Ten companies traded on U.S. exchanges have a trillion-dollar valuation, and Wall Street says Meta Platforms is the best one to buy right now.Ten companies traded on U.S. stock exchanges currently have market values of at least 1trillion,andninearedeeplyinvolvedinartificialintelligence(AI).Theyarelistedindescendingorderbasedontheupside(ordownside)impliedbythemediantargetpriceamongWallStreetanalystsasofOctober3.MetaPlatforms(NASDAQ:META)hasamediantargetof880 per ...