Prothena Corporation plc (PRTA)

Historical Shares Outstanding

Current Count

54.1M

Financial Fundamentals

PRTA • Quarterly Data • 5Y View

Date	Shares Out. (M)	Change (M)	Change %
2026-03-31	54.1	0.3	+0.52%
2025-12-31	53.8	0.0	+0.00%
2025-09-30	53.8	0.0	+0.01%
2025-06-30	53.8	0.0	0.00%
2025-03-31	53.8	0.0	+0.02%
2024-12-31	53.8	0.0	+0.05%
2024-09-30	53.8	-1.3	-2.28%
2024-06-30	55.0	1.3	+2.47%
2024-03-31	53.7	0.0	+0.09%
2023-12-31	53.7	-4.3	-7.48%
2023-09-30	58.0	4.9	+9.19%
2023-06-30	53.1	0.6	+1.18%
2023-03-31	52.5	-1.5	-2.74%
2022-12-31	54.0	7.0	+14.88%
2022-09-30	47.0	0.2	+0.39%
2022-06-30	46.8	0.1	+0.22%
2022-03-31	46.7	0.1	+0.18%
2021-12-31	46.6	-4.6	-8.96%
2021-09-30	51.2	3.8	+8.00%
2021-06-30	47.4	7.2	+17.80%
2021-03-31	40.3	0.3	+0.82%
2020-12-31	39.9	0.0	+0.01%
2020-09-30	39.9	0.0	+0.02%
2020-06-30	39.9	0.0	+0.01%
2020-03-31	39.9	0.0	+0.03%
2019-12-31	39.9	0.0	0.00%
2019-09-30	39.9	0.0	+0.06%
2019-06-30	39.9	0.0	+0.02%
2019-03-31	39.9	0.0	0.00%
2018-12-31	39.9	0.0	+0.04%
2018-09-30	39.9	0.0	+0.07%
2018-06-30	39.8	1.1	+2.95%
2018-03-31	38.7	0.2	+0.60%
2017-12-31	38.5	0.2	+0.43%
2017-09-30	38.3	0.2	+0.58%
2017-06-30	38.1	2.3	+6.47%
2017-03-31	35.8	1.2	+3.34%
2016-12-31	34.6	0.2	+0.55%
2016-09-30	34.4	0.1	+0.16%
2016-06-30	34.4	0.3	+0.98%
2016-03-31	34.0	2.4	+7.64%
2015-12-31	31.6	0.2	+0.54%
2015-09-30	31.4	0.6	+2.11%
2015-06-30	30.8	3.4	+12.38%
2015-03-31	27.4	0.0	+0.06%
2014-12-31	27.4	0.0	+0.05%
2014-09-30	27.4	4.5	+19.53%
2014-06-30	22.9	-0.0	-0.19%
2014-03-31	22.9	1.5	+7.24%
2013-12-31	21.4	3.7	+21.01%
2013-09-30	17.7	0.0	0.00%
2013-06-30	17.7	0.0	0.00%
2013-03-31	17.7	2.8	+18.76%
2012-12-31	14.9	-2.8	-15.80%
2012-09-30	17.7	0.0	0.00%
2012-06-30	17.7	0.0	0.00%
2012-03-31	17.7	—	—