025 Conestoga Capital Advisors 550 E. SWEDESFORD ROAD SUITE 120 WAYNE, Pennsylvania 19087 Conestoga Capital Advisors - DELAWARE N IA 2,526,244 5.06 Conestoga Capital Advisors - 2,392,498 Conestoga Capital Advisors - 0 Conestoga Capital Advisors - 2,392,498 Conestoga Capital Advisors - 0 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Conestoga Capital Advisors Duane R. D'Orazio 01/09/2026