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Protagonist Therapeutics, Inc (PTGX) stock

PTGXNasdaqPharmaceutical PreparationsFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 5, 2026Score 12/30299% above fair value
$144.85+0.51 (+0.35%)

Close on Oct 30, 2026Market cap $9.37BP/E 140.6Yield –

Price history

Protagonist Therapeutics share prices for every week, newest first. Adjusted for stock splits, not for dividends.

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Close, Oct 30, 2026
$144.85
+0.35% on the day
52-week range
$75.44 – $160.81
-9.9% from the high
Change over 52 weeks
+86.1%
From $77.85 on Oct 30, 2025
Average volume
682,974
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 26, 2026$139.24$146.44$137.30$144.85+4.64%2,655,783
Oct 19, 2026$130.09$141.85$128.01$138.43+7.52%3,232,579
Oct 12, 2026$145.83$152.19$126.39$128.75-10.42%4,204,000
Oct 5, 2026$139.96$146.30$136.09$143.73+2.62%4,599,953
Sep 28, 2026$142.21$144.09$138.37$140.06-1.27%3,867,681
Sep 21, 2026$143.22$147.71$134.10$141.86-0.80%3,940,117
Sep 14, 2026$150.23$151.24$140.44$143.00-3.50%4,148,955
Sep 8, 2026$143.61$151.19$142.00$148.18+1.69%2,251,827
Aug 31, 2026$143.26$150.34$141.95$145.72+0.96%2,518,647
Aug 24, 2026$154.32$158.08$142.43$144.33-6.47%2,366,167
Aug 17, 2026$155.11$160.81$148.28$154.32-0.50%2,685,762
Aug 10, 2026$149.31$155.53$147.33$155.10+6.33%2,140,795
Aug 3, 2026$135.78$148.00$131.68$145.87+6.75%2,675,080
Jul 27, 2026$136.11$139.92$130.63$136.64+0.39%2,364,973
Jul 20, 2026$141.79$143.29$131.05$136.11-3.41%2,957,930
Jul 13, 2026$130.05$141.08$125.32$140.91+7.22%3,063,334
Jul 6, 2026$131.25$141.10$128.15$131.42-0.15%5,620,009
Jun 29, 2026$121.34$131.87$118.27$131.62+7.99%2,532,142
Jun 22, 2026$113.24$126.25$113.24$121.88+7.99%6,668,522
Jun 15, 2026$109.10$114.49$108.53$112.86+2.81%3,317,301
Jun 8, 2026$98.95$111.78$96.70$109.78+12.73%3,229,909
Jun 1, 2026$97.88$103.55$92.75$97.38-2.19%3,666,082
May 26, 2026$100.03$103.71$97.93$99.56+0.37%1,914,845
May 18, 2026$103.22$104.16$96.69$99.19-2.93%2,108,448
May 11, 2026$100.14$105.72$98.22$102.18+2.84%2,723,238
May 4, 2026$98.00$105.03$97.00$99.36+1.01%3,187,181
Apr 27, 2026$100.44$103.42$97.08$98.37-1.63%3,260,184
Apr 20, 2026$105.47$107.00$98.91$100.00-5.64%2,811,653
Apr 13, 2026$98.61$106.90$95.40$105.98+7.25%4,132,326
Apr 6, 2026$103.72$105.88$98.40$98.82-4.78%3,410,156
Mar 30, 2026$99.04$107.84$98.08$103.78+4.86%3,014,772
Mar 23, 2026$100.00$105.69$97.16$98.97+0.10%4,508,559
Mar 16, 2026$93.28$105.69$90.58$98.87+7.05%7,425,498
Mar 9, 2026$91.14$98.32$90.92$92.36+0.29%4,018,750
Mar 2, 2026$92.08$95.43$87.82$92.09+0.01%3,504,803
Feb 23, 2026$82.32$92.23$77.00$92.08+11.26%3,308,315
Feb 17, 2026$81.07$83.69$80.40$82.76+1.56%1,735,520
Feb 9, 2026$83.47$84.90$80.59$81.49-3.55%1,896,137
Feb 2, 2026$81.80$86.10$80.20$84.49+3.29%4,531,581
Jan 26, 2026$82.53$84.32$77.70$81.80-1.56%3,940,994
Jan 20, 2026$81.16$85.50$79.87$83.10+1.35%3,165,771
Jan 12, 2026$79.49$87.44$78.75$81.99+2.21%4,095,752
Jan 5, 2026$87.53$87.53$79.18$80.22-7.98%5,451,384
Dec 29, 2025$88.66$89.10$85.19$87.18-1.80%2,084,497
Dec 22, 2025$85.33$90.00$84.88$88.78+3.17%1,534,433
Dec 15, 2025$95.41$96.54$84.11$86.05-9.75%6,626,904
Dec 8, 2025$90.94$95.39$88.30$95.35+6.36%6,292,232
Dec 1, 2025$89.61$90.18$83.52$89.65-0.39%4,918,066
Nov 24, 2025$86.59$90.85$85.71$90.00+5.39%3,325,988
Nov 17, 2025$82.79$86.95$82.79$85.40+0.93%4,259,838
Nov 10, 2025$80.58$86.90$79.56$84.61+6.37%4,942,549
Nov 3, 2025$78.62$80.75$75.44$79.54+1.17%4,715,540

Seasonality

PTGX return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average3.1%0.5%7.8%-11.9%18.6%10.7%1.4%15.4%-7.5%5.3%4.9%2.9%
Months up6 of 105 of 105 of 102 of 107 of 108 of 106 of 108 of 104 of 105 of 105 of 95 of 9
2026-6.3%12.6%14.5%-6.1%0.6%23.1%11.5%8.1%-4.6%2.8%
2025-2.1%-0.6%28.7%-5.3%3.6%16.4%-2.6%9.6%12.5%18.4%14.5%-3.0%
20249.1%21.5%-4.8%-13.2%12.1%23.1%8.1%14.6%4.9%1.9%-4.5%-11.9%
202321.8%22.0%41.8%-1.7%15.4%5.9%-29.8%2.2%-15.8%-12.8%25.2%25.9%
2022-14.4%-17.1%-2.5%-61.6%-3.6%-9.7%25.8%-12.4%-3.3%-3.9%-2.3%37.9%
20212.7%13.8%9.9%11.7%21.3%27.8%10.1%-1.9%-63.5%75.8%7.9%1.7%
20207.1%3.3%-9.5%-4.4%144.9%6.8%-10.9%42.4%-12.7%-3.1%27.5%-16.6%
201921.1%-1.6%56.7%-17.8%-2.6%20.4%-9.0%18.2%-7.8%12.0%-35.3%-19.0%
20189.9%-25.9%-49.3%0.6%-15.7%-7.7%3.0%39.2%6.9%-22.4%-19.0%4.0%
2017-18.0%-23.2%-7.6%-21.0%10.4%1.3%7.8%34.0%8.2%-15.3%30.3%6.7%