Market Cap

Prothena Corporation plc Market Capitalization:

$495.2 Million

USD as of Jan. 1, 2026

business Prothena Corporation plc Company Profile

Prothena Corporation plc Main Stock Listing

NASDAQ: PRTA

Market Capitalization History of Prothena Corporation plc

Market capitalizations are calculated from the opening stock price at the beginning of each month.

Top Competitors by Market Capitalization

Industry: Biotechnology
Company Market Cap (USD)
Novo Nordisk $158.96 B
Vertex Pharmaceuticals Incorporated $115.92 B
CSL Limited $95.75 B
Regeneron Pharmaceuticals, Inc. $82.28 B
Marinomed Biotech AG $70.11 B
Sector: Healthcare
Company Market Cap (USD)
Lilly $968.50 B
Johnson & Johnson $499.57 B
AbbVie $405.28 B
Roche $332.12 B
UnitedHealth Group $304.72 B

Yearly evolution of Prothena Corporation plc market cap

Date Market Cap YoY Change
Jan. 1, 2026 $495.2 M -40.54%
Jan. 1, 2025 $833.0 M -61.57%
Jan. 1, 2024 $2.17 B -21.21%
Jan. 1, 2023 $2.75 B 59.64%
Jan. 1, 2022 $1.72 B 204.01%
Jan. 1, 2021 $566.9 M -7.89%
Jan. 1, 2020 $615.4 M 3.57%
Jan. 1, 2019 $594.2 M -71.89%
Jan. 1, 2018 $2.11 B -14.62%
Jan. 1, 2017 $2.48 B 25.70%
Jan. 1, 2016 $1.97 B 72.12%
Jan. 1, 2015 $1.14 B -26.86%
Jan. 1, 2014 $1.56 B 414.81%
Jan. 1, 2013 $303.9 M

Market capitalization is calculated from the opening stock price at the beginning of each year.

Prothena Corporation plc Categories

Ireland languages Healthcare languages Biotechnology
Ireland Healthcare Ireland Biotechnology

Stocks & Indices

Prothena Corporation plc has the following listings and related stock indices.


Stock: NASDAQ: PRTA

Stock: FSX: 0PT

What is a company's market capitalization?

The market capitalization of a company, more simply referred to as "market cap", is the total market value of a publicly traded company's outstanding shares. It is often considered as a key indicator of what a company is worth.