as nyse omc s & p 500 component industry advertising public relations founded 1986 ; 30 years ago 1986 headquarters new york city united states area served global key people john d. wren ceo & president bruce crawford chairman products advertising customer relationship management crm digital marketing direct and promotional marketing interactive marketing public relations strategic media planning and buying other specialty communications services revenue us 15.1344 billion 2015 1 operating income us 1.9201 billion 2015 1 number of employees 74 000 2015 2 subsidiaries bbdo worldwide ddb worldwide diversified agency services omnicom media group tbwa worldwide website http www.omnicomgroup.com omnicom group inc. is an american based global marketing and corporate communications holding company headquartered in new york city . omnicom s branded networks and specialty firms provide services in four disciplines advertising customer relationship management crm public relations and specialty services . the services included in these disciplines are media planning and buying digital and interactive marketing sports and events marketing field marketing and brand consultancy . 3 omnicom group was ranked as one of the four largest advertising agencies in the world by the new york times in 2002 . 4 in 2014 omnicom was considered the second largest advertising holding company by the wall street journal . 5 the company employs more than 74 000 employees in about 100 countries worldwide . 6 contents 1 history 2 operations 2.1 bbdo worldwide 2.2 das 2.3 ddb worldwide 2.4 omnicom media group 2.5 tbwa 3 see also 4 references 5 external links history edit in 1986 allen rosenshine keith reinhard and john bernbach co created omnicom in a three way merger of bbdo worldwide doyle dane bernbach and needham harper worldwide . 7 dubbed the big bang the merger aligned each agency on the founding principle of creativity . 8 9 in 1989 rosenshine stepped down as chairman of omnicom to return to his role running bbdo worldwide and bruce crawford was put in place as the chairman of omnicom . 10 in 1997 john wren the number two executive at omnicom moved up to the ceo role while crawford remained as a chairman . 11 under wren the company has grown into the second largest agency holding company and had revenue of over 15 billion in 2014 . 12 operations edit omnicom operates as a holding company and is composed of five major agency networks . the networks are bbdo worldwide diversified agency services das ddb worldwide omnicom media group omg and tbwa worldwide . bbdo worldwide edit main article bbdo bbdo worldwide is a creative agency within the omnicom network and was one of the companies that took part in the initial merger that formed omnicom . in addition to being recognized as one of the most creative networks in the world 13 several of the bbdo agencies were ranked in the top 50 awarded individual agencies in the world by the gunn report . 14 founded in 2000 proximity worldwide is bbdo s digitally focused marketing arm . in january 2016 bbdo worldwide acquired a majority stake in wednesday agency group . 15 the agency also owns sellbytel . das edit the das group of companies is a group of marketing services that includes over 200 companies in the following marketing disciplines public relations crm healthcare events promotional marketing branding and research . some of the businesses included in the das network are alcone omnicom health group critical mass fleishman hillard goodby silverstein & partners the marketing arm porter novelli and c space . citation needed ddb worldwide edit main article ddb worldwide ddb worldwide is one of the three advertising networks it offers brand building campaign management and creative advertising development . 16 some of the businesses included in the ddb worldwide unit are tribal worldwide adam & eve ddb roberts langer spike ddb traceylocke interbrand and uproar ddb . 17 in november 2015 ddb worldwide acquired grupo abc the largest advertising group in brazil . 18 omnicom media group edit omnicom media group is the media division of the omnicom group inc. 19 companies operating in their network include media networks omd worldwide phd worldwide data and analytics company annalect and performance media firm resolution media . citation needed tbwa edit main article tbwa worldwide tbwa is a global agency network with a philosophy of disruption 20 is normally billed as an alternative agency . it was purchased in 1993 and then merged with the chiat day firm in 1995 . in the united states some of the companies offices still retain the tbwa chiat day name . 21 companies operating under the tbwa network include digital arts network dan the integer group gsd & m zimmerman advertising and other tbwa branded regional agencies . 21 see also edit history of advertising references edit a b omnicom group reports full year and fourth quarter 2015 results . omnicom group overview . bloomberg business . retrieved 11 february 2016 . omnicom group about . omnicom . retrieved 11 february 2016 . elliott stuart 31 march 2002 . advertising s big four it s their world now . the new york times . retrieved 11 february 2016 . tadena nathalie ; jamerson joshua 22 july 2014 . omnicom posts strong sales growth . the wall street journal . retrieved 11 february 2016 . the worlds biggest public companies omnicom . retrieved 11 february 2016 . delo cotton 5 august 2015 . ddb s keith reinhard on the origins of omnicom . beet.tv . retrieved 10 february 2016 . marshal caroline 24 february 2006 . the omnicom chief executive john wren has combined creative integrity and a humble outlook to build the world s biggest advertising holding company . caroline marshal meets him in new york . campaign magazine . retrieved 10 february 2016 . tungate mark 3 may 2013 . adland a global history of advertising . kogan page publishers . p. 149 . advertising s big bang is making noise at last . bloomberg business . 31 march 1999 . retrieved 10 february 2016 . lazarus george 5 december 1996 . wren to land on top perch at omnicom group . the chicago tribune . retrieved 10 february 2016 . bruell alexandra 10 february 2015 . omnicom boosts net income 11.4 % to over 1 billion in 2014 . advertising age . retrieved 10 february 2016 . o leary noreen 15 december 2014 . agency of the year bbdo s tennacity turned a major client loss into a minor setback . adweek . retrieved 10 february 2016 . bbdo worldwide won the gunn report as the most creative agency network . digital agency network . 30 january 2015 . retrieved 10 february 2016 . bbdo buys majority stake in wednesday agency group . ddb worldwide communications group inc. company profile . hoovers . retrieved 10 february 2016 . mcclellan steve 24 june 2014 . ddb reorganizes its new york operations . mediapost . retrieved 10 february 2016 . ddb buys grupo abc brazil s biggest independent ad group . omnicom media group profile . retrieved 10 february 2016 . o leary noreen 16 february 2015 . inside tbwa new york s reinvention ; after exec changes and account losses shop aims to become network flagship . adweek . retrieved 10 february 2016 . a b tbwa worldwide profile . ad brands . retrieved 10 february 2016 . external links edit official website v t e omnicom group global advertising brands bbdo proximity worldwide sellbytel ddb worldwide interbrand tribal ddb tbwa worldwide tbwa chiat day the integer group national advertising agencies goodby silverstein & partners gsd & m martin williams merkley partners roberts langer zimmerman advertising media services omnicom media group omd manning gottlieb omd phd prometheus m2m hearts & science media specialist solutions icon international novus omg outdoor media group resolution media accuen fuse drum diversified agency services customer relationship management the beanstalk group siegel gale wolff olins cpm gmr marketing organic hall & partners m a r c research the marketing arm davie brown 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