Prothena Corporation plc

As of June 30, 2026, Prothena Corp. Plc carries a market capitalization of 444.48M, placing it among publicly traded companies globally. Its enterprise value stands at 198.35M, reflecting the total theoretical takeover cost after accounting for cash holdings and debt obligations.

Prothena Corp. Plc's next confirmed earnings release is scheduled for October 29, 2026.

As of June 30, 2026, Prothena Corp. Plc has 51.74M shares outstanding.

These figures are as of June 30, 2026. The price-to-sales ratio is 9.61, and the price-to-book ratio stands at 1.77.

These figures are as of June 30, 2026. The EV/Sales ratio of 4.16 reflects the premium investors pay for the company's revenue stream, a useful check when earnings are depressed or negative. These enterprise value multiples are built on an enterprise value of 198.35M versus a market cap of 444.48M, with the gap driven by net debt and cash on the balance sheet.

As of June 30, 2026, Prothena Corp. Plc maintains a current ratio of 25.05, meaning it holds 25.1x the short-term assets needed to cover near-term liabilities.

Over the twelve months ended June 30, 2026, Prothena Corp. Plc posted a negative return on equity (ROE) of -14.39, meaning shareholder capital produced losses rather than profits. Return on assets (ROA) is negative at -12.54, reflecting losses generated across the asset base. The company generates approximately 524,506.69 in revenue per employee across its workforce of 91.00, a quick read on workforce productivity versus industry peers.

Over the twelve months ended June 30, 2026, Prothena Corp. Plc recorded an income tax benefit of -313,357.40 rather than an expense, typically from losses, carryforwards, or the release of a tax provision. The company reported a pretax loss of -38.82M and -38.51M in bottom-line net income, so the effective tax rate carries little signal until profitability returns.

As of the close on October 22, 2026, Prothena Corp. Plc's stock has declined approximately 13.58% over the past 52 weeks. The 50-day moving average sits at 7.71, while the 200-day moving average is 7.99.

Over the twelve months ended June 30, 2026, Prothena Corp. Plc generated 47.73M in revenue and converted that into -38.51M in net income, yielding earnings per share of -0.72. EBITDA reached -47.86M, while operating income came in at -52.40M.

As of June 30, 2026, Prothena Corp. Plc holds 252.26M in cash and equivalents against 6.12M in total debt, resulting in a net debt position of -252.26M. Total book value stands at 251.12M, with working capital of 245.39M providing operational flexibility.

Prothena Corp. Plc produced -52.56M in operating cash flow over the twelve months ended June 30, 2026. After subtracting -579,448.60 in capital expenditures, free cash flow totaled -53.14M - equivalent to -1.00 per share.

These figures cover the twelve months ended June 30, 2026. The operating margin of -109.79 and net profit margin of -80.67 provide insight into operational efficiency.

These figures cover the twelve months ended June 30, 2026. Free cash flow yield is negative at -11.57: the business is consuming cash rather than generating it, so any dividend is not covered by free cash flow. Total shareholder yield reaches 4.44, combining dividends paid with share buybacks and debt reduction for a fuller picture of capital returned to Prothena Corp. Plc shareholders.

As of June 30, 2026, Prothena Corp. Plc has an Altman Z-Score of 13.90, well above the 3.0 threshold that indicates strong financial health and minimal bankruptcy risk.