FACTBOX: Spreads of U.S. mergers and acquisitions

(Reuters) - The following list shows the arbitrage spread for proposed mergers and acquisitions of U.S. companies.

Historically, the wider the spread, the more investors doubt a deal will close. Arbitrage spreads measure the difference between the offered takeover price and the target company's current trading price.

For real-time spreads, go to ACQUIRER TARGET DEAL VALUE* PRICE/SHARE SHARE% Mars Inc Wm Wrigley 21,917.51 80 3.83 Consortium Clear Channel 17,900.00 36 2.77 HP Electronic Data 12,565.03 25 2.25 CME Group Inc NYMEX 11,071.73 88.96 5.89 NRG Energy Inc Calpine Corp 10,916.43 22.31 -3 Ingersoll-Rand Trane Inc 9,208.23 46.51 0.34 Nokia Oyj NAVTEQ Corp 7,657.19 78 1.44 Hexion Huntsman Corp 6,213.24 28 32.08 Liberty Mutual Safeco Corp 6,124.91 68.25 1.77 Consortium Penn National Gamin 5,732.69 67 46.42 Triarc Companies Inc Wendy's 4,758.27 28.26 1.55 Sirius XM 4,570.57 11.82 5.93 Iberdrola SA Energy East Corp 4,202.70 32.56 28.49 Bank of America Countrywide 4,143.76 6.07 10.35 Reed Elsevier ChoicePoint Inc 3,576.80 50 2.82 Consortium Puget Energy Inc 3,510.75 30 8.07 Finmeccanica SpA DRS Tech 3,359.00 81 3.21 Delta Air Northwest Air 3,051.85 7.63 7.85 WebMD HLTH Corp 2,897.69 13.08 8.94 Smith Intl W-H Energy 2,894.29 92.98 -0.25 United Tech Diebold Inc 2,631.77 40 1.39 Mapfre SA Commerce Group 2,316.14 36.7 0.05 Nationwide Mutual InsNationwide Financial 2,204.24 47.2 -7.18 Consortium Post Properties 2,054.24 47 33.6 Hellman & Friedman Getty Images Inc 2,024.80 34 1.71 Electronic Arts Inc Take-Two Interactive 1,932.61 26 -4.06 CBS CNET 1,751.96 11.5 0.26 Great Plains Aquila Inc 1,701.41 4.01 6.33 Stone Energy Bois d Arc 1,650.94 24.86 2.09 Grey Wolf Inc Basic Energy 1,418.18 35.31 24.39 Blockbuster Circuit City 1,346.93 8 67.01 Dubai Intl Och-Ziff Capital 1,258.62 33 63.85 Management Group CKX Inc 1,164.71 12 14.72 Fifth Third Bancorp First Charter Corp 1,089.69 31 1.41 TZ Holdings LP TriZetto Group Inc 948.21 22 2.61 Ansys Inc Ansoft Corp 760.86 36.69 0.69 Verizon Rural Cellular 679.16 45 0.58 Severstal' OAO Esmark Inc 671.61 17 -9.77 Sumitomo Axcelis Tech 613.5 6 6.19 Tullett Prebon eSpeed Inc 605.14 12 34.08 Golden Gate Children's Place 577.96 24 -27.03 O'Reilly Auto CSK Auto Corp 528.37 12 4.71 NOTE: * Deal values in millions of U.S. dollars SOURCE: Reuters (Compiling by Oswald Blackwood; Editing by Brian Moss) (For more M&A news and our DealZone blog, go to here)