X0306 4 2021-11-05 0 0001786352 Bill.com Holdings, Inc. BILL 0001550715 Rettig John R. C/O BILL.COM HOLDINGS, INC. 6220 AMERICA CENTER DR., SUITE 100 SAN JOSE CA 95002 0 1 0 0 CFO Common Stock 2021-11-05 4 M 0 4000 5.26 A 83081 D Common Stock 2021-11-05 4 M 0 1500 8.76 A 84581 D Common Stock 2021-11-05 4 M 0 1000 69.37 A 85581 D Common Stock 2021-11-05 4 S 0 300 319.92 D 85281 D Common Stock 2021-11-05 4 S 0 100 320.93 D 85181 D Common Stock 2021-11-05 4 S 0 200 322.38 D 84981 D Common Stock 2021-11-05 4 S 0 700 325.47 D 84281 D Common Stock 2021-11-05 4 S 0 500 326.72 D 83781 D Common Stock 2021-11-05 4 S 0 267 328.0733 D 83514 D Common Stock 2021-11-05 4 S 0 200 329.24 D 83314 D Common Stock 2021-11-05 4 S 0 400 330.605 D 82914 D Common Stock 2021-11-05 4 S 0 400 331.6575 D 82514 D Common Stock 2021-11-05 4 S 0 500 332.864 D 82014 D Common Stock 2021-11-05 4 S 0 793 334.0963 D 81221 D Common Stock 2021-11-05 4 S 0 340 335.2794 D 80881 D Common Stock 2021-11-05 4 S 0 600 336.2333 D 80281 D Common Stock 2021-11-05 4 S 0 400 337.435 D 79881 D Common Stock 2021-11-05 4 S 0 700 338.30 D 79181 D Common Stock 2021-11-05 4 S 0 100 342.00 D 79081 D Common Stock 2021-11-09 5 G 0 E 19011 0.00 D 60070 D Common Stock 2021-11-09 5 G 0 E 19011 0.00 A 97700 I By Trust Common Stock 2021-11-09 5 G 0 E 3350 0.00 D 94350 I By Trust Employee Stock Option (Right to Buy) 5.26 2021-11-05 4 M 0 4000 0.00 D 2028-08-01 Common Stock 4000 52989 D Employee Stock Option (Right to Buy) 8.76 2021-11-05 4 M 0 1500 0.00 D 2029-02-12 Common Stock 1500 79500 D Employee Stock Option (Right to Buy) 69.37 2021-11-05 4 M 0 1000 0.00 D 2030-05-27 Common Stock 1000 28000 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $319.52 to $320.25 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $322.28 to $322.48 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $325.13 to $325.88 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $326.49 to $327.02 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $327.71 to $328.25 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.20 to $329.28 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $330.22 to $331.13 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $331.32 to $332.13 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $332.59 to $333.24 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $333.59 to $334.50 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $334.70 to $335.58 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $335.84 to $336.80 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $337.01 to $337.84 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $338.04 to $339.02 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Represents shares of the Issuer's common stock that the Reporting Person transferred as a gift to The Rettig Living Trust. The shares are held by the Rettig Living Trust U/A DTD 12/02/2020, of which the reporting holder and his spouse are co-trustees. Represents shares of the Issuer's common stock that the Reporting Person transferred as a gift to The Corporation of Gonzaga University. The option vests 1/48th of the total shares monthly beginning September 2, 2018 until such time as the option is 100% vested, subject to the continuing service of the Reporting Person on each vesting date. The option vests 50% on December 10, 2020 and thereafter 1/48 of the total shares vest monthly until such time as the option is 100% vested, subject to the continuing service of the Reporting Person on each vesting date. The option vests in 16 equal quarterly installments over four years, beginning August 28, 2020, subject to the continuing service of the Reporting Person on each vesting date. /s/ Rajesh Aji, Attorney-in-Fact 2021-11-09