Apple and Amazon pass $1 trillion – which company is next?

• The $1 trillion valuation mark is now behind Apple and Amazon.
• Wall Street is looking to see which company crosses that milestone next.
• Alphabet and Microsoft are quickly closing in but each is still more than $100 billion away.

Microsoft's CEO Satya Nadella speaks to participants during the Viva Technologie show at Parc des Expositions Porte de Versailles on May 24, 2018, in Paris.

Chesnot | Getty Images

With the $1 trillion valuation mark now behind Amazon and , two more technology companies are quickly closing in on the milestone.

and are the next biggest companies racing to a $1 trillion market capitalization, each closing in on the mark yet still over $100 billion away. Here's what it would take to get the 10 U.S. companies behind Apple and Amazon to $1 trillion:

Wall Street expected Amazon shares to rise about 15 percent over the next year (as of Aug. 3, the day after Apple hit $1 trillion) — but it rose more than 10 percent in the past month, soaring past the milestone. Microsoft is a bit behind and will not likely surpass $1 trillion over the next 12 months, according to analysts. And while Wall Street expects Facebook to grow the most over the next year, it still has a very long way to go to reach the four comma club.

Apple is expected to cool off, with Wall Street projecting a small amount of growth for the company.