Prothena Corporation plc (PRTA)

Prothena Corporation Ratios and Metrics

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

Fiscal Year	Current	FY 2024	FY 2023	FY 2022	FY 2021	FY 2020
Period Ending	Feb 19, 2026	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Market Capitalization	488	745	1,950	3,111	2,302	479
Market Cap Growth	-32.53%	-61.79%	-37.30%	35.14%	380.07%	-24.08%
Enterprise Value	166	237	1,290	2,623	1,715	184
Last Close Price	9.09	13.85	36.34	60.25	49.40	12.01
PE Ratio	-	-	-	-	34.37	-
PS Ratio	41.40	5.51	21.34	57.70	11.48	562.08
PB Ratio	1.66	1.53	3.47	5.00	4.94	2.61
P/TBV Ratio	1.65	1.53	3.47	5.00	4.94	2.61
P/FCF Ratio	-	-	-	-	25.01	-
P/OCF Ratio	-	-	-	-	24.86	-
EV/Sales Ratio	14.10	1.76	14.12	48.66	8.55	215.82
EV/EBITDA Ratio	-	-	-	-	23.47	-
EV/EBIT Ratio	-	-	-	-	23.83	-
EV/FCF Ratio	-	-	-	-	18.64	-
Debt / Equity Ratio	0.03	0.02	0.02	0.01	0.03	0.10
Debt / EBITDA Ratio	-	-	-	-	0.16	-
Debt / FCF Ratio	-	-	-	-	0.13	-
Net Debt / Equity Ratio	-1.09	-0.95	-1.08	-1.13	-1.22	-1.51
Net Debt / EBITDA Ratio	1.45	3.00	3.19	5.38	-7.75	2.50
Net Debt / FCF Ratio	1.71	3.06	4.44	6.44	-6.16	3.45
Asset Turnover	0.03	0.22	0.13	0.08	0.43	0.00
Quick Ratio	6.43	9.72	10.97	14.17	17.31	11.43
Current Ratio	6.61	10.01	11.24	14.34	17.48	11.58
Return on Equity (ROE)	-67.63%	-23.34%	-24.85%	-21.50%	20.61%	-48.65%
Return on Assets (ROA)	-29.31%	-15.54%	-16.42%	-12.03%	9.55%	-18.73%
Return on Capital Employed (ROCE)	-73.80%	-31.00%	-29.90%	-18.60%	12.50%	-36.70%
Earnings Yield	-57.47%	-16.41%	-7.54%	-3.76%	2.91%	-23.18%
FCF Yield	-38.57%	-20.17%	-7.01%	-3.51%	4.00%	-16.80%
Buyback Yield / Dilution	-0.17%	-1.04%	-12.34%	2.26%	-21.42%	-0.08%

Updated Nov 6, 2025. Source: S&P Global Market Intelligence. Standard template. Financial Sources.

SEC Filings: 10-K · 10-Q