Take a look at some of Tuesday's midday movers:
3M - The industrial conglomerate's shares advanced after it affirmed its outlook and increased its dividend.
Dish Network - Shares of the satellite-television company gained after it and Sprint said they would join forces in creating a fixed-wireless-broadband service on a trial basis in Texas. Shares of Sprint also rose.
iRobot - Shares of the robotics company surged after Raymond James upgraded the stock to a strong buy from market perform.
Facebook - The social-networking company rose after The Wall Street Journal reported Facebook would start selling video advertisements later in the week.
Seagate Technology - Shares of the provider of electronic-data storage gained after JPMorgan upgraded its stock to neutral from underweight.
Williams Companies - Shares of the pipeline operator rose a day after Corvex Management said in a securities filing that it held an 8.82 percent stake in the company.
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—By CNBC's Kate Gibson.
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