Precision Drilling (NYSE: PDS) announced the purchase of Grey Wolf (NYSE: GW) for $5.00 in cash and 0.1883 newly-issued Precision trust units for each GW share.

The transaction will establish PDS as one of the largest U.S. land drillers with a combined fleet of 371 drilling rigs.

PDS September option implied volatility of 46 is near its 26-week average of 43 according to Track Data, suggesting non-directional price movements.

GW overall option implied volatility of 45 is near its 26-week average, suggesting non-directional price movements.

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

MOST NOTEWORTHY: Siemens , Siliconware Precision and Palm were today's noteworthy upgrades:

• Goldman upgraded Siemens AG (NYSE: SI) to Buy from Neutral and views shares as defensive in the current environment.
  
• Merriman upgraded shares of Siliconware Precision (NASDAQ: SPIL) to Buy from Neutral on valuation, as they believe the negative sentiment regarding the U.S. economy is already priced into shares.
• JP Morgan upgraded Palm (NASDAQ: PALM) to Overweight from Underweight citing new smart-phone products expected in 2008 and stronger-than-expected Centro sales.

OTHER UPGRADES:

• Pep Boys (NYSE: PBY) was raised to Neutral from Underperform at Credit Suisse.
• Jefferies upgraded Pioneer Drilling (NYSE: PDC) to Buy from Hold.
• Deutsche Bank upgraded Cablevision (NYSE: CVC) to Buy from Hold.

Gasoline inventories dropped below their five-year average and are now 6% below last year's average, according to Joseph Dancy, an adjunct professor at Southern Methodist University, in an essay published in Barron's this weekend.

This means the outlook for investing in energy remains good, Dancy believes, as demand for gasoline will grow 2% with little supply relief in sight. Particularly the lack of new refinery capacity means positive growth prospects for a company like Matrix Service Company (NASDAQ: MTRX) that specializes in repair and maintenance services to the refining, distribution and pipelines sectors.

Dancy wrote the supply and demand balance for energy could mean a sharp escalation of energy prices. Mexico's Cantarell field's output, the second largest in the world as measured by output, declined 17% in March from year-earlier levels, while offset by new production increases at a nearby field, total crude production from Mexico is down 5%. In addition, Venezuela production should get hit at some point as Chavez has taken control of exploring for and producing energy away from the foreign experts. And Nigeria, who sends 1 million barrels per day to the US, is also in a politically tenuous situation.

Add to this, the huge swing producer, Saudi Arabia, announced that is will no longer increase production after 2009, which might indicate the nature of its oil reserves.

In addition to Matrix, Arena Resources Inc (NYSE: ARD), OMNI Energy Services Corporation (NASDAQ: OMNI), Pioneer Drilling Company (AMEX: PDC), Natural Gas Services Group Inc (AMEX: NGS) were mentioned as attractive investment ideas.