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Icahn owned 3.9 million shares of Apple as of Sept. 30 - filing

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Activist investor Carl Icahn disclosed Thursday that he owned about 3.88 million shares of technology giant Apple at the end of September, a regulatory filing showed.

Icahn revealed on social media platform Twitter on August 13 that his investment firm had a "large position" in Apple, but did not specify the size of the stake at the time.

(Read more: Icahn: I had a 'good conversation' with Tim Cook)

Icahn, who has demanded a $150 billion buyback publicly and privately to Apple chief executive Tim Cook since August, has said that Apple shares could trade at $700 with a larger stock buyback.

Apple shares were up 1.44 percent to trade at $528.16 at the close of trading on Thursday. That price is up about 10.8 percent from Sept. 30, when the stock closed at $476.75.

Based on that closing price and the stake revealed in the filing with the Securities and Exchange Commission, Icahn's stake in the company at the end of the third quarter was worth about $1.85 billion.

(Read more: Icahn asks Apple to commence immediate buyback offer)

In a letter to Cook made public on Oct. 24, Icahn revealed that he had increased his stake in Apple to just over 4.7 million shares since dining privately with Cook in September- underscoring his belief that the stock was undervalued.

Icahn was not immediately available for comment.

Shares in Icahn's investment firm Icahn Enterprises L.P. have risen more than 158 percent this year and were up 2.4 percent to trade at $115.38 at the close of trading Thursday.

(Read more:Icahn's dinner with Tim Cook)

Icahn's investment fund rose 26.3 percent from the start of the year through Sept. 30, owing to investments in companies like Netflix and Herbalife, according to his firm's 10Q regulatory filing earlier this month.

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