Prothena Corporation plc

PRTANASDAQHealthcare● Active

$8.56

$-0.23(-2.62%)

Market Cap$448143709

P/E Ratio—

52W High$11.8

52W Low$4.76

Avg Volume521K

Open$8.80

Beta-0.32

Employees Ownership Insider Trades

Prothena Corporation plc (PRTA) Number of Employees – History & Annual Headcount

Annual SEC headcount, year-over-year change, and per-employee efficiency — chart and full history below.

SEC EDGAR · FMP · PRTA · as of Feb 27, 2026

Latest filing snapshot

100

-63-38.65%vs prior year

Prothena Corporation plc (PRTA) employee data is sourced from the annual SEC 10-K filing. As of 2025, full-time employees only. Global consolidated headcount. View SEC filing ↗

SEC 10-K·Period end: 2025-12-31·Full-time · Global

Total Employees

100

Change (1Y)

-63

Growth % (1Y)

-38.65%

Revenue / Employee

$96.8K

Net Income / Employee

$-2.44M

Market Cap

$448M

PRTA Employee Count

2012 – 2025 · Annual · SEC filing

Source: SEC annual filings · Hover bar to view year data · Click to view original filing

Employees History

Filing Date	Period End	Employees	Change (1Y)	Growth (1Y)
2026-02-27	2025-12-31	100	-63	-38.65%
2025-02-27	2024-12-31	163	-10	-5.78%
2024-02-22	2023-12-31	173	+46	+36.22%
2023-02-28	2022-12-31	127	+45	+54.88%
2022-02-25	2021-12-31	82	+16	+24.24%
2021-02-26	2020-12-31	66	+15	+29.41%
2020-03-03	2019-12-31	51	-8	-13.56%
2019-03-15	2018-12-31	59	-66	-52.80%
2018-02-26	2017-12-31	125	+29	+30.21%
2017-02-27	2016-12-31	96	+30	+45.45%

▸ Source: SEC Annual Reports (Form 10-K / 20-F). Employee counts as of fiscal year end. Click the ↗ icon at the end of a row to open the original SEC filing in a new tab.

Related Companies — Employee Count

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KALV

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PRTA

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Source: /stock-peers + /profile.fullTimeEmployees · Click row → /employees · Sorted by headcount · PRTA peer comparison

About PRTA employees

PRTA Employees · Headcount

Prothena Corporation plc (PRTA) employee data is sourced from the annual SEC 10-K filing. As of 2025, Prothena Corporation plc had 100 full-time employees globally. Full-time employees only. Global consolidated headcount.

Prothena Corporation plc employs 100 full-time employees as of the latest filing within the Biotechnology industry. Revenue per employee stands at $96,840, reflecting the company's operational efficiency.

Prothena Corporation plc's workforce decreased by 63 (38.65%) in 2025 compared to the prior fiscal year. The historical trend reflects the company's expansion and contraction cycles.

Prothena Corporation plc's revenue per employee of $96,840 positions it among the notable performers in the Biotechnology sector for operational efficiency.

Revenue Financial statements Net income SEC filings Price history Forecast & ratings Ownership Earnings

Frequently Asked Questions

PRTA Employees · 5 questions

As of the latest SEC 10-K filing (2025), Prothena Corporation plc had 100 full-time employees globally. This figure is sourced from the company's mandatory annual disclosure to the SEC.

Prothena Corporation plc employee counthow many employees does Prothena Corporation plc havePRTA total employees 2025

▸ Data source: FMP /historical-employee-count · SEC EDGAR annual filings · As reported · Global consolidated headcount · As of 2026-02-27