今天MBI狂涨18%，随同整个MORTGAGE INSURERS，受11月份（政府原定于11月底中止首次买房8000刀CREDIT,现在被延长，且扩展至其他买房人）二手房销售数据刺激。总的来看，在被剔除出SP500后，MBI被机构资金吸纳，后市似乎可以看好，当然不排除短期回调。在同板块中，今天MBI涨势并不很强。参见今天评论文章。Mortgage insurers surge on housing dataS&P downgrades five companies in the sectorExplore related topicsBanks Insurance MGIC Investment Corp Radian Group Story Quotes Comments Screener (4) Alert Email Print ShareBy Alistair Barr, MarketWatch SAN FRANCISCO (MarketWatch) -- Mortgage insurers surged Tuesday after a better-than-expected home sales report lifted hope that the sector won't suffer as heavy losses from defaults and foreclosures. Home resales rose 7.4% in November, according to the National Association of Realtors. That was more than double the 3.3% increase economists had expected. Read more on existing-home sales. Mortgage insurance helps home buyers who don't have enough money for a traditional down payment of 20% of the purchase price. As house prices have slumped and defaults surged, mortgage insurers have had to pay significantly more claims on these policies. Stronger demand for houses is good news because that could help limit losses the sector faces from delinquencies and foreclosures. MGIC Investment /quotes/comstock/13*!mtg/quotes/nls/mtg (MTG 6.29, -0.07, -1.10%) , one of the largest independent mortgage insurers, jumped 25% to close at $6.36 on Tuesday. Rivals Radian Group /quotes/comstock/13*!rdn/quotes/nls/rdn (RDN 8.08, -0.04, -0.49%) and PMI Group /quotes/comstock/13*!pmi/quotes/nls/pmi (PMI 2.46, +0.43, +21.18%) gained 26% and 21%, respectively. American International Group Inc. /quotes/comstock/13*!aig/quotes/nls/aig (AIG 30.49, -0.56, -1.80%) , which owns mortgage insurer United Guaranty, climbed 11% to close at $31.05 on Tuesday. Genworth Financial /quotes/comstock/13*!gnw/quotes/nls/gnw (GNW 11.96, -0.02, -0.17%) , which also runs a large mortgage insurance business, rose 3.1% to close at $11.98. Still, Standard & Poor's Ratings Services cut the ratings on five U.S. mortgage insurers Tuesday on concern about bigger-than-expected losses and expectations that unemployment will continue to rise through the second quarter of next year. Republic Mortgage Insurance Co., a unit of Old Republic /quotes/comstock/13*!ori/quotes/nls/ori (ORI 10.29, -0.08, -0.77%) , was cut three notches to BBB-, close to junk status, while Genworth Mortgage Insurance Corp. was cut two notches to BBB-. PMI and Radian units were lowered one notch further into junk at B+ while United Guaranty was cut one step to BBB. Alistair Barr is a reporter for MarketWatch in San Francisco