What if you'd held TBT?
A $1,000 investment in ProShares UltraShort Lehman 20 Year Treasury (TBT) at the month-end close of 2008-05 would be worth $155 at the close of 2026-08 — -84.5% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $5,504.
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.
Every year, $1,000 from 2008
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2008 | $1,000 | — |
| 2009 | $1,322 | +32.2% |
| 2010 | $982 | -25.7% |
| 2011 | $479 | -51.2% |
| 2012 | $420 | -12.2% |
| 2013 | $525 | +24.8% |
| 2014 | $307 | -41.4% |
| 2015 | $292 | -5.0% |
| 2016 | $270 | -7.4% |
| 2017 | $224 | -17.2% |
| 2018 | $235 | +5.0% |
| 2019 | $181 | -22.9% |
| 2020 | $112 | -37.9% |
| 2021 | $116 | +2.9% |
| 2022 | $224 | +93.3% |
| 2023 | $218 | -2.5% |
| 2024 | $278 | +27.7% |
| 2025 | $274 | -1.4% |
| 2026 | $298 | +8.6% |
Best and worst month-end to buy
The best single month-end close to have bought TBT was 2020-07 ($12.53): $1,000 then is $2,998 today. The worst was 2008-05 ($242): $1,000 then is $155.
FAQ
What would $1,000 in TBT be worth today?
A $1,000 investment in ProShares UltraShort Lehman 20 Year Treasury (TBT) at the start of 2008 would be worth about $155 today, a total return of -84.5%. Dividends are reinvested in these figures.
What were the best and worst years for TBT?
ProShares UltraShort Lehman 20 Year Treasury (TBT)'s strongest calendar year since 2008 was 2022, a +93.3% return — $1,000 held through that year became about $1,933 by year-end. Its weakest year was 2011, at -51.2%.
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 TBT have grown?
Investing $100 at the end of every month since 2008-05 would have grown to about $24,654 on $22,000 invested.
Did TBT beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $5,504. TBT trailed the S&P 500 by +97.2% 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
ProShares UltraShort Lehman 20 Year Treasury (TBT) historical total-return data from 2008-05 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.