The 5 most valuable US tech companies are now worth more than $5 trillion after Alphabet's record close

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5. Facebook

5. Facebook

Market cap: $632 billion

Year-to-date performance: up 8.5%

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4. Amazon

4. Amazon

Market cap: $931 billion

Year-to-date performance: up 1.7%

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3. Alphabet

3. Alphabet

Market cap: $1 trillion

Year-to-date performance: up 8.6%

2. Microsoft

2. Microsoft

Market cap: $1.27 trillion

Year-to-date performance: up 5.4%

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