Until last year, Chase advertised on 400,000 websites. In March of this year, Lemkau slashed that number to 5,000, because only 12,000 of those sites were actually generating any clicks on Chase ads. In making this radical decision, Lemkau not only helped Chase curtail wasteful expenditure, but also shed light on the murky world of digital programmatic ads. Today, Chase has expanded its footprint back up to 10,000 sites. Lemkau continued pushing the brand forward on its winning streak after an uber-successful digital marketing push around its card, the Sapphire Reserve, in 2016.