Apple stock reached a price of $600 a share for the first time on Thursday before edging back. The intraday record came one day ahead of new iPad launch. The stock is already up by $200 since the first trading day of the year. Apple's share price has been steadily rising since last week’s unveiling of the new iPad by CEO Tim Cook, and with early projections showing Apple set to sell 66 million iPads in 2012. The company’s market cap rose to $550 billion by Thursday. Thursday’s high opening—a record for Apple—could not be maintained, and share prices dropped in early trading.