What if you'd held AGG?
A $1,000 investment in iShares Core U.S. Aggregate Bond ETF (AGG) at the month-end close of 2003-09 would be worth $1,976 at the close of 2026-08 — +97.6% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $7,739.
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 2003
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2003 | $1,000 | — |
| 2004 | $1,038 | +3.8% |
| 2005 | $1,061 | +2.2% |
| 2006 | $1,103 | +3.9% |
| 2007 | $1,175 | +6.6% |
| 2008 | $1,268 | +7.9% |
| 2009 | $1,306 | +3.0% |
| 2010 | $1,389 | +6.4% |
| 2011 | $1,496 | +7.7% |
| 2012 | $1,552 | +3.8% |
| 2013 | $1,516 | -2.3% |
| 2014 | $1,607 | +6.0% |
| 2015 | $1,615 | +0.5% |
| 2016 | $1,654 | +2.4% |
| 2017 | $1,712 | +3.6% |
| 2018 | $1,724 | +0.7% |
| 2019 | $1,870 | +8.5% |
| 2020 | $2,010 | +7.5% |
| 2021 | $1,974 | -1.8% |
| 2022 | $1,717 | -13.0% |
| 2023 | $1,814 | +5.7% |
| 2024 | $1,838 | +1.3% |
| 2025 | $1,970 | +7.2% |
| 2026 | $1,968 | -0.1% |
Best and worst month-end to buy
The best single month-end close to have bought AGG was 2003-10 ($49.05): $1,000 then is $1,994 today. The worst was 2020-07 ($100): $1,000 then is $977.
FAQ
What would $1,000 in AGG be worth today?
A $1,000 investment in iShares Core U.S. Aggregate Bond ETF (AGG) at the start of 2003 would be worth about $1,976 today, a total return of +97.6%. Dividends are reinvested in these figures.
What were the best and worst years for AGG?
iShares Core U.S. Aggregate Bond ETF (AGG)'s strongest calendar year since 2003 was 2019, a +8.5% return — $1,000 held through that year became about $1,085 by year-end. Its weakest year was 2022, at -13.0%.
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 AGG have grown?
Investing $100 at the end of every month since 2003-09 would have grown to about $36,782 on $27,600 invested.
Did AGG beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $7,739. AGG trailed the S&P 500 by +74.5% in total return.
Is this investment advice?
No. What If I'd Held is an entertainment and education tool. Every number is a historical calculation, not a prediction, and past performance never guarantees future results.
Methodology
iShares Core U.S. Aggregate Bond ETF (AGG) historical total-return data from 2003-09 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. What If I'd Held is entertainment, not investment advice.
What if you'd held…
Data: adjusted close prices via Yahoo Finance. As of 2026-08. Not financial advice.