Why Tesla Stock Hit the Brakes Today

The stock of Tesla (TSLA -5.27%) has been on a bit of a winning streak. Shares have soared by more than 15% in just the last week. That streak looks to be coming to an end today, though.Tesla stock was trading down 4.5% as of 11:40 a.m. ET on Wednesday, declining by over 7% at the morning low. The reason for the drop is expanding competition in the self-driving vehicle sector. A recent announcement could mean that Alphabet's Waymo and Toyota may soon be taking a bite out of Tesla's growth plans.Who's the re ...