What if you'd held PTGX?
A $1,000 investment in Protagonist Therapeutics, Inc. (PTGX) at the month-end close of 2016-08 would be worth $12,901 at the close of 2026-08 — +1190.1% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $3,551.
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 2016
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2016 | $1,000 | — |
| 2017 | $946 | -5.4% |
| 2018 | $306 | -67.6% |
| 2019 | $321 | +4.8% |
| 2020 | $917 | +186.0% |
| 2021 | $1,555 | +69.6% |
| 2022 | $496 | -68.1% |
| 2023 | $1,043 | +110.2% |
| 2024 | $1,755 | +68.3% |
| 2025 | $3,972 | +126.3% |
| 2026 | $7,046 | +77.4% |
Best and worst month-end to buy
The best single month-end close to have bought PTGX was 2018-11 ($6.47): $1,000 then is $23,947 today. The worst was 2026-08 ($155): $1,000 then is $1,000.
FAQ
What would $1,000 in PTGX be worth today?
A $1,000 investment in Protagonist Therapeutics, Inc. (PTGX) at the start of 2016 would be worth about $12,901 today, a total return of +1190.1%. Dividends are reinvested in these figures.
What were the best and worst years for PTGX?
Protagonist Therapeutics, Inc. (PTGX)'s strongest calendar year since 2016 was 2020, a +186.0% return — $1,000 held through that year became about $2,860 by year-end. Its weakest year was 2022, at -68.1%.
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 PTGX have grown?
Investing $100 at the end of every month since 2016-08 would have grown to about $116,135 on $12,100 invested.
Did PTGX beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $3,551. PTGX beat the S&P 500 by +263.4% 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
Protagonist Therapeutics, Inc. (PTGX) historical total-return data from 2016-08 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.