Shares of Apple Inc. AAPL, -1.46% rose 0.9% in midday trading, putting them on track for a fourth-straight gain. The stock, which has rallied 5.8% during the win streak, is also headed for the highest close since Oct. 9, 2018. The stock's gains come in the wake of the iPhone Launch Event on Tuesday. Apple rejoined the trillion-dollar market capitalization club on Wednesday for the first time since Nov. 1. The market cap was recently $1.02 trillion, just behind Microsoft Corp.'s MSFT, -1.16% first-place market cap of $1.05 trillion. Apple's stock has run up 43.0% year to date and Microsoft shares have hiked up 35.2%, while the Dow Jones Industrial Average DJIA, -0.59% has gained 16.8%.