Amazon ( AMZN ), a top holding that's on IBD's Leaderboard, soared 22% last month.Starbucks ( SBUX ), another top holding that's on the Leaderboard, high-jumped 10%.Facebook ( FB ), a third top holding on the Leaderboard, climbed 13%. Investors decided that their fears in August and September of China's economy suffering a hard landing were overblown, said Tony Rodriguez, co-head of fixed income for Nuveen Asset Management. Decent but not great corporate earnings, plus low inflationary pressure, also give the Fed room to delay a rate hike.