The companies whose shares are moving in pre-market trade on Monday are: Tyco International, Symantec, Cliffs Natural Resources, Apollo Group, Halliburton, Monsanto, Alcoa, Dr Pepper Snapple Group and PPL Corp.

Tyco International Ltd. (NYSE:TYC) shares climbed 7.95 percent to $50.90 in pre-market trading session on news that Schneider Electric SA is weighing a takeover offer for TYC, that would make the French company the world’s biggest maker of security systems.

Symantec Corp. (NASDAQ:SYMC) shares gained 2.14 percent to $18.60 in pre-market trading session. The company stock was upgraded to “outperform” rating from “perform” rating at RBC Capital.

Cliffs Natural Resources Inc. (NYSE:CLF) shares gained 2.01 percent to $100.68 in pre-market trading session. The company announced that it was to clinch a deal with China to export iron ores to the country.

Apollo Group Inc. (NASDAQ:APOL) shares gained 1.4 percent to $42.70 in pre-market trading session. Goldman Sachs initiated coverage on APOL with a “buy” rating and set a price target of $54.

Monsanto Co. (NYSE:MON) shares advanced 1.46 percent to $67.19 in pre-market trading session. The company reported that solid sales and disciplined spending have moved the group into a strong position for 2011 and beyond.

Halliburton Co. (NYSE:HAL) shares gained 1.27 percent to $48.74 in pre-market trading session. Jefferies & Co includes Halliburton to its favorite stocks list. Jefferies currently has a “buy” rating and price target of $59 on shares of Halliburton.

Alcoa Inc. (NYSE:AA) shares advanced 0.95 percent to $18.09 in pre-market trading session. The company is expected to report first quarter net income of $0.27 percent compared to $0.10 per share in the same quarter a year-ago.

Dr Pepper Snapple Group Inc. (NYSE:DPS) shares declined 1.41 percent to $36.93 in pre-market trading session. The company stock was downgraded to “sell” rating from “neutral” rating at Goldman Sachs.

PPL Corp. (NYSE:PPL) shares declined 1.35 percent to $25.52 in pre-market trading session. The company announced concurrent offerings of 80 million shares of its common stock and $750 million of equity units.