OSI Systems (OSIS), one of the two companies licensed to sell full-body scanners to the Transportation Security Administration, is recently down 63 cents to $35.25. Overall option implied volatility of 34 is near its 26-week average of 35, according to Track Data, suggesting nondirectional price movement.

J. Crew (JCG) announced that it has entered into a definitive agreement to be acquired by funds affiliated with TPG Capital and Leonard Green & Partners. Millard Drexler will continue as chairman and CEO and maintain a significant equity investment in J. Crew. Under the terms of the agreement, holders of the outstanding common shares of J. Crew will receive $43.50 per share in cash, or a total of approximately $3 billion. December call option implied volatility is at 19, below a level of 55 from November 22 and below its 26-week average of 46, according to Track Data, suggesting decreasing price movement.

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

"The attempted Christmas terrorist attack caused me to assess what stocks would benefit from increased attention to the security sector," says Glenn Rogers.

In Gordon Pape's The Internet Wealth Builder, he reviews four defense plays -- L-3 Communications (LLL), Cogent Systems (COGT), American Scientific & Engineering (ASEI) and OSI Systems (OSIS).

Today was down to the wire, where you didn't know if we'd see a positive or negative close until right before 4:00 PM. A very positive regional economic report from Chicago was trumped by what some feared was a NASDAQ bomb threat because of sloppy reporting in and around New York City, and because of media outlets taking advantage of post-failed-terror hype. Oil inventories were mixed but prices still rose on the day.

Here were today's unofficial closing bell levels:

Dow 10,548.51 +3.10 (0.03%)
S&P 500 1,126.42 +0.23 (0.02%)
Nasdaq 2,291.28 +2.88 (0.13%)

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Results for the tech stocks in last week's preview were a mixed bag, some beats, some misses, some in line. By and large, expectations for tech companies reporting results this week remain high, though. Here's what analysts surveyed by Thomson Financial are anticipating in the way of earnings, as compared to the same period of the previous year.

• Solarfun Power Holdings Co. Ltd. (NASDAQ: SOLF): $1.48 EPS (+73.0%) on sales of $1.3 billion (+171.0%)
• Marvell Technology Group Ltd. (NASDAQ: MRVL): $0.21 EPS (+71.4%) on sales of $836.7 million (+27.4%)
• Solera Holdings Inc. (NYSE: SLH): $0.29 EPS (+51.7%) on sales of $137.0 million (+11.8%)
• Applied Signal Technology Inc. (NASDAQ: APSG): $0.14 EPS (+42.9%) on sales of $46.4 million (+17.4%)
• China Finance Online Co. Ltd. (NASDAQ: JRJC): $0.14 EPS (+42.6%) on sales of $13.3 million (+131.5%)
• OSI Systems Inc. (NASDAQ: OSIS): $0.38 EPS (+36.8%) on sales of $162.0 million (+6.0%)
• LaBarge Inc. (AMEX: LB): $0.27 EPS (+33.3%) on sales of $71.6 million (+10.4%)
• Esterline Technologies Corp. (NYSE: ESL): $0.69 EPS (+11.6%) on sales of $374.6 million (+14.8%)
• Dell Inc. (NASDAQ: DELL): $0.36 EPS (+11.1%) on sales of $15.9 billion (+7.8%)
• HEICO Corp. (NYSE: HEI): $0.46 EPS (+13.0%) on sales of $147.1 million (+10.5%)
• Daktronics Inc. (NASDAQ: DAKT): $0.17 EPS (flat) on sales of $141.5 million (+17.0%)
• Novell Inc. (NASDAQ: NOVL): $0.05 EPS (flat) on sales of $241.4 million (-0.7%)
• Omnivision Technologies Inc. (NASDAQ: OVTI): $0.29 EPS (-17.1%) on sales of $172.5 million (-0.4%)
• Sigma Designs Inc. (NASDAQ: SIGM): $0.39 EPS (-18.8%) on sales of $58.7 million (+37.9%)