What if you'd held DXCM?
A $1,000 investment in DexCom, Inc. (DXCM) at the month-end close of 2005-04 would be worth $35,952 at the close of 2026-08 — +3495.2% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $6,663.
Your scenario
Result
If you'd bought $1,000 at the start of each year
Value of $1,000 invested on January 1 of each year, held to 2026-08, dividends included. Click any year for the full story.
Every year, $1,000 from 2005
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2005 | $1,000 | — |
| 2006 | $661 | -33.9% |
| 2007 | $592 | -10.5% |
| 2008 | $185 | -68.7% |
| 2009 | $541 | +192.3% |
| 2010 | $915 | +69.2% |
| 2011 | $624 | -31.8% |
| 2012 | $911 | +46.0% |
| 2013 | $2,373 | +160.5% |
| 2014 | $3,690 | +55.5% |
| 2015 | $5,489 | +48.8% |
| 2016 | $4,001 | -27.1% |
| 2017 | $3,846 | -3.9% |
| 2018 | $8,029 | +108.8% |
| 2019 | $14,661 | +82.6% |
| 2020 | $24,780 | +69.0% |
| 2021 | $35,989 | +45.2% |
| 2022 | $30,359 | -15.6% |
| 2023 | $33,268 | +9.6% |
| 2024 | $20,850 | -37.3% |
| 2025 | $17,794 | -14.7% |
| 2026 | $24,097 | +35.4% |
Best and worst month-end to buy
The best single month-end close to have bought DXCM was 2008-11 ($0.50): $1,000 then is $179,760 today. The worst was 2021-10 ($156): $1,000 then is $577.
FAQ
What would $1,000 in DXCM be worth today?
A $1,000 investment in DexCom, Inc. (DXCM) at the start of 2005 would be worth about $35,952 today, a total return of +3495.2%. Dividends are reinvested in these figures.
What were the best and worst years for DXCM?
DexCom, Inc. (DXCM)'s strongest calendar year since 2005 was 2009, a +192.3% return — $1,000 held through that year became about $2,923 by year-end. Its weakest year was 2008, at -68.7%.
Does the calculator include dividends and splits?
Yes where available. Prices are adjusted for both stock splits and reinvested dividends (total return), the same measure brokerages use.
How much would $100 per month in DXCM have grown?
Investing $100 at the end of every month since 2005-04 would have grown to about $450,257 on $25,700 invested.
Did DXCM beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $6,663. DXCM beat the S&P 500 by +439.6% in total return.
Is this investment advice?
No. Wall Street Regrets is an entertainment and education tool. Every number is a historical calculation, not a prediction, and past performance never guarantees future results.
Methodology
DexCom, Inc. (DXCM) historical total-return data from 2005-04 to 2026-08, reduced to month-end closes for the tables above.
Returns use adjusted close prices from Yahoo Finance historical data — adjusted for stock splits and reinvested dividends — the same convention used by major brokerages. A "year" scenario invests $1,000 at the prior December's month-end close and values it at the latest available month-end close. Non-USD amounts are converted at historical month-end exchange rates (Yahoo Finance): to USD on the buy date and back to your currency at the latest rate, so the return reflects the currency move as well as the asset.
Month-end resolution means intra-month extremes are not captured in tables; the calculator uses exact trading-day closes where daily data is available. Figures ignore taxes, fees, and the currency effects of non-USD listings. History is not a forecast. Wall Street Regrets is entertainment, not investment advice.
What if you'd held…
Data: adjusted close prices via Yahoo Finance. As of 2026-08. Not financial advice.