What if you'd held PROK?
A $1,000 investment in ProKidney Corp. (PROK) at the month-end close of 2021-06 would be worth $146 at the close of 2026-08 — -85.4% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $1,794.
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 2021
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2021 | $1,000 | — |
| 2022 | $693 | -30.7% |
| 2023 | $180 | -74.1% |
| 2024 | $171 | -5.1% |
| 2025 | $226 | +32.5% |
| 2026 | $149 | -33.9% |
Best and worst month-end to buy
The best single month-end close to have bought PROK was 2025-06 ($0.59): $1,000 then is $2,500 today. The worst was 2023-07 ($12.82): $1,000 then is $115.
FAQ
What would $1,000 in PROK be worth today?
A $1,000 investment in ProKidney Corp. (PROK) at the start of 2021 would be worth about $146 today, a total return of -85.4%. Dividends are reinvested in these figures.
What were the best and worst years for PROK?
ProKidney Corp. (PROK)'s strongest calendar year since 2021 was 2025, a +32.5% return — $1,000 held through that year became about $1,325 by year-end. Its weakest year was 2023, at -74.1%.
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 PROK have grown?
Investing $100 at the end of every month since 2021-06 would have grown to about $3,630 on $6,300 invested.
Did PROK beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $1,794. PROK trailed the S&P 500 by +91.8% 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
ProKidney Corp. (PROK) historical total-return data from 2021-06 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.