# EDGAR Filing Document

**Accession Number:** 0001908267
**File Stem:** 0001628280-25-040841
**Filing Date:** 2025-8
**Character Count:** 8226
**Document Hash:** 14fc4ae385cf6ca5b11cf041889e9477
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-25-040841.hdr.sgml**: 20250819

**ACCESSION NUMBER**: 0001628280-25-040841

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250815

**FILED AS OF DATE**: 20250819

**DATE AS OF CHANGE**: 20250819

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Hansen Shannon Marie
- **CENTRAL INDEX KEY:** 0001908267

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36189
- **FILM NUMBER:** 251233331

**MAIL ADDRESS:**
- **STREET 1:** C/O TANDEM DIABETES CARE, INC.
- **STREET 2:** 11075 ROSELLE STREET
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92121
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TANDEM DIABETES CARE INC
- **CENTRAL INDEX KEY:** 0001438133
- **STANDARD INDUSTRIAL CLASSIFICATION:** SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 204327508
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 12400 HIGH BLUFF DRIVE
- **CITY:** San Diego
- **STATE:** CA
- **ZIP:** 92130
- **BUSINESS PHONE:** 858-366-6900

**MAIL ADDRESS:**
- **STREET 1:** 12400 HIGH BLUFF DRIVE
- **CITY:** San Diego
- **STATE:** CA
- **ZIP:** 92130

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Hansen Shannon Marie<br><sub>(Last) (First) (Middle)</sub><br>12400 HIGH BLUFF DRIVE<br><sub>(Street)</sub><br>SAN DIEGO, CA 92130<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-08-15 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_EVP & Chief Legal Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>TANDEM DIABETES CARE INC [ TNDM ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-08-15 |  | M |  | 531 | A | $0 | 17273 | D |  |
| Common Stock | 2025-08-15 |  | F |  | 190<sup>(1)</sup> | D | $10.82 | 17083 | D |  |
| Common Stock | 2025-08-15 |  | M |  | 1437 | A | $0 | 18520 | D |  |
| Common Stock | 2025-08-15 |  | F |  | 515<sup>(1)</sup> | D | $10.82 | 18005 | D |  |
| Common Stock | 2025-08-15 |  | M |  | 1097 | A | $0 | 19102 | D |  |
| Common Stock | 2025-08-15 |  | F |  | 393<sup>(1)</sup> | D | $10.82 | 18709 | D |  |
| Common Stock |  |  |  |  |  |  |  | 1935 | I | Shannon M. Hansen Trust<sup>(2)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Unit<sup>(3)</sup> | <sup>(4)</sup> | 2025-08-15 |  | M |  |  | 531 | <sup>(5)</sup> | <sup>(5)</sup> | Common Stock | 531 | $0 | 1061 | D |  |
| Restricted Stock Unit<sup>(6)</sup> | <sup>(7)</sup> | 2025-08-15 |  | M |  |  | 1437 | <sup>(8)</sup> | <sup>(8)</sup> | Common Stock | 1437 | $0 | 4311 | D |  |
| Restricted Stock Unit<sup>(9)</sup> | <sup>(7)</sup> | 2025-08-15 |  | M |  |  | 1097 | <sup>(10)</sup> | <sup>(10)</sup> | Common Stock | 1097 | $0 | 7677 | D |  |

---

### Footnotes:

(1) 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.

(2) The securities are held by the Shannon M. Hansen Trust dated July 8, 2003, of which Shannon M. Hansen is the Trustee.

(3) 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).

(4) 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.

(5) 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.

(6) 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).

(7) 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.

(8) 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.

(9) Awarded on May 23, 2024 pursuant to the 2023 Plan.

(10) 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.

**Signature:** /s/ Rachel Malina, Attorney-in-Fact for Shannon M. Hansen  
**Date:** 2025-08-19

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**