As of February 2026 Prio SA (Petro Rio) has a market cap of ยฃ6.25 Billion. This makes Prio SA (Petro Rio) the world's 2297th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.