Apple’s stock hit a new high on Monday, as it became the most valuable public company in history.

Apple’s market value — the price of its stock multiplied by the number of outstanding shares — hit US$623 billion in intraday trading, notes “CNN.” That eclipsed the previous record of $618.9 billion set by Microsoft on Dec. 30, 1999, at the height of the dot-com bubble, according to Howard Silverblatt, S&P’s senior index analyst.

Apple shares hit a new record of $664.74 per share. Read more at .