(Adds close of U.S. markets)
By Herbert Lash
NEW YORK, Feb 25 (Reuters) - Global stocks jumped to big gains on Monday on easing credit worries as a proposed plan to rescue a leading U.S. bond insurer began to emerge and a credit agency's raised its view of another huge insurer.
Oil rose above $99 in volatile trading, and New York gold futures finished lower after setting a record high of $958.40 an ounce last week.
The dollar and euro both rose against the yen because the rescue plan for Ambac Financial Group Inc <ABK.N> began to take shape and Standard & Poor's gave a more upbeat new assessment of MBIA Inc <MBI.N>, whose improved creditworthiness affects billions of dollars of debt.
The Dow Jones industrial average <
> was up 181.95 points, or 1.47 percent, at 12,562.97 in early, unofficial closing prices. The Standard & Poor's 500 Index <.SPX> was up 17.89 points, or 1.32 percent, at 1,371.00. The Nasdaq Composite Index < > was up 23.88 points, or 1.04 percent, at 2,327.23."We're robustly higher across a broad spectrum. Keeping the AAA rating (on MBIA) was massively important for the market, coupled with the Ambac news," said Peter Kenny, managing director at Knight Equity Markets in Jersey City, New Jersey.
U.S. Treasury prices fell and European credit spreads tightened on signs of eased credit concerns. A bailout would help limit the damage from the credit crisis, which has shaken U.S. and European banks and threatened to slow economic growth.
"Bonds are getting hit," said Andrew Brenner, a market analyst at MF Global. "The Ambac deal will be key to how the market trades this week."
Investors have been spooked by the threat of credit downgrades raised by bond insurers' exposure to U.S. subprime mortgages. The U.S. financial service sector has been particularly hard hit by credit crisis.
Even with the bond insurer's crisis potentially solved, the global financial system would still need to work through losses in the hundreds of billions of billions of dollars for bad loans.
Goldman Sachs said it expects additional write-downs of about $1 billion to $12 billion each for several major U.S. brokers in the first quarter, with Citigroup <C.N> estimated to record the highest amount of about $12 billion.
The brokerage lowered its first-quarter and 2008 earnings estimates for Bear Stearns <BSC.N>, Lehman Brothers <LEH.N>, Morgan Stanley <MS.N>, JPMorgan Chase <JPM.N> and Merrill Lynch <MER.N> to reflect continued challenges in the credit markets.
The rescue plan for Ambac had been expected to be announced on Monday or Tuesday, sources said last week. Reports of a bailout led U.S. stocks to reverse course and post a late-day rally last Friday.
European shares rose, buoyed by financials amid consolidation talk, hopes that a Ambac rescue for U.S. bond was close and as Qatar's $60 billion sovereign wealth fund weighed investing in Europe's banking sector.
The pan-European FTSEurofirst 300 index <
> unofficially closed 1.7 percent higher at 1,342.65 points, the highest close since Feb. 4.Lending support to European banking shares, Qatari Prime Minister Sheikh Hamad bin Jassim al-Thani said that Quatar, which has bought "under" 2 percent of Credit Suisse <CSGN.VX>, is looking to spend between $10 billion and $15 billion over the next two years on bank stakes to diversify the country's energy-based economy.
The Nikkei average <
> rose more than 3 percent to a six-week closing high on a newspaper report that said China's sovereign wealth fund would buy as much as $10 billion in Japanese stocks and optimism about the Ambac rescue plan.But Hong Kong blue chips and China plays fell as tumbling mainland stock markets unnerved investors, prompting a sell-off of Chinese large caps in the financial and commodity sectors.
MSCI main world equity index <.MIWD00000PUS> was up 0.7 percent.
The benchmark 10-year U.S. Treasury note <US10YT=RR> was down 26/32, with the yield at 3.9042 percent. The 2-year U.S. Treasury note <US2YT=RR> was down 7/32, with the yield at 2.1329 percent. The 30-year U.S. Treasury bond <US30YT=RR> was down 40/32, with the yield at 4.6629 percent.
Against the Japanese yen, the dollar <JPY=> was up 0.76 percent at 108.04 from a previous session close of 107.23.
U.S. crude oil futures bounced higher in volatile as traders eyed geopolitical turmoil and OPEC's upcoming policy meeting and weighed rising inventories and the risk of economic slowdown.
New York gold futures finished lower after an U.S. official said that Congress could support gold sales by the International Monetary Fund (IMF), stirring fears that such sales will take a toll on sentiment and weigh heavily on bullion. The gold contract for April delivery at the COMEX division of the New York Mercantile Exchange <GCJ8> settled down $7.30 to $940.50 an ounce, trading between $935.50 and $954.90. (Reporting by Herbert Lash. Editing by Richard Satran)