Shares of Cano Health Inc. CANO, +14.83% , which provides primary care to seniors, soared 17.6% in trading on Monday, while shares of Oak Street Health Inc. OSH, +4.59% , another medical provider for people covered by Medicare, jumped 3.5%. Amazon Inc. AMZN, -3.26% , CVS Health Corp. CVS, -1.51% , and UnitedHealth Group UNH, -0.31% are reportedly in a bidding war to buy Signify Health Inc. SGFY, +36.84% , a home-health provider, according to a report in The Wall Street Journal.