Deals of the Week

1. Duke Energy (DUK) is buying Progress Energy (PGN) in a $13.7 billion deal that will create the largest utility in the U.S. The pace of power industry mergers has picked up as companies seek to add customers to counter falling prices.

2. DuPont (DD) offered $5.8 billion for Danisco, besting rival offers for the Danish maker of enzymes used in the manufacture of food and biofuels.

3. State-run China National BlueStar is buying the silicon businesses of Norway's Orkla for $2 billion. The People's Republic aims to become the world leader in solar and other low-carbon technologies.

4. Nielsen Holdings, the company that pioneered TV audience ratings, is seeking to raise $1.6 billion from an initial public offering scheduled for Jan. 25.

5. Malaysia's largest lender, Malayan Banking, bid $1.4 billion for Singaporean brokerage Kim Eng Holdings to enlarge its footprint in the region.

6. IGate (IGTE), based in Fremont, Calif., offered $1.2 billion—more than its own market value—for control of India's Patni Computer Systems (PTI), in a bid to boost sales in the world's largest technology outsourcing market.

7. Groupon completed a $950 million round of financing that values the daily coupon website at about $4.75 billion.

8. Vienna-based OMV is buying Pioneer Natural Resources' (PXD) oil exploration and production rights in Tunisia for $866 million.

9. Canada's HudBay Minerals (HBM) paid $524 million for control of Norsemont Mining. Norsemont is developing a large deposit of copper in Peru. The metal's price recently hit a record high.

10. An Andy Warhol print of Mao Zedong that the late actor Dennis Hopper shot up during some late-night carousing in the 1970s fetched $302,500—10 times the presale estimate—at a Christie's auction.

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