As of August 2026 National Grid has a market cap of โฌ70.41 Billion. This makes National Grid the world's 318th 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.
On Aug 14th, 2026 the market cap of National Grid was reported to be: