Shannon M. Hansen - 17 Nov 2025 Form 4 Insider Report for TANDEM DIABETES CARE INC (TNDM)

Role: EVP & Chief Legal Officer
Signature: /s/ Shannon M. Hansen
Issuer symbol: TNDM
Transactions as of: 17 Nov 2025
Net transactions value: -$7,962
Form type: 4
Filing time: 19 Nov 2025, 16:06:23 UTC
Previous filing: 19 Aug 2025
Next filing: 19 Feb 2026
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/ Shannon M. Hansen	19 Nov 2025	0001908267

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TNDM	Common Stock	Award	$12,472	+800	+4.3%	$15.59	19,509	17 Nov 2025	Direct	F1
transaction	TNDM	Common Stock	Options Exercise	$0	+530	+2.7%	$0.000000	20,039	17 Nov 2025	Direct
transaction	TNDM	Common Stock	Tax liability	$3,536	-190	-0.95%	$18.61	19,849	17 Nov 2025	Direct	F2
transaction	TNDM	Common Stock	Options Exercise	$0	+1,437	+7.2%	$0.000000	21,286	17 Nov 2025	Direct
transaction	TNDM	Common Stock	Tax liability	$9,584	-515	-2.4%	$18.61	20,771	17 Nov 2025	Direct	F2
transaction	TNDM	Common Stock	Options Exercise	$0	+1,096	+5.3%	$0.000000	21,867	17 Nov 2025	Direct
transaction	TNDM	Common Stock	Tax liability	$7,314	-393	-1.8%	$18.61	21,474	17 Nov 2025	Direct	F2
holding	TNDM	Common Stock						1,935	17 Nov 2025	Shannon M. Hansen Trust	F3

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	-530	-50%	$0.000000	531	17 Nov 2025	Common Stock	530		Direct	F4, F5, F6
transaction	TNDM	Restricted Stock Unit	Options Exercise	$0	-1,437	-33%	$0.000000	2,874	17 Nov 2025	Common Stock	1,437		Direct	F7, F8, F9
transaction	TNDM	Restricted Stock Unit	Options Exercise	$0	-1,096	-14%	$0.000000	6,581	17 Nov 2025	Common Stock	1,096		Direct	F8, F10, F11

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

Explanation of Responses:

Id	Content
F1	The reporting person is voluntarily reporting the acquisition of shares of common stock pursuant to the Tandem Diabetes Care Inc. Amended and Restated 2013 Employee Stock Purchase Plan (ESPP), for the ESPP purchase period of May 16, 2025, through November 17, 2025. This transaction is also exempt under Rule 16b-3(c).
F2	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.
F3	The securities are held by the Shannon M. Hansen Trust dated July 8, 2003, of which Shannon M. Hansen is the Trustee.
F4	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).
F5	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.
F6	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.
F7	Awarded on May 25, 2023 pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan (the 2023 Plan).
F8	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.
F9	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.
F10	Awarded on May 23, 2024 pursuant to the 2023 Plan.
F11	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.