NASDAQ:PTGX | Historical Stock Price | Protagonist Therapeutics, Inc

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
2016-08-11 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$5.13$10.24$20.45$40.84$81.56$162.862016-08-112026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

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Historical Stock Price — 2026

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2026-09-04$148.0821,573
2026-09-03$147.5719,561
2026-09-02$148.0132,179
2026-09-01$148.4820,019
2026-08-31$142.7321,528
2026-08-28$146.8131,234
2026-08-27$149.50$149.50381,600$149.8217,325
2026-08-26$151.50$151.50335,500$149.0137,266
2026-08-25$150.59$150.59664,500$155.6427,239
2026-08-24$154.72$154.72483,300$155.5230,994
2026-08-21$154.32$154.32402,500$151.3734,631
2026-08-20$150.69$150.69518,600$153.3922,259
2026-08-19$154.94$154.94785,900$159.9943,831
2026-08-18$157.34$157.34471,600$157.0019,685
2026-08-17$158.62$158.62507,000$155.0114,288
2026-08-14$155.10$155.10426,300$151.2313,926
2026-08-13$151.42$151.42444,800$153.2519,291
2026-08-12$152.01$152.01417,200$148.4020,264
2026-08-11$148.29$148.29306,500$151.3020,256
2026-08-10$150.00$150.00545,800$149.2529,387
2026-08-07$145.87$145.87321,100$147.6114,094
2026-08-06$146.18$146.18837,600$144.1744,717
2026-08-05$137.32$137.32430,500$137.7819,196
2026-08-04$135.81$135.81634,700$133.3627,505
2026-08-03$132.28$132.28451,100$135.9121,916
2026-07-31$136.64$136.64548,800$136.8941,279
2026-07-30$138.64$138.64556,300$133.1726,330
2026-07-29$133.00$133.00560,700$137.6824,070
2026-07-28$136.84$136.84282,400$136.0516,882
2026-07-27$135.56$135.56416,700$136.6719,955
2026-07-24$136.11$136.11298,400$134.9412,315
2026-07-23$135.43$135.43605,800$133.9928,257
2026-07-22$135.44$135.44710,400$139.9433,640
2026-07-21$138.31$138.31580,500$135.3034,705
2026-07-20$134.27$134.27762,600$142.3830,096
2026-07-17$140.91$140.91519,100
2026-07-16$132.02$132.02602,100
2026-07-15$135.46$135.46836,100
2026-07-14$131.27$131.27565,000
2026-07-13$129.89$129.89541,000
2026-07-10$131.42$131.421,060,800
2026-07-09$137.64$137.641,613,300
2026-07-08$140.07$140.07931,400
2026-07-07$140.85$140.851,374,300
2026-07-06$131.50$131.50639,800
2026-07-02$131.62$131.62708,400
2026-07-01$125.17$125.17521,800
2026-06-30$122.58$122.58560,900
2026-06-29$121.63$121.63741,000
2026-06-26$121.88$121.882,593,900
2026-06-25$122.63$122.631,048,000
2026-06-24$122.15$122.151,132,400
2026-06-23$118.96$118.96700,500
2026-06-22$115.03$115.031,193,500
2026-06-18$112.86$112.861,533,700
2026-06-17$111.44$111.44742,500
2026-06-16$110.64$110.64504,800
2026-06-15$112.46$112.46536,300
2026-06-12$109.78$109.78448,900
2026-06-11$109.79$109.79564,100
2026-06-10$105.77$105.77770,500
2026-06-09$105.87$105.87878,600
2026-06-08$98.03$98.03567,700
2026-06-05$97.38$97.38887,400
2026-06-04$102.79$102.79658,800
2026-06-03$95.41$95.41579,200
2026-06-02$93.23$93.23723,600
2026-06-01$94.92$94.92816,600
2026-05-29$99.56$99.56597,800
2026-05-28$100.41$100.41551,500
2026-05-27$102.21$102.21404,800
2026-05-26$99.98$99.98360,700
2026-05-22$99.19$99.19393,900
2026-05-21$102.01$102.01402,900
2026-05-20$100.88$100.88371,700
2026-05-19$98.37$98.37492,700
2026-05-18$100.74$100.74447,200
2026-05-15$102.18$102.18560,800
2026-05-14$105.55$105.55426,500
2026-05-13$103.88$103.88518,200
2026-05-12$99.95$99.95645,700
2026-05-11$103.50$103.50572,000
2026-05-08$99.36$99.36505,000
2026-05-07$98.85$98.85836,900
2026-05-06$103.97$103.97989,900
2026-05-05$99.21$99.21398,000
2026-05-04$99.52$99.52457,400
2026-05-01$98.37$98.37447,700
2026-04-30$98.97$98.97577,600
2026-04-29$98.52$98.52576,700
2026-04-28$101.21$101.21663,200
2026-04-27$98.51$98.51994,900
2026-04-24$100.00$100.00778,700
2026-04-23$102.62$102.62651,600
2026-04-22$105.55$105.55345,900
2026-04-21$105.89$105.89494,900
2026-04-20$105.47$105.47540,500
2026-04-17$105.98$105.981,006,300
2026-04-16$103.73$103.73417,800
2026-04-15$105.44$105.44770,200
2026-04-14$104.72$104.72849,500
2026-04-13$97.57$97.571,088,600
2026-04-10$98.82$98.82577,300
2026-04-09$104.08$104.08699,500
2026-04-08$102.09$102.09819,200
2026-04-07$103.75$103.75785,300
2026-04-06$102.89$102.89528,500
2026-04-02$103.78$103.78601,600
2026-04-01$103.67$103.67583,900
2026-03-31$105.40$105.40944,700
2026-03-30$99.87$99.87884,400
2026-03-27$98.97$98.97785,500
2026-03-26$102.17$102.171,045,300
2026-03-25$104.31$104.31812,200
2026-03-24$100.39$100.39940,200
2026-03-23$98.54$98.54925,400
2026-03-20$98.87$98.872,029,200
2026-03-19$101.68$101.681,919,700
2026-03-18$97.09$97.091,981,500
2026-03-17$97.23$97.23799,200
2026-03-16$96.75$96.75695,800
2026-03-13$92.36$92.36896,000
2026-03-12$95.42$95.42750,600
2026-03-11$96.48$96.48788,700
2026-03-10$97.05$97.05856,000
2026-03-09$96.66$96.66726,800
2026-03-06$92.09$92.09572,400
2026-03-05$91.41$91.41677,500
2026-03-04$94.83$94.83782,700
2026-03-03$91.30$91.30529,500
2026-03-02$94.24$94.24942,700
2026-02-27$92.08$92.08937,000
2026-02-26$88.39$88.39706,000
2026-02-25$87.10$87.10285,800
2026-02-24$87.39$87.39668,500
2026-02-23$86.59$86.59710,800
2026-02-20$82.76$82.76578,000
2026-02-19$83.09$83.09384,600
2026-02-18$82.99$82.99407,900
2026-02-17$82.46$82.46364,700
2026-02-13$81.49$81.49428,900
2026-02-12$81.93$81.93352,500
2026-02-11$83.49$83.49350,200
2026-02-10$83.88$83.88442,600
2026-02-09$83.32$83.32322,000
2026-02-06$84.49$84.49812,800
2026-02-05$80.67$80.67457,100
2026-02-04$83.30$83.301,077,500
2026-02-03$85.59$85.59769,400
2026-02-02$83.05$83.051,414,700
2026-01-30$81.80$81.801,174,000
2026-01-29$79.73$79.73952,700
2026-01-28$81.76$81.76777,200
2026-01-27$83.08$83.08507,800
2026-01-26$82.30$82.30529,200
2026-01-23$83.10$83.10569,300
2026-01-22$84.79$84.79609,100
2026-01-21$83.89$83.891,086,100
2026-01-20$83.42$83.42901,300
2026-01-16$81.99$81.99664,700
2026-01-15$84.75$84.75839,300
2026-01-14$85.23$85.231,052,600
2026-01-13$81.36$81.36799,000
2026-01-12$80.25$80.25739,800
2026-01-09$80.22$80.22983,300
2026-01-08$80.20$80.201,487,700
2026-01-07$82.34$82.341,220,400
2026-01-06$82.27$82.27731,000
2026-01-05$84.18$84.181,028,100
2026-01-02$87.18$87.18751,700