"The one thing I disagree with the company on is not buying a great deal more stock here," Icahn said in an interview on CNBC's "Fast Money: Halftime Report."
In the Monday letter, Icahn—who owns more than 52 million Apple shares—valued the company at $240 per share, nearly double its current price. Icahn's suggested value would make Apple worth nearly $1.5 trillion.
He called for accelerated stock buybacks, and reiterated Tuesday that he did not intend to recommend Apple to investors. The tech giant last month said it would increase its share repurchase authorization to $140 billion from $90 billion announced last year.