By Sue Chang, MarketWatch
SAN FRANCISCO (MarketWatch) -- Among the companies whose shares are expected to see active trade in Tuesday's session are McDonald's Corp., Yum Brands Inc., Gilead Sciences Inc. and AT&T Inc.
Before the bell Tuesday
Comcast (CMCSA) is projected to report first-quarter earnings of 64 cents a share, according to a consensus survey by FactSet.
for UPDATE: McDonald's, Gilead, Yum, AT&T are stocks to watch investment picks