STOCK TITAN

Tandem Diabetes (TNDM) director reports 10,220 RSU grant and 8,759-share vesting

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Tandem Diabetes Care director Peyton R. Howell reported equity award activity. On May 21, 2026, 8,759 previously granted restricted stock units vested and were exercised into the same number of common shares, increasing direct holdings to 29,836 shares. On May 20, 2026, Howell also received a new grant of 10,220 restricted stock units under the company’s 2023 Long-Term Incentive Plan, which will vest on the one-year anniversary of the grant date.

Positive

  • None.

Negative

  • None.
Insider Howell Peyton R
Role null
Type Security Shares Price Value
Exercise Restricted Stock Unit 8,759 $0.00 --
Exercise Common Stock 8,759 $0.00 --
Grant/Award Restricted Stock Unit 10,220 $0.00 --
Holdings After Transaction: Restricted Stock Unit — 0 shares (Direct, null); Common Stock — 29,836 shares (Direct, null)
Footnotes (1)
  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). 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. 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.
RSUs vested and converted 8,759 shares Restricted stock units converting into common stock on May 21, 2026
RSU grant size 10,220 units New restricted stock unit grant on May 20, 2026
Shares held after transaction 29,836 shares Direct common stock holdings following transactions
RSU conversion price $0.00 per unit Exercise/conversion price for vested restricted stock units
Total acquire-type transactions 3 transactions Form 4 summary of acquire-direction events
Restricted Stock Unit financial
"Each restricted stock units (RSU) represents a contingent right to receive either one share..."
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.
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.
grant, award, or other acquisition financial
"transaction_code_description: Grant, award, or other acquisition"
SEC Form 4
FORM 4UNITED 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*
Howell Peyton R

(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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/21/2026M8,759A$029,836D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Unit(1)05/20/2026A10,220 (2) (2)Common Stock10,220$010,220D
Restricted Stock Unit(1)05/21/2026M8,759 (3) (3)Common Stock8,759$00D
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 Peyton R. Howell05/22/2026
** Signature of Reporting PersonDate
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)

FAQ

What insider transactions did Tandem Diabetes Care (TNDM) report for Peyton R. Howell?

Peyton R. Howell reported equity award-related acquisitions. 8,759 restricted stock units vested and converted into common stock on May 21, 2026, and 10,220 new restricted stock units were granted on May 20, 2026, under Tandem Diabetes Care’s 2023 Long-Term Incentive Plan.

How many Tandem Diabetes Care (TNDM) shares does Peyton R. Howell hold after these Form 4 transactions?

After the reported transactions, Howell directly holds 29,836 common shares. This reflects the conversion of 8,759 restricted stock units into common stock, as disclosed, in addition to shares already held before these equity award events.

What restricted stock unit grant did Tandem Diabetes Care (TNDM) give Peyton R. Howell?

Howell received a grant of 10,220 restricted stock units on May 20, 2026. Each unit represents a contingent right to one share of common stock or cash, at the company’s discretion, under the 2023 Long-Term Incentive Plan.

When will Peyton R. Howell’s new Tandem Diabetes Care (TNDM) RSUs vest?

The 10,220 restricted stock units granted to Howell will vest one year after May 20, 2026. Vesting is subject to the terms of Tandem Diabetes Care’s 2023 Long-Term Incentive Plan and the related award agreements.

What happened to the 8,759 Tandem Diabetes Care (TNDM) RSUs previously granted to Peyton R. Howell?

The 8,759 restricted stock units previously granted to Howell fully vested and converted into common stock. According to the disclosure, this vesting and conversion occurred on the one-year anniversary of the original grant, consistent with the 2023 Long-Term Incentive Plan.