Amazon's fourth-quarter earnings and revenue significantly beat estimates, with revenue reaching $170 billion, up 14 year-over-year. Net income surged to $10.6 billion from $278 million year-over-year, as cost cuts took effect from job cuts and investment trims. AWS sales were $24.2 billion, matching estimates and up 13 year-over-year with growth slowing from prior periods. Advertising revenue grew 27 to $14.7 billion and will expand further with new Prime Video ads. First-quarter revenue guidance of $138 to 143.5 billion topped estimates and represented 8 to 13 growth year-over-year.