What if you'd held CSGP?
A $1,000 investment in CoStar Group, Inc. (CSGP) at the month-end close of 1998-07 would be worth $31,377 at the close of 2026-08 — +3037.7% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $6,878.
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 1998
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1998 | $1,000 | — |
| 1999 | $2,841 | +184.1% |
| 2000 | $1,870 | -34.2% |
| 2001 | $1,901 | +1.7% |
| 2002 | $1,461 | -23.2% |
| 2003 | $3,302 | +126.0% |
| 2004 | $3,656 | +10.7% |
| 2005 | $3,418 | -6.5% |
| 2006 | $4,241 | +24.1% |
| 2007 | $3,741 | -11.8% |
| 2008 | $2,608 | -30.3% |
| 2009 | $3,307 | +26.8% |
| 2010 | $4,557 | +37.8% |
| 2011 | $5,283 | +15.9% |
| 2012 | $7,076 | +33.9% |
| 2013 | $14,614 | +106.5% |
| 2014 | $14,539 | -0.5% |
| 2015 | $16,365 | +12.6% |
| 2016 | $14,924 | -8.8% |
| 2017 | $23,511 | +57.5% |
| 2018 | $26,709 | +13.6% |
| 2019 | $47,371 | +77.4% |
| 2020 | $73,181 | +54.5% |
| 2021 | $62,573 | -14.5% |
| 2022 | $61,188 | -2.2% |
| 2023 | $69,192 | +13.1% |
| 2024 | $56,683 | -18.1% |
| 2025 | $53,238 | -6.1% |
| 2026 | $26,706 | -49.8% |
Best and worst month-end to buy
The best single month-end close to have bought CSGP was 1998-08 ($0.66): $1,000 then is $50,875 today. The worst was 2024-03 ($96.60): $1,000 then is $349.
FAQ
What would $1,000 in CSGP be worth today?
A $1,000 investment in CoStar Group, Inc. (CSGP) at the start of 1998 would be worth about $31,377 today, a total return of +3037.7%. Dividends are reinvested in these figures.
What were the best and worst years for CSGP?
CoStar Group, Inc. (CSGP)'s strongest calendar year since 1998 was 1999, a +184.1% return — $1,000 held through that year became about $2,841 by year-end. Its weakest year was 2026, at -49.8%.
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 CSGP have grown?
Investing $100 at the end of every month since 1998-07 would have grown to about $199,344 on $33,800 invested.
Did CSGP beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $6,878. CSGP beat the S&P 500 by +356.2% 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
CoStar Group, Inc. (CSGP) historical total-return data from 1998-07 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.