Elizabeth A. Gasser - May 30, 2025 Form 4 Insider Report for TANDEM DIABETES CARE INC (TNDM)

Role: EVP, Chief Strategy Officer
Signature: /s/ Rachel Malina, Attorney-in-Fact for Elizabeth A. Gasser
Stock symbol: TNDM
Transactions as of: May 30, 2025
Transactions value $: $0
Form type: 4
Date filed: 6/5/2025, 05:22 PM
Previous filing: Jun 2, 2025
Next filing: Aug 19, 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/ Rachel Malina, Attorney-in-Fact for Elizabeth A. Gasser	2025-06-05	0001866283

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	TNDM	Common Stock						22.9K	May 30, 2025	See Footnote	F1

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	Performance Stock Unit	Award	$0	+23K		$0.00	23K	May 30, 2025	Common Stock	23K		Direct	F2, F3
transaction	TNDM	Restricted Stock Unit	Award	$0	+23K		$0.00	23K	May 30, 2025	Common Stock	23K		Direct	F2, F4, F5

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

Explanation of Responses:

Id	Content
F1	The securities are held by The Gasser Family Trust dated September 1, 2011, of which Elizabeth A. Gasser is a co-trustee.
F2	Awarded on May 30, 2025 pursuant to the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan).
F3	Each performance stock unit (PSU) represents a contingent right to receive one share of Tandem Diabetes Care, Inc. (the Company) common stock based upon the achievement of certain pre-defined performance metrics as of December 31, 2027 (the Measurement Date). The number of shares issued may range from 0% to 200% of the amount specified above, based upon (i) Company's actual performance relative to the pre-defined performance metrics, and (ii) subject to the awardee's continuing service through the Measurement Date. If minimum performance metrics are not met, no PSUs will vest.
F4	Each restricted stock unit (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 5/15/2026, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter.