NASDAQ:PTGX

Protagonist Therapeutics Stock Price (Quote)

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$112.86
+1.42 (+1.27%)
At Close: Jun 18, 2026

Range Low Price High Price Comment
30 days $92.83 $114.48 Thursday, 18th Jun 2026 PTGX stock ended at $112.86. This is 1.27% more than the trading day before Wednesday, 17th Jun 2026. During the day the stock fluctuated 2.87% from a day low at $111.29 to a day high of $114.48.
90 days $92.83 $114.48
52 weeks $49.39 $114.48

Historical Protagonist Therapeutics Inc prices

Date Open High Low Close Volume
Jun 18, 2026 $112.88 $114.48 $111.29 $112.86 1 524 436
Jun 17, 2026 $110.84 $113.47 $110.20 $111.44 685 665
Jun 16, 2026 $112.83 $113.66 $108.53 $110.64 326 557
Jun 15, 2026 $109.91 $112.77 $109.81 $112.46 442 963
Jun 12, 2026 $109.85 $111.78 $109.60 $109.78 440 226
Jun 11, 2026 $106.28 $110.82 $106.28 $109.79 535 247
Jun 10, 2026 $105.17 $111.45 $104.89 $105.77 767 021
Jun 09, 2026 $99.04 $106.48 $98.08 $105.87 861 847
Jun 08, 2026 $98.95 $101.16 $96.70 $98.03 548 300
Jun 05, 2026 $103.14 $103.29 $96.38 $97.38 887 400
Jun 04, 2026 $96.39 $103.55 $96.14 $102.79 658 834
Jun 03, 2026 $93.93 $95.61 $93.00 $95.41 554 292
Jun 02, 2026 $93.84 $97.71 $92.83 $93.23 711 238
Jun 01, 2026 $97.85 $98.32 $93.50 $94.92 815 318
May 29, 2026 $100.64 $102.40 $98.84 $99.56 540 522
May 28, 2026 $102.63 $103.71 $99.43 $100.41 517 155
May 27, 2026 $100.05 $102.49 $98.94 $102.21 389 997
May 26, 2026 $100.03 $100.79 $97.93 $99.98 339 452
May 22, 2026 $102.01 $102.42 $99.13 $99.19 360 762
May 21, 2026 $101.13 $103.43 $98.60 $102.01 385 743
May 20, 2026 $100.42 $101.90 $98.37 $100.88 360 969
May 19, 2026 $100.38 $100.38 $96.92 $98.37 485 534
May 18, 2026 $103.22 $104.16 $100.60 $100.74 431 140
May 15, 2026 $103.95 $104.39 $101.72 $102.18 560 751
May 14, 2026 $104.30 $105.72 $101.67 $105.55 407 143

FAQ

What are historical stock prices?
Historical stock prices refer to a stock’s recorded prices at various past points. These prices include several key figures that help investors and analysts evaluate a stock’s performance over time:
Open: Open price for the trading day.
High: Highest price for the trading day.
Low: Lowest price for the trading day.
Close: Close price for the trading day.

Additionally, historical prices often include:
Volume is the number of shares traded during the day. It indicates how actively a stock was traded and can provide insights into market sentiment and liquidity.

How can I use PTGX stock historical prices to predict future price movements?
Trend Analysis: Examine the PTGX stock’s historical trends to identify patterns that might continue.
Moving Averages: Use moving averages to detect potential reversal points.
Momentum Indicators: Apply indicators like RSI or MACD to assess the momentum and strength of price movements.
Volume Analysis: Analyze trading volume alongside price changes to gauge trend strength.
Statistical Methods: Use statistical tools such as regression analysis to model and forecast future prices based on past data.
These techniques can provide insights but should be used with risk management practices to mitigate potential losses.

What impact do stock splits have on historical price data?
When a company performs a stock split, it adjusts the historical price data to reflect the new, lower trading price as if it had always been that way.

This ensures consistency for anyone analyzing the stock’s past prices. The adjustment helps prevent misleading signals on charts, such as false sell signals or bearish trends that aren’t there. For instance, in a 2-for-1 stock split, the price per share is cut in half, which would otherwise appear as a dramatic drop on the chart. If someone didn’t know about the split, they might wrongly think something negative happened to the company. Most technical indicators would also react to this apparent drop by signaling to sell.

A stock split, while making the shares seem more affordable and potentially more attractive to investors, doesn’t alter the company’s fundamental value.

Why do the PTGX stock historical prices show a range for periods like 30 days, 90 days, and 52 weeks?
The range provides the lowest and highest prices at which the stock has traded during the specified period. This helps investors understand the stock’s volatility and price variability within that timeframe.

How can I use historical price volatility to assess risk?
High price volatility historically indicates higher risk and potentially higher returns. Investors can gauge the stock’s risk level by examining the range between high and low prices over various periods.
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ABOUT PROTAGONIST THERAPEUTICS INC
Protagonist Therapeutics
Protagonist Therapeutics, Inc., a biopharmaceutical company, discovers and develops peptide-based therapeutic drugs to address hematology and blood disorders, and inflammatory and immunomodulatory diseases. It is developing rusfertide (PTG-300), an injectable hepcidin mimetic that is in Phase II clinical trials for the treatment of patients with polycythemia vera and hereditary hemochromatosis, as well as for the treatment of other blood disorder...
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