Alphabet shares dropped after the search giant fell short of Wall Street's fourth-quarter revenue expectations and announced big spending plans

Alphabet shares fell more than 9% in after-hours trading Tuesday after the company reported fourth-quarter results that missed on revenue expectations and announced more artificial intelligence investments. Earnings per share for the Google parent company beat analysts' estimates by two cents. Here are other numbers Wall Street was watching:

Alphabet said on Tuesday it will spend $75 billion on its AI buildout this year, 29% more than Wall Street expected, and investors signaled disappointment at a missed cloud revenue target and began showing impatience over profitability.