Google temporarily outperforms Exxon to become 2nd most valuable US company

Google for a short time surpassed Exxon Mobile to become the second-largest United States company by market value.

The fast-growing tech giant briefly nudged past Big Oil's biggest player to become the second-largest US company. Google shares have surged more than 50% in 2013, as the company's online ad growth helped the company earn profits.

According to Fox News, in regular trading, Google shares rose above Exxon's before settling back into the No. 3 slot with a market capitalization of $394.3 billion.

For the past 18 months, Google, Exxon and No. 4, Microsoft, have all lagged behind Apple, whose market value Friday stood at $463.6 billion. Google, meanwhile, has seen its shares rise 3.5% since the year began.