Charter Lower; AmEx Expenses Surges; Verizon Erases Gains

Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:

- Charter Communications (CHTR) shares are lower in the premarket after the cable company reported second-quarter results that missed expectations on key metrics, including adjusted Ebitda and free cash flow.

- American Express (AXP) shares are falling as even as it posted better-than-expected second-quarter profit as its cardholder base continued to spend in the past three months. The company said second-quarter expenses surged 12% as the company spent more on marketing to attract and retain premium cardholders.

- Verizon (VZ) is lower, erasing an initial advance that came after the telecom company reported second-quarter results that beat expectations and raised its full-year forecast for adjusted earnings. 

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