Prothena's financial profile is defined by extreme revenue lumpiness, with quarterly swings from $51.1M in 2026Q1 to $1.0M in 2026Q2, suggesting a model reliant on non-recurring licensing milestones rather than sustainable product sales.
Price trend, volume and key moving averages
Trailing total returns as of 11/8/2026, which may include dividends or other distributions. Benchmark is S&P 500 (^GSPC).
Check whether operating performance supports the current valuation.
Recent results and news deserve attention only when they alter the forward view.
| Quarter | EPS (Act vs Est) | Revenue (Act vs Est) |
|---|---|---|
Q4 2026Latest Nov 5, 2026 | -$0.32-40.9% vs -$0.23 | $620,000-93.5% vs $10M |
Q3 2026 Aug 6, 2026 | -$0.32+17.9% vs -$0.39 | $1M+139.5% vs $421,667 |
Q2 2026 May 7, 2026 | $0.60+293.5% vs -$0.31 | $51M+6215.2% vs $808,909 |
Q1 2026 Feb 19, 2026 | -$0.44+2.2% vs -$0.45 | $21,000-98.4% vs $1M |
Shares of Prothena Corporation plc (NASDAQ: PRTA - Get Free Report) have been assigned a consensus rating of "Moderate Buy" from the seven analysts that are covering the stock, Marketbeat.com reports. One equities research analyst has rated the stock with a sell rating, one has given a hold rating, four have issued a buy rating and
DUBLIN--(BUSINESS WIRE)---- $PRTA #Prothena--Prothena today reported financial results for the third quarter and first nine months of 2026 and provided business highlights.
Prothena Corporation plc (NASDAQ: PRTA - Get Free Report) major shareholder William Scully acquired 50,000 shares of the company's stock in a transaction on Friday, October 23rd. The shares were acquired at an average price of $8.07 per share, for a total transaction of $403,500.00. Following the completion of the acquisition, the insider directly owned 1,187,000
Prothena Corporation plc (NASDAQ: PRTA - Get Free Report) major shareholder William Scully purchased 100,000 shares of the business's stock in a transaction that occurred on Thursday, October 22nd. The stock was bought at an average cost of $8.19 per share, with a total value of $819,000.00. Following the acquisition, the insider owned 1,137,000 shares in
Benchmark PRTA against direct peers instead of judging its metrics in isolation.
Key metrics vs top competitors for Prothena Corporation plc (PRTA)
| Company | Price | Market Cap | P/E Ratio | Rev Growth (1Y) | Net Margin | ROE | Div Yield |
|---|---|---|---|---|---|---|---|
| $7.97 | $417.26M | -17.11 | -92.84% | -45.43% | -8.34% | — | |
| $15.43 | $1.52B | -3.01 | 20.13% | -71.78% | — | — | |
| $39.42 | $6.55B | -11.55 | 33.87% | -64.64% | -110.84% | — | |
| $155.94 | $20.82B | 7.90 | 65.19% | 54.34% | 159.72% | — | |
| $18.28 | $2.3B | -5.23 | -4.26% | -445% | -90.04% | — | |
| $248.35 | $36.69B | 105.48 | 1.39% | 3.38% | 1.86% | — |
Prothena Corporation plc (PRTA) vs competitors — business, growth, and fundamentals comparison against the closest industry rivals.
Verify the primary filings, follow material updates, and answer the remaining questions.
Prothena Corporation plc (PRTA) SEC filings — annual & quarterly reports (10-K, 10-Q)
Aug 6, 2026·SEC
May 15, 2026·SEC
May 7, 2026·SEC
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Prothena Corporation plc (PRTA) stock FAQ — growth, dividends, profitability & financials explained
Prothena Corporation plc (PRTA) reported $52.7M in revenue over the trailing twelve months. Revenue was $9.7M in fiscal year 2025. That is 679% more than the $1.2M of fiscal year 2010.
Prothena Corporation plc (PRTA) grew revenue by 347.4% over the trailing twelve months, compared with the twelve months before.
No. Prothena Corporation plc (PRTA) reported a net loss of $24.0M over the trailing twelve months.
Prothena Corporation plc (PRTA) had a return on equity (ROE) of -8.3% over the trailing twelve months. A negative ROE means the company lost money over the period.
Prothena Corporation plc (PRTA) had negative free cash flow of $32.2M over the trailing twelve months.
