T-Mobile US Inc TMUS.O gained 3.2% as it raised its full-year postpaid subscriber net additions forecast. U.S. Treasury Secretary Janet Yellen said on Tuesday she sees no inflation problem brewing, downplaying earlier comments that rate hikes may be needed to stop the economy overheating as President Joe Biden's spending plans boost growth. The ADP National Employment Report showed U.S. private payrolls increased in April as companies rushed to boost production amid a surge in demand, powered by massive government aid and rising vaccinations against COVID-19.