X0306 4 2021-03-05 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 2021-03-05 4 M 0 785 55.10 A 110590 D Common Stock 2021-03-05 4 M 0 3463 67.27 A 114053 D Common Stock 2021-03-05 4 S 0 797 137.23 D 113256 D Common Stock 2021-03-05 4 S 0 1110 138.30 D 112146 D Common Stock 2021-03-05 4 S 0 1019 139.58 D 111127 D Common Stock 2021-03-05 4 S 0 140 140.95 D 110987 D Common Stock 2021-03-05 4 S 0 790 141.76 D 110197 D Common Stock 2021-03-05 4 S 0 200 142.85 D 109997 D Common Stock 2021-03-05 4 S 0 192 144.02 D 109805 D Stock Option (right to buy) 55.10 2021-03-05 4 M 0 785 0.00 D 2029-04-22 Common Stock 785 60603 D Stock Option (right to buy) 67.27 2021-03-05 4 M 0 3463 0.00 D 2030-03-12 Common Stock 3463 24238 D The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 11, 2020. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $136.71 to $137.70, 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 (6) to this Form 4. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $137.74 to $138.67, inclusive. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.25 to $140.06, inclusive. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $140.36 to $141.18, inclusive. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $141.40 to $142.33, 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 2021-03-09