What if you'd held WLK?
A $1,000 investment in Westlake Corporation (WLK) at the month-end close of 2004-08 would be worth $11,577 at the close of 2026-09 — +1057.7% total return, dividends reinvested. The same $1,000 in the S&P 500, dividends reinvested, would be worth $10,614.
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 2026-09, dividends included.
Every year, $1,000 from 2004
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2004 | $1,000 | — |
| 2005 | $866 | -13.4% |
| 2006 | $947 | +9.4% |
| 2007 | $577 | -39.0% |
| 2008 | $501 | -13.2% |
| 2009 | $776 | +54.8% |
| 2010 | $1,365 | +76.0% |
| 2011 | $1,271 | -6.9% |
| 2012 | $2,658 | +109.1% |
| 2013 | $4,126 | +55.2% |
| 2014 | $4,162 | +0.9% |
| 2015 | $3,743 | -10.1% |
| 2016 | $3,919 | +4.7% |
| 2017 | $7,540 | +92.4% |
| 2018 | $4,730 | -37.3% |
| 2019 | $5,096 | +7.7% |
| 2020 | $6,039 | +18.5% |
| 2021 | $7,279 | +20.5% |
| 2022 | $7,775 | +6.8% |
| 2023 | $10,760 | +38.4% |
| 2024 | $8,941 | -16.9% |
| 2025 | $5,921 | -33.8% |
| 2026 | $6,056 | +2.3% |
Best and worst month-end to buy
The best single month-end close to have bought WLK was 2009-02 ($4.74): $1,000 then is $15,778 today. The worst was 2024-05 ($153): $1,000 then is $487.
FAQ
What would $1,000 in WLK be worth today?
A $1,000 investment in Westlake Corporation (WLK) at the start of 2004 would be worth about $11,577 today, a total return of +1057.7%. Dividends are reinvested in these figures.
What were the best and worst years for WLK?
Westlake Corporation (WLK)'s strongest calendar year since 2004 was 2012, a +109.1% return — $1,000 held through that year became about $2,091 by year-end. Its weakest year was 2007, at -39.0%.
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 WLK have grown?
Investing $100 at the end of every month since 2004-08 would have grown to about $92,024 on $26,600 invested.
Did WLK beat the S&P 500?
Over the same period, $1,000 in the S&P 500 with dividends reinvested (the S&P 500 Total Return index) would be worth $10,614. WLK beat the S&P 500 by +9.1% 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
Westlake Corporation (WLK) historical total-return data from 2004-08 to 2026-09, reduced to month-end closes for the tables above.
Returns use adjusted close prices — adjusted for stock splits and reinvested dividends, the same convention used by major brokerages. End-of-day and live prices come from EODHD; parts of the deep historical series are carried over from Yahoo Finance data. 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 (EODHD): 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 EODHD and Yahoo Finance. As of 2026-09-04. Not financial advice.