TNDM
$16.52+0.85%
Tandem Diabetes Care Inc.Stock · HealthcareRussell 2000 · 0.03% of IWMNasdaq Composite · 0.004% of ONEQUS Stock Market · 0.001% of VTIRussell 3000 · 0.001% of IWV
Tandem Diabetes Care Inc. monthly returns
Tandem Diabetes Care Inc. has averaged 0.89% per month, positive in 49% of months. Month-by-month returns for Tandem Diabetes Care Inc. (TNDM) below, through October 20, 2026 — the table lists the most recent months; the bar chart plots the last 5 years.
Average month
+0.9%
154 months
Best month
+83.9%
May 2018
Worst month
-66.2%
Oct 2017
Positive months
49%
of all months
Tandem Diabetes Care Inc. monthly returns#
| Month | Path | Total return |
|---|---|---|
| Oct 2026 | +1.3% | |
| Sep 2026 | -25.9% | |
| Aug 2026 | +12.9% | |
| Jul 2026 | +29.2% | |
| Jun 2026 | -12.3% | |
| May 2026 | -11.9% | |
| Apr 2026 | +1.9% | |
| Mar 2026 | -24.2% | |
| Feb 2026 | +27.2% | |
| Jan 2026 | -9.5% | |
| Dec 2025 | +4.6% | |
| Nov 2025 | +50.1% | |
| Oct 2025 | +15.3% | |
| Sep 2025 | -3.0% | |
| Aug 2025 | -19.7% | |
| Jul 2025 | -16.4% | |
| Jun 2025 | -6.0% | |
| May 2025 | +17.6% | |
| Apr 2025 | -12.1% | |
| Mar 2025 | -13.5% | |
| Feb 2025 | -40.3% | |
| Jan 2025 | +2.9% | |
| Dec 2024 | +17.6% | |
| Nov 2024 | -2.4% | |
| Oct 2024 | -26.0% | |
| Sep 2024 | -2.5% | |
| Aug 2024 | +17.6% | |
| Jul 2024 | -8.2% | |
| Jun 2024 | -21.4% | |
| May 2024 | +39.6% | |
| Apr 2024 | +3.6% | |
| Mar 2024 | +33.0% | |
| Feb 2024 | +16.8% | |
| Jan 2024 | -22.9% | |
| Dec 2023 | +46.1% | |
| Nov 2023 | +17.0% | |
| Oct 2023 | -16.7% | |
| Sep 2023 | -24.1% | |
| Aug 2023 | -21.6% | |
| Jul 2023 | +42.3% | |
| Jun 2023 | -5.6% | |
| May 2023 | -34.3% | |
| Apr 2023 | -2.5% | |
| Mar 2023 | +13.2% | |
| Feb 2023 | -12.0% | |
| Jan 2023 | -9.4% | |
| Dec 2022 | +6.9% | |
| Nov 2022 | -25.1% | |
| Oct 2022 | +17.3% | |
| Sep 2022 | +4.6% | |
| Aug 2022 | -30.9% | |
| Jul 2022 | +11.9% | |
| Jun 2022 | -13.2% | |
| May 2022 | -29.3% | |
| Apr 2022 | -17.0% | |
| Mar 2022 | +3.2% | |
| Feb 2022 | -4.6% | |
| Jan 2022 | -21.5% | |
| Dec 2021 | +17.1% | |
| Nov 2021 | -5.7% | |
| Oct 2021 | +14.2% | |
| Sep 2021 | +6.4% | |
| Aug 2021 | +3.2% | |
| Jul 2021 | +11.6% | |
| Jun 2021 | +14.1% | |
| May 2021 | -7.1% | |
| Apr 2021 | +4.1% | |
| Mar 2021 | -8.1% | |
| Feb 2021 | +3.6% | |
| Jan 2021 | -3.2% | |
| Dec 2020 | +1.9% | |
| Nov 2020 | -13.9% | |
| Oct 2020 | -4.0% | |
| Sep 2020 | +0.7% | |
| Aug 2020 | +7.9% | |
| Jul 2020 | +5.6% | |
| Jun 2020 | +19.0% | |
| May 2020 | +4.2% | |
| Apr 2020 | +24.0% | |
| Mar 2020 | -13.8% | |
| Feb 2020 | -1.8% | |
| Jan 2020 | +27.6% | |
| Dec 2019 | -13.6% | |
| Nov 2019 | +12.1% | |
| Oct 2019 | +4.4% | |
| Sep 2019 | -18.6% | |
| Aug 2019 | +14.2% | |
| Jul 2019 | -1.7% | |
| Jun 2019 | -5.9% | |
| May 2019 | +11.6% | |
| Apr 2019 | -3.3% | |
| Mar 2019 | -3.2% | |
| Feb 2019 | +50.8% | |
| Jan 2019 | +14.5% | |
| Dec 2018 | +3.1% | |
| Nov 2018 | -2.1% | |
| Oct 2018 | -12.2% | |
| Sep 2018 | -6.2% | |
| Aug 2018 | +65.8% | |
| Jul 2018 | +25.2% | |
| Jun 2018 | +56.9% | |
| May 2018 | +83.9% | |
| Apr 2018 | +53.8% | |
| Mar 2018 | +57.0% | |
| Feb 2018 | +13.7% | |
| Jan 2018 | +17.8% | |
| Dec 2017 | -11.6% | |
| Nov 2017 | +8.1% | |
| Oct 2017 | -66.2% | |
| Sep 2017 | -13.1% | |
| Aug 2017 | +74.3% | |
| Jul 2017 | -39.8% | |
| Jun 2017 | +0.6% | |
| May 2017 | -16.6% | |
| Apr 2017 | -20.6% | |
| Mar 2017 | -50.0% | |
| Feb 2017 | +2.1% | |
| Jan 2017 | +9.3% | |
| Dec 2016 | -12.2% | |
| Nov 2016 | -59.5% |
Monthly total return (since Nov 2021)#
-40%-20%0%20%40%
Nov 2021-5.7%
Dec 2021+17%
Jan 2022-22%2022
Feb 2022-4.6%
Mar 2022+3.2%
Apr 2022-17%
May 2022-29%
Jun 2022-13%
Jul 2022+12%
Aug 2022-31%
Sep 2022+4.6%
Oct 2022+17%
Nov 2022-25%
Dec 2022+6.9%
Jan 2023-9.4%2023
Feb 2023-12%
Mar 2023+13%
Apr 2023-2.5%
May 2023-34%
Jun 2023-5.6%
Jul 2023+42%
Aug 2023-22%
Sep 2023-24%
Oct 2023-17%
Nov 2023+17%
Dec 2023+46%
Jan 2024-23%2024
Feb 2024+17%
Mar 2024+33%
Apr 2024+3.6%
May 2024+40%
Jun 2024-21%
Jul 2024-8.2%
Aug 2024+18%
Sep 2024-2.5%
Oct 2024-26%
Nov 2024-2.4%
Dec 2024+18%
Jan 2025+2.9%2025
Feb 2025-40%
Mar 2025-13%
Apr 2025-12%
May 2025+18%
Jun 2025-6.0%
Jul 2025-16%
Aug 2025-20%
Sep 2025-3.0%
Oct 2025+15%
Nov 2025+50%
Dec 2025+4.6%
Jan 2026-9.5%2026
Feb 2026+27%
Mar 2026-24%
Apr 2026+1.9%
May 2026-12%
Jun 2026-12%
Jul 2026+29%
Aug 2026+13%
Sep 2026-26%
Oct 2026+1.3%
Tandem Diabetes Care Inc. returns by calendar month#
Every month of every year since 2014, one tick per year on a shared scale; the dark bar is the month's average. Total returns, dividends reinvested.
October 2026 so far: +1.29% — 7th of 13 Octobers since 2014 at the last close; the average October returned -6.0%.
| Month | −85%0+85% | Average | Median | Up | Best | Worst |
|---|---|---|---|---|---|---|
| Jan | -1.6% | -3.2% | 46% | +27.6% 2020 | -23.7% 2016 | |
| Feb | +3.8% | -0.4% | 46% | +50.8% 2019 | -40.3% 2025 | |
| Mar | -1.2% | -3.2% | 38% | +57.0% 2018 | -50.0% 2017 | |
| Apr | +3.5% | +1.9% | 54% | +53.8% 2018 | -20.6% 2017 | |
| May | -0.0% | -7.6% | 38% | +83.9% 2018 | -41.1% 2016 | |
| Jun | +2.4% | -5.6% | 46% | +56.9% 2018 | -21.4% 2024 | |
| Jul | +3.1% | +5.6% | 54% | +42.3% 2023 | -39.8% 2017 | |
| Aug | +10.5% | +7.9% | 69% | +74.3% 2017 | -30.9% 2022 | |
| Sep | -7.9% | -5.2% | 31% | +7.4% 2016 | -25.9% 2026 | |
| Oct | -6.0% | -0.5% | 50% | +19.7% 2014 | -66.2% 2017 | |
| Nov | -1.6% | -2.2% | 42% | +50.1% 2025 | -59.5% 2016 | |
| Dec | +5.4% | +3.9% | 67% | +46.1% 2023 | -13.6% 2019 |
Methodology#
Monthly returns are total returns (dividends reinvested), computed from TNDM's split- and dividend-adjusted month-end closes. The table shows the most recent 120 months and the bar chart the most recent 60. See the year-by-year returns for the annual view. Past performance does not predict future returns; not investment advice.
FAQ#
- What is Tandem Diabetes Care Inc.'s average monthly return?
- Tandem Diabetes Care Inc. (TNDM) has averaged about 0.89% per month, positive in roughly 49% of months. The best month was May 2018 (+83.9%) and the worst was Oct 2017 (-66.2%).
More on Tandem Diabetes Care Inc.
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