144 0001238913 XXXXXXXX LIVE 0001438133 TANDEM DIABETES CARE INC 001-36189 12400 HIGH BLUFF DRIVE San Diego CA 92130 858-366-6900 BLICKENSTAFF KIM D Board of Directors, Chair Emeritus common Cowen Execution Servioces, LLC

1633 Broadway 48th Floor New York NY 10019

30000 900000.00 159577 11/21/2024 NASDAQ Common 08/18/2020 Purchase Tandem Diabetes Care Inc N 7020 08/18/2020 cash Common 05/17/2022 Purchase Tandem Diabetes Care, Inc N 2800 05/17/2022 cash Common 11/10/2020 Purchase Tandem Diabetes Care Inc N 6048 11/10/2020 cash Common 08/11/2020 Purchase Tandem Diabetes Care, Inc N 14132 08/11/2020 cash N Kim Blickenstaff

12400 High Bluff Drive San Diego CA 92130-3077

common 11/20/2024 10000 300000.00 11/21/2024 /S/ Kim D Blickenstaff