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Wednesday 4 November 2026
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Prothena Corporation plc
PRTA Healthcare Biotechnology
Prothena Corporation plc’s revenue for fiscal 2025 (year ended December 2025) was $9.7 million, down 92.8% from fiscal 2024.
- Revenue
- −77.2%
- EPS
- +84.6%
- Free cash flow
- +44.6%
Quarter to June 2026, against a year earlier
8.38
0.17
+2.07%
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| Dec '16 | Dec '17 | Dec '18 | Dec '19 | Dec '20 | Dec '21 | Dec '22 | Dec '23 | Dec '24 | Dec '25 | |
|---|---|---|---|---|---|---|---|---|---|---|
Piotroski F-Score |
2 | 5 | 4 | 3 | 3 | 7 | 2 | 3 | 3 | 2 |
P/E ratio |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 35.54 | 0.00 | 0.00 | 0.00 | 0.00 |
P/S ratio |
1,621.17 | 51.72 | 426.66 | 775.59 | 561.99 | 10.89 | 47.01 | 22.45 | 5.51 | 53.08 |
Altman Z-Score |
9.61 | 8.22 | (0.33) | 0.70 | (1.49) | 9.31 | 11.61 | 6.85 | 4.88 | (0.24) |
P/FCF ratio |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 23.74 | 0.00 | 0.00 | 0.00 | 0.00 |
Altman Z″-Score (non-manufacturers) |
4.67 | 4.93 | 1.36 | 1.00 | (3.26) | 6.31 | 5.84 | 3.42 | 5.27 | (5.98) |
P/Operating CF |
(50.59) | (36.01) | (19.17) | (43.58) | (25.11) | (97.29) | (509.29) | (40.18) | (15.59) | (22.05) |
Beneish M-Score |
(3.14) | 19.06 | (9.25) | 33.47 | (3.87) | — | — | — | — | — |
P/B ratio |
4.68 | 3.50 | 1.26 | 2.31 | 2.61 | 4.69 | 4.07 | 3.65 | 1.53 | 1.83 |
Price to Tangible BV |
4.68 | 3.50 | 1.26 | 2.31 | 2.61 | 4.69 | 4.07 | 3.65 | 1.53 | 1.83 |
EV/Sales |
1,254.42 | 36.55 | (21.15) | 314.02 | 214.12 | 8.01 | 33.83 | 15.66 | 2.02 | 21.33 |
EV/EBITDA |
0.00 | 0.00 | 0.13 | 0.00 | 0.00 | 20.38 | 0.00 | 0.00 | 0.00 | 0.00 |
EV/Operating CF |
(11.38) | (7.67) | 0.71 | (4.83) | (2.27) | 17.34 | (16.76) | (10.68) | (1.82) | (1.26) |
EV/FCF |
(9.96) | (7.47) | 0.67 | (4.78) | (2.27) | 17.45 | (16.69) | (10.47) | (1.82) | (1.26) |
Quick Ratio |
9.42 | 11.18 | 28.65 | 21.21 | 11.48 | 17.31 | 14.17 | 10.99 | 9.72 | 7.53 |
Current Ratio |
9.53 | 11.41 | 28.90 | 21.36 | 11.58 | 17.48 | 14.34 | 11.24 | 10.01 | 7.72 |
Net Debt/EBITDA |
2.46 | 2.74 | 2.75 | 4.76 | 2.81 | (7.35) | 5.69 | 3.40 | 3.12 | 1.46 |
Debt/Assets |
0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Debt/Equity |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Asset Turnover |
0.00 | 0.06 | 0.00 | 0.00 | 0.00 | 0.43 | 0.08 | 0.13 | 0.22 | 0.02 |
Operating CF/Net income |
0.73 | 0.86 | 0.18 | 0.68 | 0.72 | 1.38 | 0.93 | 0.91 | 1.23 | 0.67 |
Capex/Depreciation |
(6.86) | (1.15) | (0.54) | (0.08) | (0.03) | (0.08) | (0.07) | (0.33) | (0.08) | (0.04) |
| (44.10%) | (39.67%) | (42.63%) | (26.07%) | (48.65%) | 20.61% | (21.50%) | (24.85%) | (23.34%) | (63.62%) | |
| (37.89%) | (32.05%) | (31.28%) | (16.92%) | (29.55%) | 14.21% | (17.11%) | (20.22%) | (19.67%) | (55.86%) | |
ROIC |
0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | (621.71%) | 0.00% |
Return on Tangible Assets |
(39.36%) | (34.52%) | (33.17%) | (21.31%) | (40.27%) | 12.10% | (17.44%) | (25.08%) | (27.80%) | (88.28%) |
Average Days of Receivables |
61.58 | 3.18 | 0.76 | 30.49 | 6.42 | 0.00 | 0.00 | 20.61 | 0.00 | 0.00 |
Research and Development Expense of Revenue |
11,330.24% | 488.92% | 10,595.08% | 6,245.21% | 8,778.90% | 41.02% | 251.48% | 241.40% | 164.64% | 1,392.52% |
Selling, General and Administrative Expense of Revenue |
3,891.56% | 175.25% | 4,448.38% | 4,390.17% | 4,537.28% | 23.09% | 92.57% | 67.68% | 49.72% | 613.30% |
Intangible Assets out of Total Assets |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Share Based Compensation of Revenue |
2,362.94% | 97.26% | 2,729.01% | 2,897.42% | 2,580.77% | 12.29% | 58.11% | 44.78% | 34.01% | 388.68% |
Graham Net Nets |
0.17 | 0.24 | 0.63 | 0.37 | 0.31 | 0.20 | 0.23 | 0.25 | 0.57 | 0.52 |
Graham Number |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 18.15 | 0.00 | 0.00 | 0.00 | 0.00 |
Earnings Yield |
(9.36%) | (10.74%) | (38.25%) | (12.32%) | (23.23%) | 2.81% | (4.67%) | (7.19%) | (16.46%) | (47.54%) |
Free Cash Flow Yield |
(7.77%) | (9.46%) | (7.36%) | (8.48%) | (16.80%) | 4.21% | (4.31%) | (6.66%) | (20.19%) | (31.85%) |
Revenue per Share |
0.03 | 0.73 | 0.02 | 0.02 | 0.02 | 4.54 | 1.14 | 1.72 | 2.51 | 0.18 |
Operating CF per Share |
(3.38) | (3.48) | (0.71) | (1.33) | (2.01) | 2.09 | (2.30) | (2.52) | (2.79) | (3.04) |
Capex per Share |
(0.48) | (0.09) | (0.04) | (0.01) | 0.00 | (0.01) | (0.01) | (0.05) | (0.01) | 0.00 |
Free Cash Flow per Share |
(3.87) | (3.58) | (0.76) | (1.34) | (2.02) | 2.08 | (2.31) | (2.57) | (2.80) | (3.04) |
Cash per Share |
11.26 | 11.09 | 10.81 | 9.42 | 7.43 | 13.09 | 15.00 | 11.65 | 8.77 | 5.71 |
Shareholders Equity per Share |
10.64 | 10.81 | 8.17 | 6.84 | 4.61 | 10.54 | 13.13 | 10.55 | 9.06 | 5.21 |
Interest Debt per Share |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Book value per Share |
10.64 | 10.81 | 8.17 | 6.84 | 4.61 | 10.54 | 13.13 | 10.55 | 9.06 | 5.21 |
Free Cash Flow |
(132.89) | (134.70) | (30.00) | (53.52) | (80.56) | 92.03 | (109.28) | (136.68) | (150.35) | (163.72) |
Working Capital |
350.29 | 388.96 | 416.46 | 360.66 | 273.44 | 551.36 | 668.95 | 582.39 | 436.91 | 274.35 |
Capital Expenditures |
(16.64) | (3.52) | (1.73) | (0.55) | (0.20) | (0.57) | (0.46) | (2.77) | (0.30) | (0.14) |
Net Current Asset Value |
296.79 | 337.19 | 255.59 | 232.03 | 150.32 | 441.49 | 583.11 | 504.27 | 425.23 | 268.86 |
EV/EBIT |
0.00 | 0.00 | 0.13 | 0.00 | 0.00 | 22.31 | 0.00 | 0.00 | 0.00 | 0.00 |
Capex to Sales |
15.78 | 0.13 | 1.81 | 0.67 | 0.23 | 0.00 | 0.01 | 0.03 | 0.00 | 0.01 |
Price to Operating Income |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 30.36 | 0.00 | 0.00 | 0.00 | 0.00 |
| Other line items | ||||||||||
Depreciation/Fixed assets |
0.04 | 0.06 | 0.06 | 1.76 | 2.74 | 3.38 | 3.89 | 2.19 | 1.16 | 1.73 |
Cash ROIC |
(17.66%) | (16.33%) | (4.00%) | (8.25%) | (16.76%) | 8.81% | (8.20%) | (11.57%) | (15.69%) | (27.84%) |
Accounts Receivable Turnover |
3.07 | 131.67 | 7.89 | 23.26 | 20.55 | 0.00 | 0.00 | 35.32 | 0.00 | 0.00 |
Accounts Payable Turnover |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Inventory Turnover |
— | — | — | — | — | — | 0.00 | — | — | — |
Average Days of Payables |
0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Days of Inventory on Hand |
— | — | — | — | — | — | 0.00 | — | — | — |
Average Receivables |
0.34 | 0.21 | 0.12 | 0.04 | 0.04 | — | — | 2.59 | — | — |
Average Payables |
8.79 | 13.35 | 7.55 | 1.36 | 2.68 | 3.90 | 6.48 | 17.33 | 16.58 | 6.82 |
Average Assets |
422.61 | 478.15 | 497.56 | 459.03 | 376.12 | 471.17 | 683.70 | 727.21 | 621.75 | 436.96 |
Average Common Equity |
363.04 | 386.30 | 365.09 | 297.96 | 228.46 | 325.02 | 544.04 | 591.70 | 524.15 | 383.70 |
Columns are period end dates