Quarter-end outlook: What to buy and sell

Traders work the floor of the New York Stock Exchange.
Adam Jeffery | CNBC
Traders work the floor of the New York Stock Exchange.

The S&P 500 is set to close the first quarter of 2015 with its ninth consecutive gain, rising more than 45 percent since the end of December 2012. The streak marks only the fourth time since World War II that stocks managed such a feat.

So what's next? CNBC Pro takes you through the play-by-play over the past three months, and highlights where the experts believe market strength will come from in coming months.