Take a look at some of Wednesday's midday movers:
Alkermes - The company surged after reporting positive results on its experimental schizophrenia drug.
Lennar - The home builder and others including Toll Brothers, KB Home, PulteGroup and DR Horton gained amid reports President Barack Obama on Thursday will announce a cut in Federal Housing Administration mortgage-insurance premiums.
Janus Capital Group - The asset manager climbed rose after JPMorgan upgraded the stock to overweight from underweight.
Joy Global - The miner fell after KeyBanc downgraded the stock to hold from buy.
Molson Coors Brewing - The beer maker rose on plans to bring two of its brands to Chile.
Supervalu - The wholesale distributor edged higher after posting better-than-expected third-quarter results.
Monsanto - The seed producer advanced after posting better-than-expected first-quarter results.
Arena Pharmaceuticals - The drug developer soared after reporting positive results from a clinical trial of its possible treatment of autoimmune diseases.
Garmin - The GPS company climbed after Morgan Stanley upgraded the stock to equal weight from underweight.
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