The contest

On March 24, CNNMoney will name the winner of our fourth annual March Stock Mania tournament, an homage to the NCAA brackets - Wall Street style! And we want you to decide which is the most worthy stock.

How to play

We picked 32 contenders based on the most popular tickers searched by CNNMoney readers and seeded them based on market value. Go through each contest and pick which stock you'd rather own. You must select a winner in each bracket to submit your results. Come back each day this week to see who advanced to the next round and vote again to pick who should keep moving on through the brackets. At the end of the week, we'll be down to our final two.

How to share

Once you've cast your vote, tweet your picks with the hashtag #MarchStockMania. Check back regularly to see who is winning and get your friends and co-workers to vote. We'll also be tweeting results and updates from @CNNMoney, @CNNMoneyInvest, @LaMonicaBuzz, @ben_rooney, @JesseSolomonCNN and @ctymkiwcnn.