Thinkorswim (NASDAQ: SWIM) will be acquired by TD AmeriTrade (NASDAQ: AMTD). At closing, each shares of SWIM will be exchanged for $3.34 in cash and 0.3980 of an AMTD share. SWIM January 5 straddle closed at $1.00, February 5 straddle closed at $1.50. SWIM overall option implied volatility of 78 is near its 26-week average according to Track Data, suggesting non-directional price movement.

AMTD says it "expects the transaction to be accretive by approximately three to seven percent of fiscal 2010 GAAP earnings and 10 to 15 percent 12 months following the completed integration." AMTD January option implied volatility is at 68, February is at 73; above its 26-week average of 67 according to Track Data, suggesting larger price movement.

OptionXpress (NASDAQ: OXPS) closed at $13.32. OXPS January option implied volatility is at 64, February is at 59; near its 26-week average of according to Track Data, suggesting non-directional price fluctuations.

Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com

MOST NOTEWORTHY: OptionXpress Holdings, Supertex and Syngenta were today's noteworthy initiations:

• Merriman believes OptionXpress Holdings (NASDAQ: OXPS) has lost market share, and remains vulnerable on many fronts. They expect the competitive landscape will continue to intensify, pressuring margins and growth rates. The firm initiated shares with a Sell rating.
• Morgan Keegan started Supertex (NASDAQ: SUPX) with a Market Perform rating, citing lack of near-term catalysts.
• Syngenta (NYSE: SYT) was initiated with an Outperform rating at Bear, as they are positive on the company's defensive growth profile and valuation.

OTHER INITIATIONS:

• HSBC initiated FedEx (NYSE: FDX) with a Neutral rating and $102 target and United Parcel Service (NYSE: UPS) with an Overweight rating and $86 target.
• Credit Suisse started Liberty Media (NASDAQ: LCAPA) with an Outperform rating and $140 target.