Shannon M. Hansen - 15 Aug 2025 Form 4 Insider Report for TANDEM DIABETES CARE INC (TNDM)

Role: EVP & Chief Legal Officer
Signature: /s/ Rachel Malina, Attorney-in-Fact for Shannon M. Hansen
Issuer symbol: TNDM
Transactions as of: 15 Aug 2025
Net transactions value: -$11,880
Form type: 4
Filing time: 19 Aug 2025, 18:14:15 UTC
Previous filing: 05 Jun 2025
Next filing: 19 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Hansen Shannon Marie	EVP & Chief Legal Officer	12400 HIGH BLUFF DRIVE, SAN DIEGO	/s/ Rachel Malina, Attorney-in-Fact for Shannon M. Hansen	19 Aug 2025	0001908267

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TNDM	Common Stock	Options Exercise	$0	+531	+3.2%	$0.000000	17,273	15 Aug 2025	Direct
transaction	TNDM	Common Stock	Tax liability	$2,056	-190	-1.1%	$10.82	17,083	15 Aug 2025	Direct	F1
transaction	TNDM	Common Stock	Options Exercise	$0	+1,437	+8.4%	$0.000000	18,520	15 Aug 2025	Direct
transaction	TNDM	Common Stock	Tax liability	$5,572	-515	-2.8%	$10.82	18,005	15 Aug 2025	Direct	F1
transaction	TNDM	Common Stock	Options Exercise	$0	+1,097	+6.1%	$0.000000	19,102	15 Aug 2025	Direct
transaction	TNDM	Common Stock	Tax liability	$4,252	-393	-2.1%	$10.82	18,709	15 Aug 2025	Direct	F1
holding	TNDM	Common Stock						1,935	15 Aug 2025	Shannon M. Hansen Trust	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	TNDM	Restricted Stock Unit	Options Exercise	$0	-531	-33%	$0.000000	1,061	15 Aug 2025	Common Stock	531		Direct	F3, F4, F5
transaction	TNDM	Restricted Stock Unit	Options Exercise	$0	-1,437	-25%	$0.000000	4,311	15 Aug 2025	Common Stock	1,437		Direct	F6, F7, F8
transaction	TNDM	Restricted Stock Unit	Options Exercise	$0	-1,097	-13%	$0.000000	7,677	15 Aug 2025	Common Stock	1,097		Direct	F7, F9, F10

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Shares withheld by Tandem Diabetes Care, Inc. (the Company) to satisfy tax withholding requirements on vesting of restricted stock units (RSU). No shares were sold.
F2	The securities are held by the Shannon M. Hansen Trust dated July 8, 2003, of which Shannon M. Hansen is the Trustee.
F3	Awarded on February 15, 2022 pursuant to the Tandem Diabetes Care, Inc. 2013 Stock Incentive Plan, as amended, and the agreements related thereto (the 2013 Plan).
F4	Each RSU represents a contingent right to receive either one share of common stock of the Issuer or cash in lieu thereof, at the Issuer's discretion, in accordance with the terms of the 2013 Plan.
F5	RSU vest as to twenty-five percent (25%) of the total number of shares subject to the RSU on 2/15/2023, and the remaining shares shall vest in twelve (12) equal quarterly installments thereafter.
F6	Awarded on May 25, 2023 pursuant to the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan).
F7	Each RSU represents a contingent right to receive either one share of common stock of the Issuer or cash in lieu thereof, at the Issuer's discretion, in accordance with the terms of the 2023 Plan.
F8	RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2024, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter.
F9	Awarded on May 23, 2024 pursuant to the 2023 Plan.
F10	RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2025, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter.