Prothena Corporation plc (PRTA) P/E Ratio

PE Ratio

N/A

January 9, 2026

Summary

Status: PRTA PE ratio is unknown

Chart

Performance

PRTA Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
PE Ratio	Jan 9, 26	-	–	–	–	–	–	–	–
Price	Jan 9, 26	$9.19	+1.6%	-10.9%	-10.8%	-3.8%	-35.1%	-82.5%	-28.3%
TTM Revenue	Sep 30, 25	$11.79M	+14.0%	–	+14.0%	–	-91.2%	+128.7%	+1473.6%
TTM EPS	Sep 30, 25	-$5.21	+7.4%	–	+7.4%	–	-109.8%	-55.9%	-103.9%
	Jan 9, 26	1.68	+1.8%	-10.6%	-10.6%	-3.5%	+7.0%	-61.7%	-39.6%
	Jan 9, 26	41.97	+1.6%	-10.9%	-10.8%	-3.8%	+644.1%	-17.2%	-93.0%
	Jan 9, 26	$172.94M	+4.6%	-26.0%	-25.7%	-10.1%	-42.7%	-91.5%	-25.8%
	Jan 9, 26	-0.79	-4.0%	+26.2%	+25.5%	+10.2%	+60.5%	+95.1%	+64.1%
Market Cap	Jan 9, 26	$495M	+1.6%	-10.9%	-10.8%	-3.8%	-35.1%	-81.9%	-3.3%

Highs

PRTA PE Ratio Highs Comparison
Period	High	Date	Current
1M	N/A	N/A	N/A
3M	N/A	N/A	N/A
6M	N/A	N/A	N/A
1Y	N/A	N/A	N/A
3Y	N/A	N/A	N/A
5Y	70.82	Oct 7, 21	N/A
All	70.82	Oct 7, 21	N/A

Lows

PRTA PE Ratio Lows Comparison
Period	Low	Date	Current
1M	N/A	N/A	N/A
3M	N/A	N/A	N/A
6M	N/A	N/A	N/A
1Y	N/A	N/A	N/A
3Y	N/A	N/A	N/A
5Y	18.50	Jun 13, 22	N/A
All	18.50	Jun 13, 22	N/A

History

Date	Value	Change
Dec 31, 2021	45.21	-

FAQ

What is the current PE ratio of PRTA?
PRTA PE ratio is unknown
What is PRTA PE ratio 1-year high?
PRTA PE ratio 1-year high is unknown
What is PRTA PE ratio 1-year low?
PRTA PE ratio 1-year low is unknown
What is 1-year change in PRTA PE ratio?
PRTA PE ratio 1-year change is unknown
What is 3-year change in PRTA PE ratio?
PRTA PE ratio 3-year change is unknown
How far is PRTA PE ratio from its all-time high?
PRTA PE ratio vs all-time high is unknown

PE Ratio Formula

P/E =

Data Sources & References

PRTA Official Website www.prothena.com
Most Recent Quarterly Report (10-Q) www.sec.gov/Archives/edgar/data/1559053/000155905325000044/0001559053-25-000044-index.htm
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/1559053/000155905325000009/0001559053-25-000009-index.htm
PRTA Profile on Yahoo Finance finance.yahoo.com/quote/PRTA
PRTA Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/prta