Revenue
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
Prothena Corp Public Ltd Co (PRTA)
Price$9.82Cached quote
Net income
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
Free cash flow
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
Total cash / debt
CashTotal debt
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
Financial statements
| 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | $9.7M | $135.2M | $91.4M | $53.9M | $200.6M | $853,000 | $814,000 | $955,000 | $27.5M | $1.1M | $1.6M | $50.9M | $676,000 | $2.7M | — |
| Research & development | $134.9M | $222.5M | $220.6M | $135.6M | $82.3M | $74.9M | $50.8M | $101.2M | $134.5M | $119.5M | $58.4M | $38.5M | $26.1M | $34.1M | $24.2M |
| Operating expenses | $224.3M | $289.7M | $282.4M | $185.5M | $128.6M | $113.6M | $86.5M | $159.8M | $182.8M | $160.6M | $81.5M | $57.5M | $41.1M | $44.1M | $29.8M |
| Operating income | −$214.6M | −$154.6M | −$191.0M | −$131.6M | $72.0M | −$112.7M | −$85.7M | −$158.9M | −$155.3M | −$159.5M | −$79.9M | −$6.6M | −$40.4M | −$41.4M | −$29.2M |
| Operating margin | −2,216.44% | −114.36% | −209.08% | −244.05% | 35.88% | −13,216.18% | −10,527.89% | −16,634.03% | −564.17% | −15,121.80% | −4,974.30% | −13.07% | −5,980.33% | −1,557.94% | — |
| EBITDA | −$213.7M | −$153.7M | −$190.1M | −$130.8M | $73.1M | −$111.2M | −$84.1M | −$155.6M | −$152.2M | −$157.1M | −$79.1M | −$5.9M | −$39.8M | −$40.9M | −$28.9M |
| EBITDA margin | −2,207.20% | −113.70% | −208.06% | −242.67% | 36.44% | −13,038.69% | −10,335.75% | −16,297.28% | −553.03% | −14,891.75% | −4,924.14% | −11.61% | −5,882.69% | −1,540.33% | — |
| Net income | −$244.1M | −$122.3M | −$147.0M | −$116.9M | $67.0M | −$111.1M | −$77.7M | −$155.6M | −$153.2M | −$160.1M | −$80.6M | −$7.2M | −$41.0M | −$41.4M | −$29.7M |
| Net profit margin | −2,520.57% | −90.49% | −160.91% | −216.95% | 33.39% | −13,029.78% | −9,542.63% | −16,297.91% | −556.84% | −15,176.11% | −5,016.30% | −14.06% | −6,064.50% | −1,557.98% | — |
| Basic EPSper basic share | -$4.53 | -$2.27 | -$2.76 | -$2.47 | $1.51 | -$2.78 | -$1.95 | -$3.93 | -$4.07 | -$4.66 | -$2.66 | -$0.29 | -$2.20 | -$2.84 | -$2.05 |
| Diluted EPSper diluted share | -$4.53 | -$2.27 | -$2.76 | -$2.47 | $1.38 | -$2.78 | -$1.95 | -$3.93 | -$4.07 | -$4.66 | -$2.66 | -$0.29 | -$2.20 | -$2.84 | -$2.05 |
Owners
Reported shareholders
Reported holdings Number of shares
View holders
| Holder | Shares held |
|---|---|
EcoR1 Capital, LLC | 5.3M |
SCULLY WILLIAM P | 888K |
Kinney Gene G. | 152.79K |
Smith Brandon S. | 130K |
Nguyen Tran | 97.21K |
Zago Wagner M. | 85K |
Swanson Chad J. | 85K |
Malecek Michael J | 80K |
Kingston Anne Evans | 66.94K |
Isaacs Michael John | 48.83K |
Walker Karin L | 25K |
Bars compare reported share counts. A matching total for this share class and reporting period is unavailable, so percentages are not shown.
Source: SEC Form 4 ↗Updated Sep 29, 2026 · Quarterly data
Insider buys & sells
| Transaction | Insider | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| Jun 16, 2026Form 4 | SCULLY WILLIAM PTenPercentOwner | BuyOrdinary Shares, par value $0.01 per share | 20.0K | $7.90 | $158.0K | 756.0K |
| Jun 11, 2026Form 4 | SCULLY WILLIAM PTenPercentOwner | BuyOrdinary Shares, par value $0.01 per share | 125.0K | $8.17 | $1.02M | 1.06M |
| Jun 4, 2026Form 4 | SCULLY WILLIAM PTenPercentOwner | BuyOrdinary Shares, par value $0.01 per share | 50.0K | $9.31 | $465.5K | 936.0K |
| Jun 2, 2026Form 4 | SCULLY WILLIAM PTenPercentOwner | BuyOrdinary Shares, par value $0.01 per share | 50.0K | $9.43 | $471.5K | 886.0K |
| May 22, 2026Form 4 | SCULLY WILLIAM PTenPercentOwner | BuyOrdinary Shares, par value $0.01 per share | 100.0K | $9.81 | $981.0K | 836.0K |