https://www.reuters.com/article/us-s4-capital-deal/sorrells-s4-capital-content-arm-buys-firewood-ad-agency-in-digital-push-idUSKBN1WN0J6

S4 Capital's content unit, MediaMonks, is set to merge with Silicon Valley's biggest independent agency, Firewood, as the Martin Sorrell advertising vehicle ramps up its digital push and raises funds to expand.