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 — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$87.34$87.34615,700
2025-12-30$87.26$87.26344,000
2025-12-29$87.93$87.93373,100
2025-12-26$88.78$88.78390,100
2025-12-24$88.84$88.84154,100
2025-12-23$88.73$88.73329,100
2025-12-22$87.41$87.41661,100
2025-12-19$86.05$86.051,736,500
2025-12-18$85.79$85.792,227,500
2025-12-17$89.34$89.34821,600
2025-12-16$91.54$91.54881,100
2025-12-15$94.79$94.79960,000
2025-12-12$95.35$95.351,286,800
2025-12-11$92.25$92.25800,700
2025-12-10$91.38$91.381,308,400
2025-12-09$88.56$88.561,440,000
2025-12-08$90.25$90.251,455,800
2025-12-05$89.65$89.651,473,100
2025-12-04$87.33$87.33736,800
2025-12-03$86.07$86.07715,200
2025-12-02$84.65$84.65992,800
2025-12-01$85.64$85.64999,700
2025-11-28$90.00$90.00337,400
2025-11-26$90.07$90.071,205,200
2025-11-25$89.86$89.86910,900
2025-11-24$87.69$87.69872,400
2025-11-21$85.40$85.40907,100
2025-11-20$84.20$84.20789,500
2025-11-19$85.13$85.13989,300
2025-11-18$84.39$84.39778,800
2025-11-17$84.77$84.77794,800
2025-11-14$84.61$84.61755,300
2025-11-13$83.24$83.24711,800
2025-11-12$84.85$84.851,361,100
2025-11-11$85.56$85.56952,400
2025-11-10$83.23$83.231,161,400
2025-11-07$79.54$79.54882,300
2025-11-06$79.78$79.781,139,600
2025-11-05$77.88$77.88622,900
2025-11-04$76.50$76.501,029,000
2025-11-03$75.95$75.951,041,500
2025-10-31$78.62$78.62725,800
2025-10-30$77.85$77.85839,200
2025-10-29$76.69$76.69921,200
2025-10-28$78.51$78.511,246,000
2025-10-27$75.25$75.25938,400
2025-10-24$74.86$74.86690,700
2025-10-23$73.99$73.99722,500
2025-10-22$73.50$73.50885,800
2025-10-21$75.00$75.00929,900
2025-10-20$76.72$76.72780,600
2025-10-17$77.50$77.501,240,900
2025-10-16$75.73$75.731,931,600
2025-10-15$77.68$77.681,149,600
2025-10-14$76.94$76.941,885,900
2025-10-13$79.17$79.175,941,400
2025-10-10$87.00$87.007,065,300
2025-10-09$67.04$67.041,058,900
2025-10-08$65.30$65.30587,500
2025-10-07$65.47$65.47804,400
2025-10-06$64.14$64.14886,200
2025-10-03$64.83$64.83623,600
2025-10-02$64.98$64.98575,500
2025-10-01$64.00$64.001,048,500
2025-09-30$66.43$66.431,446,200
2025-09-29$65.14$65.142,017,900
2025-09-26$67.42$67.421,424,200
2025-09-25$64.70$64.70806,400
2025-09-24$65.95$65.95857,000
2025-09-23$65.06$65.06568,700
2025-09-22$64.51$64.51702,600
2025-09-19$62.20$62.202,461,700
2025-09-18$62.14$62.141,358,100
2025-09-17$59.22$59.22912,800
2025-09-16$58.59$58.59633,900
2025-09-15$58.38$58.38929,200
2025-09-12$58.86$58.86685,800
2025-09-11$59.68$59.68939,400
2025-09-10$57.74$57.74843,200
2025-09-09$58.36$58.361,483,300
2025-09-08$56.19$56.191,643,300
2025-09-05$60.53$60.531,926,600
2025-09-04$59.60$59.601,473,800
2025-09-03$58.11$58.111,018,800
2025-09-02$58.85$58.85665,800
2025-08-29$59.05$59.05792,300
2025-08-28$58.14$58.141,003,800
2025-08-27$61.43$61.431,426,800
2025-08-26$56.99$56.99516,400
2025-08-25$56.88$56.88545,000
2025-08-22$57.48$57.48470,100
2025-08-21$56.04$56.04500,900
2025-08-20$56.23$56.23675,200
2025-08-19$56.25$56.25528,400
2025-08-18$56.21$56.21470,800
2025-08-15$56.07$56.07471,900
2025-08-14$54.99$54.99629,400
2025-08-13$56.72$56.72999,400
2025-08-12$54.53$54.53541,700
2025-08-11$53.75$53.75866,500
2025-08-08$51.07$51.07719,200
2025-08-07$50.96$50.96901,700
2025-08-06$53.87$53.87449,100
2025-08-05$53.90$53.90460,700
2025-08-04$53.83$53.83374,000
2025-08-01$53.83$53.83600,800
2025-07-31$53.86$53.86561,100
2025-07-30$54.62$54.62388,800
2025-07-29$55.01$55.01802,700
2025-07-28$56.26$56.26681,200
2025-07-25$55.15$55.15491,000
2025-07-24$53.74$53.74695,900
2025-07-23$54.19$54.191,310,800
2025-07-22$54.99$54.99695,000
2025-07-21$55.22$55.22451,600
2025-07-18$55.48$55.48471,100
2025-07-17$56.44$56.44703,800
2025-07-16$56.64$56.64614,000
2025-07-15$55.32$55.32603,600
2025-07-14$55.23$55.23796,500
2025-07-11$53.00$53.00766,100
2025-07-10$52.83$52.83654,900
2025-07-09$52.29$52.29665,100
2025-07-08$49.70$49.70591,600
2025-07-07$49.87$49.87771,700
2025-07-03$51.05$51.05339,500
2025-07-02$50.69$50.691,219,400
2025-07-01$50.21$50.211,509,000
2025-06-30$55.27$55.27912,300
2025-06-27$55.69$55.691,547,500
2025-06-26$55.22$55.22838,900
2025-06-25$54.44$54.44900,200
2025-06-24$53.68$53.68635,200
2025-06-23$53.36$53.36550,100
2025-06-20$53.34$53.342,294,200
2025-06-18$53.92$53.92918,400
2025-06-17$55.21$55.211,270,400
2025-06-16$54.66$54.66811,700
2025-06-13$56.37$56.37987,500
2025-06-12$56.32$56.32800,600
2025-06-11$55.34$55.34677,200
2025-06-10$56.37$56.371,269,600
2025-06-09$55.68$55.681,121,200
2025-06-06$54.38$54.381,073,500
2025-06-05$53.82$53.82947,100
2025-06-04$51.53$51.53693,300
2025-06-03$51.06$51.061,467,600
2025-06-02$50.15$50.151,275,100
2025-05-30$47.47$47.47787,400
2025-05-29$47.58$47.58688,500
2025-05-28$45.75$45.75665,000
2025-05-27$46.43$46.43850,600
2025-05-23$45.66$45.66486,200
2025-05-22$45.91$45.91901,600
2025-05-21$45.82$45.82832,200
2025-05-20$46.61$46.61535,200
2025-05-19$45.57$45.57551,800
2025-05-16$44.49$44.49647,000
2025-05-15$44.41$44.41625,800
2025-05-14$43.77$43.77840,100
2025-05-13$44.27$44.27910,100
2025-05-12$45.27$45.271,000,800
2025-05-09$42.97$42.97671,200
2025-05-08$43.92$43.921,100,700
2025-05-07$43.09$43.091,360,400
2025-05-06$42.01$42.01807,800
2025-05-05$44.28$44.28876,700
2025-05-02$45.51$45.51644,100
2025-05-01$44.99$44.99739,500
2025-04-30$45.82$45.82860,800
2025-04-29$45.62$45.621,254,800
2025-04-28$44.39$44.39592,400
2025-04-25$44.49$44.49634,300
2025-04-24$44.85$44.85859,900
2025-04-23$46.16$46.161,416,200
2025-04-22$45.85$45.85774,800
2025-04-21$45.80$45.801,189,700
2025-04-17$46.28$46.28517,400
2025-04-16$45.80$45.801,329,900
2025-04-15$46.95$46.952,147,600
2025-04-14$45.03$45.031,162,800
2025-04-11$42.62$42.621,157,700
2025-04-10$40.89$40.891,638,900
2025-04-09$42.57$42.571,868,900
2025-04-08$41.67$41.672,073,400
2025-04-07$43.21$43.211,590,200
2025-04-04$44.44$44.441,749,600
2025-04-03$46.50$46.501,482,000
2025-04-02$48.20$48.201,223,100
2025-04-01$46.88$46.881,095,300
2025-03-31$48.36$48.361,211,800
2025-03-28$48.88$48.88664,500
2025-03-27$49.44$49.44715,400
2025-03-26$49.56$49.56881,900
2025-03-25$51.05$51.05790,400
2025-03-24$52.53$52.531,521,900
2025-03-21$52.65$52.653,695,700
2025-03-20$53.05$53.05890,900
2025-03-19$54.35$54.351,048,600
2025-03-18$54.52$54.52784,600
2025-03-17$53.01$53.011,284,600
2025-03-14$54.78$54.781,271,500
2025-03-13$54.90$54.901,399,200
2025-03-12$57.65$57.652,252,400
2025-03-11$59.76$59.762,617,900
2025-03-10$55.95$55.955,227,800
2025-03-07$38.35$38.351,598,900
2025-03-06$39.05$39.051,033,300
2025-03-05$38.45$38.451,509,600
2025-03-04$38.66$38.661,623,000
2025-03-03$38.50$38.502,396,000
2025-02-28$37.59$37.59720,400
2025-02-27$36.34$36.34999,000
2025-02-26$36.15$36.151,024,900
2025-02-25$35.09$35.091,614,800
2025-02-24$36.00$36.001,143,000
2025-02-21$38.75$38.75659,600
2025-02-20$38.49$38.49618,700
2025-02-19$38.53$38.53456,600
2025-02-18$37.75$37.75496,400
2025-02-14$38.67$38.67368,300
2025-02-13$38.68$38.68371,700
2025-02-12$37.42$37.42421,700
2025-02-11$36.99$36.99908,000
2025-02-10$37.99$37.99704,300
2025-02-07$38.88$38.88756,800
2025-02-06$37.75$37.75528,200
2025-02-05$38.52$38.52552,600
2025-02-04$37.58$37.58466,700
2025-02-03$37.20$37.20491,900
2025-01-31$37.80$37.80624,300
2025-01-30$39.12$39.12333,500
2025-01-29$38.21$38.21327,400
2025-01-28$37.99$37.99466,000
2025-01-27$38.36$38.36587,800
2025-01-24$37.69$37.69431,200
2025-01-23$37.80$37.80525,000
2025-01-22$36.88$36.88610,900
2025-01-21$38.10$38.10461,100
2025-01-17$36.82$36.82485,300
2025-01-16$36.54$36.54672,700
2025-01-15$37.94$37.94699,300
2025-01-14$36.67$36.67439,200
2025-01-13$37.14$37.14623,900
2025-01-10$36.61$36.61493,200
2025-01-08$37.62$37.62670,600
2025-01-07$38.45$38.451,060,400
2025-01-06$38.09$38.09747,300
2025-01-03$39.57$39.57375,200
2025-01-02$38.98$38.98468,000