Tandem Diabetes director granted 10,220 RSUs

Tandem Diabetes Care director Joao Paulo Falcao Malagueira increased his equity stake through stock-based compensation.

Rhea-AI Filing Summary

Tandem Diabetes Care director Joao Paulo Falcao Malagueira increased his equity stake through stock-based compensation. On May 21, 2026, 8,759 restricted stock units granted on May 21, 2025 vested and converted into 8,759 shares of common stock. Following this vesting, he directly holds 22,458 common shares.

Separately, on May 20, 2026 he received a new grant of 10,220 restricted stock units under the company’s 2023 Long-Term Incentive Plan. These RSUs each represent a contingent right to receive one share of common stock or cash, and will vest on the one-year anniversary of the grant date.

Insider Trade Summary

8,759 shares exercised/converted

Exercise 3 txns

Insider Malagueira Joao Paulo Falcao

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	8,759	$0.00	$0.00
Exercise	Common Stock	8,759	$0.00	$0.00
Grant/Award	Restricted Stock Unit	10,220	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 10,220 contracts (Direct); Common Stock — 22,458 shares (Direct)

Footnotes (3)

1. F1. Each restricted stock units (RSU) represents a contingent right to receive either one share of the Issuers common stock or cash in lieu thereof, at the Issuers discretion, in accordance with the terms of the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan).
2. F2. Such RSUs were granted to the Reporting Person on May 20, 2026, and will vest on the one-year anniversary thereof, subject to the terms of the 2023 Plan.
3. F3. On May 21, 2025, the Reporting Person was granted 8,759 RSUs, all of which vested and converted into shares of the Issuers common stock on the one-year anniversary thereof in accordance with the 2023 Plan.

Key Figures

Shares acquired via RSU vesting: 8,759 shares Common shares held after transaction: 22,458 shares New RSU grant: 10,220 restricted stock units +2 more

5 metrics

Shares acquired via RSU vesting 8,759 shares Common stock from RSUs vested on May 21, 2026

Common shares held after transaction 22,458 shares Direct ownership following RSU conversion

New RSU grant 10,220 restricted stock units Granted on May 20, 2026 under 2023 Long-Term Incentive Plan

RSU grant date (vested award) May 21, 2025 8,759 RSUs granted, later vested into common stock

Exercise/vesting transactions 1 exercise event Exercise or conversion of derivative security (RSUs) on May 21, 2026

Key Terms

Restricted Stock Unit, contingent right, Long-Term Incentive Plan, derivative security

4 terms

Restricted Stock Unit financial

"On May 21, 2026, 8,759 restricted stock units granted on May 21, 2025 vested and converted"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

contingent right financial

"Each restricted stock units (RSU) represents a contingent right to receive either one share"

Long-Term Incentive Plan financial

"in accordance with the terms of the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan"

A long-term incentive plan is a company program that pays executives or employees with stock, options, or cash tied to multi-year performance goals, where the rewards become theirs only after meeting conditions over time. Think of it as a delayed bonus or retirement-style reward that aligns employees’ interests with shareholders by encouraging them to boost long-term value; investors watch these plans because they affect pay costs, share dilution and management incentives.

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/22/2026 - 04:11 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Malagueira Joao Paulo Falcao

(Last) (First) (Middle)

12400 HIGH BLUFF DRIVE

(Street)

SAN DIEGO CALIFORNIA 92130

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/21/2026		M		8,759	A	$0	22,458	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(1)	05/20/2026		A		10,220		(2)	(2)	Common Stock	10,220	$0	10,220	D
Restricted Stock Unit	(1)	05/21/2026		M			8,759	(3)	(3)	Common Stock	8,759	$0	0	D

Explanation of Responses:

1. Each restricted stock units (RSU) represents a contingent right to receive either one share of the Issuers common stock or cash in lieu thereof, at the Issuers discretion, in accordance with the terms of the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan).

2. Such RSUs were granted to the Reporting Person on May 20, 2026, and will vest on the one-year anniversary thereof, subject to the terms of the 2023 Plan.

3. On May 21, 2025, the Reporting Person was granted 8,759 RSUs, all of which vested and converted into shares of the Issuers common stock on the one-year anniversary thereof in accordance with the 2023 Plan.

Remarks:

Ex. 24: Power of Attorney

	/s/ Jerilyn Laskie, Attorney-in-Fact for Joao Paulo Falcao Malagueira	05/22/2026
	** 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 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.
* Form 4: SEC 1474 (03-26)