Since the onset of the credit crunch, it's been hard times for merger arbitrageurs. Simply put, there have been a variety of high-profile deals that have imploded.

And, of course, we have a new one: Microsoft Corporation (Nasdaq: MSFT)'s abandonment of its proposed $47.5 billion buyout of Yahoo! Inc. (Nasdaq: YHOO).

Yet, if you look at the stock price of Yahoo!, it looks like the arbitrageurs are still optimistic that a deal will happen. In fact, there is speculation that an activist fund will launch a proxy fight.

NYMEX Holdings-(NYSE-NMX) volatility Flat as Arbs consider Chicago Mercantile Exchange (NYSE: CME) and Intercontinental Exchange (NYSE: ICE) positions after CBOT Holdings (NYSE: BOT). NMX -- an energy and metals marketplace -- has a market cap of $11.58 billion. Arbitrageurs are aware if the CME's bid for the BOT or ICE's bid for BOT does not go through, NMX could be vulnerable to a bid from the losing bidder. NMX overall option implied volatility of 33 is near its 22-week average of 31 according to Track Data, suggesting non-directional risk.

BHP Billiton-(NYSE-BHP) option implied volatility suggests Flat Risk. BHP, the world's largest mining company, has a market cap of $153 billion, is recently up $1.36 to $52.11. BHP has been frequently mentioned during the last 17-months as having an interest in doing a deal with Freeport McMoRan Copper & Gold Inc. (NYSE-FCX), Alcan Inc. (NYSE: AL) and Alcoa Inc. (NYSE: AA). Prudential has an Underweight rating on BHP. BHP overall option implied volatility of 32 is near its 26-week average according to Track Data, suggesting non-directional price fluctuations.

Option volume leaders today are: Amazon.com Inc. (NASDAQ-AMZN), Kraft Foods (NYSE-KFT) and Freeport McMoRan Copper & Gold Inc. (NYSE-FCX).

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

Alltel (NYSE: AT) volatility is Elevated as arbitrageurs wait for strategic alternatives.

• AT, a customer focused communications company with operations in 36 states, has a market cap of $21 billion with long term debt of $2.7 billion.
  
• AT is reviewing its strategic alternatives. Robert Baird says: "We believe that in an acquisition scenario that AT could fetch closer to $70 per share. However, aside from M&A potential, we believe the shares are currently trading near fair value."
  
• AT May option implied volatility of 28 is above its 26-week average of 22 according to Track Data, suggesting larger near-term price risks.

International Securities Exchange (NYSE: ISE) volatility collapses. The company is in advanced talks.

• ISE is recently up $19.08 to $64.81.
  
• The Deutsche Boerse confirmed it is in talks to buy ISE. The ISE confirmed it is in advanced talks to sell itself.
  
• ISE May at the money option implied volatility of 18 is below a level of 34 from last week and below its 26-week average of 41 according to Track Data, suggesting decreasing risk.

Option volume leaders today are: Apple Inc. (NASDAQ: AAPL), Amazon (NASDAQ: AMZN) and Dendreon (NASDAQ: DNDN).

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