Apple and Palantir shares slide in premarket trading following post-bell earnings

Apple and Palantir shares fell in premarket trading Tuesday after both announced earnings after the bell on Monday.

Apple dropped 4.4% and Palantir lost 5.9%.

The iPhone-maker reported better-than-expected revenue in its fourth-quarter earnings, but fell short of estimates on iPad sales and issued a margin forecast that disappointed investors.

Palantir beat Wall Street's third-quart estimates, with with U.S. commercial revenue topping government for the first time.

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