TNDMTandem Diabetes Care, Inc.
What is the market doing?
The market is leaning against it: in a downtrend (−8% vs 200-day) and a crowded short (+19% of shares).
In a downtrend, below its 50- and 200-day averages. Price is −8% vs its 200-day average.
A crowded short, settled Sep 30, 2026, about a week of normal trading to cover. Up 7.2% since the previous count, up from 18.3% of shares outstanding three months ago.
Against the whole market›
Percentile against every name Ryufin tracks. Higher is better; the tick marks the middle of the market. Context, not one of the checks above.
Where this answer is blind. Insider selling is often routine (taxes, diversification); only cluster buying is a strong tell.
How TNDM is trading
Tandem Diabetes Care, Inc. is +14% over the past year while the S&P 500 is +16%: 2.0 points behind the market.
1-year return · S&P 500 +16%
- vs 200-day average
- −8.5%
vs 200-day average · below trend, but not far
- RSI (14)
- 59
RSI (14) · neutral
- Below its 52-week high
- 38%
Below its 52-week high
Details›
- Last close2026-10-23
- $17.43
- 1 monthS&P 500 −0.94%
- +15%
- 1 yearS&P 500 +16%
- +14%
- 5 yearsS&P 500 +86%
- −86%
- vs 50-day average$18.41
- −5.3%
- 52-week high
- $28.26
- 52-week low
- $12.82
- Annualised volatility
- 76%
| Year | Return |
|---|---|
| 2026 (year to date) | −21% |
| 2025 | −39% |
| 2024 | +22% |
| 2023 | −34% |
| 2022 | −70% |
| 2021 | +57% |
| 2020 | +61% |
| 2019 | +57% |
| 2018 | +1509% |
| 2017 | −89% |
| Month | Years | Positive | Average |
|---|---|---|---|
| Jan | 10 | 5 of 10 | +0.56% |
| Feb | 10 | 6 of 10 | +5.6% |
| Mar | 10 | 4 of 10 | −0.63% |
| Apr | 10 | 5 of 10 | +3.2% |
| May | 10 | 5 of 10 | +5.8% |
| Jun | 10 | 4 of 10 | +2.6% |
| Jul | 11 | 6 of 11 | +3.3% |
| Aug | 11 | 8 of 11 | +13% |
| Sep | 11 | 4 of 11 | −6.8% |
| Oct | 11 | 5 of 11 | −8.0% |
| Nov | 10 | 4 of 10 | −2.1% |
| Dec | 10 | 7 of 10 | +6.0% |
End-of-day closes from IEX; the S&P 500 comparison uses SPY over the same window. Prices are a reference point, not a basis for trading decisions.
Where the price stands
Its trend against the 50-day and 200-day averages, and the levels it keeps coming back to.
What it has returned
With dividends, year by year, month by month, and by calendar month on average.