What if you'd held MKSI?
A $1,000 investment in MKS Inc. (MKSI) at the month-end close of 1999-03 would be worth $25,693 at the close of 2026-08 — +2469.3% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $5,992.
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 1999
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1999 | $1,000 | — |
| 2000 | $429 | -57.1% |
| 2001 | $748 | +74.3% |
| 2002 | $455 | -39.2% |
| 2003 | $803 | +76.5% |
| 2004 | $514 | -36.0% |
| 2005 | $495 | -3.6% |
| 2006 | $625 | +26.2% |
| 2007 | $530 | -15.2% |
| 2008 | $410 | -22.7% |
| 2009 | $482 | +17.6% |
| 2010 | $678 | +40.8% |
| 2011 | $788 | +16.2% |
| 2012 | $748 | -5.1% |
| 2013 | $888 | +18.8% |
| 2014 | $1,109 | +24.9% |
| 2015 | $1,112 | +0.2% |
| 2016 | $1,865 | +67.7% |
| 2017 | $2,993 | +60.5% |
| 2018 | $2,063 | -31.1% |
| 2019 | $3,546 | +71.9% |
| 2020 | $4,883 | +37.7% |
| 2021 | $5,683 | +16.4% |
| 2022 | $2,786 | -51.0% |
| 2023 | $3,417 | +22.6% |
| 2024 | $3,492 | +2.2% |
| 2025 | $5,391 | +54.4% |
| 2026 | $9,517 | +76.5% |
Best and worst month-end to buy
The best single month-end close to have bought MKSI was 2002-09 ($8.95): $1,000 then is $31,464 today. The worst was 2026-06 ($445): $1,000 then is $633.
FAQ
What would $1,000 in MKSI be worth today?
A $1,000 investment in MKS Inc. (MKSI) at the start of 1999 would be worth about $25,693 today, a total return of +2469.3%. Dividends are reinvested in these figures.
What were the best and worst years for MKSI?
MKS Inc. (MKSI)'s strongest calendar year since 1999 was 2003, a +76.5% return — $1,000 held through that year became about $1,765 by year-end. Its weakest year was 2000, at -57.1%.
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 MKSI have grown?
Investing $100 at the end of every month since 1999-03 would have grown to about $354,988 on $33,000 invested.
Did MKSI beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $5,992. MKSI beat the S&P 500 by +328.8% 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
MKS Inc. (MKSI) historical total-return data from 1999-03 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.