Prothena Corp. Public Ltd. Co. (PRTA) intrinsic value & 10-year financials
Prothena Corp. Public Ltd. Co. (PRTA) has a Graham intrinsic value of $45.84 per share. At $8.35 on Oct 17, 2026, the stock trades 82% below that value. Over the last 10 fiscal years revenue grew 27.9% a year to $9.7M, with an average return on invested capital of -2193.0%.
- Graham intrinsic value
- $45.84
- Share price (Oct 17, 2026)
- $8.35
- Price vs Graham value
- 82% below
- Market cap
- $449.5M
- Revenue (FY2025)
- $9.7M
- Revenue growth (10-yr CAGR)
- 27.9%
- ROIC (10-yr avg)
- -2193.0%
- Free cash flow (FY2025)
- —
PRTA 10-year financial history
| Fiscal year | Revenue | Net income | EPS (diluted) | Free cash flow | Operating margin | ROIC |
|---|---|---|---|---|---|---|
| FY2025 | $9.7M | -$244.1M | -$4.53 | — | -2216.4% | -19503.9% |
| FY2024 | $135.2M | -$122.3M | -$2.27 | — | -114.4% | 1276.5% |
| FY2023 | $91.4M | -$147.0M | -$2.76 | — | -209.1% | 259.1% |
| FY2022 | $53.9M | -$116.9M | -$2.47 | — | -244.1% | 125.6% |
| FY2021 | $200.6M | $67.0M | $1.38 | — | 35.9% | -65.2% |
| FY2020 | $853.0K | -$111.1M | -$2.78 | — | -13216.2% | 122.2% |
| FY2019 | $814.0K | -$77.7M | -$1.95 | — | -10527.9% | 90.4% |
| FY2018 | $955.0K | -$155.6M | — | — | -16634.0% | 151.3% |
| FY2017 | $27.5M | -$153.2M | — | — | -564.2% | — |
| FY2016 | $1.1M | -$160.1M | — | — | -15121.8% | — |
Source: annual 10-K filings on SEC EDGAR. Figures in USD.
Executive summary
PROTHENA CORP PUBLIC LTD CO is a consistent compounder, expanding top-line revenue at 27.9% annually over the past decade.
PROTHENA CORP PUBLIC LTD CO returns on capital have been average, hovering around 11.9% ROIC over the decade.
PROTHENA CORP PUBLIC LTD CO capital allocation metrics are N/A for the decade; share count and net debt history are incomplete.
Benjamin Graham lens
Under Benjamin Graham's formula using SEC EDGAR fundamentals, PROTHENA CORP PUBLIC LTD CO is modeled at 15.0% normalized earnings growth with a 5.1% bond-yield adjustment. The resulting Graham intrinsic value estimate is $45.84 per share.