Ending the week on a high note are Tile Shop Hldgs, Inc. (NASDAQ:TTS), American Railcar Industries, Inc. (NASDAQ:ARII) and Kindred Biosciences Inc (NASDAQ:KIN), today’s midday gainers. As for the losers, we’ve got Groupon Inc (NASDAQ:GRPN), Cabot Oil & Gas Corporation (NYSE:COG) and Valmont Industries, Inc. (NYSE:VMI).

Groupon Inc GRPN

Solid Results Give Tile Shop a Boost

First in line is Tile Shop Hldgs, Inc. (NASDAQ:, up +14.03%. The company reported fourth quarter and full year results, with comparable store sales up +10.1% and +12.4% in the respective periods. The firm plans to open eight more stores and reaffirmed its 2014 revenue and EPS guidance. Tiger Global has a small stake in the company.

Following TTS is yesterday’s midday gainer, American Railcar Industries, Inc. (NASDAQ:ARII), which today racked up a jump of +8.33%. The Carl Icahn favorite is up +22.22% since Monday and +33.55% YTD.

Third on today’s list is Kindred Biosciences Inc (NASDAQ:KIN), a company focused on developing pharmaceuticals for pets. Its shares increased +7.98% of its first day of trading following its IPO. Billionaires Seth Klarman and Thomas Steyer have bet on this one.

Groupon Takes a Major Dive

Taking the steepest fall of the day is online discount platform Groupon Inc (NASDAQ:GRPN), down -18.01%. The company said it expects a loss this quarter and provided a weak outlook for 2014, even though its Q4 2013 revenues were up. The stock is down -29.48% YTD.

Independent oil and gas company Cabot Oil & Gas Corporation (NYSE:COG) slipped today as well, its stock price falling -6.72%. The company released earnings and new long-term sales agreements yesterday. Highlights include record production and cash flow from operations and a +112% increase in net income over 2012. Unfortunately, investors took this as a cue to sell and make a profit – not an opportunity to buy.  Daniel Loeb, Richard Chilton, Jorge Lemann and Ray Dalio have positions in the firm.

Down -5.92%, Valmont Industries, Inc. (NYSE:VMI) is the third and final company on today’s list of losers. This David Tepper pick, a producer of fabricated metal products, announced results that were in line with analysts’ consensus, including per-share earnings of $2.66 in the quarter. However, it missed the mark on revenues.