Tandem Diabetes CSO vests 3,014 RSUs, withholds tax

Q: What insider transaction did TNDM report for Elizabeth Anne Gasser on August 15, 2026?

Elizabeth Anne Gasser exercised 3,014 RSUs into common stock of TANDEM DIABETES CARE INC (TNDM). The RSUs converted into an equal number of common shares pursuant to prior equity awards under the company’s 2023 Long-Term Incentive Plan.

Q: Were any TNDM shares sold on the market in this Form 4 filing?

No market sales occurred. The filing states that 1,618 shares were withheld by the issuer solely to satisfy tax withholding requirements upon RSU vesting, and explicitly notes that no shares were sold.

Q: At what price were TNDM shares withheld for taxes in this Form 4?

Shares were withheld at a price of $22.72 per share. The company used this per-share value when withholding 1,618 shares of common stock to cover the reporting person’s tax liability associated with vesting RSUs.

Q: How many TNDM shares does Elizabeth Anne Gasser hold indirectly after these transactions?

After the reported transactions, 33,109 shares of TNDM common stock are reported as held indirectly. These shares are owned by The Gasser Family Trust, for which Elizabeth Anne Gasser serves as a co-trustee.

Q: Were the TNDM Form 4 transactions under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirming a trading plan. The transactions instead relate to RSU vesting and associated tax withholding under Tandem Diabetes Care’s 2023 Long-Term Incentive Plan.

TANDEM DIABETES CARE INC (TNDM) reported that EVP and Chief Strategy Officer Elizabeth Anne Gasser exercised 3,014 Restricted Stock Units into an equal number of shares of common stock on August 15, 2026.

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Form Type

Rhea-AI Filing Summary

TANDEM DIABETES CARE INC (TNDM) reported that EVP and Chief Strategy Officer Elizabeth Anne Gasser exercised 3,014 Restricted Stock Units into an equal number of shares of common stock on August 15, 2026. Of these, 1,618 shares of common stock were withheld at $22.72 per share to satisfy tax withholding requirements upon RSU vesting, and the company notes that no shares were sold in the market. Following these transactions, 33,109 shares of common stock are reported as held indirectly through The Gasser Family Trust, where she is a co-trustee.

Insider Trade Summary

3,014 shares exercised/converted

Exercise 7 txns

Insider Gasser Elizabeth Anne

Role EVP, Chief Strategy Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit ^{F3, F4, F5}	1,097	$0.00	$0.00
Exercise	Restricted Stock Unit ^{F6, F4, F7}	1,917	$0.00	$0.00
Exercise	Common Stock	1,097	$0.00	$0.00
Tax Withholding	Common Stock ^F1	589	$22.72	$13K
Exercise	Common Stock	1,917	$0.00	$0.00
Tax Withholding	Common Stock ^F1	1,029	$22.72	$23K
holding	Common Stock ^F2	--	--	--

Holdings After Transaction: Restricted Stock Unit — 16,708 contracts (Direct); Common Stock — 1,396 shares (Direct); Common Stock — 33,109 shares (Indirect, See Footnote)

Footnotes (7)

F1. Shares withheld by the Issuer to satisfy tax withholding requirements upon the vesting of restricted stock units (RSUs). No shares were sold.
F2. The securities are held by The Gasser Family Trust dated September 1, 2011, of which Elizabeth A. Gasser is a co-trustee.
F3. Awarded on May 23, 2024 pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan).
F4. 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.
F5. One-third of the RSUs granted on May 23, 2024 vested on May 15, 2025, with the remaining RSUs vesting in eight (8) equal quarterly installments thereafter, subject to the terms of the 2023 Plan.
F6. Awarded on May 30, 2025 pursuant to the 2023 Plan.
F7. One-third of the RSUs granted on May 30, 2025 vested on May 15, 2026, with the remaining RSUs vesting in eight (8) equal quarterly installments thereafter, subject to the terms of the 2023 Plan.

Key Figures

RSUs Exercised: 3,014 shares Shares Withheld for Taxes: 1,618 shares Tax Withholding Price: $22.72 per share +1 more

4 metrics

RSUs Exercised 3,014 shares Total Restricted Stock Units converted into common stock on August 15, 2026

Shares Withheld for Taxes 1,618 shares Common shares withheld to satisfy tax withholding requirements upon RSU vesting

Tax Withholding Price $22.72 per share Per-share value used for shares withheld under transaction code F

Indirect Holdings After Transactions 33,109 shares Common stock held indirectly via The Gasser Family Trust after the reported transactions

Key Terms

Restricted Stock Unit, tax withholding requirements, indirect, 2023 Long-Term Incentive Plan

4 terms

Restricted Stock Unit financial

"Awarded on May 23, 2024 pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan"

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.

tax withholding requirements financial

"Shares withheld by the Issuer to satisfy tax withholding requirements upon the vesting of restricted stock units"

indirect financial

"The securities are held by The Gasser Family Trust... of which Elizabeth A. Gasser is a co-trustee."

2023 Long-Term Incentive Plan financial

"pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan, as amended"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did TNDM report for Elizabeth Anne Gasser on August 15, 2026?

Elizabeth Anne Gasser exercised 3,014 RSUs into common stock of TANDEM DIABETES CARE INC (TNDM). The RSUs converted into an equal number of common shares pursuant to prior equity awards under the company’s 2023 Long-Term Incentive Plan.

Were any TNDM shares sold on the market in this Form 4 filing?

No market sales occurred. The filing states that 1,618 shares were withheld by the issuer solely to satisfy tax withholding requirements upon RSU vesting, and explicitly notes that no shares were sold.

At what price were TNDM shares withheld for taxes in this Form 4?

Shares were withheld at a price of $22.72 per share. The company used this per-share value when withholding 1,618 shares of common stock to cover the reporting person’s tax liability associated with vesting RSUs.

How many TNDM shares does Elizabeth Anne Gasser hold indirectly after these transactions?

After the reported transactions, 33,109 shares of TNDM common stock are reported as held indirectly. These shares are owned by The Gasser Family Trust, for which Elizabeth Anne Gasser serves as a co-trustee.

Were the TNDM Form 4 transactions under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirming a trading plan. The transactions instead relate to RSU vesting and associated tax withholding under Tandem Diabetes Care’s 2023 Long-Term Incentive Plan.

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

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Available on EDGAR 08/18/2026 - 04:28 PM Accepted by SEC EDGAR 08/18/2026 - 04:27 PM

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^*

Gasser Elizabeth Anne

(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)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP, Chief Strategy Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	08/15/2026		M		1,097	A	$0	1,097	D
Common Stock	08/15/2026		F⁽¹⁾		589	D	$22.72	508	D
Common Stock	08/15/2026		M		1,917	A	$0	2,425	D
Common Stock	08/15/2026		F⁽¹⁾		1,029	D	$22.72	1,396	D
Common Stock								33,109	I	See Footnote⁽²⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Unit⁽³⁾	⁽⁴⁾	08/15/2026		M			1,097	⁽⁵⁾	⁽⁵⁾	Common Stock	1,097	$0	3,290	D
Restricted Stock Unit⁽⁶⁾	⁽⁴⁾	08/15/2026		M			1,917	⁽⁷⁾	⁽⁷⁾	Common Stock	1,917	$0	13,418	D

Explanation of Responses:

1. Shares withheld by the Issuer to satisfy tax withholding requirements upon the vesting of restricted stock units (RSUs). No shares were sold.

2. The securities are held by The Gasser Family Trust dated September 1, 2011, of which Elizabeth A. Gasser is a co-trustee.

3. Awarded on May 23, 2024 pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 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 2023 Plan.

5. One-third of the RSUs granted on May 23, 2024 vested on May 15, 2025, with the remaining RSUs vesting in eight (8) equal quarterly installments thereafter, subject to the terms of the 2023 Plan.

6. Awarded on May 30, 2025 pursuant to the 2023 Plan.

7. One-third of the RSUs granted on May 30, 2025 vested on May 15, 2026, with the remaining RSUs vesting in eight (8) equal quarterly installments thereafter, subject to the terms of the 2023 Plan.

Remarks:

	/s/ Jerilyn Laskie, Attorney-in-Fact for Elizabeth A. Gasser	08/18/2026
	** 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)

Source: View Original Filing on SEC EDGAR