STOCKS FALL, SNAPCHAT SURGES: Here's what you need to know (SNAP, BA, CAT)

The major US equity indexes closed lower on Thursday, retreating after logging the strongest performance of 2017 on Wednesday.
Here's the scoreboard:
Dow: 21,002.97, -112.58, (-0.53%)
S&P 500: 2,381.92, -14.04, (-0.59%)
Nasdaq: 5,861.22, -42.81, (-0.73%)
US 10-year yield: 2.491%, +0.029
Snap surged in its trading debut. The parent company of Snapchat opened for trading at $24, up about 41% from the IPO price of $17. At the opening price, Snap had a valuation of about