Rock Springs Capital Management LP Prothena Corp Public LTD CO Transaction History

Rock Springs Capital Management LP

$1.5 Billion
Q3 2025

A detailed history of Rock Springs Capital Management LP transactions in Prothena Corp Public LTD CO stock. As of the latest transaction made, Rock Springs Capital Management LP holds 25,398 shares of PRTA stock, worth $260,329. This represents 0.02% of its overall portfolio holdings.

Number of Shares

25,398

Previous 492,601 94.84%

Holding current value

$260,329

Previous $2.99 Million 91.74%

% of portfolio

0.02%

Previous 0.2%

19 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 14, 2025	SELL	$6.22 - $9.76 $2.91 Million - $4.56 Million	-467,203 Reduced 94.84%	25,398 $247,000
Q1 2025 May 15, 2025	SELL	$12.38 - $16.04 $1.88 Million - $2.44 Million	-152,000 Reduced 23.58%	492,601 $6.1 Million
Q4 2024 Feb 14, 2025	BUY	$11.95 - $18.35 $233,658 - $358,797	19,553 Added 3.13%	644,601 $8.93 Million
Q4 2023 Feb 14, 2024	BUY	$32.31 - $52.32 $347,332 - $562,440	10,750 Added 1.75%	625,048 $22.7 Million
Q3 2023 Nov 14, 2023	SELL	$47.3 - $70.6 $6.58 Million - $9.82 Million	-139,164 Reduced 18.47%	614,298 $29.6 Million

Q4 2022 Feb 14, 2023	BUY	$52.05 - $65.0 $3.9 Million - $4.88 Million	75,000 Added 11.05%	753,462 $45.4 Million
Q2 2022 Aug 15, 2022	BUY	$22.73 - $39.98 $339,404 - $596,981	14,932 Added 2.25%	678,462 $18.4 Million
Q1 2022 May 16, 2022	BUY	$30.27 - $49.22 $478,266 - $777,676	15,800 Added 2.44%	663,530 $24.3 Million
Q4 2021 Feb 14, 2022	SELL	$42.11 - $73.26 $2.64 Million - $4.59 Million	-62,700 Reduced 8.83%	647,730 $32 Million
Q3 2021 Nov 15, 2021	SELL	$48.2 - $78.89 $11.6 Million - $18.9 Million	-239,661 Reduced 25.23%	710,430 $50.6 Million
Q2 2021 Aug 16, 2021	SELL	$21.63 - $57.65 $4.47 Million - $11.9 Million	-206,809 Reduced 17.88%	950,091 $48.8 Million
Q1 2021 May 17, 2021	BUY	$11.0 - $28.24 $173,800 - $446,192	15,800 Added 1.38%	1,156,900 $29.1 Million
Q4 2020 Feb 16, 2021	BUY	$10.12 - $13.94 $1.17 Million - $1.62 Million	115,893 Added 11.3%	1,141,100 $13.7 Million
Q3 2020 Nov 16, 2020	BUY	$9.93 - $13.47 $357,370 - $484,771	35,989 Added 3.64%	1,025,207 $10.2 Million
Q2 2020 Aug 14, 2020	BUY	$9.56 - $12.51 $4.68 Million - $6.12 Million	489,218 Added 97.84%	989,218 $10.3 Million
Q1 2020 May 15, 2020	BUY	$7.54 - $15.77 $1.37 Million - $2.86 Million	181,500 Added 56.99%	500,000 $5.35 Million
Q1 2018 May 15, 2018	BUY	$27.95 - $45.04 $237,575 - $382,840	8,500 Added 2.74%	318,500 $11.7 Million
Q4 2017 Feb 14, 2018	BUY	$35.44 - $63.76 $17,720 - $31,880	500 Added 0.16%	310,000 $11.6 Million
Q3 2017 Nov 14, 2017	BUY	$53.83 - $67.75 $16.7 Million - $21 Million	309,500	309,500 $20 Million

Others Institutions Holding PRTA

# of Institutions

217

Shares Held

34.9M

Call Options Held

656K

Put Options Held

1.12M

View Full List

About PROTHENA CORP PUBLIC LTD CO

Ticker PRTA
Exchange NASDAQ
Sector Healthcare
Industry Biotechnology
Shares Outstandng 46,922,800
Market Cap $481M
Description
Prothena Corporation plc, a late-stage clinical company, focuses on discovery and development of novel therapies for life-threatening diseases 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 human...

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Rock Springs Capital Management LP Prothena Corp Public LTD CO Transaction History