PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, par value $0.01 per share (PRTA)

Historical Holders from Q1 2014 to Q4 2025

Type / Class: Equity / Ordinary Shares, par value $0.01 per share
Symbol: PRTA on Nasdaq
Shares outstanding: 54,411,037
Price per share: $9.55
All holders as of 30 Sep 2025: Q3 2025
Total 13F shares as of 30 Sep 2025: 42,604,757
Total reported value: $415,804,606
% of total 13F portfolios: 0%
Share change: +647,229
Value change: +$14,003,701
Avg buy value change: +0%
Avg sell value change: -0%
Number of holders: 185
Price from insider filings: $7.64

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Significant Owners of PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, par value $0.01 per share (PRTA) based on Schedule 13D/G filings

Filer	Ownership	Change %	Holdings Value	Net Change	Nb Shares	Change %	Reporting Name	Report Period
SCULLY WILLIAM P	9.8%	-1%	$51,550,817	-$683,200	5,281,846	-1.3%	SCULLY WILLIAM P	30 Sep 2025
Fennell Todd W.	8.4%	+3.8%	$43,879,457	+$1,415,200	4,495,846	+3.3%	Fennell Todd W.	30 Sep 2025
BlackRock, Inc.	5.7%		$30,180,467		3,092,261		BlackRock, Inc.	30 Sep 2025
ADAR1 Capital Management, LLC	2.7%	-60%	$14,338,396	-$18,601,691	1,469,098	-56%	ADAR1 Capital Management, LLC	30 Sep 2025
WELLINGTON MANAGEMENT GROUP LLP	0.2%	-93%	$821,299	-$38,122,050	108,208	-98%	Wellington Management Group LLP	30 May 2025
PRICE T ROWE ASSOCIATES INC /MD/	0.1%		$585,427		71,047		T. Rowe Price Associates, Inc.	30 Jun 2025

As of 30 Sep 2025, PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, par value $0.01 per share (PRTA) has 185 institutional shareholders filing 13F forms. They hold 42,604,757 shares. of 54,411,037 outstanding shares (78%) .

Top 25 institutional shareholders own 62% of the company.

Filer	Ownership	Nb Shares	Share Change %	Portfolio %	Holdings Value
FMR LLC	15%	7,901,218	0%	0%	$77,115,888
BlackRock, Inc.	6.6%	3,598,417	-8.7%	0%	$35,120,550
VANGUARD GROUP INC	3.8%	2,049,849	-5.8%	0%	$20,006,526
ARMISTICE CAPITAL, LLC	3.4%	1,824,000	-18%	0.56%	$17,802,240
Rubric Capital Management LP	2.8%	1,540,373		0.2%	$15,034,040
ADAR1 Capital Management, LLC	2.7%	1,469,098	-56%	1.4%	$14,338,396
Palo Alto Investors LP	2.4%	1,324,028	+3.9%	2.4%	$12,922,513
D. E. Shaw & Co., Inc.	2.4%	1,315,418	+236%	0.01%	$12,838,480
ACADIAN ASSET MANAGEMENT LLC	2.3%	1,239,242	+22%	0.02%	$12,090,000
GEODE CAPITAL MANAGEMENT, LLC	1.9%	1,019,483	+9.2%	0%	$9,952,225
STATE STREET CORP	1.7%	901,038	-10%	0%	$8,794,131
JACOBS LEVY EQUITY MANAGEMENT, INC	1.6%	876,528	+26%	0.03%	$8,554,913
DIMENSIONAL FUND ADVISORS LP	1.5%	806,988	-16%	0%	$7,876,161
MORGAN STANLEY	1.5%	799,674	-16%	0%	$7,804,823
CITADEL ADVISORS LLC	1.4%	767,105	-33%	0.01%	$7,486,945
JPMORGAN CHASE & CO	1.4%	735,765	+480%	0%	$7,181,066
FEDERATED HERMES, INC.	1.3%	692,818	-41%	0.01%	$6,761,904
Nuveen, LLC	1.2%	668,290	+447%	0%	$6,522,511
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	1.2%	654,294		0%	$6,385,909
Point72 Asset Management, L.P.	1.2%	646,746		0.01%	$6,312,240
MILLENNIUM MANAGEMENT LLC	1.1%	621,099	+264%	0%	$6,061,926
JANE STREET GROUP, LLC	1.1%	619,792	+428%	0.01%	$6,049,170
Mariner, LLC	1.1%	590,897	+53%	0.01%	$5,767,155
Rangeley Capital, LLC	1%	560,457	-22%	5.3%	$5,470,060
Birchview Capital, LP	1%	549,019	+22%	4%	$5,358,425

Institutional Holders of PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, par value $0.01 per share (PRTA) across Reporting Periods

Period	Reported Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (% of par)	Investors
2025 Q4	142,544	$1,361,474	-$62,172			955.05%	6
2025 Q3	42,604,757	$415,804,606	+$14,003,701	$10,903,872	$6,352,784	976%	185
2025 Q2	41,776,362	$253,618,091	-$154,369,080	$4,781,339	$5,305,787	607%	189
2025 Q1	52,255,121	$646,535,777	-$15,376,884	$943,113	$3,048,726	1,237.5%	158
2024 Q4	53,520,473	$741,304,127	+$20,762,225	$3,559,985	$6,583,269	1,385%	168
2024 Q3	50,778,311	$849,965,759	-$24,976,423	$1,652,924	$2,628,283	1,673%	160
2024 Q2	50,801,335	$1,048,527,965	-$58,176,785	$1,851,408	$1,500,528	2,064%	159
2024 Q1	53,382,230	$1,322,286,493	-$28,106,035	$3,500,001	$2,833,688	2,477%	163
2023 Q4	52,719	$1,915,808	-$3,751,882			3,634%	2
2023 Q3	52,856,575	$2,549,592,749	+$22,387,543	$17,268,675	$9,027,575	4,825%	181
2023 Q2	51,605,903	$3,523,765,121	+$9,989,997	$26,137,584	$16,817,364	6,828%	191
2023 Q1	51,844,029	$2,512,847,969	+$112,504,984	$3,005,140	$5,399,558	4,847%	188
2022 Q4	49,391,867	$2,975,783,734	+$290,312,916	$5,729,775	$20,262,075	6,025%	199
2022 Q3	44,345,008	$2,688,471,936	-$39,112,312	$23,531,890	$29,076,150	6,062.99%	168
2022 Q2	44,406,634	$1,204,414,637	+$8,218,090	$1,200,000	$5,058,000	2,714.99%	144
2022 Q1	41,389,290	$1,514,456,005	+$37,413,012	$2,395,000	$7,402,000	3,657.02%	153
2021 Q4	40,196,234	$1,985,565,338	+$71,780,279	$4,353,000	$8,063,000	4,940%	175
2021 Q3	40,917,260	$2,914,513,978	+$42,817,818	$10,819,000	$16,965,000	7,122.98%	177
2021 Q2	40,412,666	$2,077,403,375	+$56,246,655	$7,264,000	$15,043,000	5,140.93%	144
2021 Q1	39,973,510	$1,004,203,160	+$174,467,326	$4,026,000	$16,065,000	2,512%	133
2020 Q4	31,035,956	$372,744,621	-$10,891,844	$1,150,000	$1,499,000	1,200.98%	117
2020 Q3	36,212,123	$361,755,867	-$14,470,265	$1,618,000	$1,363,000	999%	120
2020 Q2	37,648,206	$393,796,371	+$5,316,352	$1,497,000	$0	1,046%	117
2020 Q1	37,168,286	$397,696,613	+$368,032	$589,000	$2,289,000	1,070%	106
2019 Q4	36,818,339	$582,760,024	-$7,393,940	$200,000	$7,781,000	1,583%	113
2019 Q3	36,548,457	$286,535,144	+$56,804,806	$140,000	$672,000	784%	100
2019 Q2	29,919,311	$316,086,930	+$31,095,544	$264,000	$273,000	1,056.99%	111
2019 Q1	35,587,832	$431,679,599	-$11,167,513	$1,775,000	$485,000	1,213%	106
2018 Q4	40,141,562	$413,452,989	-$11,200,197	$7,335,000	$2,632,000	1,030%	92
2018 Q3	36,438,893	$476,651,709	-$27,022,568	$18,259,000	$2,664,000	1,308%	98
2018 Q2	38,150,632	$556,242,338	-$68,361,788	$2,963,000	$8,102,000	1,458%	94
2018 Q1	42,223,284	$1,550,010,237	-$42,554,164	$16,913,000	$60,147,000	3,671%	124
2017 Q4	43,293,201	$1,623,062,307	-$23,389,820	$4,851,000	$5,728,000	3,748.93%	134
2017 Q3	42,998,470	$2,785,122,622	+$63,245,244	$9,477,000	$4,282,000	6,477%	133
2017 Q2	42,496,206	$2,299,887,492	+$51,927,940	$10,132,000	$4,232,000	5,411.97%	129
2017 Q1	41,407,737	$2,307,559,824	+$349,950,828	$12,804,000	$6,773,000	5,578.99%	131
2016 Q4	37,879,812	$1,863,322,839	+$78,305,791	$2,774,000	$3,636,000	4,919.01%	127
2016 Q3	35,808,110	$2,145,959,786	+$92,212,172	$20,816,000	$4,408,000	5,996.99%	121
2016 Q2	34,701,732	$1,213,194,050	-$16,753,580	$5,556,000	$3,346,000	3,496%	118
2016 Q1	34,924,327	$1,437,512,150	+$167,539,907	$10,961,000	$8,998,000	4,115.91%	121
2015 Q4	29,912,955	$2,037,430,890	+$281,368	$12,423,000	$11,960,000	6,810.95%	142
2015 Q3	30,067,053	$1,363,234,716	+$29,694,946	$6,396,000	$10,573,000	4,533.97%	128
2015 Q2	28,888,369	$1,521,546,990	+$212,430,189	$5,273,000	$9,971,000	5,267%	118
2015 Q1	25,360,776	$967,254,808	+$43,275,507	$6,730,000	$3,997,000	3,814.01%	105
2014 Q4	24,696,818	$514,897,605	-$1,937,619	$3,770,000	$2,849,000	2,075.97%	104
2014 Q3	21,484,956	$476,100,873	-$16,870,681	$6,262,000	$4,296,000	2,216%	105
2014 Q2	22,074,007	$497,753,582	+$4,316,665	$3,716,000	$3,007,000	2,255%	108
2014 Q1	20,669,554	$791,826,611	+$189,798,853	$4,772,000	$3,226,000	3,831%	103