Prothena Corporation plc (PRTA) NASDAQ

Currency In USD

PRTA Historical Return

If you invested $1000 in Prothena Corporation plc (PRTA) 10 years ago, it would be worth $146.02 as of August 02, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $153.96, while $1000 invested 1 year ago would be worth $1,170.03. This corresponds to total returns of -85.4%, -84.6%, 17%, respectively, with annualized returns of -17.49%, -31.2%, 17%.

Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.

PRTA Historical Data

Date Range:

Date	Open	Close	Adj Close	High	Low	Volume
July 31, 2026	8.41	8.12	8.12	8.51	8	545,490
July 30, 2026	8.5	8.41	8.41	8.56	8.26	495,811
July 29, 2026	8.45	8.56	8.56	8.68	8.39	641,213
July 28, 2026	8.7	8.56	8.56	8.78	8.36	802,244
July 27, 2026	8.88	8.7	8.7	9.13	8.66	704,707
July 23, 2026	8.27	8.53	8.53	8.63	8.23	532,211
July 22, 2026	8.69	8.44	8.44	8.79	8.43	542,549
July 21, 2026	8.72	8.75	8.75	8.81	8.51	647,643
July 20, 2026	8.66	8.67	8.67	8.85	8.55	549,606
July 17, 2026	8.4	8.66	8.66	8.8	8.28	397,186
July 16, 2026	8.4	8.47	8.47	8.66	8.07	659,662
July 15, 2026	8.46	8.43	8.43	8.64	8.43	499,869
July 14, 2026	8.77	8.64	8.64	8.88	8.61	530,318
July 13, 2026	9.17	8.83	8.83	9.19	8.76	781,723
July 10, 2026	9.64	9.24	9.24	9.82	9.03	505,129
July 09, 2026	9.83	9.64	9.64	10.02	9.55	482,222
July 08, 2026	9.66	9.85	9.85	9.86	9.56	444,245
July 07, 2026	9.62	9.68	9.68	9.78	9.33	520,542
July 06, 2026	9.65	9.5	9.5	9.84	9.47	403,737
July 02, 2026	9.61	9.69	9.69	10.15	9.57	462,875
July 01, 2026	9.74	9.58	9.58	10	9.47	436,692
June 30, 2026	9.96	9.79	9.79	10.04	9.75	339,626
June 29, 2026	10	9.97	9.97	10.12	9.78	420,061
June 26, 2026	9.32	10.02	10.02	10.09	9.28	1.91M
June 25, 2026	9.42	9.27	9.27	9.58	9.19	964,889
June 24, 2026	9.57	9.4	9.4	9.87	9.26	477,856
June 23, 2026	9.12	9.55	9.55	9.77	9.12	458,044
June 22, 2026	8.9	9.15	9.15	9.27	8.89	612,353
June 18, 2026	8.63	8.93	8.93	9.15	8.52	1.39M
June 17, 2026	8.39	8.49	8.49	8.72	8.39	542,967
June 16, 2026	8.16	8.29	8.29	8.35	7.85	586,250
June 15, 2026	8.69	8.15	8.15	8.77	7.93	622,611
June 12, 2026	8.26	8.25	8.25	8.45	8.23	314,129
June 11, 2026	7.89	8.26	8.26	8.46	7.73	634,189
June 10, 2026	8.42	7.91	7.91	8.59	7.89	456,644
June 09, 2026	8.56	8.47	8.47	8.87	8.35	493,477
June 08, 2026	8.8	8.56	8.56	8.89	8.53	313,207
June 05, 2026	9.25	8.79	8.79	9.38	8.63	0
June 04, 2026	9.03	9.25	9.25	9.45	9.03	504,872
June 03, 2026	9.21	8.92	8.92	9.21	8.73	578,121
June 02, 2026	9.59	9.19	9.19	9.59	9.12	438,919
June 01, 2026	10.03	9.59	9.59	10.07	9.49	457,809
May 29, 2026	9.93	10.18	10.18	10.24	9.8	501,072
May 28, 2026	9.95	9.98	9.98	10.06	9.93	275,641
May 27, 2026	10.11	10.03	10.03	10.26	10.01	616,016
May 26, 2026	9.84	10.06	10.06	10.07	9.45	918,632
May 22, 2026	9.36	9.83	9.83	10	9.36	510,853
May 21, 2026	9.16	9.41	9.41	9.42	9.04	388,721
May 20, 2026	9.09	9.35	9.35	9.41	9.09	624,576
May 19, 2026	9.61	9.07	9.07	9.84	9.02	627,299
May 18, 2026	9.66	9.59	9.59	10.09	9.53	640,147
May 15, 2026	9.73	9.76	9.76	9.86	9.46	699,759
May 14, 2026	9.6	9.86	9.86	9.88	9.42	452,435
May 13, 2026	9.33	9.6	9.6	9.73	9.28	447,796
May 12, 2026	9.67	9.43	9.43	9.82	9.29	495,037
May 11, 2026	10.79	9.67	9.67	10.88	9.46	843,782
May 08, 2026	11	10.73	10.73	11.8	10.62	798,665
May 07, 2026	11.1	10.52	10.52	11.21	10.4	442,890
May 06, 2026	11.19	11.18	11.18	11.3	11.02	333,856
May 05, 2026	10.89	11.19	11.19	11.25	10.89	305,897