Pandora and Twitter are big market movers

NEW YORK (AP) -- Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:

NYSE

Pandora Media Inc., up $3.90 to $31.49

The internet radio company continues to hold off iTunes Radio and announced an in-car ad platform at the International CES gadget show.

Hhgregg Inc., down 67 cents to $12.93

The retailer issues guidance well below Wall Street expectations and says it's taking a beating in consumer electronics.

The Men's Wearhouse Inc., up $1.09 to $51.68

The clothier goes hostile in its bid for Jos. A. Bank with a $1.61 billion offer and announces plans to nominate two board members.

Twitter Inc., down $2.71 to $66.29

Morgan Stanley is the latest to downgrade the social media site, pointing to the difficulty of growing in such a crowded space.

Nasdaq

Sirius XM Holdings Inc., up 26 cents to $3.83

Liberty Media, which owns about 53 percent of the online radio company, wants to take full control.

First Solar Inc., down $5.48 to $51.26

Goldman Sachs strips the solar company of its "Buy" rating and slashes its target price by $16, seeing declining profits ahead.

CombiMatrix Corp., up 30 cents to $2.84

A regulatory filing reveals that Longwood Capital Partners bought a 5.1 percent stake in the molecular diagnostics company.

Celgene Corp. down $7.19 to $162.62

Goldman Sachs downgrades the drug developer as its stock grows more pricey and on the performance of its psoriatic arthritis drug.