X0306 4 2021-08-26 false 0001626450 BigCommerce Holdings, Inc. BIGC 0001386430 Siminoff Ellen F C/O BIGCOMMERCE HOLDINGS, INC. 11305 FOUR POINTS DR, BLDG II, 3RD FLOOR AUSTIN TX 78726 true false false false Series 1 Common Stock 2021-08-26 4 S false 2094.00 57.5042 D 58739.00 I By The D & E Living Trust Series 1 Common Stock 2021-08-26 4 S false 406.00 58.2607 D 58333.00 I By The D & E Living Trust Series 1 Common Stock 1306.00 D This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 30, 2020. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $56.97 to $57.9699, 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 sold at each separate price with the ranges set forth in Footnote 2 to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $57.98 to $58.9799, 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 sold at each separate price with the ranges set forth in Footnote 3 to this Form 4. /s /Jeff Mengoli, Attorney-in-Fact for Ellen Siminoff 2021-08-30