Tandem Diabetes Care, Inc. (TNDM)
TNDM moved a median of +0.13% 30 minutes after news, and +0.12% by the close. How TNDM actually reacts to news — the realized, point-in-time move the market made, measured across 895 labeled events over the last three years with zero look-ahead.
TNDM’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.04% | 46% | 894 |
| 30-min | +0.13% | 57% | 895 |
| 60-min | +0.07% | 52% | 895 |
| to close | +0.12% | 51% | 891 |
| Middle 50% of TNDM reactions | -0.66% to +1.25% |
|---|---|
| Median reaction (30-min) | +0.13% |
| Measured reactions | 895 |
Half of all Tandem Diabetes Care, Inc. news events land between -0.66% and +1.25% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How TNDM reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 43 | +0.14% | 51% | +0.05% |
| Analyst downgrades | 26 | -0.30% | 39% | -0.13% |
| Coverage initiations | 46 | -0.48% | 37% | -0.76% |
| Rating reiterations | 96 | +0.09% | 56% | -0.10% |
| Price-target raises | 24 | +0.54% | 71% | +0.87% |
| Price-target cuts | 20 | -0.11% | 45% | +0.05% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how TNDM ranks against every other measured name →
That’s how TNDM usually reacts — get an email when it moves on news →Email me when TNDM moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to TNDM's baseline. Nothing else.
Recent TNDM events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Tandem Diabetes Care to Announce Third Quarter 2026 Financial Results on November 5, 2026 | Press release | Business Wire | -1.74% | -0.96% | |
| Tandem Mobi Automated Insulin Delivery System Now Available in Twelve International Markets | Press release | Business Wire | +2.63% | +5.26% | |
| Form 10-Q TANDEM DIABETES CARE For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +9.89% | +30.27% | |
| Form 8-K TANDEM DIABETES CARE For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | +9.89% | +30.27% | |
| Tandem Diabetes Care Announces Second Quarter 2026 Financial Results | Press release | Business Wire | +9.89% | +30.27% | |
| Tandem Diabetes Care Announces Upcoming Conference Presentation | Press release | Business Wire | -0.28% | +4.50% | |
| Tandem Diabetes Care Launches t:slim X2 Insulin Pump Compatibility with Abbott FreeStyle Libre 3 Plus Sensor in Five International Markets | Press release | Business Wire | +1.69% | +4.30% | |
| Tandem Diabetes Care to Announce Second Quarter 2026 Financial Results on August 6, 2026 | Press release | Business Wire | +0.25% | -4.55% | |
| Tandem Diabetes Care Automated Insulin Delivery Systems Receive CE Mark for Type 2 Diabetes and Type 1 Diabetes During Pregnancy | Press release | Business Wire | +2.05% | -0.97% | |
| Form SD TANDEM DIABETES CARE | SEC filing · Form SD | SEC EDGAR | +1.19% | +2.20% | |
| Form S-8 TANDEM DIABETES CARE | SEC filing · Form S-8 | SEC EDGAR | -0.38% | +14.60% | |
| Form 8-K TANDEM DIABETES CARE For: May 20 | SEC filing · Form 8-K | SEC EDGAR | -0.06% | -4.92% | |
| Form 8-K TANDEM DIABETES CARE For: May 11 | SEC filing · Form 8-K | SEC EDGAR | -2.64% | -6.08% | |
| Form 10-Q TANDEM DIABETES CARE For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -6.55% | -22.60% | |
| Form 8-K TANDEM DIABETES CARE For: May 07 | SEC filing · Form 8-K | SEC EDGAR | -6.55% | -22.60% | |
| Tandem Diabetes Care Announces First Quarter 2026 Financial Results | Press release | Business Wire | -6.55% | -22.60% | |
| Tandem Diabetes Care Announces Upcoming Conference Presentations | Press release | Business Wire | +4.48% | +6.58% | |
| Tandem Diabetes Care’s Control-IQ+ Automated Insulin Delivery Technology Now FDA Cleared for Pregnancy in Type 1 Diabetes | Press release | Business Wire | +0.59% | -1.88% | |
| Form ARS TANDEM DIABETES CARE For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -1.60% | +1.76% | |
| Form DEF 14A TANDEM DIABETES CARE For: Dec 31 | SEC filing · Form DEF | SEC EDGAR | -0.93% | +0.15% | |
| Form DEFA14A TANDEM DIABETES CARE | SEC filing · Form DEFA14A | SEC EDGAR | -0.93% | +0.15% | |
| Tandem Diabetes Care to Announce First Quarter 2026 Financial Results on May 7, 2026 | Press release | Business Wire | -0.36% | +3.85% | |
| Form PRE 14A TANDEM DIABETES CARE For: Dec 31 | SEC filing · Form PRE | SEC EDGAR | -1.68% | -7.62% | |
| Tandem Mobi Now Compatible with Android Smartphones | Press release | Business Wire | +1.31% | -0.79% | |
| Form 8-K TANDEM DIABETES CARE For: Feb 23 | SEC filing · Form 8-K | SEC EDGAR | -0.04% | +1.41% | |
| Tandem Diabetes Care Prices Upsized Private Placement of $265 Million of Convertible Senior Notes Due 2032 | Press release | Business Wire | -0.74% | -3.31% | |
| Tandem Diabetes Care Announces Proposed Private Placement of Convertible Notes | Press release | Business Wire | +2.93% | +4.63% | |
| Form 10-K TANDEM DIABETES CARE For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -1.41% | +8.00% | |
| Form 8-K TANDEM DIABETES CARE For: Feb 19 | SEC filing · Form 8-K | SEC EDGAR | -1.41% | +8.00% | |
| Tandem Diabetes Care Announces Fourth Quarter and Full Year 2025 Financial Results and 2026 Financial Guidance | Press release | Business Wire | -1.41% | +8.00% | |
| Tandem Diabetes Care Announces Upcoming Conference Presentations | Press release | Business Wire | +1.00% | +0.00% | |
| Tandem Diabetes Care to Announce Fourth Quarter and Full Year 2025 Financial Results on February 19, 2026 | Press release | Business Wire | -0.69% | -5.78% | |
| Form 8-K TANDEM DIABETES CARE For: Dec 26 | SEC filing · Form 8-K | SEC EDGAR | -0.04% | -1.48% | |
| Clinical ink announces collaboration with Tandem Diabetes Care to integrate Automated Insulin Delivery data into the GlucoseReady™ connected device software platform | Press release | PR Web | +0.95% | +5.15% | |
| Tandem t:slim Mobile App Now Available in Canada | Press release | Business Wire | +0.27% | -2.85% | |
| Form 8-K TANDEM DIABETES CARE For: Nov 07 | SEC filing · Form 8-K | SEC EDGAR | +1.50% | +3.85% | |
| Tandem Diabetes Care Announces Appointment of Sandra Beaver to Board of Directors | Press release | Business Wire | +1.50% | +3.85% | |
| Tandem Mobi Receives FDA Clearance for Use with Android Smartphones | Press release | Business Wire | -0.76% | -0.85% | |
| Form 10-Q TANDEM DIABETES CARE For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -2.50% | +1.63% | |
| Form 8-K TANDEM DIABETES CARE For: Nov 06 | SEC filing · Form 8-K | SEC EDGAR | -2.50% | +1.63% | |
| Tandem Diabetes Care Announces Third Quarter 2025 Financial Results | Press release | Business Wire | -2.50% | +1.63% | |
| Tandem Diabetes Care Achieves ISO/IEC 27001:2022 Certification, Reinforcing Commitment to Global Data Security Standards | Press release | Business Wire | -0.18% | +6.89% | |
| Tandem Diabetes Care Announces Upcoming Conference Presentations | Press release | Business Wire | -0.64% | +1.34% | |
| t:slim X2™ Insulin Pump Now Available with Abbott’s FreeStyle Libre® 3 Plus Sensor in the United States | Press release | Business Wire | -0.17% | +0.20% | |
| Tandem Diabetes Care to Announce Third Quarter 2025 Financial Results on November 6, 2025 | Press release | Business Wire | +0.91% | +11.36% | |
| Tandem t:slim X2 Insulin Pump Now Compatible With Lyumjev Ultra-Rapid Acting Insulin in the United States | Press release | Business Wire | -1.61% | -2.40% | |
| Tandem Diabetes Care Announces Publication Showing Adults With Type 2 Diabetes Benefit from Automated Insulin Delivery Regardless of C-Peptide Levels | Press release | Business Wire | +0.29% | +2.31% | |
| Bronstein, Gewirtz & Grossman, LLC Initiates an Investigation into Allegations Against Bronstein, Gewirtz & Grossman, LLC (TNDM) And Encourages Shareholders to Reach Out | Press release | ACCESS Newswire | +0.40% | +1.13% | |
| Bronstein, Gewirtz & Grossman, LLC Announces an Investigation Against Bronstein, Gewirtz & Grossman, LLC (TNDM) and Encourages Shareholders to Learn More About the Investigation | Press release | ACCESS Newswire | +0.66% | +1.39% | |
| Tandem t:slim Mobile App Now Authorized by Health Canada for iPhone and Android Phones | Press release | Business Wire | -2.42% | -0.08% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the TNDM section they belong to.
Where else TNDM is measured.
TNDM earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| KemPharm, Inc. (KMPH) | 901 | -0.21% | 40% |
| Nektar Therapeutics (NKTR) | 898 | +0.07% | 53% |
| Flexion Therapeutics, Inc. (FLXN) | 891 | 0.00% | 48% |
| Paratek Pharmaceuticals, Inc. (PRTK) | 891 | -0.18% | 44% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Healthcare names, measured the same way →
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How the numbers are made.
How is Tandem Diabetes Care, Inc.'s median reaction calculated?
Every labeled TNDM news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 895 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 57% of TNDM's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does TNDM's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.