While U.S. equities and stock exchange traded funds inched higher Tuesday on corporate results, investors remained cautious in their outlook ahead of the two-day Federal Reserve meeting.

The S&P 500 Index, along with related funds including the SPDR S&P 500 ETF (NYSEArca: SPY), iShares Core S&P 500 ETF (NYSEArca: IVV) and Vanguard 500 Index (NYSEArca: VOO), were relatively unchanged Tuesday.

U.S. stocks were modestly higher, aided by an Apple (NasdaqGS: AAPL) rise in technology stocks. Apple shares hit a record high for the second straight day.

Major equity indices mostly climbed over the past few weeks on strong first quarter corporate results. Over two thirds of S&P 500 companies having reported earnings and are on track to post their best quarterly result since late 2011, the Wall Street Journal reports.