Whale Watch: What Big Funds Are Buying and Selling

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Hedge funds and other big investors are reporting their quarterly holdings to the Securities and Exchange Commission, offering a glimpse into what some of the big fish have been buying and selling.

Pershing Square, the activist hedge fund run by Bill Ackman, raised its holdings in Procter & Gamble shares as of September 30, according to its latest quarter 13F filing.

Form 13F is a quarterly report of equity holdings filed by institutional investment funds with at least $100 million in assets.

The fund also took a 21.4 million share stake in Burger King Holdings during the quarter.

(Read More: Buffett's Berkshire Sells Most of J&J and GE Stakes.)

David Einhorn's Greenlight Capital eld a 5.1 million share stake in Yahoo! as of September 30, according to its latest 13F filing.

Greenlight also increased its holdings of General Motors o 21.6 million shares.

The fund pared back its holdings in tech names Apple and Microsoft and telecom Sprint Nextel, while closing out of its positions in Best Buy and Expedia . (Read More: For Hedge Funds, a Half Percent Is the New Move.)

Third Point, the hedge fund founded by Daniel Loeb, shook up its holdings of managed care companies in the third quarter. The fund dissolved its stakes in Humana and Aetna, but increased its positions in UnitedHealth and WellPoint .

Third Point also took a 5 million share stake in Kraft Foods and a 6 million share stake in Symantec as of the end of the third quarter.

According to its quarterly filing, Appaloosa Management, which was founded by David Tepper and Jack Walton, was investing in financials in the third quarter. The fund took stakes in AIG, JPMorgan and Morgan Stanley . It also upped its stakes in Citigroup and Hartford Financial but cut its stake in Bank of America .

Soros Fund Management lso disclosed a 15.2 million share stake in AIG as of the end of the third quarter, while Jana Partners took a 1.5 million share stake in the insurer.

As of September 30, Tiger Global Management as increased its stake in Facebook to 11.75 million Class A shares, from 1.95 million, according to its latest 13F filing.The hedge fund, co-managed by Charles Coleman and Feroz Dewan, also disclosed a new 7.2 million share stake in Burger King, a 2.3 million share stake in Moody's and a 1.3 million share stake in Groupon. Tiger also upped its stakes in Amazon.com and Baidu.

According to the filing, Tiger Global sold its entire holdings of Supervalu, Ubiquiti Networks and Homeaway and trimmed its Visa nd Google stakes in the quarter.

Facebook was also a new holding for Viking Global Investors, with the hedge fund taking a stake of 4.15 million shares as of the end of September. The fund also took a stake of 15.4 million shares in Williams Cos., valued at $538 million as of the end of the third quarter. (Read More: Facebook Stock Jumps as Lock-Up Expire.)

Meanwhile, Farallon Capital eported that it has sold its entire 1.69 million share stake in big-box retailer Target. The stake was worth about $98 million.

— Reuters contributed to this report.