PRTA Insider Trading

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Insider Trading History
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About

Insider Ownership Percentage: 28.20%

Insider Buying (Last 12 Months): $0.00

Insider Selling (Last 12 Months): $0.00

Prothena Insider Trading History Chart

Prothena Share Price & Price History

^$11.32

▼ -0.82 (-6.75%)

As of 04/3/2025 05:00 PM ET

Days: 30 | 90 | 365

Prothena Insider Trading History

Transaction Date	Insider Name	Title	Buy/Sell	Number of Shares	Average Share Price	Total Transaction	Shares Held After Transaction
1/24/2024	Karin L. Walker	CAO	Sell	5,000	$34.00	$170,000.00
12/20/2023	Karin L. Walker	CAO	Sell	5,000	$37.19	$185,950.00
11/30/2023	Karin L. Walker	CAO	Sell	5,000	$34.00	$170,000.00
10/25/2023	Karin L. Walker	CAO	Sell	5,000	$41.04	$205,200.00
10/11/2023	Brandon S. Smith	COO	Sell	4,000	$46.75	$187,000.00
10/4/2023	Carol D. Karp	insider	Sell	5,000	$46.62	$233,100.00
9/27/2023	Michael J. Malecek	insider	Sell	5,000	$47.38	$236,900.00
9/19/2023	Karin L. Walker	CAO	Sell	5,000	$52.36	$261,800.00
9/13/2023	Brandon S. Smith	COO	Sell	4,000	$55.49	$221,960.00
9/13/2023	Hideki Garren	insider	Sell	2,000	$55.48	$110,960.00
9/6/2023	Carol D. Karp	insider	Sell	5,000	$54.76	$273,800.00
8/30/2023	Michael J. Malecek	insider	Sell	5,000	$55.01	$275,050.00
8/18/2023	Karin L. Walker	CAO	Sell	5,000	$57.18	$285,900.00
8/16/2023	Brandon S. Smith	COO	Sell	4,000	$58.71	$234,840.00
8/16/2023	Hideki Garren	insider	Sell	2,000	$58.74	$117,480.00
8/2/2023	Wagner M. Zago	insider	Sell	4,000	$67.05	$268,200.00
7/26/2023	Michael J. Malecek	insider	Sell	5,000	$62.33	$311,650.00
7/19/2023	Karin L. Walker	CAO	Sell	5,000	$69.19	$345,950.00
7/12/2023	Brandon S. Smith	COO	Sell	4,000	$67.51	$270,040.00
7/12/2023	Hideki Garren	insider	Sell	2,000	$67.51	$135,020.00
7/5/2023	Carol D. Karp	insider	Sell	5,000	$68.13	$340,650.00
7/3/2023	Dennis J Selkoe	Director	Sell	5,000	$67.43	$337,150.00	2,845
6/28/2023	Michael J. Malecek	insider	Sell	5,000	$69.82	$349,100.00
6/16/2023	Hideki Garren	insider	Sell	7,331	$74.00	$542,494.00
6/14/2023	Brandon S. Smith	COO	Sell	5,333	$73.98	$394,535.34
6/14/2023	Hideki Garren	insider	Sell	4,669	$74.22	$346,533.18
6/7/2023	Wagner M. Zago	insider	Sell	19,000	$71.06	$1,350,140.00
5/31/2023	Michael J. Malecek	insider	Sell	5,000	$64.64	$323,200.00
5/19/2023	Karin L. Walker	CAO	Sell	5,000	$74.00	$370,000.00
5/17/2023	Gene G Kinney	CEO	Sell	45,000	$73.70	$3,316,500.00	12,793
5/17/2023	Tran Nguyen	CFO	Sell	95,000	$73.99	$7,029,050.00	3,200
5/3/2023	Dennis J Selkoe	Director	Sell	15,000	$57.00	$855,000.00	2,845
4/26/2023	Michael J. Malecek	insider	Sell	5,000	$53.46	$267,300.00
4/19/2023	Karin L. Walker	CAO	Sell	5,000	$52.90	$264,500.00
3/29/2023	Michael J. Malecek	insider	Sell	5,000	$49.02	$245,100.00
3/20/2023	Karin L. Walker	CAO	Sell	5,000	$47.72	$238,600.00
3/15/2023	Karin L. Walker	CAO	Sell	20,000	$48.42	$968,400.00
3/15/2023	Michael J. Malecek	insider	Sell	15,000	$48.44	$726,600.00
3/15/2023	Tran Nguyen	CFO	Sell	10,000	$48.43	$484,300.00	3,200
2/15/2023	Tran Nguyen	CFO	Sell	10,000	$53.34	$533,400.00	3,200
1/18/2023	Tran Nguyen	CFO	Sell	10,000	$55.53	$555,300.00	3,200
1/10/2023	Shane Cooke	Director	Sell	5,000	$52.92	$264,600.00
1/5/2023	Richard T Collier	Director	Sell	5,000	$52.67	$263,350.00	1,219
1/3/2023	Lars Ekman	Insider	Sell	15,834	$55.98	$886,387.32	243
12/21/2022	Tran Nguyen	CFO	Sell	10,000	$58.97	$589,700.00	3,200
12/12/2022	Shane Cooke	Director	Sell	5,000	$61.04	$305,200.00
12/5/2022	Richard T Collier	Director	Sell	5,000	$62.07	$310,350.00	1,219
11/30/2022	Michael J. Malecek	insider	Sell	5,000	$62.28	$311,400.00	243
11/23/2022	Tran Nguyen	CFO	Sell	10,000	$61.09	$610,900.00	3,200
11/18/2022	Karin L. Walker	CAO	Sell	10,000	$57.07	$570,700.00
11/10/2022	Shane Cooke	Director	Sell	5,000	$56.17	$280,850.00
11/7/2022	Richard T Collier	Director	Sell	5,000	$55.62	$278,100.00	1,219
11/1/2022	Lars Ekman	Insider	Sell	15,833	$62.88	$995,579.04	243
10/27/2022	Michael J. Malecek	insider	Sell	20,000	$62.00	$1,240,000.00
10/24/2022	Karin L. Walker	CAO	Sell	20,000	$57.23	$1,144,600.00
10/19/2022	Tran Nguyen	CFO	Sell	10,000	$56.44	$564,400.00	3,200
10/10/2022	Shane Cooke	Director	Sell	5,000	$55.91	$279,550.00
10/5/2022	Richard T Collier	Director	Sell	5,000	$57.92	$289,600.00	1,219
10/3/2022	Hideki Garren	insider	Sell	4,000	$60.90	$243,600.00	243
9/28/2022	Gene G Kinney	CEO	Sell	16,412	$53.38	$876,072.56	12,793
9/28/2022	Lars Ekman	Insider	Sell	31,666	$48.09	$1,522,817.94	243
9/28/2022	Shane Cooke	Director	Sell	10,000	$48.09	$480,900.00	1,219
9/21/2022	Gene G Kinney	CEO	Sell	2,720	$32.02	$87,094.40	12,793
9/21/2022	Tran Nguyen	CFO	Sell	10,000	$30.75	$307,500.00	3,200
9/15/2022	Hideki Garren	insider	Sell	4,000	$30.00	$120,000.00
8/24/2022	Tran Nguyen	CFO	Sell	10,000	$30.17	$301,700.00	3,200
8/17/2022	Gene G Kinney	CEO	Sell	2,181	$32.03	$69,857.43	12,793
8/12/2022	Gene G Kinney	CEO	Sell	20,284	$32.16	$652,333.44	12,793
8/10/2022	Gene G Kinney	CEO	Sell	991	$32.01	$31,721.91	12,793
8/5/2022	Gene G Kinney	CEO	Sell	21,506	$32.83	$706,041.98	12,793
8/1/2022	Hideki Garren	insider	Sell	4,000	$30.52	$122,080.00
7/27/2022	Gene G Kinney	CEO	Sell	376	$32.00	$12,032.00	12,793
7/22/2022	Tran Nguyen	CFO	Sell	7,320	$32.55	$238,266.00	3,200
7/20/2022	Shane Cooke	Director	Sell	15,000	$32.90	$493,500.00
7/20/2022	Tran Nguyen	CFO	Sell	42,120	$32.49	$1,368,478.80	3,200
7/6/2022	Hideki Garren	insider	Sell	8,000	$30.00	$240,000.00
5/5/2022	Ecor1 Capital, Llc	Major Shareholder	Buy	1,062,736	$29.02	$30,840,598.72	11,584,280
4/11/2022	Shane Cooke	Director	Sell	5,000	$35.08	$175,400.00
4/5/2022	Richard T Collier	Director	Sell	5,000	$39.41	$197,050.00	1,219

See Full Table

SEC Filings (Institutional Ownership Changes) for Prothena (NASDAQ:PRTA)

97.08% of Prothena stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

Prothena Institutional Trading History

Reporting Date	Hedge Fund	Shares Held	Market Value	% of Portfolio	Quarterly Change in Shares	Ownership in Company
3/24/2025	Wellington Management Group LLP	5,130,876	$71.06M	0.0%	+22.8%	9.532%
2/17/2025	UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	381,508	$5.28M	0.0%	-27.6%	0.709%
2/17/2025	Two Sigma Investments LP	38,394	$0.53M	0.0%	+265.4%	0.071%
2/17/2025	Rafferty Asset Management LLC	77,672	$1.08M	0.0%	+24.8%	0.144%
2/17/2025	ProShare Advisors LLC	14,524	$0.20M	0.0%	+29.5%	0.027%
2/17/2025	Prosight Management LP	418,122	$5.79M	1.6%	-13.5%	0.777%
2/17/2025	Man Group plc	77,430	$1.07M	0.0%	+90.7%	0.144%
2/17/2025	Millennium Management LLC	123,005	$1.70M	0.0%	+9.3%	0.229%
2/17/2025	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	27,269	$0.38M	0.0%	+6.0%	0.051%
2/17/2025	Deutsche Bank AG	95,970	$1.33M	0.0%	+195.7%	0.178%
2/17/2025	Cresset Asset Management LLC	19,434	$0.27M	0.0%	-20.4%	0.036%
2/17/2025	Cary Street Partners Financial LLC	12,500	$0.17M	0.0%	N/A	0.023%
2/17/2025	Balyasny Asset Management L.P.	38,021	$0.53M	0.0%	N/A	0.071%
2/17/2025	Bank of America Corp DE	119,007	$1.65M	0.0%	+45.0%	0.221%
2/17/2025	BNP Paribas Financial Markets	97,383	$1.35M	0.0%	+74.4%	0.181%
2/14/2025	Boxer Capital Management LLC	690,000	$9.56M	0.8%	N/A	1.282%
2/14/2025	PDT Partners LLC	127,203	$1.76M	0.2%	+15.0%	0.236%
2/14/2025	Northern Trust Corp	404,496	$5.60M	0.0%	+8.5%	0.752%
2/14/2025	The Manufacturers Life Insurance Company	70,184	$0.97M	0.0%	-18.5%	0.130%
2/14/2025	Birchview Capital LP	304,574	$4.22M	3.4%	+45.3%	0.566%
2/14/2025	Susquehanna Fundamental Investments LLC	80,677	$1.12M	0.0%	N/A	0.150%
2/14/2025	Virtus ETF Advisers LLC	5,148	$71K	0.0%	+19.3%	0.010%
2/14/2025	Voya Investment Management LLC	12,829	$0.18M	0.0%	-8.1%	0.024%
2/14/2025	RBF Capital LLC	29,200	$0.40M	0.0%	-35.6%	0.054%
2/14/2025	Price T Rowe Associates Inc. MD	3,685,708	$51.05M	0.0%	-3.6%	6.850%
2/14/2025	Hsbc Holdings PLC	24,179	$0.32M	0.0%	+60.4%	0.045%
2/14/2025	Rock Springs Capital Management LP	644,601	$8.93M	0.3%	+3.1%	1.198%
2/14/2025	Tower Research Capital LLC TRC	16,826	$0.23M	0.0%	+208.3%	0.031%
2/14/2025	Dimensional Fund Advisors LP	864,833	$11.98M	0.0%	+1.3%	1.607%
2/13/2025	XTX Topco Ltd	18,665	$0.26M	0.0%	+19.9%	0.035%
2/13/2025	Mariner LLC	343,917	$4.76M	0.0%	+6.4%	0.639%
2/13/2025	Barclays PLC	105,338	$1.46M	0.0%	+10.6%	0.196%
2/13/2025	Raymond James Financial Inc.	13,111	$0.18M	0.0%	N/A	0.024%
2/13/2025	Renaissance Technologies LLC	201,900	$2.80M	0.0%	+10.4%	0.375%
2/13/2025	Legal & General Group Plc	41,405	$0.57M	0.0%	-3.7%	0.077%
2/13/2025	Invesco Ltd.	42,846	$0.59M	0.0%	+4.0%	0.080%
2/13/2025	FMR LLC	8,071,309	$111.79M	0.0%	+0.1%	15.000%
2/13/2025	Federated Hermes Inc.	746,177	$10.34M	0.0%	+84.3%	1.387%
2/13/2025	Finepoint Capital LP	657,071	$9.10M	0.6%	+51.6%	1.221%
2/13/2025	Wells Fargo & Company MN	52,823	$0.73M	0.0%	-20.2%	0.098%
2/12/2025	Massachusetts Financial Services Co. MA	44,815	$0.62M	0.0%	N/A	0.083%
2/12/2025	Headlands Technologies LLC	7,330	$0.10M	0.0%	+196.5%	0.014%
2/12/2025	Geode Capital Management LLC	964,308	$13.36M	0.0%	+0.1%	1.792%
2/12/2025	Franklin Resources Inc.	19,687	$0.27M	0.0%	N/A	0.037%
2/12/2025	Wellington Management Group LLP	5,130,876	$71.06M	0.0%	+22.8%	9.535%
2/12/2025	Norges Bank	57,454	$0.80M	0.0%	N/A	0.107%
2/12/2025	JPMorgan Chase & Co.	387,350	$5.37M	0.0%	+93.7%	0.720%
2/11/2025	Corebridge Financial Inc.	21,140	$0.29M	0.0%	-7.0%	0.039%
2/11/2025	Vanguard Group Inc.	1,403,838	$19.44M	0.0%	+11.5%	2.609%
2/11/2025	KLP Kapitalforvaltning AS	12,900	$0.18M	0.0%	N/A	0.024%
2/11/2025	American Century Companies Inc.	30,399	$0.42M	0.0%	+66.1%	0.056%
2/11/2025	DCF Advisers LLC	103,500	$1.43M	0.7%	-3.7%	0.192%
2/11/2025	Teacher Retirement System of Texas	10,434	$0.15M	0.0%	N/A	0.019%
2/10/2025	Thrivent Financial for Lutherans	38,626	$0.54M	0.0%	-18.7%	0.072%
2/10/2025	Connor Clark & Lunn Investment Management Ltd.	91,840	$1.27M	0.0%	-25.0%	0.171%
2/7/2025	Amundi	1,954	$28K	0.0%	-85.7%	0.004%
2/7/2025	Foundation Wealth Management LLC	19,471	$0.27M	0.2%	N/A	0.036%
2/6/2025	Raymond James Financial Inc.	13,111	$0.18M	0.0%	N/A	0.024%
2/6/2025	Charles Schwab Investment Management Inc.	327,151	$4.53M	0.0%	+0.7%	0.608%
2/5/2025	Purkiss Capital Advisors LLC	10,729	$0.15M	0.1%	N/A	0.020%
2/4/2025	Bank of New York Mellon Corp	150,238	$2.08M	0.0%	+14.9%	0.279%
2/3/2025	Handelsbanken Fonder AB	20,900	$0.29M	0.0%	+35.7%	0.039%
1/31/2025	HighMark Wealth Management LLC	11,168	$0.16M	0.1%	-32.3%	0.021%
1/30/2025	Rhumbline Advisers	67,115	$0.93M	0.0%	+1.8%	0.125%
1/28/2025	Focused Wealth Management Inc	32,129	$0.45M	0.1%	N/A	0.060%
1/24/2025	China Universal Asset Management Co. Ltd.	11,409	$0.16M	0.0%	+10.3%	0.021%
1/24/2025	Chicago Partners Investment Group LLC	11,197	$0.16M	0.0%	N/A	0.021%
1/21/2025	Duncan Williams Asset Management LLC	69,199	$0.96M	0.4%	+41.9%	0.129%
1/17/2025	SG Americas Securities LLC	37,612	$0.52M	0.0%	+167.0%	0.070%
1/15/2025	Hennion & Walsh Asset Management Inc.	52,284	$0.72M	0.0%	N/A	0.097%
12/26/2024	JPMorgan Chase & Co.	199,986	$3.35M	0.0%	-32.4%	0.372%
11/19/2024	Barclays PLC	95,222	$1.59M	0.0%	+110.2%	0.177%
11/16/2024	Geode Capital Management LLC	963,479	$16.12M	0.0%	-3.1%	1.792%
11/15/2024	Barclays PLC	95,222	$1.59M	0.0%	+110.2%	0.177%
11/15/2024	Orion Portfolio Solutions LLC	17,531	$0.29M	0.0%	+4.4%	0.033%
11/15/2024	XTX Topco Ltd	15,564	$0.26M	0.0%	N/A	0.029%
11/15/2024	Wellington Management Group LLP	4,178,788	$69.91M	0.0%	+14.8%	7.770%
11/15/2024	State Street Corp	1,674,909	$28.02M	0.0%	-13.3%	3.114%
11/15/2024	Systematic Financial Management LP	8,125	$0.14M	0.0%	-95.8%	0.015%
11/15/2024	Janus Henderson Group PLC	18,047	$0.30M	0.0%	-98.2%	0.034%
11/14/2024	PDT Partners LLC	110,654	$1.85M	0.2%	+7.7%	0.206%
11/14/2024	UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	526,748	$8.81M	0.0%	+1,122.9%	0.979%
11/13/2024	BNP Paribas Financial Markets	55,842	$0.93M	0.0%	+44.6%	0.104%
11/13/2024	FMR LLC	8,066,983	$134.96M	0.0%	+0.0%	15.000%
11/13/2024	The Manufacturers Life Insurance Company	86,071	$1.44M	0.0%	+3.8%	0.160%
11/13/2024	Dynamic Technology Lab Private Ltd	25,764	$0.43M	0.0%	N/A	0.048%
11/12/2024	Algert Global LLC	72,961	$1.22M	0.0%	-5.5%	0.136%
11/12/2024	Charles Schwab Investment Management Inc.	324,962	$5.44M	0.0%	-0.7%	0.604%
11/9/2024	Primecap Management Co. CA	35,500	$0.59M	0.0%	-2.7%	0.066%
11/9/2024	Intech Investment Management LLC	12,555	$0.21M	0.0%	N/A	0.023%
11/8/2024	Connor Clark & Lunn Investment Management Ltd.	122,492	$2.05M	0.0%	+8.6%	0.228%
11/5/2024	GSA Capital Partners LLP	28,941	$0.48M	0.0%	N/A	0.054%
10/25/2024	Pinnacle Associates Ltd.	125,747	$2.10M	0.0%	+2.3%	0.234%
10/25/2024	China Universal Asset Management Co. Ltd.	10,344	$0.17M	0.0%	+63.7%	0.019%
10/11/2024	Creative Planning	20,907	$0.35M	0.0%	N/A	0.039%
10/3/2024	Duncan Williams Asset Management LLC	48,749	$0.82M	0.4%	N/A	0.091%
10/3/2024	SG Americas Securities LLC	14,087	$0.24M	0.0%	-74.2%	0.026%
8/16/2024	Systematic Financial Management LP	193,763	$4M	0.1%	+25.8%	0.360%
8/16/2024	Algert Global LLC	77,191	$1.59M	0.1%	+59.7%	0.144%
8/15/2024	Armistice Capital LLC	1,560,000	$32.20M	0.4%	+42.3%	2.901%

Data available starting January 2016

See Full Table

Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation in the United States. The company is involved in developing birtamimab, an investigational humanized antibody that is in Phase III clinical trial for the treatment of AL amyloidosis; Prasinezumab, a humanized monoclonal antibody, for the treatment of Parkinson's disease and other related synucleinopathies which is in Phase IIb clinical trial; NNC6019 that is in Phase lI clinical trial for the treatment of ATTR amyloidosis; and BMS-986446 and PRX012, which is in Phase I clinical trial for the treatment of Alzheimer's disease. Its discovery and preclinical programs include PRX123, a dual Aß-Tau vaccine for the treatment and prevention of Alzheimer's disease; and PRX019 for the treatment of neurogenerative diseases, as well as TDP-43 for the treatment of amyotrophic lateral sclerosis. Prothena Corporation plc has a license, development, and commercialization agreement with F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. to develop and commercialize antibodies that target a-synuclein, including prasinezumab; and a collaboration agreement with Bristol-Myers Squibb to develop and commercialize antibodies targeting tau, TDP-43. The company was incorporated in 2012 and is based in Dublin, Ireland.

Today's Range

Now: $11.32

$11.11

$11.84

50 Day Range

MA: $14.11

$11.32

$16.04

52 Week Range

Now: $11.32

$11.12

$25.42

Volume

456,544 shs

Average Volume

490,748 shs

Market Capitalization

$609.32 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

N/A

Who are the company insiders with the largest holdings of Prothena?: Prothena's top insider shareholders include:
Gene G Kinney (CEO)
Tran Nguyen (CFO)
Dennis J Selkoe (Director)
Brandon S Smith (COO)
Carol D Karp (Insider)
Hideki Garren (Insider)
Karin L Walker (CAO)
Michael J Malecek (Insider)
Wagner M Zago (Insider)
Learn More about top insider investors at Prothena.