NASDAQ:TNDM

Tandem Diabetes Care Stock Insider Trading

Healthcare > Medical - Devices

Buy TNDM

*Your capital is at risk

$19.50

+0.490 (+2.58%)

At Close: Jul 31, 2026

Tandem Diabetes Care Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be positive at 89.53. In total, the insiders bought 825.7K and sold 60.28K TNDM shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	89.53
● Buy	825.7K shares
● Sell	60.28K shares
80% Buy Activity Moderate Negative Correlation
Buy Signal High Confidence May 29, 2026 Analysis Breakdown: Strongly supported by a very high Insider Power Score of 89.53. Confidence increased due to high data reliability score of 100. Supported by overwhelming buy-side pressure (80% buys).

Historical Insider Trades

Date	Type	Person	Role	Amount
May 21, 2026 Buy	Common Stock M-Exempt	Robertson Rebecca B Director	Director	8 759 Value: $138.0K
May 21, 2026 Buy	Common Stock M-Exempt	Mcgroddy-goetz Kathleen Director	Director	8 759 Value: $138.0K
May 21, 2026 Buy	Restricted Stock Unit M-Exempt	Malagueira Joao Paulo Falcao Director	Director	8 759 Value: $138.0K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Allen Dick Chair Emeritus	Other	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Howell Peyton R Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Malagueira Joao Paulo Falcao Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Robertson Rebecca B Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Twomey Christopher J Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Cha Myoungil Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Mcgroddy-goetz Kathleen Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Sodhi Rajwant Director	Director	10 220 Value: $153.7K
May 20, 2026 Buy	Restricted Stock Unit A-Award	Beaver Sandra Director	Director	5 110 Value: $76.9K
May 15, 2026 Buy	Common Stock M-Exempt	Vosseller Leigh EVP & Chief Financial Officer	C-Suite Officer	10 496 Value: $134.6K
May 15, 2026 Buy	Common Stock A-Award	Vosseller Leigh EVP & Chief Financial Officer	C-Suite Officer	1 336 Value: $14.6K
May 15, 2026 Sell	Common Stock F-InKind	Vosseller Leigh EVP & Chief Financial Officer	C-Suite Officer	3 766 Value: $48.3K
May 15, 2026 Buy	Common Stock M-Exempt	Vosseller Leigh EVP & Chief Financial Officer	C-Suite Officer	1 496 Value: $19.2K
May 15, 2026 Sell	Common Stock F-InKind	Vosseller Leigh EVP & Chief Financial Officer	C-Suite Officer	537 Value: $7K
May 15, 2026 Buy	Common Stock M-Exempt	Vosseller Leigh EVP & Chief Financial Officer	C-Suite Officer	1 503 Value: $19.3K
May 15, 2026 Buy	Common Stock M-Exempt	Novara Mark David EVP & Chief Commercial Officer	Officer	76 Value: $974
May 15, 2026 Sell	Common Stock F-InKind	Novara Mark David EVP & Chief Commercial Officer	Officer	57 Value: $731
May 15, 2026 Buy	Restricted Stock Unit M-Exempt	Novara Mark David EVP & Chief Commercial Officer	Officer	10 496 Value: $134.6K
May 15, 2026 Buy	Restricted Stock Unit M-Exempt	Novara Mark David EVP & Chief Commercial Officer	Officer	76 Value: $974
May 15, 2026 Buy	Common Stock M-Exempt	Sheridan John F President & CEO	CEO / President	39 735 Value: $509.4K
May 15, 2026 Sell	Common Stock F-InKind	Sheridan John F President & CEO	CEO / President	18 944 Value: $242.9K
May 15, 2026 Sell	Common Stock F-InKind	Morrison Susan EVP & Chief Admin. Officer	Officer	430 Value: $6K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT TANDEM DIABETES CARE

Tandem Diabetes Care, Inc., a medical device company, designs, develops, and commercializes various products for people with insulin-dependent diabetes in the United States and internationally. The company's flagship product is the t:slim X2 insulin delivery system, a pump platform that comprises t:slim X2 pump, its 300-unit disposable insulin cartridge, and an infusion set. It also provides t:slim X2 insulin with Basal-IQ and control IQ technolo...

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