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 — 2020

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2020-12-31$20.16$20.16922,500——
2020-12-30$19.99$19.991,621,400——
2020-12-29$21.37$21.37600,500——
2020-12-28$23.05$23.05566,600——
2020-12-24$23.75$23.75141,000——
2020-12-23$23.90$23.90591,600——
2020-12-22$25.13$25.13651,300——
2020-12-21$23.49$23.49469,500——
2020-12-18$21.12$21.121,335,100——
2020-12-17$20.42$20.42340,000——
2020-12-16$21.71$21.71997,000——
2020-12-15$19.76$19.76590,600——
2020-12-14$20.92$20.92750,700——
2020-12-11$21.52$21.522,400,000——
2020-12-10$21.56$21.56504,800——
2020-12-09$23.44$23.44349,000——
2020-12-08$24.45$24.45225,100——
2020-12-07$22.91$22.91384,600——
2020-12-04$22.41$22.41293,500——
2020-12-03$21.30$21.30235,900——
2020-12-02$21.99$21.99239,400——
2020-12-01$23.17$23.17405,200——
2020-11-30$24.16$24.16704,500——
2020-11-27$23.85$23.85218,500——
2020-11-25$23.13$23.13157,500——
2020-11-24$22.23$22.23325,800——
2020-11-23$22.05$22.05185,100——
2020-11-20$21.73$21.73464,500——
2020-11-19$21.50$21.50266,100——
2020-11-18$22.17$22.171,312,300——
2020-11-17$21.86$21.86380,000——
2020-11-16$21.96$21.96365,400——
2020-11-13$22.21$22.21261,100——
2020-11-12$22.68$22.68407,300——
2020-11-11$22.42$22.42255,400——
2020-11-10$22.51$22.51315,000——
2020-11-09$21.52$21.52289,100——
2020-11-06$21.28$21.28247,500——
2020-11-05$23.05$23.05294,100——
2020-11-04$21.22$21.22463,900——
2020-11-03$20.18$20.18235,500——
2020-11-02$19.50$19.50245,000——
2020-10-30$18.95$18.95322,900——
2020-10-29$18.49$18.49241,800——
2020-10-28$18.50$18.50175,300——
2020-10-27$20.27$20.27209,400——
2020-10-26$19.38$19.38145,900——
2020-10-23$19.95$19.95366,500——
2020-10-22$20.21$20.21198,800——
2020-10-21$19.48$19.48428,600——
2020-10-20$20.13$20.13162,500——
2020-10-19$20.04$20.04165,200——
2020-10-16$20.82$20.82113,200——
2020-10-15$20.52$20.52198,200——
2020-10-14$20.97$20.97129,200——
2020-10-13$21.57$21.57138,000——
2020-10-12$22.06$22.06858,400——
2020-10-09$21.14$21.14131,800——
2020-10-08$21.10$21.10504,400——
2020-10-07$21.44$21.44761,900——
2020-10-06$21.03$21.03591,500——
2020-10-05$21.09$21.09350,900——
2020-10-02$20.51$20.51183,900——
2020-10-01$21.03$21.03480,600——
2020-09-30$19.55$19.55392,300——
2020-09-29$20.25$20.25347,000——
2020-09-28$20.04$20.04203,500——
2020-09-25$19.97$19.97217,800——
2020-09-24$19.43$19.43192,200——
2020-09-23$20.44$20.44490,300——
2020-09-22$21.18$21.18303,900——
2020-09-21$21.08$21.08379,000——
2020-09-18$22.00$22.002,572,700——
2020-09-17$21.18$21.18229,100——
2020-09-16$21.15$21.15353,600——
2020-09-15$21.66$21.66217,600——
2020-09-14$21.54$21.54319,400——
2020-09-11$19.89$19.89234,300——
2020-09-10$21.38$21.38568,300——
2020-09-09$21.83$21.83176,600——
2020-09-08$20.51$20.51195,800——
2020-09-04$20.52$20.52206,600——
2020-09-03$20.87$20.87170,300——
2020-09-02$21.81$21.81173,000——
2020-09-01$20.97$20.97592,700——
2020-08-31$22.40$22.40297,600——
2020-08-28$22.30$22.30271,900——
2020-08-27$21.96$21.96215,900——
2020-08-26$22.15$22.15265,100——
2020-08-25$22.34$22.34295,300——
2020-08-24$21.51$21.51546,000——
2020-08-21$20.98$20.98377,800——
2020-08-20$19.95$19.95305,500——
2020-08-19$19.62$19.62645,900——
2020-08-18$18.22$18.22407,600——
2020-08-17$16.50$16.50250,700——
2020-08-14$15.69$15.691,076,300——
2020-08-13$17.45$17.45115,000——
2020-08-12$17.04$17.04312,400——
2020-08-11$16.96$16.96218,600——
2020-08-10$18.03$18.03187,500——
2020-08-07$17.96$17.96356,800——
2020-08-06$16.45$16.45193,500——
2020-08-05$16.58$16.58278,400——
2020-08-04$16.16$16.16143,600——
2020-08-03$16.49$16.49156,900——
2020-07-31$15.73$15.73336,900——
2020-07-30$16.22$16.22268,000——
2020-07-29$15.64$15.64352,400——
2020-07-28$16.24$16.24224,300——
2020-07-27$15.76$15.76110,300——
2020-07-24$15.48$15.48210,500——
2020-07-23$16.28$16.28162,000——
2020-07-22$16.90$16.90179,600——
2020-07-21$17.24$17.24242,500——
2020-07-20$16.74$16.74263,900——
2020-07-17$16.53$16.53161,600——
2020-07-16$16.37$16.37186,800——
2020-07-15$16.97$16.97260,600——
2020-07-14$15.59$15.59187,400——
2020-07-13$15.19$15.19497,600——
2020-07-10$16.29$16.29312,100——
2020-07-09$17.49$17.49330,300——
2020-07-08$18.64$18.64188,000——
2020-07-07$18.35$18.35281,300——
2020-07-06$18.06$18.06261,200——
2020-07-02$17.75$17.75283,000——
2020-07-01$17.51$17.51264,400——
2020-06-30$17.66$17.66521,400——
2020-06-29$17.39$17.39372,000——
2020-06-26$18.54$18.541,300,300——
2020-06-25$18.84$18.84614,900——
2020-06-24$17.72$17.72472,300——
2020-06-23$17.63$17.63355,300——
2020-06-22$17.18$17.18496,000——
2020-06-19$17.44$17.44643,600——
2020-06-18$17.73$17.731,156,300——
2020-06-17$16.18$16.18232,500——
2020-06-16$16.49$16.49380,900——
2020-06-15$16.10$16.101,003,200——
2020-06-12$16.18$16.18412,900——
2020-06-11$15.61$15.61505,100——
2020-06-10$16.20$16.20339,900——
2020-06-09$16.07$16.07314,300——
2020-06-08$16.24$16.24362,800——
2020-06-05$16.05$16.05473,200——
2020-06-04$16.22$16.22715,200——
2020-06-03$15.50$15.50408,500——
2020-06-02$16.77$16.77790,700——
2020-06-01$16.52$16.52748,600——
2020-05-29$16.53$16.53321,700——
2020-05-28$16.54$16.54786,500——
2020-05-27$16.84$16.84917,500——
2020-05-26$15.90$15.90620,500——
2020-05-22$15.84$15.84437,500——
2020-05-21$16.00$16.00407,400——
2020-05-20$15.38$15.38611,700——
2020-05-19$17.05$17.05545,600——
2020-05-18$16.50$16.501,263,000——
2020-05-15$16.20$16.20775,500——
2020-05-14$16.28$16.28699,400——
2020-05-13$16.07$16.071,020,100——
2020-05-12$16.00$16.003,745,800——
2020-05-11$14.63$14.634,887,300——
2020-05-08$14.20$14.2035,328,400——
2020-05-07$7.73$7.7384,500——
2020-05-06$8.11$8.1194,000——
2020-05-05$8.26$8.26165,000——
2020-05-04$7.62$7.62154,400——
2020-05-01$6.62$6.62111,400——
2020-04-30$6.75$6.75115,000——
2020-04-29$7.11$7.11132,600——
2020-04-28$6.98$6.98168,100——
2020-04-27$6.48$6.48172,800——
2020-04-24$6.51$6.5175,400——
2020-04-23$6.75$6.75138,200——
2020-04-22$6.85$6.85106,100——
2020-04-21$6.59$6.5949,600——
2020-04-20$6.84$6.84108,500——
2020-04-17$7.21$7.21141,900——
2020-04-16$7.11$7.1193,400——
2020-04-15$6.82$6.82147,800——
2020-04-14$7.15$7.15112,300——
2020-04-13$6.98$6.9866,500——
2020-04-09$6.95$6.95119,400——
2020-04-08$6.88$6.88131,800——
2020-04-07$6.47$6.47121,000——
2020-04-06$6.72$6.72137,300——
2020-04-03$6.19$6.19131,900——
2020-04-02$6.25$6.25142,600——
2020-04-01$6.23$6.23172,600——
2020-03-31$7.06$7.06297,800——
2020-03-30$7.17$7.17139,500——
2020-03-27$6.42$6.42140,200——
2020-03-26$6.33$6.33165,000——
2020-03-25$6.20$6.20210,000——
2020-03-24$6.21$6.2195,900——
2020-03-23$6.00$6.00130,900——
2020-03-20$5.65$5.65202,900——
2020-03-19$5.99$5.99185,300——
2020-03-18$5.40$5.40148,800——
2020-03-17$6.70$6.70182,500——
2020-03-16$6.82$6.82196,700——
2020-03-13$7.90$7.90240,900——
2020-03-12$6.68$6.68195,100——
2020-03-11$7.16$7.16392,600——
2020-03-10$7.63$7.63105,500——
2020-03-09$7.52$7.52128,800——
2020-03-06$8.11$8.1189,900——
2020-03-05$8.50$8.50126,800——
2020-03-04$9.03$9.03173,100——
2020-03-03$7.98$7.98128,300——
2020-03-02$7.92$7.92104,700——
2020-02-28$7.80$7.80195,200——
2020-02-27$7.82$7.82313,400——
2020-02-26$8.32$8.32221,100——
2020-02-25$8.56$8.56165,700——
2020-02-24$8.89$8.8978,400——
2020-02-21$9.06$9.06105,200——
2020-02-20$9.22$9.22144,200——
2020-02-19$8.82$8.8291,800——
2020-02-18$8.59$8.59120,900——
2020-02-14$8.35$8.35159,900——
2020-02-13$8.59$8.5988,600——
2020-02-12$8.34$8.34120,000——
2020-02-11$8.38$8.38139,300——
2020-02-10$8.37$8.3778,400——
2020-02-07$8.22$8.22216,400——
2020-02-06$8.38$8.38175,000——
2020-02-05$8.24$8.24128,300——
2020-02-04$7.98$7.98132,900——
2020-02-03$7.87$7.87198,700——
2020-01-31$7.55$7.55157,000——
2020-01-30$7.34$7.34179,400——
2020-01-29$7.58$7.58116,400——
2020-01-28$7.40$7.4078,800——
2020-01-27$7.26$7.26203,700——
2020-01-24$7.52$7.52255,600——
2020-01-23$7.43$7.43194,900——
2020-01-22$7.63$7.63138,500——
2020-01-21$7.43$7.43170,600——
2020-01-17$7.30$7.30223,600——
2020-01-16$7.16$7.16182,300——
2020-01-15$7.16$7.16287,300——
2020-01-14$6.87$6.87111,200——
2020-01-13$6.71$6.71102,200——
2020-01-10$6.93$6.93373,500——
2020-01-09$7.02$7.02176,700——
2020-01-08$6.94$6.93133,600——
2020-01-07$6.97$6.97278,800——
2020-01-06$6.69$6.69151,400——
2020-01-03$6.59$6.59350,000——
2020-01-02$6.93$6.93167,100——