Proteon Therapeutics Inc (PRTO)
NASDAQ
Proteon Therapeutics Inc Stock Price History
Proteon Therapeutics Inc
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Historical daily closing price for Proteon Therapeutics Inc since 2014, adjusted for splits and dividends. The latest closing stock price for Proteon Therapeutics Inc as of June 11, 2026 is 26.82.
- The all-time high Proteon Therapeutics Inc stock closing price was 28.08 on June 2, 2026.
- The Proteon Therapeutics Inc 52-week high stock price is 28.08, which is 4.7% above the current share price.
- The Proteon Therapeutics Inc 52-week low stock price is 0.25, which is 99.1% below the current share price.
- The average Proteon Therapeutics Inc stock price for the last 52 weeks is 6.45.
Annual Close Price
YEAR-END CLOSE · USD
ANNUAL % CHANGE · %
| Year | Average | Year Open | Year High | Year Low | Year Close | Annual % Change |
|---|---|---|---|---|---|---|
| 2026 | 25.47 | 5.30 | 28.08 | 5.01 | 26.82 | +4025.61% |
| 2020 | 0.53 | 0.47 | 0.65 | 0.47 | 0.65 | +58.59% |
| 2019 | 0.99 | 2.46 | 3.75 | 0.25 | 0.41 | -81.94% |
| 2018 | 2.17 | 1.90 | 2.85 | 1.53 | 2.27 | +19.47% |
| 2017 | 1.67 | 1.95 | 2.65 | 1.15 | 1.90 | +0.00% |
| 2016 | 8.06 | 14.04 | 14.04 | 1.85 | 1.90 | -87.75% |
Proteon Therapeutics Inc Stock Price History — FAQ
Proteon Therapeutics Inc (PRTO) stock price history — annual and quarterly figures with year-over-year growth and charts.
Where can I see PRTO's stock price history history?
The chart and table above show Proteon Therapeutics Inc's stock price history by year and by quarter, including the growth rate.