Traders can't believe the Dow's performance today.

A topsy-turvy day of trading ended with the Dow, S&P and Nasdaq giving up all of the gains they have made year to date with the Dow falling as much as 846 points at one point. 

All three major indices were down at least 3% at one point.

The Dow fell more than 1,000 points for the second time this week as markets endured another bloodbath Thursday.

The Dow Jones Industrial Average fell 4.15%, or 1,033 points, to 23,861 while the Nasdaq declined 3.9%, or 275 points, to 6,777 and the S&P 500 dropped 3.75%, or 100 points to 2,581.

Here were the stories moving markets Thursday. 

Tesla Has All Its Eggs in the Elon Musk Basket

Brian Sozzi has Tesla's (TSLA - Get Report) worst case scenario if CEO Elon Musk can't deliver on the company's promises

Activision Is a Buy Ahead of Earnings

Activision Blizzard (ATVI - Get Report) is flashing multiple buy signals ahead of its earnings release after the closing bell Thursday. 

CVS Has Big Plans for Aetna

Here's how CVS' (CVS - Get Report) acquisition of Aetna (AET) could help transform the company into Apple (AAPL - Get Report) .