Key facts
- This page summarizes Susan Morrison's Form 4 filing for TANDEM DIABETES CARE INC (TNDM).
- 10 reported transactions and 3 derivative rows are listed below.
- Accepted by SEC: 19 May 2026, 16:08.
Susan Morrison - 15 May 2026 Form 4 Insider Report for TANDEM DIABETES CARE INC (TNDM)
- Reporting relationship
- EVP & Chief Admin. Officer
- Issuer ticker
- TNDM
- Reported as of
- 15 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 19 May 2026, 16:08:13 UTC
- Prior SEC filing
- 19 Feb 2026
- Next SEC filing
- 02 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Shannon M. Hansen, Attorney-in-Fact for Susan M. Morrison
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Susan Morrison filed Form 4 for TANDEM DIABETES CARE INC (TNDM) on 19 May 2026.
Change
- Previous filing in this sequence was filed on 19 Feb 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001582970
Primary reporting owner
Morrison Susan
- Relationship
- EVP & Chief Admin. Officer
- Address
- 12400 HIGH BLUFF DRIVE, SAN DIEGO
- Signature
- /s/ Shannon M. Hansen, Attorney-in-Fact for Susan M. Morrison
- Signature date
- 19 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
TNDM
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +1,503
- Change %
- +3.5%
- Price
- $0.000000*
- Shares after
- 44,138
- Date
- 15 May 2026
- Ownership
- Direct
TNDM
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -430
- Change %
- -0.97%
- Price
- $12.82*
- Shares after
- 43,708
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F1
TNDM
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +1,097
- Change %
- +2.5%
- Price
- $0.000000*
- Shares after
- 44,805
- Date
- 15 May 2026
- Ownership
- Direct
TNDM
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -314
- Change %
- -0.7%
- Price
- $12.82*
- Shares after
- 44,491
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F1
TNDM
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +6,923
- Change %
- +16%
- Price
- $0.000000*
- Shares after
- 51,414
- Date
- 15 May 2026
- Ownership
- Direct
TNDM
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -1,980
- Change %
- -3.9%
- Price
- $12.82*
- Shares after
- 49,434
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F1
TNDM
transaction
Common Stock
Award
- Transaction value
- Shares
- +1,336
- Change %
- +2.7%
- Price
- $10.90*
- Shares after
- 50,770
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F2
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
TNDM
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- Shares
- -1,503
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 15 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 1,503
- Exercise price
- Footnotes
- F3, F4, F5
TNDM
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- Shares
- -1,097
- Change %
- -20%
- Price
- $0.000000*
- Shares after
- 4,387
- Date
- 15 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 1,097
- Exercise price
- Footnotes
- F4, F6, F7
TNDM
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- Shares
- -6,923
- Change %
- -33%
- Price
- $0.000000*
- Shares after
- 13,845
- Date
- 15 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 6,923
- Exercise price
- Footnotes
- F4, F8, F9
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 9 footnotes
Footnote 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.
Footnote F2
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 November 18, 2025, through May 15, 2026. This transaction is also exempt under Rule 16b-3(c).
Footnote 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).
Footnote 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.
Footnote 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.
Footnote F6
Awarded on May 23, 2024 pursuant to the 2023 Plan.
Footnote 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.
Footnote F8
Awarded on May 30, 2025 pursuant to the 2023 Plan.
Footnote F9
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.