The milestone was reached in early trading on Jan. 12 as GOOGL stock rose $1.93 to trade at $333.50 per share. That gave Alphabet an official market capitalization of just over $4 trillion.
However, trading in GOOGL stock was choppy along with the rest of the market, with all the major U.S. indices in the red to start the week.
The stock of Alphabet has a consensus Strong Buy rating among 33 Wall Street analysts. That rating is based on 27 Buy and six Hold recommendations issued in the last three months.
The average GOOGL price target of $337.87 implies 2.57% upside from current levels.