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 — 2026

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2026-09-04$9.5019,853
2026-09-03$9.7013,628
2026-09-02$9.6317,067
2026-09-01$9.349,726
2026-08-31$9.2512,565
2026-08-28$8.9632,600
2026-08-27$9.09$9.09338,900$9.1630,661
2026-08-26$9.25$9.25289,000$9.6018,267
2026-08-25$9.42$9.42363,700$9.5631,729
2026-08-24$9.39$9.39248,100$9.4411,097
2026-08-21$9.45$9.45376,000$9.0914,911
2026-08-20$9.03$9.03346,000$9.1421,689
2026-08-19$9.29$9.29385,500$8.9520,464
2026-08-18$8.71$8.71248,600$8.8511,939
2026-08-17$8.88$8.88365,900$8.8418,858
2026-08-14$8.86$8.86312,600$8.9624,331
2026-08-13$9.08$9.08343,100$9.3620,486
2026-08-12$9.26$9.26274,900$9.2821,069
2026-08-11$9.22$9.22475,300$9.0634,968
2026-08-10$9.12$9.12713,700$8.7943,639
2026-08-07$8.76$8.76481,900$8.4724,121
2026-08-06$8.58$8.58418,600$8.6726,789
2026-08-05$8.49$8.49489,500$8.4736,738
2026-08-04$8.49$8.49329,900$8.4317,325
2026-08-03$8.33$8.33566,000$8.0648,022
2026-07-31$8.12$8.12545,500$8.4136,046
2026-07-30$8.41$8.41502,200$8.4543,266
2026-07-29$8.56$8.56641,200$8.6549,497
2026-07-28$8.56$8.56802,200$8.8472,033
2026-07-27$8.70$8.70704,700$8.9254,138
2026-07-24$8.75$8.75576,800$8.8641,173
2026-07-23$8.53$8.53532,200$8.3522,747
2026-07-22$8.44$8.44542,500$8.7030,148
2026-07-21$8.75$8.75647,600$8.6431,135
2026-07-20$8.67$8.67549,600$8.7343,035
2026-07-17$8.66$8.66408,400
2026-07-16$8.47$8.47659,700
2026-07-15$8.43$8.43504,700
2026-07-14$8.64$8.64530,300
2026-07-13$8.83$8.83781,700
2026-07-10$9.24$9.24505,100
2026-07-09$9.64$9.64482,200
2026-07-08$9.85$9.85444,200
2026-07-07$9.68$9.68520,500
2026-07-06$9.50$9.50403,700
2026-07-02$9.69$9.69462,900
2026-07-01$9.58$9.58436,700
2026-06-30$9.79$9.79339,600
2026-06-29$9.97$9.97420,300
2026-06-26$10.02$10.021,914,400
2026-06-25$9.27$9.27964,900
2026-06-24$9.40$9.40477,900
2026-06-23$9.55$9.55458,000
2026-06-22$9.15$9.15612,500
2026-06-18$8.93$8.931,390,800
2026-06-17$8.49$8.49543,000
2026-06-16$8.29$8.29586,300
2026-06-15$8.15$8.15622,600
2026-06-12$8.25$8.25315,400
2026-06-11$8.26$8.26634,200
2026-06-10$7.91$7.91457,000
2026-06-09$8.47$8.47493,500
2026-06-08$8.56$8.56313,200
2026-06-05$8.79$8.79656,300
2026-06-04$9.25$9.25504,900
2026-06-03$8.92$8.92593,200
2026-06-02$9.19$9.19439,000
2026-06-01$9.59$9.59457,800
2026-05-29$10.18$10.18501,400
2026-05-28$9.98$9.98281,800
2026-05-27$10.03$10.03616,200
2026-05-26$10.06$10.06918,600
2026-05-22$9.83$9.83510,900
2026-05-21$9.41$9.41388,700
2026-05-20$9.35$9.35624,900
2026-05-19$9.07$9.07627,300
2026-05-18$9.59$9.59651,000
2026-05-15$9.76$9.76700,100
2026-05-14$9.86$9.86452,400
2026-05-13$9.60$9.60530,800
2026-05-12$9.43$9.43495,100
2026-05-11$9.67$9.67932,800
2026-05-08$10.73$10.73798,700
2026-05-07$10.52$10.52443,100
2026-05-06$11.18$11.18333,900
2026-05-05$11.19$11.19306,800
2026-05-04$10.79$10.79592,400
2026-05-01$10.64$10.64516,300
2026-04-30$11.06$11.06319,500
2026-04-29$10.87$10.87397,700
2026-04-28$11.51$11.51439,900
2026-04-27$10.79$10.79314,000
2026-04-24$10.75$10.75287,900
2026-04-23$10.73$10.73474,700
2026-04-22$10.72$10.72350,800
2026-04-21$10.67$10.67451,100
2026-04-20$10.79$10.79333,300
2026-04-17$10.90$10.90486,500
2026-04-16$10.52$10.52298,900
2026-04-15$10.82$10.82409,900
2026-04-14$10.61$10.61370,900
2026-04-13$10.31$10.31334,100
2026-04-10$10.50$10.50319,000
2026-04-09$10.58$10.58414,700
2026-04-08$10.65$10.65454,500
2026-04-07$10.36$10.36481,400
2026-04-06$10.04$10.04412,500
2026-04-02$9.86$9.86849,100
2026-04-01$10.03$10.03593,300
2026-03-31$9.72$9.72671,500
2026-03-30$9.25$9.25416,200
2026-03-27$9.26$9.26430,100
2026-03-26$9.52$9.52452,700
2026-03-25$9.31$9.31543,700
2026-03-24$8.73$8.73534,700
2026-03-23$8.82$8.82487,600
2026-03-20$8.75$8.751,401,600
2026-03-19$8.54$8.54467,800
2026-03-18$8.59$8.59495,900
2026-03-17$9.00$9.00467,100
2026-03-16$9.17$9.17511,800
2026-03-13$9.21$9.21584,500
2026-03-12$9.31$9.31737,000
2026-03-11$9.58$9.58701,200
2026-03-10$9.77$9.77628,400
2026-03-09$9.81$9.81626,500
2026-03-06$9.59$9.59651,800
2026-03-05$9.46$9.46509,800
2026-03-04$9.86$9.86543,300
2026-03-03$9.36$9.36553,400
2026-03-02$9.40$9.40811,100
2026-02-27$8.67$8.67439,400
2026-02-26$8.64$8.64355,700
2026-02-25$8.88$8.88490,500
2026-02-24$8.97$8.97448,800
2026-02-23$9.07$9.07465,800
2026-02-20$9.02$9.02786,400
2026-02-19$9.03$9.03349,700
2026-02-18$9.09$9.09307,600
2026-02-17$8.96$8.96374,800
2026-02-13$8.96$8.96308,600
2026-02-12$8.85$8.85351,700
2026-02-11$8.93$8.93271,100
2026-02-10$8.96$8.96329,500
2026-02-09$8.86$8.86356,100
2026-02-06$8.91$8.91581,000
2026-02-05$8.35$8.35518,900
2026-02-04$8.89$8.89451,800
2026-02-03$8.78$8.78280,900
2026-02-02$8.91$8.91556,700
2026-01-30$8.81$8.81390,000
2026-01-29$9.06$9.06362,300
2026-01-28$9.14$9.14422,200
2026-01-27$9.73$9.73393,100
2026-01-26$9.94$9.94470,300
2026-01-23$10.00$10.00659,500
2026-01-22$10.34$10.34512,700
2026-01-21$9.68$9.68591,400
2026-01-20$9.25$9.25630,800
2026-01-16$9.35$9.35761,500
2026-01-15$9.26$9.26602,000
2026-01-14$9.20$9.20398,500
2026-01-13$8.98$8.98470,400
2026-01-12$8.91$8.91585,600
2026-01-09$9.19$9.19401,900
2026-01-08$9.05$9.05376,000
2026-01-07$9.13$9.13468,700
2026-01-06$8.97$8.97636,400
2026-01-05$9.10$9.10539,100
2026-01-02$9.20$9.20526,900