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Check out the companies making headlines in midday trading.

Amazon — Shares of Amazon popped 13.5% following a stellar quarterly report. The company said its investment in electric vehicle company Rivian gained almost $12 billion in the fourth quarter. Amazon Web Services delivered almost 40% year-over-year growth in the fourth quarter, beating Wall Street estimates. Amazon also announced it would increase the price of Prime to $139 from $119 for annual memberships. The cost of a monthly Prime membership will also rise to $14.99 from $12.99.

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