Tandem Diabetes Care (TNDM) Seasonality
Recurring seasonal patterns for TNDM — the calendar windows where Tandem Diabetes Care has historically tended to rise or fall, with the win rate (how often it repeated) and average return for each, based on the last 10 years of price history.
TNDM seasonality at a glance
Over the last 10 years, TNDM's strongest seasonal window has been Aug 12 – Sep 11: it ended higher in 9 of 10 years (90% win rate) with an average return of +13.12% across a 30-day hold. On the weak side, TNDM has historically declined between Oct 17 – Nov 6, falling in 9 of 10 years (average -15.68%).
In total, our analysis finds 905 recurring seasonal windows for Tandem Diabetes Care — 598 bullish and 307 bearish. The next high-win-rate window, Aug 2 – Aug 12, opens in 6 days. These figures describe historical behaviour only — not a forecast.
TNDM's upcoming & recent seasonal patterns
Holding period:10-day20-day30-dayOrdered by season — windows opening soon first, plus a couple of recently completed high-performers. Holding-period colors help you compare durations at a glance.
| Status | Seasonal window | Hold | Avg return | Win rate | This year |
|---|---|---|---|---|---|
| Completedended 3d ago | Jul 14 – Jul 24 | 10d | +4.97% | 80% | +8.75% |
| Completedended 3d ago | Jul 4 – Jul 24 | 20d | +4.63% | 80% | +10.31% |
| Upcomingin 6d | Aug 2 – Aug 12 | 10d | -7.89% | 90% | — |
| Upcomingin 7d | Aug 3 – Aug 13 | 10d | -6.82% | 80% | — |
| Upcomingin 11d | Aug 7 – Aug 27 | 20d | +12.92% | 80% | — |
| Upcomingin 11d | Aug 7 – Sep 6 | 30d | +13.42% | 80% | — |
| Upcomingin 12d | Aug 8 – Aug 28 | 20d | +18.06% | 80% | — |
Win rate = how often the pattern repeated in the same direction. Average return = the mean move across all analysed years. Past performance does not guarantee future results.
Explore TNDM seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
TNDM seasonality FAQ
What has historically been the best month to buy TNDM stock?
Based on the last 10 years of price data, TNDM's strongest seasonal window starts in August: Aug 12 to Sep 11, which ended higher in 9 of 10 years (90% win rate) with an average return of +13.12%. Past seasonal patterns do not guarantee future performance.
What is TNDM's strongest seasonal pattern?
TNDM's highest-win-rate pattern in our data is the Aug 12 – Sep 11 window (30-day hold): up in 9 of the last 10 years with an average move of +13.12%.
When has TNDM historically performed worst?
TNDM's weakest recurring window has been Oct 17 to Nov 6, declining in 9 of 10 years with an average return of -15.68%.
How reliable are TNDM's seasonal patterns?
Each TNDM pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. TNDM currently shows 905 recurring windows (598 bullish, 307 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is TNDM stock seasonality?
Stock seasonality is the tendency of a stock to perform in a similar way during the same period each year. By analysing Tandem Diabetes Care's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where TNDM has repeatedly risen (bullish) or fallen (bearish). Each pattern is scored by its win rate and average return so you can judge how reliable and how strong it has been.
Seasonality is one input among many — it works best alongside your own research and risk management. Learn more in our guide to seasonal analysis and the tutorials.