NASDAQ:PRTA | Historical Stock Price | PROTHENA CORP PUBLIC LTD CO

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
2012-12-18 to 2026-09-04
Data captured

Stock Price Chart

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

$4.47$7.97$14.21$25.36$45.25$80.732012-12-212026-08-27

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$9.55$9.55475,100
2025-12-30$9.31$9.31363,500
2025-12-29$9.48$9.48495,900
2025-12-26$9.54$9.54424,600
2025-12-24$9.69$9.69237,400
2025-12-23$9.49$9.49703,400
2025-12-22$9.68$9.68688,000
2025-12-19$9.21$9.214,129,700
2025-12-18$9.38$9.38547,600
2025-12-17$9.43$9.43508,000
2025-12-16$9.75$9.75638,900
2025-12-15$9.97$9.97852,600
2025-12-12$10.36$10.36477,700
2025-12-11$10.33$10.33693,400
2025-12-10$9.87$9.87961,400
2025-12-09$10.32$10.32532,200
2025-12-08$10.73$10.73561,900
2025-12-05$11.07$11.07434,700
2025-12-04$11.16$11.161,161,200
2025-12-03$11.17$11.17777,500
2025-12-02$10.35$10.35615,100
2025-12-01$10.27$10.27648,500
2025-11-28$10.75$10.75288,700
2025-11-26$10.43$10.43451,400
2025-11-25$10.50$10.50515,600
2025-11-24$10.40$10.40776,100
2025-11-21$10.48$10.48461,200
2025-11-20$10.05$10.05460,500
2025-11-19$9.99$9.99479,700
2025-11-18$10.36$10.36427,900
2025-11-17$10.25$10.25827,200
2025-11-14$9.93$9.93504,500
2025-11-13$10.18$10.18679,600
2025-11-12$10.85$10.85686,400
2025-11-11$10.48$10.48603,600
2025-11-10$10.53$10.53694,700
2025-11-07$10.56$10.56928,400
2025-11-06$10.08$10.08557,200
2025-11-05$10.27$10.27535,300
2025-11-04$10.26$10.26600,300
2025-11-03$10.54$10.54612,500
2025-10-31$10.75$10.75479,600
2025-10-30$10.48$10.48381,500
2025-10-29$10.65$10.65596,000
2025-10-28$10.54$10.54969,200
2025-10-27$10.37$10.37405,300
2025-10-24$9.82$9.82362,600
2025-10-23$9.75$9.75349,000
2025-10-22$9.88$9.88429,400
2025-10-21$10.22$10.22289,900
2025-10-20$10.37$10.37558,900
2025-10-17$9.92$9.92777,000
2025-10-16$10.09$10.09624,900
2025-10-15$10.66$10.66801,900
2025-10-14$10.12$10.12392,100
2025-10-13$10.35$10.35703,200
2025-10-10$10.05$10.05734,100
2025-10-09$10.30$10.30801,300
2025-10-08$10.35$10.35650,900
2025-10-07$10.17$10.171,033,900
2025-10-06$9.86$9.86343,400
2025-10-03$9.92$9.92852,900
2025-10-02$9.99$9.99767,600
2025-10-01$9.92$9.92965,900
2025-09-30$9.76$9.76989,100
2025-09-29$9.76$9.76946,500
2025-09-26$9.41$9.41715,000
2025-09-25$9.36$9.361,566,800
2025-09-24$9.32$9.321,116,700
2025-09-23$8.31$8.31404,700
2025-09-22$8.29$8.29511,900
2025-09-19$8.07$8.07910,700
2025-09-18$8.18$8.18459,000
2025-09-17$8.06$8.06507,300
2025-09-16$8.16$8.16362,500
2025-09-15$8.16$8.16713,700
2025-09-12$8.21$8.21551,100
2025-09-11$8.43$8.43711,800
2025-09-10$8.31$8.31518,500
2025-09-09$8.34$8.34916,200
2025-09-08$8.49$8.49622,000
2025-09-05$8.55$8.551,128,200
2025-09-04$8.21$8.21961,600
2025-09-03$8.39$8.391,210,400
2025-09-02$8.27$8.271,048,900
2025-08-29$8.20$8.20903,100
2025-08-28$8.24$8.241,711,300
2025-08-27$8.56$8.561,021,100
2025-08-26$8.35$8.351,653,400
2025-08-25$8.38$8.38613,200
2025-08-22$8.77$8.771,244,700
2025-08-21$8.56$8.56858,000
2025-08-20$8.52$8.52639,200
2025-08-19$8.52$8.52829,900
2025-08-18$8.53$8.531,164,500
2025-08-15$8.25$8.251,130,300
2025-08-14$8.06$8.06590,300
2025-08-13$8.05$8.051,598,200
2025-08-12$7.54$7.54906,600
2025-08-11$7.67$7.671,147,200
2025-08-08$7.69$7.69921,200
2025-08-07$7.72$7.721,092,100
2025-08-06$7.92$7.923,107,300
2025-08-05$7.03$7.031,565,300
2025-08-04$6.94$6.94957,900
2025-08-01$6.81$6.81859,900
2025-07-31$6.87$6.87994,900
2025-07-30$6.88$6.881,240,800
2025-07-29$6.93$6.93724,900
2025-07-28$6.87$6.87804,700
2025-07-25$6.68$6.68772,100
2025-07-24$6.70$6.70735,600
2025-07-23$6.76$6.76899,100
2025-07-22$6.53$6.53722,300
2025-07-21$6.29$6.29686,700
2025-07-18$6.26$6.26788,800
2025-07-17$6.47$6.47743,500
2025-07-16$6.32$6.32675,200
2025-07-15$6.22$6.22730,500
2025-07-14$6.43$6.43792,500
2025-07-11$6.40$6.40569,100
2025-07-10$6.57$6.57804,400
2025-07-09$6.58$6.58698,900
2025-07-08$6.52$6.521,021,800
2025-07-07$6.29$6.29897,500
2025-07-03$6.44$6.44636,800
2025-07-02$6.32$6.321,114,600
2025-07-01$6.26$6.261,508,100
2025-06-30$6.07$6.071,139,500
2025-06-27$6.08$6.082,693,000
2025-06-26$6.18$6.182,128,900
2025-06-25$5.99$5.991,200,800
2025-06-24$6.07$6.071,636,000
2025-06-23$6.06$6.062,452,200
2025-06-20$5.72$5.723,572,300
2025-06-18$5.75$5.755,022,800
2025-06-17$5.70$5.703,137,100
2025-06-16$5.66$5.662,180,400
2025-06-13$5.08$5.08806,400
2025-06-12$5.07$5.07652,000
2025-06-11$5.10$5.10843,300
2025-06-10$5.26$5.26694,700
2025-06-09$5.25$5.252,323,100
2025-06-06$5.41$5.411,250,600
2025-06-05$5.06$5.061,496,100
2025-06-04$4.88$4.881,143,000
2025-06-03$4.83$4.831,307,500
2025-06-02$4.66$4.661,775,800
2025-05-30$4.59$4.591,966,100
2025-05-29$4.70$4.705,378,300
2025-05-28$4.60$4.606,238,300
2025-05-27$4.58$4.589,655,100
2025-05-23$6.58$6.581,767,300
2025-05-22$6.55$6.55965,100
2025-05-21$6.82$6.821,137,400
2025-05-20$7.29$7.291,249,800
2025-05-19$7.40$7.40781,400
2025-05-16$7.18$7.181,170,700
2025-05-15$6.72$6.721,115,900
2025-05-14$6.89$6.891,882,800
2025-05-13$7.59$7.592,205,900
2025-05-12$7.61$7.611,425,100
2025-05-09$7.43$7.431,656,900
2025-05-08$7.10$7.101,713,600
2025-05-07$7.29$7.292,003,000
2025-05-06$7.35$7.354,164,900
2025-05-05$8.08$8.083,032,000
2025-05-02$8.50$8.505,557,000
2025-05-01$8.72$8.721,937,200
2025-04-30$9.20$9.20989,400
2025-04-29$9.69$9.69446,000
2025-04-28$9.65$9.65573,600
2025-04-25$9.70$9.70491,700
2025-04-24$9.65$9.65388,600
2025-04-23$9.59$9.59836,700
2025-04-22$9.54$9.541,078,700
2025-04-21$9.30$9.30774,000
2025-04-17$9.20$9.20341,000
2025-04-16$9.26$9.26400,100
2025-04-15$9.59$9.59498,700
2025-04-14$9.94$9.94387,200
2025-04-11$10.22$10.22443,700
2025-04-10$9.69$9.69460,800
2025-04-09$10.26$10.261,329,100
2025-04-08$10.48$10.48746,600
2025-04-07$10.84$10.841,127,100
2025-04-04$10.86$10.86417,000
2025-04-03$11.32$11.32456,500
2025-04-02$12.14$12.14560,600
2025-04-01$11.74$11.74955,400
2025-03-31$12.38$12.38535,700
2025-03-28$13.14$13.14211,900
2025-03-27$13.01$13.01284,200
2025-03-26$13.37$13.37672,300
2025-03-25$12.65$12.65391,200
2025-03-24$13.34$13.34356,200
2025-03-21$12.97$12.97869,600
2025-03-20$12.87$12.87399,100
2025-03-19$12.88$12.88344,200
2025-03-18$12.83$12.83480,000
2025-03-17$13.74$13.74522,000
2025-03-14$13.74$13.74431,400
2025-03-13$14.07$14.07379,200
2025-03-12$13.86$13.86319,200
2025-03-11$13.75$13.75629,100
2025-03-10$14.60$14.60281,900
2025-03-07$15.27$15.27380,100
2025-03-06$15.13$15.13326,600
2025-03-05$14.95$14.95584,000
2025-03-04$15.06$15.06587,000
2025-03-03$14.33$14.33600,000
2025-02-28$15.81$15.81514,600
2025-02-27$15.13$15.13332,200
2025-02-26$14.55$14.55392,500
2025-02-25$14.63$14.63387,700
2025-02-24$15.23$15.23354,000
2025-02-21$15.56$15.56732,600
2025-02-20$15.25$15.25357,700
2025-02-19$14.98$14.98563,300
2025-02-18$13.91$13.91265,500
2025-02-14$14.17$14.17204,600
2025-02-13$13.89$13.89263,700
2025-02-12$13.82$13.82249,400
2025-02-11$13.79$13.79275,000
2025-02-10$14.07$14.07247,200
2025-02-07$14.05$14.05309,600
2025-02-06$14.44$14.44229,100
2025-02-05$14.78$14.78296,400
2025-02-04$14.49$14.49513,500
2025-02-03$13.44$13.44356,100
2025-01-31$14.23$14.23340,000
2025-01-30$14.70$14.70318,600
2025-01-29$15.81$15.81246,000
2025-01-28$15.96$15.96241,100
2025-01-27$16.04$16.04375,300
2025-01-24$15.62$15.62340,200
2025-01-23$15.48$15.48361,700
2025-01-22$14.43$14.43325,400
2025-01-21$14.11$14.11350,500
2025-01-17$13.77$13.77543,600
2025-01-16$13.18$13.18302,500
2025-01-15$13.27$13.27332,800
2025-01-14$12.67$12.67616,800
2025-01-13$13.13$13.13390,300
2025-01-10$13.05$13.05521,800
2025-01-08$14.16$14.16308,900
2025-01-07$14.15$14.15535,600
2025-01-06$13.15$13.15661,000
2025-01-03$13.87$13.87321,800
2025-01-02$13.67$13.67530,000