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PROTHENA CORP PUBLIC LTD CO

PRTA Clue Score40
Ireland Fiscal year ends December CIK 0001559053
$8.84 +2.67% Close, 9 Oct 2026
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Price $8.84 −87.26% Close, 9 Oct 2026

Closing prices at the end of each trading day, from 12 Oct 2016. Not a live quote. Adjusted for share splits, so the line has no step at a split; dividends are not added back. P/E and P/FCF are the market value over the last full fiscal year's net income or free cash flow, as public on each day, so they step once a year when the annual report comes out. A hatched band marks a stretch with none: a year of net loss, or of cash burnt.

Revenue and profit

What the business sells, and what is left of it. Point at a year for the detail.
RevenueOperating incomeNet income
Fiscal year 2016Revenue1.1Operating income−159.5Net income−160.1Fiscal year 2017Revenue27.5 +2,508.4%Operating income−155.3Net income−153.2Fiscal year 2018Revenue1.0 −96.5%Operating income−158.9Net income−155.6Fiscal year 2019Revenue0.8 −14.8%Operating income−85.7Net income−77.7EPS, diluted−1.95Fiscal year 2020Revenue0.9 +4.8%Operating income−112.7Net income−111.1EPS, diluted−2.78Fiscal year 2021Revenue200.6 +23,414.3%Operating income72.0Net income67.0EPS, diluted1.38Fiscal year 2022Revenue53.9 −73.1%Operating income−131.6Net income−116.9 −274.6%EPS, diluted−2.47 −279.0%Fiscal year 2023Revenue91.4 +69.5%Operating income−191.0Net income−147.0EPS, diluted−2.76Fiscal year 2024Revenue135.2 +47.9%Operating income−154.6Net income−122.3EPS, diluted−2.27Fiscal year 2025Revenue9.7 −92.8%Operating income−214.6Net income−244.1EPS, diluted−4.53
FY2016FY2017FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Revenue 1.1 27.5 1.0 0.8 0.9 200.6 53.9 91.4 135.2 9.7
Growth +2,508.4% −96.5% −14.8% +4.8% +23,414.3% −73.1% +69.5% +47.9% −92.8%
Operating income −159.5 −155.3 −158.9 −85.7 −112.7 72.0 −131.6 −191.0 −154.6 −214.6
Net income −160.1 −153.2 −155.6 −77.7 −111.1 67.0 −116.9 −147.0 −122.3 −244.1
Growth −274.6%
EPS, diluted n/a n/a n/a −1.95 −2.78 1.38 −2.47 −2.76 −2.27 −4.53
Growth −279.0%

Margins

How much of each dollar of revenue it keeps. Point at a year for the detail.
Operating marginNet margin
Fiscal year 2016Operating margin−15,121.8%Net margin−15,176.1%Fiscal year 2017Operating margin−564.2%Net margin−556.8%Fiscal year 2018Operating margin−16,634.0%Net margin−16,297.9%Fiscal year 2019Operating margin−10,527.9%Net margin−9,542.6%Fiscal year 2020Operating margin−13,216.2%Net margin−13,029.8%Fiscal year 2021Operating margin35.9%Net margin33.4%Fiscal year 2022Operating margin−244.1%Net margin−217.0%Fiscal year 2023Operating margin−209.1%Net margin−160.9%Fiscal year 2024Operating margin−114.4%Net margin−90.5%Fiscal year 2025Operating margin−2,216.4%Net margin−2,520.6%
FY2016FY2017FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Operating margin −15,121.8% −564.2% −16,634.0% −10,527.9% −13,216.2% 35.9% −244.1% −209.1% −114.4% −2,216.4%
Net margin −15,176.1% −556.8% −16,297.9% −9,542.6% −13,029.8% 33.4% −217.0% −160.9% −90.5% −2,520.6%

Cash flow

The cash the business makes, what it reinvests, and what it hands back. Point at a year for the detail.
Operating cash flow
Fiscal year 2016Operating cash flow−116.3Fiscal year 2017Operating cash flow−131.2Fiscal year 2018Operating cash flow−28.3Fiscal year 2019Operating cash flow−53.0Fiscal year 2020Operating cash flow−80.4Fiscal year 2021Operating cash flow92.6Fiscal year 2022Operating cash flow−108.8Fiscal year 2023Operating cash flow−133.9Fiscal year 2024Operating cash flow−150.1Fiscal year 2025Operating cash flow−163.6
FY2016FY2017FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Operating cash flow −116.3 −131.2 −28.3 −53.0 −80.4 92.6 −108.8 −133.9 −150.1 −163.6

Balance sheet

What it holds against what it owes, at each year end. Point at a year for the detail.
Cash
Fiscal year 2016Cash386.9Shareholders’ equity365.4Fiscal year 2017Cash417.6Shareholders’ equity407.2Fiscal year 2018Cash427.7Shareholders’ equity323.0Fiscal year 2019Cash375.7Shareholders’ equity272.9Fiscal year 2020Cash295.4Shareholders’ equity184.0Fiscal year 2021Cash579.1Shareholders’ equity466.0Fiscal year 2022Cash710.4Shareholders’ equity622.0Fiscal year 2023Cash618.8Shareholders’ equity561.4Fiscal year 2024Cash471.4Shareholders’ equity486.9Fiscal year 2025Cash307.5Shareholders’ equity280.5
FY2016FY2017FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Cash 386.9 417.6 427.7 375.7 295.4 579.1 710.4 618.8 471.4 307.5
Shareholders’ equity 365.4 407.2 323.0 272.9 184.0 466.0 622.0 561.4 486.9 280.5

In millions of USD, except per-share figures and ratios. Fiscal years, as last filed with the SEC.

Financial statements FY2025 · 10-K

Balance sheet

In millions of USD, except per-share figures; shares in millions. Fiscal years ending December, each column as last filed with the SEC.
Click a line to chart it
Fiscal year FY2016 31 Dec 2016 FY2017 31 Dec 2017 FY2018 31 Dec 2018 FY2019 31 Dec 2019 FY2020 31 Dec 2020 FY2021 31 Dec 2021 FY2022 31 Dec 2022 FY2023 31 Dec 2023 FY2024 31 Dec 2024 FY2025 31 Dec 2025
Assets
386.9 417.6 427.7 375.7 295.4 579.1 710.4 618.8 471.4 307.5
0.2 0.2 0.0 0.1 0.0 0.0 0.0 5.2 0.0 n/a
56.5 55.0 52.8 3.9 2.6 2.0 1.7 3.8 3.1 2.1
460.0 496.3 498.8 419.3 333.0 609.4 758.0 696.4 547.1 326.8
Growth +7.9% +0.5% −15.9% −20.6% +83.0% +24.4% −8.1% −21.4% −40.3%
Liabilities
94.6 89.1 175.8 146.3 149.0 143.3 136.0 135.0 60.2 46.3
Equity
−289.2 −442.4 −598.0 −671.9 −783.0 −716.1 −833.0 −980.0 −1,102.3 −1,346.4
365.4 407.2 323.0 272.9 184.0 466.0 622.0 561.4 486.9 280.5
Growth +11.4% −20.7% −15.5% −32.6% +153.3% +33.5% −9.8% −13.3% −42.4%
Per share and net cash
34.8 38.5 39.9 39.9 39.9 46.7 52.1 53.7 53.8 53.8
calc 10.51 10.58 8.10 6.84 4.61 9.99 11.94 10.46 9.05 5.21

Lines marked calc are worked out here from filed figures; point at one for how.