Elizabeth A. Gasser - 17 Feb 2026 Form 4 Insider Report for TANDEM DIABETES CARE INC (TNDM)

Role: EVP, Chief Strategy Officer
Signature: /s/ Shannon M. Hansen, Attorney-in-Fact for Elizabeth A. Gasser
Issuer symbol: TNDM
Transactions as of: 17 Feb 2026
Net transactions value: -$29,069
Form type: 4
Filing time: 19 Feb 2026, 16:37:38 UTC
Previous filing: 08 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gasser Elizabeth Anne	EVP, Chief Strategy Officer	12400 HIGH BLUFF DRIVE, SAN DIEGO	/s/ Shannon M. Hansen, Attorney-in-Fact for Elizabeth A. Gasser	19 Feb 2026	0001866283

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TNDM	Common Stock	Options Exercise	$0	+1,503		$0.000000	1,503	17 Feb 2026	Direct
transaction	TNDM	Common Stock	Tax liability	$16,809	-887	-59%	$18.95	616	17 Feb 2026	Direct	F1
transaction	TNDM	Common Stock	Options Exercise	$0	+1,097	+178%	$0.000000	1,713	17 Feb 2026	Direct
transaction	TNDM	Common Stock	Tax liability	$12,261	-647	-38%	$18.95	1,066	17 Feb 2026	Direct	F1
holding	TNDM	Common Stock						25,949	17 Feb 2026	See Footnote	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	-1,503	-50%	$0.000000	1,503	17 Feb 2026	Common Stock	1,503		Direct	F3, F4, F5
transaction	TNDM	Restricted Stock Unit	Options Exercise	$0	-1,097	-17%	$0.000000	5,484	17 Feb 2026	Common Stock	1,097		Direct	F4, F6, F7

* 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 Gasser Family Trust dated September 1, 2011, of which Elizabeth A. Gasser is a co-trustee.
F3	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).
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 2023 Plan.
F5	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.
F6	Awarded on May 23, 2024 pursuant to the 2023 Plan.
F7	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.