Here's what's up on Tuesday's Squawk on the Street:

--The first week of the second half. We're looking at energy stocks like ExxonMobil and Chevron. Plus a few spicy stocks: Chipotleand Buffalo Wildwings both up big year to date. Can they keep up the heat?

--It's a three CEO Tuesday: Carlisle, IMax and Titan Machinery will be with us to give us their unique take on the economy.

--Also on our radar: the steel stocks. We'll be talking about US Steel, AK Steel, Arcelor Mittal and Nucor.

--The Street Poll asks where you think the S&P will finish the year as we begin the second half of 2011. Right now we're in the 1,335 range. Will we be below 1,300? Between 1,300 and 1,400?  Between 1,400 and 1,500?  Or above 1,500?  Share your opinion.

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Squawk on the Street comes to you live from the New York Stock Exchange each weekday morning at 9 a.m. ET.