Rivian (RIVN) shares accelerated after Uber Technologies (UBER) said it will invest $1.25 billion into the EV company's robotaxi fleet. Diane King Hall talks about how it signals a gear shift in the autonomous driving industry. On the earnings front, Five Below (FIVE) showed what Diane calls "really strong" same-store sales. Elliott Investment is making another stake, this time in Invisalign maker Align Technology (ALGN).