What if you'd held NPKI?
A $1,000 investment in NPK International Inc. (NPKI) at the month-end close of 1990-09 would be worth $11,807 at the close of 2026-08 — +1080.7% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $25,185.
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 1990
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1990 | $1,000 | — |
| 1991 | $1,723 | +72.3% |
| 1992 | $2,501 | +45.2% |
| 1993 | $2,001 | -20.0% |
| 1994 | $5,335 | +166.6% |
| 1995 | $5,194 | -2.6% |
| 1996 | $8,696 | +67.4% |
| 1997 | $16,340 | +87.9% |
| 1998 | $6,361 | -61.1% |
| 1999 | $5,719 | -10.1% |
| 2000 | $8,929 | +56.1% |
| 2001 | $7,376 | -17.4% |
| 2002 | $4,062 | -44.9% |
| 2003 | $4,472 | +10.1% |
| 2004 | $4,809 | +7.5% |
| 2005 | $7,124 | +48.2% |
| 2006 | $6,732 | -5.5% |
| 2007 | $5,089 | -24.4% |
| 2008 | $3,455 | -32.1% |
| 2009 | $3,950 | +14.3% |
| 2010 | $5,752 | +45.6% |
| 2011 | $8,870 | +54.2% |
| 2012 | $7,330 | -17.4% |
| 2013 | $11,475 | +56.6% |
| 2014 | $8,908 | -22.4% |
| 2015 | $4,930 | -44.7% |
| 2016 | $7,003 | +42.0% |
| 2017 | $8,030 | +14.7% |
| 2018 | $6,415 | -20.1% |
| 2019 | $5,854 | -8.7% |
| 2020 | $1,793 | -69.4% |
| 2021 | $2,745 | +53.1% |
| 2022 | $3,875 | +41.2% |
| 2023 | $6,200 | +60.0% |
| 2024 | $7,162 | +15.5% |
| 2025 | $11,130 | +55.4% |
| 2026 | $13,119 | +17.9% |
Best and worst month-end to buy
The best single month-end close to have bought NPKI was 2020-10 ($0.72): $1,000 then is $19,514 today. The worst was 1998-04 ($24.06): $1,000 then is $584.
FAQ
What would $1,000 in NPKI be worth today?
A $1,000 investment in NPK International Inc. (NPKI) at the start of 1990 would be worth about $11,807 today, a total return of +1080.7%. Dividends are reinvested in these figures.
What were the best and worst years for NPKI?
NPK International Inc. (NPKI)'s strongest calendar year since 1990 was 1994, a +166.6% return — $1,000 held through that year became about $2,666 by year-end. Its weakest year was 2020, at -69.4%.
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 NPKI have grown?
Investing $100 at the end of every month since 1990-09 would have grown to about $128,114 on $43,200 invested.
Did NPKI beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $25,185. NPKI trailed the S&P 500 by +53.1% 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
NPK International Inc. (NPKI) historical total-return data from 1990-09 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. 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.