X0306 4 2021-06-14 0 0001348036 AVALARA, INC. AVLR 0001770686 Mathradas Amit 255 SOUTH KING ST. SUITE 1800 SEATTLE WA 98104 0 1 0 0 See Remarks Common Stock 2021-06-14 4 M 0 785 55.10 A 102752 D Common Stock 2021-06-14 4 M 0 289 67.27 A 103041 D Common Stock 2021-06-14 4 S 0 906 137.93 D 102135 D Common Stock 2021-06-14 4 S 0 1199 139.29 D 100936 D Common Stock 2021-06-14 4 S 0 2324 139.96 D 98612 D Stock Option (right to buy) 55.10 2021-06-14 4 M 0 785 0.00 D 2029-04-22 Common Stock 785 58248 D Stock Option (right to buy) 67.27 2021-06-14 4 M 0 289 0.00 D 2030-03-12 Common Stock 289 23371 D The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 11, 2020, and amended on May 14, 2021. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $137.65 to $138.56, inclusive. Upon request by the Issuer, any security holder thereof, or the staff of the Securities and Exchange Commission, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) through (4) to this Form 4. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $138.83 to $139.818, inclusive. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.83 to $140.119, inclusive. 25% of the total shares subject to the option vested and became exercisable on March 4, 2020, and 1/48th of the total shares subject to the option vest and become exercisable monthly thereafter such that the option is fully vested and exercisable on March 4, 2023. 25% of the total shares subject to the option vested and became exercisable on March 5, 2021, and 1/48th of the total shares subject to the option vest and become exercisable monthly thereafter such that the option is fully vested and exercisable on March 5, 2024. President and Chief Operating Officer /s/ Miles Treakle, Attorney-in-Fact 2021-06-15