[Form 3] TANDEM DIABETES CARE INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Tandem Diabetes Care, Inc. director Sandra Beaver filed an initial statement of beneficial ownership of securities. As of the event date of 11/07/2025, the filing reports beneficial ownership of 0 shares of common stock of Tandem Diabetes Care, Inc., held directly. The filing also shows no derivative securities, such as options or warrants, currently reported as beneficially owned.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Beaver Sandra

(Last) (First) (Middle)

12400 HIGH BLUFF DRIVE

(Street)

SAN DIEGO CA 92130

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
11/07/2025

3. Issuer Name and Ticker or Trading Symbol
TANDEM DIABETES CARE INC [ TNDM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	0	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Shannon M. Hansen, Attorney-in-Fact for Sandra Beaver	11/25/2025
	** Signature of Reporting Person	Date
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 5 (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.

FAQ

What did Tandem Diabetes Care (TNDM) disclose in this Form 3 filing?

The Form 3 reports that director Sandra Beaver beneficially owns 0 shares of Tandem Diabetes Care common stock as of 11/07/2025 and lists no derivative securities.

Who is the reporting person in this TNDM Form 3 filing?

The reporting person is Sandra Beaver, who is identified in the filing as a director of Tandem Diabetes Care, Inc.

How many Tandem Diabetes Care (TNDM) common shares does the director report owning?

The filing shows 0 shares of common stock of Tandem Diabetes Care, Inc. beneficially owned, with ownership reported as direct (D).

Are there any options or other derivative securities reported for TNDM in this Form 3?

No. The table for derivative securities contains no entries, indicating no derivative securities are reported as beneficially owned in this filing.

Is this Form 3 for one reporting person or a group for Tandem Diabetes Care (TNDM)?

The filing is indicated as Form filed by One Reporting Person, meaning it covers only the holdings of director Sandra Beaver.