Prothena Corporation plc (PRTA)

NASDAQ: PRTA · Real-Time Price · USD

8.87

-0.15 (-1.66%)

At close: Sep 11, 2026, 4:00 PM EDT

8.93

+0.06 (0.68%)

After-hours: Sep 11, 2026, 7:30 PM EDT

Prothena Corporation Ratios and Metrics

Market cap in millions USD. Fiscal year is January - December.

Millions USD. Fiscal year is Jan - Dec.

Total Valuation

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Sep '26 Sep 11, 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
Market Capitalization	458	514	745	1,950	3,111	2,302
Market Cap Growth	2.54%	-31.02%	-61.79%	-37.30%	35.14%	380.07%
Enterprise Value	177	192	237	1,290	2,623	1,715
Last Close Price	8.93	9.55	13.85	36.34	60.25	49.40

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Sep '26 Sep 11, 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	-	-	-	-	-	34.37
Forward PE	-	88.34	49.76	49.76	49.76	49.76
PS Ratio	8.41	53.09	5.51	21.34	57.70	11.48
PB Ratio	1.61	1.83	1.53	3.47	5.00	4.94
P/TBV Ratio	1.60	1.83	1.53	3.47	5.00	4.94
P/FCF Ratio	-	-	-	-	-	25.01
P/OCF Ratio	-	-	-	-	-	24.86

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Sep '26 Sep 11, 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
EV/Sales Ratio	3.25	19.86	1.76	14.12	48.66	8.55
EV/EBITDA Ratio	-	-	-	-	-	23.47
EV/EBIT Ratio	-	-	-	-	-	23.83
EV/FCF Ratio	-	-	-	-	-	18.64

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Sep '26 Sep 11, 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
Debt / Equity Ratio	0.02	0.03	0.02	0.02	0.01	0.03
Debt / EBITDA Ratio	-	-	-	-	-	0.16
Debt / FCF Ratio	-	-	-	-	-	0.13
Net Debt / Equity Ratio	-0.98	-1.07	-0.95	-1.08	-1.13	-1.22
Net Debt / EBITDA Ratio	4.76	1.63	3.00	3.19	5.38	-7.75
Net Debt / FCF Ratio	4.63	1.83	3.06	4.44	6.44	-6.16
Asset Turnover	0.16	0.02	0.22	0.13	0.08	0.43
Quick Ratio	24.72	7.53	9.72	10.97	14.17	17.31
Current Ratio	25.05	7.72	10.01	11.24	14.34	17.48
Return on Equity (ROE)	-14.39%	-63.62%	-23.34%	-24.85%	-21.50%	20.61%
Return on Assets (ROA)	-10.67%	-26.40%	-15.54%	-16.42%	-12.03%	9.55%
Return on Invested Capital (ROIC)	-	-4795.64%	-	-	-	-
Return on Capital Employed (ROCE)	-20.60%	-64.50%	-31.00%	-29.90%	-18.60%	12.50%

Fiscal Year	Current	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021
Period Ending	Sep '26 Sep 11, 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
Earnings Yield	-9.60%	-47.48%	-16.41%	-7.54%	-3.76%	2.91%
FCF Yield	-13.24%	-31.85%	-20.17%	-7.01%	-3.51%	4.00%
Buyback Yield / Dilution	0.82%	-0.11%	-1.04%	-12.34%	2.26%	-21.42%

SEC Filings: 10-K · 10-Q