Wall Street optimistic ahead of bumper earnings day By: CNBC.com News April 21, 2015 at 06:00 AM EDT U.S. stock index futures indicated a higher open on Tuesday, ahead of a spate of major earnings and as oil futures for May were set to expire. Read More >> Related Stocks: Amgen Baker Hughes Inc Chipotle Mexican Grill Discover Financial Services Genuine Parts Harley-Davidson Illumina Inc Intuitive Surgical Kimberly-Clark Lockheed Martin Sentinelone Inc Cl A Under Armour United Technologies Verizon Communications Vmware Inc Yahoo Yum Brands