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 $239.72 as of June 22, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $201.85, while $1000 invested 1 year ago would be worth $1,509.9. This corresponds to total returns of -76.03%, -79.81%, 50.99%, respectively, with annualized returns of -13.3%, -27.38%, 50.99%.

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
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
May 04, 2026	10.58	10.79	10.79	11	10.55	585,184
May 01, 2026	11.04	10.64	10.64	11.14	10.64	516,324
April 30, 2026	10.89	11.06	11.06	11.12	10.84	295,661
April 29, 2026	11.46	10.87	10.87	11.46	10.74	397,550
April 28, 2026	10.84	11.51	11.51	11.57	10.84	433,931
April 27, 2026	10.71	10.79	10.79	11.12	10.71	312,239
April 24, 2026	10.65	10.75	10.75	10.82	10.4	287,924
April 23, 2026	10.69	10.73	10.73	11.07	10.6	474,658
April 22, 2026	10.69	10.72	10.72	10.85	10.61	350,784
April 21, 2026	10.78	10.67	10.67	10.78	10.48	451,019
April 20, 2026	10.82	10.79	10.79	10.97	10.77	318,913
April 17, 2026	10.71	10.9	10.9	10.99	10.7	466,143
April 16, 2026	10.78	10.52	10.52	10.85	10.45	287,472
April 15, 2026	10.62	10.82	10.82	10.87	10.51	382,958
April 14, 2026	10.34	10.61	10.61	10.67	10.34	370,945
April 13, 2026	10.49	10.31	10.31	10.55	10.18	334,062
April 10, 2026	10.6	10.5	10.5	10.6	10.37	319,029
April 09, 2026	10.47	10.58	10.58	10.7	10.38	414,710
April 08, 2026	10.48	10.65	10.65	10.68	10.29	454,454
April 07, 2026	9.98	10.36	10.36	10.37	9.8	481,400
April 06, 2026	9.91	10.04	10.04	10.11	9.88	410,502
April 02, 2026	9.75	9.86	9.86	10.08	9.51	849,122
April 01, 2026	9.84	10.03	10.03	10.12	9.8	577,982
March 31, 2026	9.33	9.72	9.72	9.86	9.33	658,500
March 30, 2026	9.24	9.25	9.25	9.5	9.11	416,146
March 27, 2026	9.42	9.26	9.26	9.62	9.14	430,062
March 26, 2026	9.19	9.52	9.52	9.68	9.16	452,730