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Tandem Diabetes (TNDM) Form 4: 1,749-share RSU conversion by director

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

Rhea-AI Filing Summary

SEC Form 4 filed on 06/18/2025 reveals that Tandem Diabetes Care, Inc. (TNDM) director Myoungil Cha acquired 1,749 shares of common stock on 06/16/2025 through the vesting and settlement of previously granted restricted stock units (RSUs) under the company’s 2013 Stock Incentive Plan. The conversion, reported with transaction code “M,” was executed at $0 cost to the insider and involved no open-market purchase or sale.

Following the transaction, Cha’s direct beneficial ownership rose from 11,950 to 13,699 shares. The RSU grant was originally awarded on 06/15/2022 and vests in three equal annual installments; the reported shares represent the second installment, with additional tranches scheduled for future anniversaries, subject to plan terms.

Key takeaways:

  • Insider ownership increase: +1,749 shares, signalling continued alignment with shareholder interests.
  • Routine equity compensation: Transaction stems from standard RSU vesting, not discretionary market activity.
  • No cash proceeds or sales: Neutral impact on near-term share flow and insider liquidity.

Positive

  • Insider ownership increased by 1,749 shares, suggesting continued equity alignment with shareholders.

Negative

  • None.

Insights

TL;DR – Routine RSU vesting adds 1,749 shares to director’s holdings; market impact minimal.

The filing shows an automatic conversion of RSUs, increasing Cha’s stake to 13,699 shares. Because no shares were sold and the exercise price was $0, the transaction is non-dilutive beyond the ordinary course of equity compensation. Such activity is typical for directors and is unlikely to alter near-term supply-demand dynamics or valuation multiples. Investors may view the retention of shares as a mild positive signal, but the size—well below 1% of float—keeps overall impact neutral.

TL;DR – Standard plan-based vesting; supports alignment but not materially significant.

This Form 4 reflects compliance with Tandem Diabetes Care’s 2013 Stock Incentive Plan. The director did not elect a 10b5-1 sale program and retained the newly issued shares, which can be interpreted as confidence in the firm. However, without additional buying or sizeable ownership changes, governance implications remain neutral. No red flags regarding timing or disclosure are evident.

Insider Cha Myoungil
Role Director
Type Security Shares Price Value
Exercise Restricted Stock Unit 1,749 $0.00 --
Exercise Common Stock 1,749 $0.00 --
Holdings After Transaction: Restricted Stock Unit — 0 shares (Direct); Common Stock — 13,699 shares (Direct)
Footnotes (1)
  1. Awarded on June 15, 2022 pursuant to the Tandem Diabetes Care, Inc. 2013 Stock Incentive Plan, as amended, and the agreements related thereto (the 2013 Plan). Each restricted stock unit (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. The total number of shares subject to the RSU will vest over a period of three years in equal annual installments on the anniversary of the grant, subject to the terms of the 2013 Plan.
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*
Cha Myoungil

(Last) (First) (Middle)
12400 HIGH BLUFF DRIVE

(Street)
SAN DIEGO CA 92130

(City) (State) (Zip)
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)
3. Date of Earliest Transaction (Month/Day/Year)
06/16/2025
4. 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 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 06/16/2025 M 1,749 A $0 13,699 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) (2) 06/16/2025 M 1,749 (3) (3) Common Stock 1,749 $0 0 D
Explanation of Responses:
1. Awarded on June 15, 2022 pursuant to the Tandem Diabetes Care, Inc. 2013 Stock Incentive Plan, as amended, and the agreements related thereto (the 2013 Plan).
2. Each restricted stock unit (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.
3. The total number of shares subject to the RSU will vest over a period of three years in equal annual installments on the anniversary of the grant, subject to the terms of the 2013 Plan.
Remarks:
/s/ Rachel Malina, Attorney-in-Fact for Myoungil Cha 06/18/2025
** 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 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.

FAQ

What insider transaction did Tandem Diabetes Care (TNDM) report on 06/18/2025?

Director Myoungil Cha converted 1,749 RSUs into common stock, classified as code “M.”

How many TNDM shares does Myoungil Cha own after the transaction?

Cha now directly owns 13,699 shares of Tandem Diabetes Care common stock.

Did the insider sell any Tandem Diabetes Care shares?

No. The filing shows an RSU conversion with no shares sold and no cash proceeds.

What does transaction code “M” indicate in a Form 4?

Code “M” denotes the conversion of derivative securities, such as RSUs, into common stock.

When were the RSUs originally granted?

The RSUs were awarded on June 15, 2022 under the 2013 Stock Incentive Plan.

What is the vesting schedule for these RSUs?

The RSUs vest in three equal annual installments on each anniversary of the grant date.