Tandem Diabetes Care, Inc.

TNDMNASDAQHealthcare● Active

$18.66

+$0.19(+1.03%)

Market Cap$1.3B

P/E Ratio—

52W High$29.65

52W Low$9.98

Avg Volume2.3M

Open$18.64

Beta1.57

Overview

Tandem Diabetes Care, Inc. (TNDM) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · TNDM · as of Jun 9, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

1.00

Buy/Sell (by trades)

Overall sentiment

NEUTRAL

↑ Buy 50%Active transactions only · RSU vesting excluded50% Sell ↓

Tandem Diabetes Care, Inc. insiders have shown mixed buying and selling activity over the past 12 Months.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 9, 2026

TNDM insider buying and selling by quarter

TNDM insider selling · TNDM insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

762K381K0

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 9, 2026

Active insiders

Most active in past 12 months · TNDM ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

TNDM executive sell shares · TNDM board member insider trading · TNDM insider trading SEC filing

Showing 57 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Jun 2, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Gift	7,160	—	—	33,109	Form 4
Jun 2, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Gift	7,160	—	—	0	Form 4
May 21, 2026	Allen Dick other: Chair Emeritus	Option	8,759	—	—	28,146	Form 4
May 21, 2026	Howell Peyton R Director	Option	8,759	—	—	29,836	Form 4
May 21, 2026	Malagueira Joao Paulo Falcao Director	Option	8,759	—	—	22,458	Form 4
May 21, 2026	Sodhi Rajwant Director	Option	8,759	—	—	24,280	Form 4
May 21, 2026	McGroddy-Goetz Kathleen Director	Option	8,759	—	—	26,612	Form 4
May 21, 2026	ROBERTSON REBECCA B Director	Option	8,759	—	—	22,542	Form 4
May 21, 2026	TWOMEY CHRISTOPHER J Director	Option	8,759	—	—	24,434	Form 4
May 21, 2026	Cha Myoungil Director	Option	8,759	—	—	22,458	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Option	6,439	—	—	32,859	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Award	1,336	$10.90	$15K	30,918	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Other	3,277	$12.82	$42K	29,582	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Option	898	—	—	26,877	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Option	1,437	—	—	26,711	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Other	457	$12.82	$6K	26,420	Form 4
May 15, 2026	Carpenter Rick EVP & Chief Technology Officer	Other	732	$12.82	$9K	25,979	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Option	7,667	—	—	9,937	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Award	1,337	$10.90	$15K	7,160	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Other	4,114	$12.82	$53K	5,823	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Option	1,097	—	—	2,859	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Option	1,503	—	—	2,569	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Other	589	$12.82	$8K	2,270	Form 4
May 15, 2026	Gasser Elizabeth Anne EVP, Chief Strategy Officer	Other	807	$12.82	$10K	1,762	Form 4
May 15, 2026	Hansen Shannon Marie EVP & Chief Legal Officer	Option	7,667	—	—	32,186	Form 4

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Gift

Date

Jun 2

7,160

Price

—

Value

—

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Gift

Date

Jun 2

7,160

Price

—

Value

—

View Form 4 on SEC.gov

Allen Dick

other: Chair Emeritus

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

Howell Peyton R

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

Malagueira Joao Paulo Falcao

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

Sodhi Rajwant

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

McGroddy-Goetz Kathleen

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

ROBERTSON REBECCA B

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

TWOMEY CHRISTOPHER J

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

Cha Myoungil

Director

Option

Date

May 21

8,759

Price

—

Value

—

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Option

Date

May 15

6,439

Price

—

Value

—

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Award

Date

May 15

1,336

Price

$10.90

Value

$15K

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Other

Date

May 15

3,277

Price

$12.82

Value

$42K

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Option

Date

May 15

898

Price

—

Value

—

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Option

Date

May 15

1,437

Price

—

Value

—

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Other

Date

May 15

457

Price

$12.82

Value

$6K

View Form 4 on SEC.gov

Carpenter Rick

EVP & Chief Technology Officer

Other

Date

May 15

732

Price

$12.82

Value

$9K

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Option

Date

May 15

7,667

Price

—

Value

—

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Award

Date

May 15

1,337

Price

$10.90

Value

$15K

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Other

Date

May 15

4,114

Price

$12.82

Value

$53K

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Option

Date

May 15

1,097

Price

—

Value

—

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Option

Date

May 15

1,503

Price

—

Value

—

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Other

Date

May 15

589

Price

$12.82

Value

$8K

View Form 4 on SEC.gov

Gasser Elizabeth Anne

EVP, Chief Strategy Officer

Other

Date

May 15

807

Price

$12.82

Value

$10K

View Form 4 on SEC.gov

Hansen Shannon Marie

EVP & Chief Legal Officer

Option

Date

May 15

7,667

Price

—

Value

—

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 3

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About TNDM insider trading

TNDM insider trades

Tandem Diabetes Care, Inc. (TNDM) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Gasser Elizabeth Anne (EVP, Chief Strategy Officer), Carpenter Rick (EVP & Chief Technology Officer), Hansen Shannon Marie (EVP & Chief Legal Officer). Over the past 12 months, 5 insiders have filed transactions with the SEC. TNDM insiders have been mixed buying and selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Tandem Diabetes Care, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

TNDM insider trading · 5 questions

The insiders of Tandem Diabetes Care, Inc. (TNDM) include executives and directors such as Gasser Elizabeth Anne (EVP, Chief Strategy Officer), Carpenter Rick (EVP & Chief Technology Officer), Hansen Shannon Marie (EVP & Chief Legal Officer), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

TNDM board member insider tradingwho are TNDM insidersTNDM insider rosterTandem Diabetes Care, Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 9, 2026