Prothena Corporation plc (PRTA)

NASDAQ: PRTA · Real-Time Price · USD

8.12

-0.29 (-3.45%)

Jul 31, 2026, 4:00 PM EDT - Market closed

Prothena Corporation Financials Overview

Financials in millions USD. Fiscal year is January - December.

Millions USD. Fiscal year is Jan - Dec.

Revenue & Profits

Fiscal Year	TTM	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Mar '26 Mar 31, 2026	Dec '25 Dec 31, 2025	Dec '24 Dec 31, 2024	Dec '23 Dec 31, 2023	Dec '22 Dec 31, 2022	Dec '21 Dec 31, 2021
Revenue	57.94	9.68	135.16	91.37	53.91	200.58
Revenue Growth	-57.99%	-92.84%	47.92%	69.50%	-73.13%	23414.30%
Gross Profit	57.94	9.68	135.16	91.37	53.91	200.58
Operating Income	-119.02	-214.64	-154.56	-191.04	-131.56	71.98
Net Income	-151.18	-244.09	-122.31	-147.03	-116.95	66.98
Earnings Per Share	-2.82	-4.53	-2.27	-2.76	-2.47	1.38
EPS Growth	-	-	-	-	-	-

Cash & Debt

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Mar '26 Mar 31, 2026	Dec '25 Dec 31, 2025	Dec '24 Dec 31, 2024	Dec '23 Dec 31, 2023	Dec '22 Dec 31, 2022	Dec '21 Dec 31, 2021
Cash & Investments	329.46	307.53	471.39	618.83	710.41	579.09
Total Debt	7.65	8.37	10.84	11.84	6.47	12.33
Net Cash (Debt)	321.81	299.16	460.55	607	703.93	566.77
Net Cash Growth	-21.07%	-35.04%	-24.13%	-13.77%	24.20%	104.21%
Net Cash Per Share	5.97	5.56	8.56	11.41	14.86	11.69

Cash Flow & CapEx

Fiscal Year	TTM	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Mar '26 Mar 31, 2026	Dec '25 Dec 31, 2025	Dec '24 Dec 31, 2024	Dec '23 Dec 31, 2023	Dec '22 Dec 31, 2022	Dec '21 Dec 31, 2021
Operating Cash Flow	-81.34	-163.58	-150.05	-133.91	-108.82	92.61
Capital Expenditures	-0.1	-0.14	-0.3	-2.81	-0.46	-0.58
Free Cash Flow	-81.44	-163.72	-150.35	-136.72	-109.29	92.03
Free Cash Flow Growth	-	-	-	-	-	-

Margins

Fiscal Year	TTM	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Mar '26 Mar 31, 2026	Dec '25 Dec 31, 2025	Dec '24 Dec 31, 2024	Dec '23 Dec 31, 2023	Dec '22 Dec 31, 2022	Dec '21 Dec 31, 2021
Gross Margin	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%
Operating Margin	-205.43%	-2216.44%	-114.36%	-209.08%	-244.05%	35.88%
Pretax Margin	-184.21%	-2073.82%	-95.39%	-175.64%	-233.01%	35.86%
Profit Margin	-260.92%	-2520.57%	-90.49%	-160.92%	-216.95%	33.39%
FCF Margin	-140.55%	-1690.60%	-111.24%	-149.63%	-202.74%	45.88%

Valuation

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Aug '26 Aug 3, 2026	Dec '25 Dec 31, 2025	Dec '24 Dec 31, 2024	Dec '23 Dec 31, 2023	Dec '22 Dec 31, 2022	Dec '21 Dec 31, 2021
PE Ratio	-	-	-	-	-	35.80
Forward PE	-	88.34	49.76	49.76	49.76	49.76
P/FCF Ratio	-	-	-	-	-	25.05
PS Ratio	7.34	53.09	5.52	21.35	58.24	11.49