Take a look at some of Tuesday's midday movers:
Barclays (London Stock Exchange: BARC-GB) - The London-based bank fell after a collapse in its investment banking unit pressured first-quarter profits.
Delta Air Lines (DAL) - The carrier rose after announcing a $2 billion share buyback and boosting its quarterly dividend 50 percent to 9 cents a share.
Discovery Communications (DISCA) - The media company fell after its first-quarter revenue came in below estimates.
Hillshire Brands (HSH) - The packaged meat company moved higher after posting better-than-expected third-quarter results.
Martha Steward Living Omnimedia (MSO) - The media and merchandising company fell as weakness in its publishing and broadcasting segments continued in the first quarter and overall revenue declined.
Nvidia (NVDA) - The graphics processing units manufacturer declined after reporting quarterly results above estimates but failed to provide a forecast for the current quarter.
Office Depot (ODP) - The retailer rose after posting better-than-expected quarterly earnings and saying it will close at least 400 stores.
Pfizer (PFE) - The pharmaceutical company declined as AstraZeneca (London Stock Exchange: AZN-GB)laid out its defense against its rival's $106 billion takeover offer by predicting sales would rise by three quarters over the next decade.
Twitter (TWTR) - The social media company plummeting as its six-month lock-up period that had restricted the sale of 82 percent of its outstanding stock ended.
Wellcare Health Plans (WCG) - The provider of managed care services gained after its first-quarter profit more than doubled on stronger revenue and increased membership.
(Read More: See CNBC's Market Insider Blog )
-By CNBC's Rich Fisherman.
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