Today, Apple and Google are as inflammable as oil futures, showing daily volatility of 2 to 4 percent.

FORBES: Google And Apple: Why I Own Them Both

Apple is like the Nasdaq, is like yen, is like oil, is like orange juice, is like the euro.

FORBES: Will Another May Day Crisis Hit The Markets?

Oil company Exxon Mobil has regained the top slot after Apple shares fell 2.4%, following a 12% drop on Thursday.

BBC: Apple eclipsed by Exxon Mobil as most valuable company