New York-based iCrossing, a division of Hearst Corporation, tops the latest Ad Age list of top 25 search marketing agencies by revenue released today. (Link is available to subscribers only.) The agency brought in $105 million in search-related revenues in 2011, up 13.6% from the previous year.

Rounding out the top five were Dentsu’s 360i, WPP Group’s Group M Search, Aegis Group’s iProspect, and Performics, a Publicis Groupe company.

Several standalone agencies did make the rankings. The Search Agency, based in Los Angeles, came in 7th, with $32 million in search revenue in 2011. New York-based Acronym Media was 9th in the listings, with $31 million in search revenue last year. Covario, based in San Diego, brought in $21 million from search last year, earning it a number 15 spot in the rankings.

Most of the agencies increased their search revenue from 2010 to 2011. Covario was the fastest-growing, raising its search revenues by 76% year-over-year. Other agencies showing strong growth include Merkle’s Impaqt (46%) and BKV (43%), of Overland Park, Kansas.

Some companies’ search revenues did slip, however. Neo@Ogilvy was down 6% year-over year. Rapp, an Omnicom agency, showed a 5% drop; and Atrinsic Interactive was down 4%.

Related Topics: Channel: Strategy | SEM Industry: General | Stats

About The Author: Pamela Parker is a contributing editor for Search Engine Land and Executive Features Editor at Marketing Land. She’s a well-respected authority on digital marketing, having reported and written on the subject since 1998, including a stint as managing editor of ClickZ. She’s also worked to help monetize independent publishers’ sites at Federated Media Publishing. She blogs about media and marketing at The River and about cooking, gardening and parenthood at Free Range. She can be found on Twitter as @pamelaparker. See more articles by Pamela Parker

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