(Reuters) - U.S. stock futures gave up earlier gains on Wednesday stemming from Apple’s forecast-beating results, as caution set in ahead of the Federal Reserve’s comments on inflation and monetary policy.

Traders work on the floor of the New York Stock Exchange (NYSE) in New York, U.S., May 1, 2018. REUTERS/Brendan McDermid

Expectations the Fed will signal more policy tightening ahead kept investors wary of big market moves, especially after currency markets were roiled this week by the dollar’s surge to 3 1/2-month highs against a basket of currencies.

Despite U.S. companies being on track to post their strongest quarterly profit growth in seven years, worries about inflation and rising raw material costs have weighed on investors’ minds.

Apple (AAPL.O) rose 3.8 percent in premarket trading after it posted resilient iPhone sales in the face of waning global demand and promised $100 billion in additional stock buybacks.

The company’s suppliers Cirrus Logic (CRUS.O), Lumentum Holdings (LITE.O) and Skyworks Solutions (SWKS.O) were all up between 2.3 percent and 10 percent, helping the Nasdaq 100 e-minis NQc1 edge up 0.75 points, or 0.01 percent.

The Dow e-minis 1YMc1 were down 45 points, or 0.19 percent. S&P 500 e-minis ESc1 were down 3 points, or 0.11 percent.

Recent data showed inflation hit the Fed’s 2-percent target, while another set of data showed commodity prices have been rising in the wake of the Trump administration’s tariffs on steel and aluminum imports.

“Our colleagues expect the Committee to upgrade the inflation language to note that inflation has risen and is near their 2 percent objective,” Deutsche Bank strategist Jim Reid wrote in a note to clients.

“They could also note that market-based measures of inflation compensation have risen further

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