Option traders appear to be setting up for a bullish move on TransDigm Group Incorporated (TDG). Traders plowed into 1,865 new call option contracts -- 84.77 times the average volume -- on the stock on Thursday. And we know that traders were eager to get into this trade because 96% of the trades came in on the ask price.

TransDigm has been hitting 52-week highs for a few days in a row now. The stock closed Thursday at $61.25, up 7.65% during the past month.

Analyst Upgrades

• Argus upgraded Weyerhaeuser (WY) to buy from hold, citing the better-than-expected Q1 report and expectations that the company is about to be profitable. The firm has a $59 target on the stock.
• Weeden upgraded Cameron (CAM) to buy from hold as it views the recent sell-off as overdone.
• Oppenheimer upgraded Mobile Mini (MINI) to outperform from perform based on valuation and what the firm sees as the company's attractive risk/reward ratio. The firm set a $25 target.
• Johnson Controls (JCI) was upgraded to buy from hold at Deutsche Bank.
• EnerNOC (ENOC) was upgraded to buy from neutral at Janney Montgomery.
• Checkpoint (CKP) was upgraded to outperform from neutral at Baird.

Analyst Upgrades

• Apollo Group (APOL) was upgraded to sector perform from underperform at RBC Capital. The firm has a $75 target on the stock.
• JPMorgan raised Westlake Chemical (WLK) to overweight from neutral.
• Morgans Hotel (MHGC) was upgraded to outperform from market perform at JMP Securities.

• Oppenheimer upgraded Savient Pharmaceuticals (NASDAQ: SVNT) to Perform from Underperform after the FDA's Arthritis Advisory Committee voted 14-1 in favor of approving Krystexxa for gout.
• Banc of America/Merrill upgraded Texas Instruments (NYSE: TXN) to Buy from Underperform and raised its target to $27 from $18 based on expectations that margin expansion will be higher than Street expectations.
• UBS said Nvidia (NASDAQ: NVDA) has limited downside risk given the improved outlook for the graphics processor market and professional solutions business. Shares were upgraded to Neutral from Sell and its target was raised to $11.50 from $8.
• BHP Billiton (NYSE: BHP) was upgraded to Outperform from Neutral at Macquarie.
• Neutral Tandem (NASDAQ: TNDM) was upgraded to Outperform from Neutral at Baird.
• Central Garden & Pet (NASDAQ: CENT) was upgraded to Buy from Neutral at SunTrust.

Neutral Tandem (NASDAQ: TNDM) provides third-party interconnection services to competitive telecommunications carriers. In a nutshell, TNDM helps wire-line, wireless and broadband customers talk to each other -- even if they all pay their bills to different companies. Neutral Tandem offers services in more than 60 U.S. metropolitan markets and is a critical part of our nation's communications network. The company's customers include Sprint Nextel, Comcast Cable and AT&T.

Neutral Tandem earned $9 million or 27 cents per share in the first quarter, compared with $4 million or 12 cents per share in the year-ago period. TNDM's earnings beat estimates by four cents for a 17.4% earnings surprise, sending shares up 15.6% in just the week following the announcement!

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• KeyBanc upgraded Greenbrier (NYSE: GBX) to Buy from Hold as it believes the company has options to forestall covenant violations or bankruptcy, event if conditions deteriorate further.
  
• Friedman Billings upgraded Whole Foods (NASDAQ: WFMI) to Market Perform from Underperform citing low expectations, favorable FTC settlement, progress on cost cutting, and valuation.
  
• JP Morgan believes First Merit (NASDAQ: FMER) is one of the best positioned Midwest banks to weather the storm and notes its compelling valuation and capital levels. The firm upgraded shares to Overweight from Neutral.
• Coca-Cola Enterprises (NYSE: CCE) was raised to Buy from Neutral at Goldman.
  
• Newell Rubbermaid (NYSE: NWL) was upgraded to Buy from Neutral at Banc of America/Merrill.
  
• Compass Minerals (NYSE: CMP) was lifted to Outperform from Perform at Oppenheimer.