Investors are growing optimistic about Wall Street as stocks achieve record highs and the market gears up for an exceptional month of growth. In a remarkable feat, the Dow Jones Industrial Average closed above 40,000 for the first time last week, marking a huge milestone in just 874 trading days since surpassing 30,000.Goldman Sachs (GS) , Microsoft (MSFT) , and UnitedHealth (UNH) played pivotal roles in propelling the Dow from 30,000 to 40,000, reflecting a diverse composition within the index (read: 5 Sto ...