X0306 4 2020-09-15 0 0001438133 TANDEM DIABETES CARE INC TNDM 0001365369 Sheridan John F C/O TANDEM DIABETES CARE, INC. 11075 ROSELLE STREET SAN DIEGO CA 92121 0 1 0 0 PRESIDENT & CEO Common Stock 2020-09-15 4 M 0 9599 18.86 A 13355 D Common Stock 2020-09-15 4 S 0 9599 110.0033 D 3756 D Common Stock 2020-09-16 4 M 0 401 18.86 A 4157 D Common Stock 2020-09-16 4 S 0 401 110.37 D 3756 D Stock Option 18.86 2020-09-15 4 M 0 9599 0 D Common Stock 9599.0 90401 D Stock Option 18.86 2020-09-16 4 M 0 401 0 D Common Stock 401.0 90000 D Represents shares of common stock received upon exercise of a stock option award. The shares were sold, pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 3, 2020. The price reported reflects the weighted average price per share of multiple transactions with prices per share ranging between $110.00 to $110.04. The Reporting Person undertakes to provide the Securities and Exchange Commission (the "SEC"), the issuer, and any security holder full information regarding the number of shares and the prices at which the shares were sold. The option vested as to fifty percent (50%) of the underlying shares on 06/14/2019, and the remaining shares vested in twelve (12) equal monthly installments thereafter. The expiration date for these options is 10 years from the date of grant. s/ David B. Berger , Attorney-in-Fact for John F. Sheridan 2020-09-17