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Carl Icahn fires back at Bill Gross on Twitter

Carl Icahn, chairman of Icahn Enterprises

Billionaire investor Carl Icahn took a shot back at Bill Gross after the co-chief investment offer at Pimco lambasted Icahn last week on Twitter for his activist investor role in Apple stock.

Icahn wrote, "To Bill Gross @PIMCO: If you really want to do good, why not join like Gates, I and many others have?"

Pimco did not immediately reply to CNBC's request to comment on Icahn's Tweet.

The Giving Pledge is a commitment by several of the world's wealthiest people, including Bill Gates and Warren Buffett, to dedicate the majority of their money to philanthropy.

(Read more: Pimco's Gross tells Icahn to leave Apple alone)

Icahn's latest barb comes days after Pimco's Gross Tweeted on Thursday, "Gross: Icahn should leave #Apple alone & spend more time like Bill Gates. If #Icahn's so smart, use it to help people not yourself."

Last Thursday in a public letter to Apple CEO Tim Cook, Icahn called on the tech giant to commence a $150 billion share buyback immediately.

—By CNBC's Katie Little. Follow her on Twitter @KatieLittle