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

On this episode of Stock Movers:

- Super Micro Computer (SMCI) shares jumped after the company issued a business update that included raising its fourth-quarter gross margins outlook and saying the backlog was at a record.

- AT&T (T) is gaining after the telecom company reported second-quarter results that beat expectations on key metrics, including wireless postpaid phone net adds and adjusted earnings.

- Reddit (RDDT) shares are lower after the Wall Street Journal reported that the social forum company has discussed cutting off Google’s access to its content for AI use.