NEW YORK ( TheStreet) -- Federal investigators raided three hedge-fund companies on Monday as part of a wider probe into insider trading allegations across the financial-services industry.

According to news reports, the Federal Bureau of Investigation executed search warrants at Stamford, Conn.-based Diamondback Capital Management, New York-based Level Global Investors and Boston-based Loch Capital Management.

The raids come on the heels of a report in the Wall Street Journal last week that outlined a wide-ranging investigation involving Goldman Sachs ( GS), UBS ( UBS), Deutsche Bank ( DB), a fund called Jennison Associates, which is part of Prudential Financial ( PRU) and the hedge funds Ziff Brothers, Jana Partners and TPG-Axon Capital Management.

Here is a look at the top common stock holdings of the three firms involved in Monday's FBI probe, as of Sept. 30, according to their most recent filings with the Securities and Exchange Commission:

1. Diamondback Capital Management

Total investments: $4.7 billion, heavily weighted in energy, utilities and financials.

Top stocks: El Paso ( EP), 12.6 million shares worth $156.3 million, 3.3% of portfolio; JPMorgan Chase ( JPM), 2.5 million shares worth $96.4 million, 2% of portfolio; Canadian Natural Resources ( CNQ), 2.6 million shares worth $91.4 million, 1.9% of portfolio; Plains Exploration & Production Co. ( PXP), 3.4 million shares worth $90.6 million, 1.9% of portfolio; PPL Corp. ( PPL), 3.3 million shares worth $90 million, 1.9% of portfolio; Citigroup ( C), 20.4 million shares worth $79.6 million, 1.7% of portfolio; Petrohawk Energy Corp. ( HK), 3.4 million shares worth 54.7 million, 1.2% of portfolio; State Street ( STT), 1.3 million shares worth $50.1 million, 1.2% of portfolio; Exxon Mobil ( XOM), 750,000 shares worth $46.3 million, worth 1% of portfolio; Quicksilver Resources ( KWK), 3.5 million shares worth $44 million, 0.9% of portfolio.

2. Level Global Investors

Total investments: $3.1 billion, heavily weighted in media and technology.

Top stocks: Virgin Media ( VMED), 19.3 million shares worth $445.6 million, 14.4% of portfolio; Apple ( AAPL), 538,303 shares worth $152.7 million, 4.9% of portfolio; Monsanto ( MON), 2.95 million shares worth $141.4 million, 4.6% of portfolio; Oracle Corp. ( ORCL), 4.45 million shares worth $119.5 million, 3.9% of portfolio; Sina Corp. ( SINA), 2.2 million shares worth $112.4 million, 3.6% of portfolio; Citigroup, 27 million shares worth $105.6 million, 3.4% of portfolio; McDonalds ( MCD), 1.4 million shares worth $104.3 million, 3.4% of portfolio; Fossil ( FOSL), 1.7 million shares worth $82.8 million, 3% of portfolio; Qualcomm Inc. ( QCOM), 2 million shares worth $90.3 million, 2.9% of portfolio; Baidu Inc. ( BIDU), 847,000 shares worth $86.9 million, 2.8% of portfolio.

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