Shares of Alphabet (GOOG, GOOGL) surged after the company reported fourth quarter results Monday, with after-hours stock prices signaling it has overtaken Apple (AAPL) as the world’s most valuable publicly traded company.

WHAT’S NEW: Alphabet reported Q4 EPS of $8.67, above analyst expectations of $8.10, and Q4 revenue of $21.33B, above consensus estimates of $20.77B.

WHAT’S NOTABLE: Alphabet reported that Google’s aggregate paid clicks were up 31% in Q4, while paid clicks on Google Network Members’ websites were up 2%, aggregate cost-per-click was down 13%, cost-per-click on Google websites was down 16%, and cost-per-click on Google Network Members’ websites was down 8%.

PRICE ACTION: Alphabet’s Class A shares under ticker symbol GOOGL are up 4.65% to $806.61 while its ordinary shares under symbol GOOG are up 5.25% to $791.50 in after-hours trading. Shares of Apple, meanwhile, are down fractionally to $96.18. According to CNBC, those after-hours levels, though not yet indicating real world value, represent a market capitalization of roughly $570B for Alphabet, surpassing Apple’s market cap of $535B.