Mergers & Acquisitions Exclusive: S4 Capital Acquires 2 Agencies, Signals More to Come in 2021 Decoded Advertising and Metric Theory join the S4 fold Adweek Fastest Growing honoree Decoded Advertising merges with MediaMonks. S4 Capital By Doug Zanger January 4, 2021 Sir Martin Sorrell’s S4 Capital is starting off 2021 with two acquisitions. Doug Zanger @zanger doug.zanger@adweek.com Doug Zanger is a senior editor, agencies at Adweek, focusing on creativity and agencies.