Carl Icahn thinks the stock market's most valuable company is 'undervalued and misunderstood'

Apple reported another monster quarter on Monday, with earnings, revenue, and iPhone sales all topping expectations. 

The company also announced that it will return $200 billion to shareholders over the next 2 years. 

But activist hedge fund manager Carl Icahn still doesn't think investors get it. 

In a tweet on Tuesday morning, the 79-year-old said:

Apple's market cap is around $760 billion, about double that of the US stock market's next-largest company, Microsoft. 

According to his latest filings with the SEC, Icahn owns around 52 million shares of Apple, a stake that at today's market price of $132 is worth around $6.8 billion.