Prothena Corporation plc (PRTA)

Prothena Corporation Employees

Prothena Corporation had 67 employees as of December 31, 2025. The number of employees decreased by 96 or 58.90% compared to the previous year. That makes Prothena Corporation the 33,812th largest employer in the world and 4,457th in the United States.

• Employees: 67
• Change (1Y): -96
• Growth (1Y): -58.90%
• Revenue / Employee: $813,881
• Profits / Employee: -$656,597
• Market Cap: 420.96M

Employees Chart

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Employees History

Date	Employees	Change (1Y)	Growth (1Y)
Dec 31, 2025	67	-96	-58.90%
Dec 31, 2024	163	-10	-5.78%
Dec 31, 2023	173	46	36.22%
Dec 31, 2022	127	45	54.88%
Dec 31, 2021	82	16	24.24%

Data Source: S&P Global Market Intelligence Last updated: Dec 31, 2025

Employee data is provided by S&P Global Market Intelligence and updates once per year after the filing of each annual report.

Update frequency:

Yearly

Last checked:

Oct 16, 2026

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