Oklahoma turns 100 years old this year, and I wrote a bit about its business climate in my recent Investing in Oklahoma post. That post featured some growth companies based in Oklahoma: Arena Resources Inc. (NYSE: ARD), Helmerich & Payne Inc. (NYSE: HP), Unit Corp. (NYSE: UNT), Chesapeake Energy Corp. (NYSE: CHK), ONEOK Inc. (NYSE: OKE), Devon Energy Corp. (NYSE: DVN), and the Williams Companies (NYSE: WMB).

Earlier this year, the Motley Fool also took at look at Oklahoma companies, and focused on some of the same energy sector companies that I did. Its search also included two non-energy companies as well: drive-in burger chain Sonic Corp. (NASDAQ: SONC) for its growth potential, and Tulsa-based Dollar Thrifty Automotive (NYSE: DTG).

Sonic recently announced 21 consecutive years of positive same-store sales performance, and reaffirmed its 33 cents earnings per share earnings expectations for the fourth quarter. For fiscal 2008, Sonic expects earnings growth of 15% to 17%. The consensus of analysts surveyed by Thomson Financial is that Sonic is a buy. The share price was $23.40 at the close on Friday, up from a 52-week low of $20.02 in late July, not yet quite back to its 52-week high of $25.09 in May, but still up from its stumble at the end of August after an analyst's downgrade based on labor and dairy costs. That was before the announcement and reaffirmed expectations mentioned above. Also, Sonic made the Forbes list of 100 best mid cap stocks in America.

MOST NOTEWORTHY: AVX Corp (AVX), Vishay Intertechnology Inc (VSH), Buffalo Wild Wings (BWLD) and three car-rental companies were today's noteworthy downgrades:

• American Technology downgraded both AVX Corp (NYSE: AVX) and Vishay Intertechnology Inc (NYSE: VSH) to Sell from Buy after channel checks suggested weaker than expected demand for the June quarter from Europe, EMS, and distribution.

• Sanders Morris believes investors should take profits in Buffalo Wild Wings Inc (NASDAQ: BWLD), cutting shares to Sell from Buy, and sees limited catalysts on the horizon that could drive shares higher.

• Morgan Stanley downgraded car rental companies Avis Budget Group (NYSE: CAR), Dollar Thrifty Automotive (NYSE: DTG) and Hertz Global Holdings (NYSE: HTZ) to Underweight from Equal-Weight to reflect weak Q2 rental prices.

OTHER DOWNGRADES:

• Lehman downgraded Amgen Inc(NASDAQ: AMGN) to EqualWeight from Overweight.

• Caris cut Limited Inc (NYSE: LTD) to Below Average from Average.

• Goldman downgraded Nvidia Corp (NASDAQ: NVDA) to Neutral from Buy.

• Soleil downgraded Cinemark Holdings Inc (NYSE: CNK) to Hold from Buy.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).

BEA Systems (NASDAQ: BEAS) -- option volume heavy on open as renewed Chatter circulates. BEAS is a leading supplier of middle-ware software. BEAS has a market cap of $4.5 billion with long term debt of $230 million. BEAS reported 2006 revenue of $1.199 billion. BEAS call option volume of 11,213 contracts compares to put volume of 578 contracts. BEAS has been frequently mentioned as an acquisition target for IBM (NYSE: IBM) and Oracle Corp. (NASDAQ: ORCL) over the last 18 months. BEAS June option implied volatility of 49 is above its 26-week average of 36 according to Track Data, suggesting larger price risk.

Dollar Thrifty Automotive (NASDAQ: DTG) -- options calm as DTG rallies on Speculation. DTG, a daily rental agency of vehicles, has a market cap of $1.1b billion. DTG is recently up $0.85 to $50 on M&A speculation. DTG over all option implied volatility of 25 is below its 26-week average of 28 according to Track Data, suggesting decreasing price risk.

Option volume leaders today are: Dendreon Corp. (NASDAQ: DNDN), Washington Mutual (NYSE: WM), Motorola, Inc. (NYSE: MOT) and Cisco Systems (NASDAQ: CSCO).

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