Rick Carpenter - 15 Dec 2025 Form 4 Insider Report for TANDEM DIABETES CARE INC (TNDM)

Role
Chief Technology Officer
Signature
/s/ Shannon M. Hansen, Attorney-in-Fact for Rick A. Carpenter
Issuer symbol
TNDM
Transactions as of
15 Dec 2025
Net transactions value
-$4,577
Form type
4
Filing time
17 Dec 2025, 16:01:39 UTC
Previous filing
19 Nov 2025
Next filing
19 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Carpenter Rick Chief Technology Officer 12400 HIGH BLUFF DRIVE, SAN DIEGO /s/ Shannon M. Hansen, Attorney-in-Fact for Rick A. Carpenter 17 Dec 2025 0001513889

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction TNDM Common Stock Options Exercise $0 +406 +1.7% $0.000000 24,459 15 Dec 2025 Direct
transaction TNDM Common Stock Tax liability $4,577 -207 -0.85% $22.11 24,252 15 Dec 2025 Direct 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 Restricted Stock Unit Options Exercise $0 -406 -100% $0.000000 0 15 Dec 2025 Common Stock 406 Direct F2, F3, F4
* 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 Awarded on December 15, 2021 pursuant to the Tandem Diabetes Care Inc. 2013 Stock Incentive Plan, as amended, and the agreements related thereto (the 2013 Plan).
F3 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.
F4 RSU vest as to twenty-five percent (25%) of the total number of shares subject to the RSU on 12/15/2022, and the remaining shares shall vest in twelve (12) equal quarterly installments thereafter.