What if you'd held KOSS?
A $1,000 investment in Koss Corporation (KOSS) at the month-end close of 1980-03 would be worth $11,495 at the close of 2026-08 — +1049.5% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $75,502.
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 1980
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1980 | $1,000 | — |
| 1981 | $1,902 | +90.2% |
| 1982 | $1,354 | -28.8% |
| 1983 | $988 | -27.0% |
| 1984 | $183 | -81.5% |
| 1985 | $329 | +79.9% |
| 1986 | $1,317 | +300.1% |
| 1987 | $1,024 | -22.2% |
| 1988 | $1,134 | +10.7% |
| 1989 | $1,281 | +12.9% |
| 1990 | $512 | -60.0% |
| 1991 | $732 | +42.9% |
| 1992 | $1,537 | +110.0% |
| 1993 | $4,024 | +161.9% |
| 1994 | $3,146 | -21.8% |
| 1995 | $1,756 | -44.2% |
| 1996 | $1,976 | +12.5% |
| 1997 | $3,366 | +70.4% |
| 1998 | $3,219 | -4.4% |
| 1999 | $4,354 | +35.2% |
| 2000 | $7,061 | +62.2% |
| 2001 | $8,479 | +20.1% |
| 2002 | $11,437 | +34.9% |
| 2003 | $13,009 | +13.7% |
| 2004 | $12,555 | -3.5% |
| 2005 | $17,310 | +37.9% |
| 2006 | $16,528 | -4.5% |
| 2007 | $13,537 | -18.1% |
| 2008 | $7,334 | -45.8% |
| 2009 | $9,064 | +23.6% |
| 2010 | $8,608 | -5.0% |
| 2011 | $8,964 | +4.1% |
| 2012 | $8,921 | -0.5% |
| 2013 | $10,046 | +12.6% |
| 2014 | $3,492 | -65.2% |
| 2015 | $3,990 | +14.3% |
| 2016 | $4,549 | +14.0% |
| 2017 | $6,165 | +35.5% |
| 2018 | $3,811 | -38.2% |
| 2019 | $3,073 | -19.4% |
| 2020 | $6,864 | +123.4% |
| 2021 | $21,309 | +210.5% |
| 2022 | $9,876 | -53.7% |
| 2023 | $6,684 | -32.3% |
| 2024 | $14,725 | +120.3% |
| 2025 | $8,260 | -43.9% |
| 2026 | $7,103 | -14.0% |
Best and worst month-end to buy
The best single month-end close to have bought KOSS was 1984-12 ($0.09): $1,000 then is $38,822 today. The worst was 2021-01 ($64.00): $1,000 then is $55.63.
FAQ
What would $1,000 in KOSS be worth today?
A $1,000 investment in Koss Corporation (KOSS) at the start of 1980 would be worth about $11,495 today, a total return of +1049.5%. Dividends are reinvested in these figures.
What were the best and worst years for KOSS?
Koss Corporation (KOSS)'s strongest calendar year since 1980 was 1986, a +300.1% return — $1,000 held through that year became about $4,001 by year-end. Its weakest year was 1984, at -81.5%.
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 KOSS have grown?
Investing $100 at the end of every month since 1980-03 would have grown to about $188,073 on $55,800 invested.
Did KOSS beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $75,502. KOSS trailed the S&P 500 by +84.8% 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
Koss Corporation (KOSS) historical total-return data from 1980-03 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.