▁email ▁news let ters , ▁digital ▁mag az ines ▁and ▁other ▁advert iser - supported ▁media ▁produced ▁by ▁its ▁members . ▁The ▁company ▁is ▁a ▁not - for - pro fit , ▁( 5 0 1 ( c )( 6 ) ▁organization , ▁and ▁is ▁one ▁of ▁the ▁largest ▁aud itor ▁of ▁media ▁in ▁the ▁world ▁in ▁terms ▁of ▁membership , ▁which ▁consists ▁of ▁media ▁own ers , ▁mark eter ▁companies ▁and ▁advert ising ▁ag encies . ▁In ▁addition ▁to ▁its ▁US ▁headquarters , ▁B PA ▁oper ates ▁offices ▁in ▁Canada , ▁UK , ▁China ▁and ▁the ▁Middle ▁East . ▁B PA ▁is ▁similar ▁to ▁Alliance ▁for ▁Aud ited ▁Media , ▁providing ▁independent , ▁third - party ▁verified ▁data ▁that ▁media ▁own ers ▁provide ▁to ▁media ▁buy ers ▁and ▁advert is ers . ▁ ▁History ▁ ▁In ▁ 1 9 3 1 , ▁Control led ▁Cir cul ation ▁Aud it ▁Inc ▁( CC A ) ▁opened ▁in ▁New ▁York ▁City . ▁Their ▁first ▁aud it , ▁D rug ▁Top ics , ▁was ▁completed ▁in ▁September ▁of ▁that ▁year . ▁ ▁In ▁ 1 9 5 4 , ▁the ▁C CA ▁changed ▁its ▁name ▁to ▁B PA , ▁which ▁at ▁the ▁time ▁stood ▁for ▁Business ▁Publications ▁Aud it ▁of ▁Cir cul ation , ▁Inc . ▁In ▁the ▁same ▁year ▁that ▁they ▁opened ▁their ▁first ▁satellite ▁office ▁in ▁Chicago , ▁Illinois . ▁In ▁ 1 9 7 0 ▁B PA ▁completed ▁its ▁first ▁aud it ▁of ▁a ▁European ▁title , ▁V ision . ▁ ▁In