The 4 most valuable public companies are all tech companies

Amazon passed Exxon Mobile in market cap on Monday, making it the fourth most valuable public company.

The switch came after Amazon posted its fifth straight quarter of profits last week as the oil giant's profits tumbled 59 percent during the same rough period.

Now, tech companies are in spots 1-4 at top of the market value rankings. Facebook comes in at no. 6, and if Exxon keeps dropping - it's down over 2% in early trading - all five could be tech companies by the end of the day.

Here are the market cap rankings as of this writing, according to Yahoo Finance:

1. Apple ($appl): $566 billion
2. Alphabet ($goog): $562B
3. Microsoft ($msft): $433B
4. Amazon ($amzn): $365B
5. Exxon Mobile ($xom): $356B
6. Facebook ($fb): $353B

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