Tandem Diabetes Care Inc (TNDM) stock analysis
Close on Nov 12, 2026Market cap $1.22BP/E –Yield –
StockData Score
Prices as of Nov 11, 2026How the score works
Weak6 of 30 checks passed
Tandem Diabetes Care passes 6 of the 30 checks behind our score; 12 could not be run for lack of data and count as not passed. Each dot in the shape is one check — hover it for the numbers.
- Valuation
- 2/6
- Growth
- 1/6
- Past performance
- 2/6
- Financial health
- 1/6
- Dividend
- 0/6
What stands out
Margin of safety over 20%
The price is 27.5% below fair value, more than the 20% cushion we look for.
Trading below fair value
The share price of $18.77 is below our fair value estimate of $25.88.
Gross margin improving
Gross margin was 56.6% over the last twelve months, against 53.2% a year earlier.
Net margin above its 5-year average
Net margin was -4.6% over the last twelve months, against a 5-year average of -14.0%.
What to watch
Return on equity under 15%
Return on equity was -36.7% over the last twelve months and averaged -41.6% over five years; we look for 15% on both.
Return on capital under 10%
Return on invested capital was -9.5%, below the 10% that usually covers the cost of capital.
High debt
Debt is 447% of shareholders' equity, above the 40% we consider low.
Revenue growing under 10% a year
Revenue grew 8.2% a year over the last three fiscal years, short of the 10% we look for.
Valuation2/6
P/E against its history
Not enough price and earnings history to compare.
P/E against the industry
Needs positive earnings and enough profitable companies in the industry.
EV/EBITDA against its history
Needs positive EBITDA and price history.
P/B above the industry
Tandem Diabetes Care's price-to-book of 9.67 is above the Surgical, Medical, and Dental Instruments and Supplies median of 3.22.
Trading below fair value
The share price of $18.77 is below our fair value estimate of $25.88.
Margin of safety over 20%
The price is 27.5% below fair value, more than the 20% cushion we look for.
Growth1/6
Revenue growing under 10% a year
Revenue grew 8.2% a year over the last three fiscal years, short of the 10% we look for.
EPS growth over 3 years
Needs positive EPS three years ago and today.
Earnings acceleration
Needs positive net income now, a year ago and five years ago.
Growing slower than the industry
Revenue grew 6.8% over the last twelve months; the Surgical, Medical, and Dental Instruments and Supplies median is 11.0%.
Guidance lowered
Tandem Diabetes Care lowered its year ending December 31, 2026 International sales outlook on Aug 6, 2026.
Gross margin improving
Gross margin was 56.6% over the last twelve months, against 53.2% a year earlier.
Past performance2/6
Return on equity under 15%
Return on equity was -36.7% over the last twelve months and averaged -41.6% over five years; we look for 15% on both.
Return on capital under 10%
Return on invested capital was -9.5%, below the 10% that usually covers the cost of capital.
Return on equity below the industry
Tandem Diabetes Care's return on equity of -36.7% is below the Surgical, Medical, and Dental Instruments and Supplies median of -31.3%.
Earnings over 5 years
Needs positive net income five years ago and in the latest year.
Net margin above its 5-year average
Net margin was -4.6% over the last twelve months, against a 5-year average of -14.0%.
Net margin above the industry
Tandem Diabetes Care's net margin of -4.6% is above the Surgical, Medical, and Dental Instruments and Supplies median of -14.1%.
Financial health1/6
High debt
Debt is 447% of shareholders' equity, above the 40% we consider low.
Debt trend
Needs a balance sheet from five years ago with positive equity.
Debt not well covered by cash flow
Operating cash flow over the last twelve months equals -2.4% of total debt; we look for at least 20%.
Interest not well covered
Operating income covers interest expense -2.8 times; we look for at least 5.
Short-term assets cover short-term debts
Current assets are 3.21 times current liabilities.
Elevated bankruptcy risk
The Altman Z-score is 0.63; above 3 is the safe zone and below 1.8 the distress zone.
Dividend0/6
No dividend
Tandem Diabetes Care has not paid a dividend in the last twelve months.
Yield against Treasuries
No dividend.
Yield against the market
No dividend.
Dividend stability
No dividend.
Earnings cover
No dividend.
Cash-flow cover
No dividend.
Fair value
How we estimate itOur estimate per share
$25.88
The share price is 27% below this estimate.
| Method | Multiple used | Own 5Y median | Industry median | Value per share | Weight |
|---|---|---|---|---|---|
| P/B | 5.7× | 8.2× | 3.2× | $11.16 | 50% |
| P/S | 2.6× | 2.4× | 2.8× | $40.59 | 50% |
| Fair value | $25.88 | 100% | |||
Valuation over time
Using the earnings and balance sheet published at each date, not today's.
- EV/EBITDA at month end
- Surgical, Medical, and Dental Instruments and Supplies median 16.7
An estimate from reported numbers and market multiples, not a price target or investment advice. It can be far off for companies whose profits are about to change sharply.
Market risk
From the past year of daily prices.
Liquidity
Low risk
- Average value traded per day
- $43.40M
- Value traded per 1% price move
- $13.94M
Downside
High risk
- Typical loss in a bad month
- 30.3%
- Volatility (annualized)
- 74%
- Sharpe ratio, 1 year
- 0.14
- Beta to the S&P 500 (5Y)
- 1.21
Typical bad-month loss, week by week
Margins
Share of revenue, fiscal years 2011 to 2025
Gross margin
Operating margin
Net margin
Growth rates
Compound annual growth to fiscal 2025
| Per year | 1 year | 3 years | 5 years | 10 years | Five-year pace |
|---|---|---|---|---|---|
| Revenue | +7.9% | +8.2% | +15.3% | +30.1% | |
| Gross profit | +11.5% | +9.8% | +16.0% | +35.3% |
Returns and balance sheet
10 fiscal years. Hover a measure to see how it is calculated.
| Measure | FY2016 | FY2020 | FY2025 | Trend |
|---|---|---|---|---|
| Return on equity | -290.0% | -12.3% | -97.9% | |
| Return on assets | -70.4% | -6.6% | -22.1% | |
| Current ratio | 2.93 | 6.14 | 2.55 | |
| Debt to equity | -13.32 | – | 2.00 | |
| Net debt to EBITDA | -0.44× | – | -1.29× | |
| Interest coverage | – | – | -23.7× | |
| Inventory turnover | 3.1× | 4.2× | 3.4× | |
| Capex to revenue | 10.6% | 5.5% | 2.0% | |
| Diluted shares | 3M | 61M | 67M |
Where the cash went
Fiscal 2021 to 2025, five years combined
Tandem Diabetes Care generated $227.58M from operations and spent $144.26M on capital expenditure, dividends and share buybacks. 79% of that went back into the business.
DuPont analysis
Return on equity split into margin, efficiency and leverage
| Fiscal year | Net margin | Asset turnover | Equity multiplier | Return on equity |
|---|---|---|---|---|
| FY2025 | -20.2% | 1.10× | 4.42× | -97.9% |
| FY2024 | -10.2% | 0.98× | 3.33× | -33.3% |
| FY2023 | -29.8% | 0.75× | 2.66× | -59.1% |
| FY2022 | -11.8% | 0.82× | 2.24× | -21.7% |
| FY2021 | 2.2% | 0.87× | 2.03× | 3.9% |
| FY2020 | -6.9% | 0.96× | 1.86× | -12.3% |
| FY2019 | -6.8% | 1.36× | 1.63× | -15.2% |
| FY2018 | -66.7% | 1.22× | 2.95× | -240.1% |
| FY2017 | -67.9% | 1.04× | -5.92× | 416.4% |
| FY2016 | -99.0% | 0.71× | 4.12× | -290.0% |
Piotroski F-Score
Nine tests of profitability, balance sheet and efficiency, fiscal 2025 against fiscal 2024
- ProfitableNet income above zero-$204.71M
- Cash generatingOperating cash flow above zero-$9.72M
- Return on assets improvedROA up on the prior year-10.1% → -21.2%
- Earnings backed by cashOperating cash flow above net income-$9.72M vs -$204.71M
- Less leverageLong-term debt to assets fell31.9% → 35.2%
- Better liquidityCurrent ratio rose2.93 → 2.55
- No dilutionShare count did not rise65M → 67M
- Gross margin improvedGross margin up on the prior year52.07% → 53.81%
- More efficientAsset turnover rose0.99 → 1.05
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