X0508 4 2025-06-05 false 0001626450 BigCommerce Holdings, Inc. BIGC 0001297831 Clarke Donald E C/O BIGCOMMERCE HOLDINGS, INC. 11305 FOUR POINTS DR, BLDG II, SUITE 100 AUSTIN TX 78726 true false false false false Series 1 Common Stock 2025-06-05 4 A false 34337.00 0.00 A 120532.00 D Series 1 Common Stock 2025-06-05 4 A false 2959.00 0.00 A 123491.00 D Series 1 Common Stock 68090.00 I By Donald E Clarke Irrevocable Trust Series 1 Common Stock 15564.00 I By Ellen C. Whittet Irrevocable Trust Series 1 Common Stock 15564.00 I By John A. Clarke Irrevocable Trust Series 1 Common Stock 15564.00 I By Leanne C. Allan Irrevocable Trust Series 1 Common Stock 15564.00 I By Robin K. Clarke Irrevocable Trust Series 1 Common Stock 15564.00 I By Thomas J. Clarke Irrevocable Trust /s/ Chuck Cassidy, Attorney-in-Fact for Clarke, Donald E. 2025-06-09