Fmr Llc ownership in PRTA / Prothena Corporation plc

Prothena Corporation plc

US ˙ NasdaqGS ˙ IE00B91XRN20

Security	PRTA / Prothena Corporation plc
Institution	Fmr Llc
Latest Disclosed Ownership	8,049,796 shares
Ownership	15.00%

2024-02-09 - Fmr Llc has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 8,049,796 shares of Prothena Corporation plc (US:PRTA). This represents 14.999 percent ownership of the company. In their previous filing dated 2023-03-10 , Fmr Llc had reported owning 5,264,847 shares, indicating an increase of 52.90 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)
2024-02-09	2024-02-09	13G/A	5,264,847	8,049,796	52.90	15.00	49.77
2023-03-10	2023-03-10	13G/A	3,947,272	5,264,847	33.38	10.02	29.74
2023-02-09	2023-02-09	13G/A	2,641,741	3,947,272	49.42	7.72	36.16
2022-02-09	2022-02-09	13G	1,482,361	2,641,741	78.21	5.67	52.68
2021-02-08	2021-02-08	13G/A	3,327,349	1,482,361	-55.45	3.71	-55.47
2020-02-07	2020-02-07	13G/A	4,910,430	3,327,349	-32.24	8.34	-32.30
2019-02-13	2019-02-13	13G/A	5,767,014	4,910,430	-14.85	12.32	-17.87
2018-02-13	2018-02-13	13G/A	5,173,264	5,767,014	11.48	15.00	0.00
2017-02-14	2017-02-14	13G/A	4,728,412	5,173,264	9.41	15.00	0.00
2016-02-12	2016-02-12	13G/A		4,728,412		15.00
2015-02-13	2015-02-13	13G/A		4,107,618		15.00
2014-02-14	2014-02-14	13G/A		2,753,292		12.60
2013-06-10	2013-06-10	13G/A		1,993,988		11.28
2013-02-14	2013-02-14	13G		1,698,168		9.61

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	7,551,218	0	0.00	73,398	1.78	0.0008
2026-02-17	2025-12-31	13F	PROTHENA CORP	SHS	G72800108	7,551,218	-350,000	-4.43	72,114	-6.49	0.0037
2025-11-13	2025-09-30	13F	PROTHENA CORP	SHS	G72800108	7,901,218	0	0.00	77,116	60.79	0.0040
2025-08-14	2025-06-30	13F	PROTHENA CORP	SHS	G72800108	7,901,218	-40,184	-0.51	47,960	-51.20	0.0027
2025-05-12	2025-03-31	13F	PROTHENA CORP	SHS	G72800108	7,941,402	-129,907	-1.61	98,275	-12.09	0.0063
2025-02-13	2024-12-31	13F	PROTHENA CORP	SHS	G72800108	8,071,309	4,326	0.05	111,788	-17.17	0.0067
2024-11-13	2024-09-30	13F	PROTHENA CORP	SHS	G72800108	8,066,983	1,306	0.02	134,961	-18.93	0.0082
2024-08-13	2024-06-30	13F	PROTHENA CORP	SHS	G72800108	8,065,677	59,266	0.74	166,476	-16.06	0.0107
2024-05-13	2024-03-31	13F	PROTHENA CORP	SHS	G72800108	8,006,411	-43,385	-0.54	198,319	-32.21	0.0133
2024-02-13	2023-12-31	13F	PROTHENA CORP	SHS	G72800108	8,049,796	19,506	0.24	292,530	-24.50	0.0225
2023-11-13	2023-09-30	13F	PROTHENA CORP	SHS	G72800108	8,030,290	117,524	1.49	387,461	-28.29	0.0335
2023-08-11	2023-06-30	13F	PROTHENA CORP	SHS	G72800108	7,912,766	1,150,741	17.02	540,284	64.84	0.0453
2023-08-11	2023-03-31	13F/A-1	PROTHENA CORP	SHS	G72800108	6,762,025	2,814,753	71.31	327,755	37.81	0.0300
2023-05-11	2023-03-31	13F	PROTHENA CORP	SHS	G72800108	6,762,025	2,814,753		327,755		0.0300
2023-02-13	2022-12-31	13F	PROTHENA CORP	SHS	G72800108	3,947,272	784,854	24.82	237,823	24.04	0.0236
2022-11-10	2022-09-30	13F	PROTHENA CORP	SHS	G72800108	3,162,418	237,020	8.10	191,738	141.41	0.0200
2022-08-12	2022-06-30	13F	PROTHENA CORP	SHS	G72800108	2,925,398	249,784	9.34	79,425	-18.83	0.0079
2022-05-13	2022-03-31	13F	PROTHENA CORP	SHS	G72800108	2,675,614	33,873	1.28	97,848	-25.02	0.0078
2022-02-14	2021-12-31	13F	PROTHENA CORP	SHS	G72800108	2,641,741	-7,690	-0.29	130,503	-30.85	0.0096
2022-02-14	2021-09-30	13F/A-1	PROTHENA CORP	SHS	G72800108	2,649,431	-128,856	-4.64	188,719	32.13	0.0150
2021-11-15	2021-09-30	13F	PROTHENA CORP	SHS	G72800108	2,649,431	-128,856		188,719		0.0150
2021-08-13	2021-06-30	13F	PROTHENA CORP	SHS	G72800108	2,778,287	-337,909	-10.84	142,832	82.47	0.0112
2021-05-14	2021-03-31	13F	PROTHENA CORP	SHS	G72800108	3,116,196	1,633,835	110.22	78,279	339.70	0.0067
2021-02-08	2020-12-31	13F	PROTHENA CORP	SHS	G72800108	1,482,361	-516,509	-25.84	17,803	-10.85	0.0016
2020-11-13	2020-09-30	13F	PROTHENA CORP	SHS	G72800108	1,998,870	41,121	2.10	19,969	-2.49	0.0020
2020-08-24	2020-06-30	13F/A-1	PROTHENA CORP	SHS	G72800108	1,957,749	-1,175,504	-37.52	20,478	-38.92	0.0023
2020-08-13	2020-06-30	13F	PROTHENA CORP	SHS	G72800108	1,957,749	-1,175,504		20,478		503.0845
2020-05-14	2020-03-31	13F	PROTHENA CORP	SHS	G72800108	3,133,253	-194,096	-5.83	33,526	-36.35	0.0046
2020-02-07	2019-12-31	13F	PROTHENA CORP	SHS	G72800108	3,327,349	-45,210	-1.34	52,672	99.21	0.0058
2019-11-13	2019-09-30	13F	PROTHENA CORP	SHS	G72800108	3,372,559	-722,610	-17.65	26,441	-38.92	0.0032
2019-08-13	2019-06-30	13F	PROTHENA CORP	SHS	G72800108	4,095,169	-91,864	-2.19	43,286	-14.77	0.0051
2019-05-13	2019-03-31	13F	PROTHENA CORP	SHS	G72800108	4,187,033	-723,397	-14.73	50,789	0.42	0.0061
2019-02-13	2018-12-31	13F	PROTHENA CORP	SHS	G72800108	4,910,430	-131,934	-2.62	50,577	-23.31	0.0069
2018-11-09	2018-09-30	13F	PROTHENA CORP	SHS	G72800108	5,042,364	-525,958	-9.45	65,954	-18.76	0.0074
2018-08-10	2018-06-30	13F	PROTHENA CORP	SHS	G72800108	5,568,322	-207,958	-3.60	81,186	-61.71	0.0096
2018-05-14	2018-03-31	13F	PROTHENA CORP	SHS	G72800108	5,776,280	14,066	0.24	212,047	-1.84	0.0252
2018-02-12	2017-12-31	13F	PROTHENA CORP	SHS	G72800108	5,762,214	20,952	0.36	216,025	-41.91	0.0253
2017-11-13	2017-09-30	13F	PROTHENA CORP	SHS	G72800108	5,741,262	42,028	0.74	371,862	20.56	0.0450
2017-08-29	2017-06-30	13F/A-1	PROTHENA CORP	SHS	G72800108	5,699,234	39,926	0.71	308,443	-2.31	0.0383
2017-08-11	2017-06-30	13F	PROTHENA CORP	SHS	G72800108	5,699,234	39,926		308,443
2017-05-11	2017-03-31	13F	PROTHENA CORP	SHS	G72800108	5,659,308	486,044	9.40	315,733	24.07	0.0401
2017-02-10	2016-12-31	13F	PROTHENA CORP	SHS	G72800108	5,173,264	13,883	0.27	254,473	-17.75	0.0340
2016-11-14	2016-09-30	13F	PROTHENA CORP	SHS	G72800108	5,159,381	11,800	0.23	309,408	71.93	0.0412
2016-08-11	2016-06-30	13F	PROTHENA CORP	SHS	G72800108	5,147,581	1,572	0.03	179,959	-15.04	0.0246
2016-05-16	2016-03-31	13F	PROTHENA CORP	SHS	G72800108	5,146,009	417,597	8.83	211,810	-34.23	0.0293
2016-02-12	2015-12-31	13F	PROTHENA CORP	SHS	G72800108	4,728,412	25,615	0.54	322,052	51.04	0.0433
2015-11-10	2015-09-30	13F	PROTHENA CORP	SHS	G72800108	4,702,797	9,915	0.21	213,225	-13.73	0.0304
2015-08-25	2015-06-30	13F/A-1	PROTHENA CORP	SHS	G72800108	4,692,882	582,952	14.18	247,174	57.68	0.0317
2015-08-13	2015-06-30	13F	PROTHENA CORP	SHS	G72800108	4,692,882			247,174
2015-05-14	2015-03-31	13F	PROTHENA CORP	SHS	G72800108	4,109,930	2,312	0.06	156,753	83.82	0.0200
2015-02-17	2014-12-31	13F	PROTHENA CORP	SHS	G72800108	4,107,618	1,228	0.03	85,274	-6.29	0.0111
2014-11-14	2014-09-30	13F	PROTHENA CORP	SHS	G72800108	4,106,390	1,353,098	49.14	90,998	46.57	0.0123
2014-08-14	2014-06-30	13F	PROTHENA CORP	SHS	G72800108	2,753,292	-1,128,289	-29.07	62,087	-58.25	0.0083
2014-05-15	2014-03-31	13F	PROTHENA CORP	SHS	G72800108	3,881,581	1,128,289	40.98	148,704	103.65	0.0206
2014-02-13	2013-12-31	13F	PROTHENA CORP	SHS	G72800108	2,753,292	808,732	41.59	73,018	85.62	0.0103
2013-11-14	2013-09-30	13F	PROTHENA CORP	SHS	G72800108	1,944,560	-14,440	-0.74	39,338	55.54	0.0060
2013-09-24	2013-06-30	13F/A-1	PROTHENA CORP	SHS	G72800108	1,959,000	1,959,000		25,291		0.0041
2013-08-14	2013-06-30	13F	PROTHENA CORP	SHS	G72800108	1,959,000			25,291		0.0041

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.