Alphabet's soaring stock just pushed it above a $1 trillion market cap. Here are the 11 highest-valued public companies.

Market cap: $350 billion

Year-to-date performance: up 8.7%

Market cap: $433 billion

Year-to-date performance: down 0.5%

Market cap: $491 billion

Year-to-date performance: up 12.4%

Market cap: $561 billion

Year-to-date performance: up 1.7%

Market cap: $608 billion

Year-to-date performance: up 6.2%

Market cap: $639 billion

Year-to-date performance: up 8.1%

Market cap: $921 billion

Year-to-date performance: up 0.6%

Market cap: $1 trillion

Year-to-date performance: up 10.2%

Market cap: $1.27 trillion

Year-to-date performance: up 5.5%

Market cap: $1.39 trillion

Year-to-date performance: up 8.7%

Market cap: $1.84 trillion

Year-to-date performance: down 1.6%