State Street Corp ownership in 0PT / Prothena Corporation plc

Prothena Corporation plc

DE ˙ DB ˙ IE00B91XRN20

€ 7,74 ↑0.39 (5.30%)

2026-06-04
PREÇO DA AÇÃO

Security	DE:0PT / Prothena Corporation plc
Institution	State Street Corp
Latest Disclosed Ownership	1,674,909 shares
Ownership	3.10%

2024-10-18 - State Street Corp has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,674,909 shares of Prothena Corporation plc (DE:0PT). This represents 3.1 percent ownership of the company. In their previous filing dated 2024-01-24 , State Street Corp had reported owning 2,758,564 shares, indicating a decrease of -39.28 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2024-10-18	2024-10-18	13G/A	2,758,564	1,674,909	-39.28	3.10	-39.69
2024-01-24	2024-01-24	13G		2,758,564		5.14

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-15	2026-03-31	13F	PROTHENA CORP	SHS	G72800108	1,938,498	-329,304	-14.52	18,842	-13.00	0.0007
2026-02-13	2025-12-31	13F	PROTHENA CORP	SHS	G72800108	2,267,802	1,366,764	151.69	21,658	146.27	0.0007
2025-11-14	2025-09-30	13F	PROTHENA CORP	SHS	G72800108	901,038	-103,964	-10.34	8,794	44.16	0.0003
2025-08-14	2025-06-30	13F	PROTHENA CORP	SHS	G72800108	1,005,002	-516,362	-33.94	6,100	-67.60	0.0002
2025-05-15	2025-03-31	13F	PROTHENA CORP	SHS	G72800108	1,521,364	-340,277	-18.28	18,827	-26.98	0.0008
2025-02-14	2024-12-31	13F	PROTHENA CORP	SHS	G72800108	1,861,641	186,732	11.15	25,784	-7.99	0.0010
2024-11-14	2024-09-30	13F	PROTHENA CORP	SHS	G72800108	1,674,909	-257,563	-13.33	28,021	-29.75	0.0011
2024-08-14	2024-06-30	13F	PROTHENA CORP	SHS	G72800108	1,932,472	-1,541,524	-44.37	39,886	-53.65	0.0017
2024-05-15	2024-03-31	13F	PROTHENA CORP	SHS	G72800108	3,473,996	715,432	25.93	86,051	-14.16	0.0038
2024-02-14	2023-12-31	13F	PROTHENA CORP	SHS	G72800108	2,758,564	648,331	30.72	100,246	-1.54	0.0049
2023-11-14	2023-09-30	13F	PROTHENA CORP	SHS	G72800108	2,110,233	236,555	12.63	101,819	-20.41	0.0056
2023-08-14	2023-06-30	13F	PROTHENA CORP	SHS	G72800108	1,873,678	-228,780	-10.88	127,935	25.54	0.0067
2023-05-15	2023-03-31	13F	PROTHENA CORP	SHS	G72800108	2,102,458	50,498	2.46	101,905	-17.57	0.0058
2023-05-15	2022-12-31	13F/A-99	PROTHENA CORP	SHS	G72800108	2,051,960	170,166	9.04	123,631	8.36	0.0073
2023-05-15	2022-12-31	13F	PROTHENA CORP	SHS	G72800108	2,051,960	170,166		123,631		0.0073
2022-11-15	2022-09-30	13F	PROTHENA CORP	SHS	G72800108	1,881,794	-364,279	-16.22	114,093	87.10	0.0072
2022-08-15	2022-06-30	13F	PROTHENA CORP	SHS	G72800108	2,246,073	-121,510	-5.13	60,981	-29.57	0.0037
2022-05-16	2022-03-31	13F	PROTHENA CORP	SHS	G72800108	2,367,583	394,633	20.00	86,583	-11.16	0.0043
2022-02-14	2021-12-31	13F	PROTHENA CORP	SHS	G72800108	1,972,950	567,706	40.40	97,464	-2.63	0.0046
2021-11-15	2021-09-30	13F	PROTHENA CORP	SHS	G72800108	1,405,244	176,765	14.39	100,096	58.49	0.0053
2021-08-16	2021-06-30	13F	PROTHENA CORP	SHS	G72800108	1,228,479	24,187	2.01	63,156	108.77	0.0033
2021-07-09	2021-03-31	13F/A-1	PROTHENA CORP	SHS	G72800108	1,204,292	594,142	97.38	30,252	312.83	0.0017
2021-05-17	2021-03-31	13F	PROTHENA CORP	SHS	G72800108	1,204,292	594,142		30,252		0.0017
2021-02-16	2020-12-31	13F	PROTHENA CORP	SHS	G72800108	610,150	-623,301	-50.53	7,328	-40.53	0.0004
2020-11-10	2020-09-30	13F	PROTHENA CORP	SHS	G72800108	1,233,451	-204,174	-14.20	12,322	-18.06	0.0008
2020-08-14	2020-06-30	13F	PROTHENA CORP	SHS	G72800108	1,437,625	384,177	36.47	15,038	33.41	0.0011
2020-06-19	2020-03-31	13F/A-1	PROTHENA CORP	SHS	G72800108	1,053,448	15,176	1.46	11,272	-31.42	0.0010
2020-05-11	2020-03-31	13F	PROTHENA CORP	SHS	G72800108	1,053,448	15,176		11,272		989.9086
2020-02-06	2019-12-31	13F	PROTHENA CORP	SHS	G72800108	1,038,272	-158,351	-13.23	16,436	75.19	0.0011
2019-11-14	2019-09-30	13F	PROTHENA CORP	SHS	G72800108	1,196,623	-184,789	-13.38	9,382	-35.75	0.0007
2019-08-14	2019-06-30	13F	PROTHENA CORP	SHS	G72800108	1,381,412	-140,388	-9.23	14,602	-20.89	0.0011
2019-05-15	2019-03-31	13F	PROTHENA CORP	SHS	G72800108	1,521,800	-1,371	-0.09	18,459	17.66	0.0014
2019-02-12	2018-12-31	13F	PROTHENA CORP	SHS	G72800108	1,523,171	-409,827	-21.20	15,689	-37.94	0.0014
2018-11-09	2018-09-30	13F	PROTHENA CORP	Common equity shares	G72800108	1,932,998	-1,488,475	-43.50	25,281	-49.32	0.0019
2018-08-14	2018-06-30	13F	PROTHENA CORP	Common equity shares	G72800108	3,421,473	1,674,378	95.84	49,881	-22.23	0.0042
2018-05-15	2018-03-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,747,095	358,674	25.83	64,136	23.22	0.0054
2018-02-14	2017-12-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,388,421	183,195	15.20	52,049	-33.32	0.0042
2017-11-14	2017-09-30	13F	PROTHENA CORP	Common equity shares	G72800108	1,205,226	23,861	2.02	78,055	22.09	0.0067
2017-08-14	2017-06-30	13F	PROTHENA CORP	Common equity shares	G72800108	1,181,365	113,193	10.60	63,932	7.28	0.0057
2017-05-15	2017-03-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,068,172	-17,239	-1.59	59,594	11.62	0.0053
2017-02-09	2016-12-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,085,411	13,694	1.28	53,392	-16.93	0.0050
2017-01-13	2016-09-30	13F/A-1	PROTHENA CORP	Common equity shares	G72800108	1,071,717	139,364	14.95	64,272	97.21	0.0065
2016-11-14	2016-09-30	13F	PROTHENA CORP	Common equity shares	G72800108	1,071,717			64,272
2016-08-12	2016-06-30	13F	PROTHENA CORP	Common equity shares	G72800108	932,353	-292,170	-23.86	32,590	-35.34	0.0035
2016-05-20	2016-03-31	13F/A-1	PROTHENA CORP	Common equity shares	G72800108	1,224,523	415,089	51.28	50,406	-8.57	0.0054
2016-05-12	2016-03-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,224,523			50,406
2016-02-16	2015-12-31	13F	PROTHENA CORP	Common equity shares	G72800108	809,434	-159,371	-16.45	55,130	25.51	0.0060
2015-11-16	2015-09-30	13F	PROTHENA CORP	Common equity shares	G72800108	968,805	-97,172	-9.12	43,925	-21.76	0.0051
2015-08-13	2015-06-30	13F	PROTHENA CORP	Common equity shares	G72800108	1,065,977	-123,599	-10.39	56,143	23.76	0.0060
2015-05-15	2015-03-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,189,576	39,879	3.47	45,366	90.10	0.0047
2015-02-11	2014-12-31	13F	PROTHENA CORP	Common equity shares	G72800108	1,149,697	134,060	13.20	23,864	6.03	0.0024
2014-11-12	2014-09-30	13F/A-1	PROTHENA CORP	Common equity shares	G72800108	1,015,637	116,268	12.93	22,506	10.97	0.0024
2014-11-10	2014-09-30	13F	PROTHENA CORP	Common equity shares	G72800108	1,015,637			22,506
2014-08-12	2014-06-30	13F	PROTHENA CORP	Common equity shares	G72800108	899,369	680,869	311.61	20,281	142.28	0.0022
2014-05-15	2014-03-31	13F/A-1	PROTHENA CORP	Common equity shares	G72800108	218,500	23,421	12.01	8,371	61.91	0.0010
2014-05-13	2014-03-31	13F	PROTHENA CORP	Common equity shares	G72800108	218,600			8,375
2014-02-06	2013-12-31	13F/A-1	PROTHENA CORP	Common equity shares	G72800108	195,079	43,073	28.34	5,170	68.35	0.0006
2014-02-06	2013-12-31	13F	PROTHENA CORP	Common equity shares	G72800108	258,358			1,889
2013-11-12	2013-09-30	13F	PROTHENA CORP	Common equity shares	G72800108	152,006	31,966	26.63	3,071	98.39	0.0004
2013-08-08	2013-06-30	13F	PROTHENA CORP	Common equity shares	G72800108	120,040	120,040		1,548		0.0002

Legend

Shares: The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value: The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price: The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class: This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred

Allocation (%): The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation: The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%): The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis: The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss: This is the market value of the position as of the effective date minus the cost basis.