X0508 4 2025-02-24 false 0001626450 BigCommerce Holdings, Inc. BIGC 0001386430 Siminoff Ellen F 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 2025-02-24 4 P false 3239.00 6.2825 A 56572.00 I By The D & E Living Trust Series 1 Common Stock 2025-02-25 4 P false 19603.00 6.4927 A 76175.00 I By The D & E Living Trust Series 1 Common Stock 77986.00 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.2057 to $6.30, inclusive. The reporting person undertakes to provide to BigCommerce Holdings, Inc., any security holder of BigCommerce Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price with the ranges set forth in Footnote 1 to this Form 4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.465 to $6.50, inclusive. The reporting person undertakes to provide to BigCommerce Holdings, Inc., any security holder of BigCommerce Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price with the ranges set forth in Footnote 2 to this Form 4. /s/ Chuck Cassidy, Attorney-in-Fact for Ellen Siminoff 2025-02-26