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Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
8.67
+0.03 (0.35%)
At close: Feb 27, 2026, 4:00 PM EST
9.15
+0.48 (5.54%)
After-hours: Feb 27, 2026, 7:54 PM EST

Prothena Corporation Stock Price History

Historical Data

DateOpenHighLowCloseAdj. CloseChangeVolume
Feb 27, 20268.538.798.488.678.670.35%385,551
Feb 26, 20268.888.968.638.648.64-2.70%353,586
Feb 25, 20269.009.118.538.888.88-1.00%490,497
Feb 24, 20269.039.308.758.978.97-1.10%448,814
Feb 23, 20269.009.348.819.079.070.55%465,762
Feb 20, 20269.389.598.209.029.02-0.11%786,409
Feb 19, 20269.069.208.809.039.03-0.66%349,703
Feb 18, 20268.819.238.819.099.091.45%305,229
Feb 17, 20268.969.218.808.968.96-374,772
Feb 13, 20268.859.248.858.968.961.24%290,008
Feb 12, 20268.939.048.728.858.85-0.90%333,923
Feb 11, 20269.019.098.658.938.93-0.33%271,111
Feb 10, 20268.819.128.778.968.961.13%329,528
Feb 9, 20268.909.048.598.868.86-0.56%356,096
Feb 6, 20268.588.998.568.918.916.71%581,028
Feb 5, 20268.869.058.238.358.35-6.07%518,973
Feb 4, 20268.779.048.488.898.891.25%451,551
Feb 3, 20268.909.058.618.788.78-1.46%280,865
Feb 2, 20268.798.958.398.918.911.14%556,572
Jan 30, 20268.989.078.658.818.81-2.76%389,955
Jan 29, 20269.159.508.959.069.06-0.88%362,299
Jan 28, 20269.699.789.109.149.14-6.06%411,568
Jan 27, 20269.9210.099.689.739.73-2.11%391,846
Jan 26, 20269.9410.269.779.949.94-0.60%470,287
Jan 23, 202610.3010.539.9910.0010.00-3.29%659,527
Jan 22, 20269.6810.359.6710.3410.346.82%512,235
Jan 21, 20269.289.729.249.689.684.65%591,125
Jan 20, 20269.129.559.009.259.25-1.07%630,848
Jan 16, 20269.299.458.949.359.350.97%740,512
Jan 15, 20269.169.288.919.269.260.65%601,967
Jan 14, 20268.949.268.849.209.202.45%398,465
Jan 13, 20268.779.068.778.988.980.79%470,366
Jan 12, 20269.169.168.658.918.91-3.05%585,586
Jan 9, 20269.199.349.119.199.191.55%401,916
Jan 8, 20269.039.168.959.059.05-0.88%375,982
Jan 7, 20269.009.478.969.139.131.78%467,536
Jan 6, 20269.019.148.898.978.97-1.43%636,208
Jan 5, 20269.249.248.929.109.10-1.09%539,121
Jan 2, 20269.569.699.079.209.20-3.66%526,643
Dec 31, 20259.309.569.249.559.552.58%466,240
Dec 30, 20259.459.529.299.319.31-1.79%353,433
Dec 29, 20259.499.559.349.489.48-0.63%493,479
Dec 26, 20259.679.679.439.549.54-1.55%422,345
Dec 24, 20259.469.749.239.699.692.11%236,347
Dec 23, 20259.539.599.299.499.49-1.96%702,990
Dec 22, 20259.169.789.079.689.685.10%685,146
Dec 19, 20259.389.569.119.219.21-1.81%4,034,524
Dec 18, 20259.469.679.329.389.38-0.53%525,538
Dec 17, 20259.789.919.399.439.43-3.28%508,027
Dec 16, 20259.9510.169.529.759.75-2.21%638,928
Dec 15, 202510.3710.509.949.979.97-3.76%852,645
Dec 12, 202510.4010.4910.2010.3610.360.29%477,695
Dec 11, 20259.9310.509.8110.3310.334.66%693,399
Dec 10, 202510.2810.329.699.879.87-4.36%961,391
Dec 9, 202510.7010.8010.2310.3210.32-3.82%532,153
Dec 8, 202511.2011.3010.7110.7310.73-3.07%561,870
Dec 5, 202511.1811.4810.9811.0711.07-0.81%434,696
Dec 4, 202511.0411.5710.9511.1611.16-0.09%1,161,191
Dec 3, 202510.4011.4810.3111.1711.177.92%777,465
Dec 2, 202510.2910.5310.1410.3510.350.78%615,124
Dec 1, 202510.9811.1310.2210.2710.27-4.47%648,509
Nov 28, 202510.5210.8310.4610.7510.753.07%288,728
Nov 26, 202510.4810.5910.3710.4310.43-0.67%451,420
Nov 25, 202510.5010.6210.3010.5010.500.96%515,553
Nov 24, 202510.5510.9110.2910.4010.40-0.76%776,169
Nov 21, 202510.0210.699.9010.4810.484.28%461,186
Nov 20, 202510.1210.519.9910.0510.050.60%460,489
Nov 19, 202510.2910.499.979.999.99-3.57%479,680
Nov 18, 202510.1810.429.9610.3610.361.07%427,945
Nov 17, 20259.9410.329.7510.2510.253.22%827,245
Nov 14, 202510.0410.339.939.939.93-2.46%504,462
Nov 13, 202510.8310.8310.1210.1810.18-6.18%679,641
Nov 12, 202510.3610.9010.2210.8510.853.53%686,417
Nov 11, 202510.3910.7510.1410.4810.48-0.47%603,643
Nov 10, 202510.9011.0910.4710.5310.53-0.28%694,728
Nov 7, 202510.4910.969.7210.5610.564.76%928,366
Nov 6, 202510.3010.5010.0210.0810.08-1.85%557,222
Nov 5, 202510.1710.4510.0010.2710.270.10%535,313
Nov 4, 202510.4010.5610.1610.2610.26-2.66%600,351
Nov 3, 202510.7611.1710.4110.5410.54-1.95%612,476
Oct 31, 202510.5410.7910.4010.7510.752.58%479,954
Oct 30, 202510.6310.8210.3510.4810.48-1.60%381,487
Oct 29, 202510.6010.8010.3410.6510.651.04%596,013
Oct 28, 202511.1411.6910.4010.5410.541.64%969,343
Oct 27, 20259.9810.409.9510.3710.375.60%405,387
Oct 24, 20259.8010.029.719.829.820.72%362,606
Oct 23, 20259.889.979.729.759.75-1.32%349,011
Oct 22, 202510.2210.359.729.889.88-3.28%429,435
Oct 21, 202510.3710.6110.1810.2210.22-1.49%289,885
Oct 20, 202510.0510.559.9610.3710.374.54%558,918
Oct 17, 20259.9910.239.619.929.92-1.68%777,390
Oct 16, 202510.7610.9010.0310.0910.09-5.35%624,880
Oct 15, 202510.1210.7210.1210.6610.665.34%801,962
Oct 14, 202510.3210.3210.0310.1210.12-2.22%392,072
Oct 13, 202510.0310.3510.0010.3510.352.99%703,194
Oct 10, 202510.3410.459.9810.0510.05-2.43%734,065
Oct 9, 202510.4310.6510.2810.3010.30-0.48%801,307
Oct 8, 202510.2710.5410.1310.3510.351.77%650,937
Oct 7, 202510.1210.379.9210.1710.173.14%1,033,872
Oct 6, 202510.0010.099.779.869.86-0.60%343,503