Some less actively traded names seeing bullish order flow: Finisar (FNSR), Polycom (PLCM), Medicis Pharmaceuticals (MRX) Bearish order flow: Praxair (PX), Wabco Holdings (WBC), Pinnacle Entertainment (PNK) Post Earnings: American Oriental (AOB), GTX Inc (GTXI) Pre-Earnings: AthenaHealth (ATHN), Factset (FDS) Ex-div.: Apollo Investment (AINV)

*Scanning all single-stocks subject to 2500 contracts minimum call or put volume

Baidu.com (BIDU) shares have been volatile today, hitting a high of $628.50 on uncertainty about Google’s (GOOG) plans for China. Flyonthewall says we’re likely to see increasing interest in a GOOG – BIDU pairs trade, where investors sell Google and buy Baidu on the idea that what’s bad for Google Internet search is good for its biggest competitor in China. BIDU rallied to fresh all-time highs in morning action, but has since come off its best levels. With shares now up $20.76 to $571 options volume is 3X the average daily, with 45K calls and 41K puts traded. The top trade is a bearish Mar 580 – 590 put spread at $5 on ISE. Beyond that, the next biggest trade is a lot of 258 Jun 600 calls on the bid $33.30. Meanwihle, BIDU implied volatility is up about 10 percent to 38.

GE is flat at $17.04 and March 17.5 calls are busy Monday. More than 43K traded and some of the action might be closing. Open interest is 181.4K and the biggest OI position of any GE contract. However, the top trade is a block of 2738 contracts at 17 cents on the ISE, which traded just after the opening bell and appears to be an opening customer buyer, according to ISEE data. The interest in GE calls comes on news the company is selling its electrostatic precipitator and emissions monitoring businesses to McDermott and the day before it presents at a Goldman Sachs Industrial Unscripted Conference. GE is also presenting at a Jefferies Global Clean Tech Conference tomorrow and Wednesday.

*Scanning all single-stocks subject to 2500 contracts minimum call or put volume

Walmart (WMT) is up $1.05 to $54.95 and Mar 55 calls are among the most actives early Monday after Citigroup upgraded the stock to Buy. 13.1K traded (20% Bid / 27% Mid / 53% Ask). Another 8500 April 55 calls also changed hands. Implied volatility in WMT is steady around 14.25 as the stock runs towards 2009 and early 2010 resistance highs between $52.00 and $52.20.

Sorry, a little glitch this morning due to the Daylight Savings time change. Some of the updates are appearing multiple times. It should be fixed now. Sorry for the inconvenience. (Premium subscribers use ticker symbol @all and then 1 in the Flow Monitor to view the stories and additional bullish/bearish updates as well.)

Amlyin Pharmaceuticals (AMLN) implied volatility is crashing after the company received a complete response letter from the FDA related to exenatide once weekly. In a conference call, the company said it expects product approval once issues are addressed. Shares touched a new 52-week high and are up $1.66 to $21.92 on the news. Trading in the options is active, with 14K calls and 8450 puts, incuding a recent seller of 1100 Mar 21 calls at $1.25. Meanwhile, implied volatility has plummeted about 155 percent, back to the mid 50s, now that this event risk has passed.