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.

“We’re beginning to see the fruits of some better growth showing up in the bottom line,” Larry Hatheway, chief economist at GAM, told the WSJ.

However, traders remained cautious ahead of the Fed meeting. Fed officials are widely expected to stand pat on interest rates this round, but investors are waiting for the central bank’s final statement Wednesday for any hints of potential changes in the June meeting, reports Tanya Agrawal for Reuters.

Investors also refrained from committing to any riskier bets in light of weaker-than-expected economic growth numbers in the first quarter. Market gains were capped by a dip in auto stocks after automakers revealed a fall in new vehicle sales in April.

“I think the auto sales numbers have caused the market to take a step back,” Brent Schutte, chief investment strategist at Northwestern Mutual Wealth Management Company, told Reuters. “I think people are reading too much into that. There’s a fear that is building on last quarter’s GDP numbers that the consumer is pulling back, which we don’t think is the case.”

For more information on the markets and U.S. Stock ETFs, visit our S&P 500 category.