美国运通面临增长挑战，辛克罗尼和资本一号成为潜在选择：美国银行分析师BofASecuritiesanalystKennethBrucedowngradedAmericanExpressCo(NYSE:AXP)fromBuytoNeutralwithapricetargetof$263.Thestockpriceslidafterthererating.Giventhepotentialforsubduedbillingsvolumegrowthandcurrentpremiumvaluation,Bruceseeslimitedincrementalupsideforthestock.Also…