Facebook’s stock-market valuation tops $230 billion By: MarketWatch March 20, 2015 at 15:26 PM EDT Facebook Inc.’s market capitalization grew by $16.1 billion this week to $231.6 billion, making it the 10th most valuable company in the S&P 500. Read More >> Related Stocks: Facebook General Electric JPMorgan Chase & Co Standard & Poors 500