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 — 2018

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2018-12-31$6.73$6.7396,000
2018-12-28$6.36$6.3643,800
2018-12-27$6.31$6.3137,600
2018-12-26$6.37$6.3767,500
2018-12-24$6.64$6.6437,900
2018-12-21$6.67$6.67125,100
2018-12-20$6.91$6.9188,700
2018-12-19$6.66$6.66133,300
2018-12-18$7.08$7.0893,800
2018-12-17$6.84$6.84107,700
2018-12-14$6.89$6.8937,100
2018-12-13$6.83$6.8339,500
2018-12-12$6.99$6.9921,800
2018-12-11$6.71$6.71116,600
2018-12-10$6.96$6.96109,100
2018-12-07$6.73$6.73105,800
2018-12-06$6.77$6.7796,000
2018-12-04$6.37$6.37122,400
2018-12-03$6.32$6.3277,100
2018-11-30$6.47$6.47250,100
2018-11-29$6.53$6.53298,700
2018-11-28$6.30$6.30778,500
2018-11-27$6.99$6.9968,500
2018-11-26$7.21$7.2142,800
2018-11-23$7.32$7.3219,900
2018-11-21$7.08$7.0843,400
2018-11-20$7.43$7.4329,900
2018-11-19$7.87$7.8757,600
2018-11-16$8.77$8.7765,000
2018-11-15$8.49$8.4985,500
2018-11-14$8.13$8.1341,700
2018-11-13$8.34$8.34141,300
2018-11-12$9.37$9.37232,300
2018-11-09$9.70$9.70115,500
2018-11-08$9.27$9.27146,300
2018-11-07$9.05$9.05148,900
2018-11-06$8.69$8.6958,300
2018-11-05$7.93$7.9318,300
2018-11-02$8.07$8.0773,000
2018-11-01$8.04$8.0465,300
2018-10-31$7.99$7.9945,200
2018-10-30$7.85$7.8533,600
2018-10-29$8.02$8.0277,000
2018-10-26$8.15$8.1558,800
2018-10-25$8.27$8.2761,100
2018-10-24$8.01$8.0191,200
2018-10-23$8.40$8.40158,800
2018-10-22$8.04$8.0477,400
2018-10-19$8.65$8.6551,300
2018-10-18$8.82$8.8254,200
2018-10-17$9.16$9.16120,600
2018-10-16$9.54$9.5471,300
2018-10-15$9.14$9.1491,400
2018-10-12$8.77$8.7739,200
2018-10-11$8.99$8.9971,900
2018-10-10$9.40$9.4084,900
2018-10-09$9.55$9.5576,200
2018-10-08$9.41$9.4191,300
2018-10-05$9.25$9.2568,300
2018-10-04$9.43$9.4384,200
2018-10-03$10.44$10.44252,800
2018-10-02$10.10$10.10145,900
2018-10-01$10.12$10.12144,700
2018-09-28$10.29$10.29121,900
2018-09-27$10.24$10.24940,200
2018-09-26$8.88$8.8864,200
2018-09-25$8.87$8.8734,800
2018-09-24$8.69$8.6961,500
2018-09-21$8.61$8.6156,700
2018-09-20$8.40$8.4056,300
2018-09-19$8.25$8.2561,300
2018-09-18$8.17$8.17101,500
2018-09-17$8.51$8.51116,900
2018-09-14$8.21$8.21239,000
2018-09-13$8.43$8.4396,900
2018-09-12$8.80$8.80161,400
2018-09-11$9.00$9.00215,300
2018-09-10$8.72$8.72116,600
2018-09-07$9.06$9.0680,100
2018-09-06$9.11$9.1194,400
2018-09-05$9.47$9.47104,400
2018-09-04$9.51$9.51183,900
2018-08-31$9.63$9.63104,800
2018-08-30$10.29$10.29186,400
2018-08-29$9.94$9.9473,400
2018-08-28$10.08$10.0858,300
2018-08-27$10.11$10.1190,900
2018-08-24$9.94$9.9475,400
2018-08-23$9.84$9.84548,600
2018-08-22$10.00$10.00175,200
2018-08-21$9.64$9.6498,900
2018-08-20$9.06$9.06122,600
2018-08-17$8.87$8.8798,800
2018-08-16$9.05$9.05101,100
2018-08-15$8.58$8.58241,100
2018-08-14$8.31$8.31376,400
2018-08-13$9.58$9.58184,900
2018-08-10$10.41$10.41285,700
2018-08-09$11.26$11.26863,800
2018-08-08$10.92$10.92477,300
2018-08-07$10.99$10.991,753,400
2018-08-06$11.12$11.125,200,100
2018-08-03$7.01$7.0194,300
2018-08-02$6.98$6.9850,600
2018-08-01$7.02$7.0292,200
2018-07-31$6.92$6.9281,200
2018-07-30$6.97$6.97126,700
2018-07-27$7.14$7.1461,900
2018-07-26$7.26$7.26385,000
2018-07-25$7.15$7.15129,800
2018-07-24$7.20$7.20121,200
2018-07-23$7.75$7.7596,200
2018-07-20$7.89$7.8977,300
2018-07-19$7.92$7.9252,400
2018-07-18$7.82$7.82125,000
2018-07-17$7.87$7.8795,200
2018-07-16$7.53$7.53146,100
2018-07-13$7.45$7.4582,900
2018-07-12$7.43$7.43127,600
2018-07-11$7.47$7.47128,300
2018-07-10$7.58$7.58158,800
2018-07-09$7.09$7.09123,700
2018-07-06$6.99$6.99100,400
2018-07-05$7.01$7.01170,200
2018-07-03$7.13$7.13183,700
2018-07-02$6.82$6.82152,000
2018-06-29$6.72$6.72448,300
2018-06-28$6.72$6.72256,700
2018-06-27$6.75$6.75232,600
2018-06-26$7.17$7.17212,000
2018-06-25$6.97$6.97225,300
2018-06-22$6.85$6.851,291,700
2018-06-21$6.86$6.86431,900
2018-06-20$7.09$7.09265,100
2018-06-19$7.34$7.34194,100
2018-06-18$7.25$7.25146,500
2018-06-15$7.16$7.16200,300
2018-06-14$7.06$7.06197,900
2018-06-13$6.80$6.80217,300
2018-06-12$7.05$7.05193,000
2018-06-11$7.21$7.21114,900
2018-06-08$7.15$7.15180,500
2018-06-07$7.13$7.13240,700
2018-06-06$7.30$7.30394,800
2018-06-05$7.29$7.29373,800
2018-06-04$7.00$7.00201,500
2018-06-01$7.13$7.13476,500
2018-05-31$7.28$7.28280,500
2018-05-30$7.21$7.21296,000
2018-05-29$6.98$6.98345,800
2018-05-25$6.66$6.66357,700
2018-05-24$6.61$6.61228,200
2018-05-23$6.42$6.42227,000
2018-05-22$6.29$6.29231,400
2018-05-21$6.34$6.34232,000
2018-05-18$6.00$6.00278,000
2018-05-17$5.99$5.99259,800
2018-05-16$6.45$6.45201,400
2018-05-15$6.45$6.45281,800
2018-05-14$6.42$6.421,529,200
2018-05-11$6.53$6.53179,400
2018-05-10$6.52$6.52376,800
2018-05-09$8.40$8.4072,700
2018-05-08$8.27$8.27143,500
2018-05-07$8.42$8.42117,600
2018-05-04$8.53$8.53161,900
2018-05-03$8.44$8.4473,800
2018-05-02$8.74$8.74105,000
2018-05-01$8.78$8.7851,900
2018-04-30$8.64$8.6467,500
2018-04-27$8.82$8.8288,600
2018-04-26$8.84$8.8457,200
2018-04-25$8.66$8.6681,500
2018-04-24$8.84$8.8465,600
2018-04-23$8.92$8.9269,700
2018-04-20$8.91$8.91126,100
2018-04-19$8.75$8.75132,200
2018-04-18$8.92$8.92190,800
2018-04-17$9.00$9.00180,700
2018-04-16$8.93$8.93166,500
2018-04-13$8.94$8.94142,300
2018-04-12$9.08$9.08176,400
2018-04-11$8.94$8.94171,200
2018-04-10$8.88$8.88171,800
2018-04-09$8.80$8.80225,900
2018-04-06$8.78$8.78299,200
2018-04-05$8.91$8.91155,800
2018-04-04$9.10$9.10202,100
2018-04-03$8.64$8.64275,500
2018-04-02$8.29$8.29244,900
2018-03-29$8.59$8.59302,300
2018-03-28$8.46$8.46314,100
2018-03-27$9.03$9.03726,800
2018-03-26$8.75$8.754,733,900
2018-03-23$20.43$20.43256,300
2018-03-22$19.73$19.73122,600
2018-03-21$20.41$20.4176,100
2018-03-20$20.57$20.5763,000
2018-03-19$20.61$20.6169,300
2018-03-16$20.30$20.30307,400
2018-03-15$20.59$20.5966,100
2018-03-14$20.41$20.4142,100
2018-03-13$20.67$20.6762,800
2018-03-12$20.94$20.94185,800
2018-03-09$23.08$23.08224,900
2018-03-08$20.23$20.2390,900
2018-03-07$20.89$20.8989,500
2018-03-06$20.65$20.65250,800
2018-03-05$19.81$19.81137,800
2018-03-02$20.86$20.86267,900
2018-03-01$17.41$17.41242,700
2018-02-28$16.95$16.95122,000
2018-02-27$17.06$17.0668,200
2018-02-26$17.25$17.2535,500
2018-02-23$17.46$17.4660,900
2018-02-22$16.89$16.8975,200
2018-02-21$17.97$17.97126,500
2018-02-20$16.55$16.5583,400
2018-02-16$17.57$17.5761,500
2018-02-15$17.66$17.6664,200
2018-02-14$17.50$17.5044,600
2018-02-13$17.41$17.4155,100
2018-02-12$17.20$17.2058,500
2018-02-09$17.58$17.58107,400
2018-02-08$17.03$17.0383,400
2018-02-07$17.88$17.88162,400
2018-02-06$17.98$17.98243,600
2018-02-05$20.37$20.3762,300
2018-02-02$21.52$21.5274,400
2018-02-01$22.83$22.8396,400
2018-01-31$22.86$22.86163,000
2018-01-30$21.96$21.96165,200
2018-01-29$21.75$21.75633,900
2018-01-26$19.23$19.2359,100
2018-01-25$19.85$19.8568,600
2018-01-24$19.16$19.16138,200
2018-01-23$19.47$19.47129,100
2018-01-22$18.92$18.9285,900
2018-01-19$18.99$18.99115,600
2018-01-18$19.04$19.0487,100
2018-01-17$19.46$19.46140,700
2018-01-16$19.38$19.3894,800
2018-01-12$19.84$19.8453,800
2018-01-11$20.16$20.1650,800
2018-01-10$20.67$20.67130,100
2018-01-09$19.83$19.8367,800
2018-01-08$19.68$19.6874,700
2018-01-05$20.48$20.4899,700
2018-01-04$20.90$20.90162,900
2018-01-03$21.02$21.0297,300
2018-01-02$21.15$21.15146,900