Rockville Centre, NY

• Ranked No. 9 in the Top Companies in New York-Northern New Jersey-Long Island, NY-NJ-PA
• Ranked No. 16 in the Top Companies in Advertising & Marketing

What it does: Online search marketing. Clients include Register.com and Chase.

Why it's growing: It helps clients spend efficiently. Did-it analyzes the prior performance of a client's search advertising to identify missed and potential opportunities, segmenting time of day, day of week, geography, season, and so forth to see when spending improves revenue. "When you run the technology, all of a sudden you realize: Weekday afternoons between noon and three in Chicago, I can afford twice as much per click as I can against my national average," says co-founder Kevin Lee.

What's noteworthy: This is co-founder Dave Pasternack's second Inc. 500 company. MSC International made the 1987 Inc. 500 list at the No. 4 spot.

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