Seasonality
TNDM seasonality — Tandem Diabetes Care
Over the last 11 years, TNDM's strongest month on average has been August (+12.4%) and its weakest September (-8.2%).
Average return by month
Month-by-month statistics
| Month | Avg | Median | Up % | Best | Worst | Yrs |
|---|---|---|---|---|---|---|
| Jan | +0.56% | -0.14% | 50% | +27.6% | -22.9% | 10 |
| Feb | +5.55% | +2.87% | 60% | +50.8% | -40.3% | 10 |
| Mar | -0.63% | -5.61% | 40% | +57.0% | -50.0% | 10 |
| Apr | +3.19% | -0.34% | 50% | +53.8% | -20.6% | 10 |
| May | +5.78% | -1.43% | 50% | +83.9% | -34.3% | 10 |
| Jun | +2.64% | -5.74% | 40% | +57.0% | -21.4% | 10 |
| Jul | +5.96% | +8.59% | 60% | +42.3% | -39.8% | 10 |
| Aug | +12.36% | +10.39% | 70% | +74.3% | -30.9% | 10 |
| Sep | -8.16% | -4.60% | 30% | +6.4% | -25.9% | 10 |
| Oct | -5.66% | +0.22% | 50% | +17.4% | -66.2% | 10 |
| Nov | +4.23% | -2.10% | 44% | +50.1% | -25.1% | 9 |
| Dec | +5.99% | +3.87% | 70% | +46.1% | -13.7% | 10 |
Monthly returns heat map — TNDM
price return, %| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | -9.5 | 27.2 | -24.2 | 1.9 | -11.9 | -12.3 | 29.2 | 12.9 | -25.9 | 17.2 | -11.5 | -23.1% | |
| 2025 | 2.9 | -40.3 | -13.5 | -12.1 | 17.6 | -6.0 | -16.4 | -19.7 | -3.0 | 15.3 | 50.1 | 4.6 | -39.0% |
| 2024 | -22.9 | 16.8 | 33.0 | 3.6 | 39.6 | -21.4 | -8.2 | 17.6 | -2.5 | -26.0 | -2.4 | 17.6 | +21.8% |
| 2023 | -9.4 | -12.0 | 13.2 | -2.5 | -34.3 | -5.6 | 42.3 | -21.6 | -24.1 | -16.7 | 17.0 | 46.1 | -34.2% |
| 2022 | -21.5 | -4.6 | 3.2 | -17.0 | -29.3 | -13.2 | 11.9 | -30.9 | 4.6 | 17.4 | -25.1 | 6.9 | -70.1% |
| 2021 | -3.2 | 3.6 | -8.1 | 4.1 | -7.1 | 14.1 | 11.6 | 3.2 | 6.4 | 14.2 | -5.7 | 17.1 | +57.3% |
| 2020 | 27.6 | -1.8 | -13.8 | 24.0 | 4.2 | 19.0 | 5.6 | 7.9 | 0.7 | -4.0 | -13.9 | 1.9 | +60.5% |
| 2019 | 14.5 | 50.8 | -3.2 | -3.3 | 11.6 | -5.9 | -1.7 | 14.2 | -18.6 | 4.4 | 12.1 | -13.7 | +57.0% |
| 2018 | 17.8 | 13.7 | 57.0 | 53.8 | 83.9 | 57.0 | 25.2 | 65.8 | -6.2 | -12.2 | -2.1 | 3.1 | +1508.9% |
| 2017 | 9.3 | 2.1 | -50.0 | -20.6 | -16.6 | 0.6 | -39.8 | 74.3 | -13.1 | -66.2 | 8.1 | -11.6 | -89.0% |
| 2016 | -12.2 |