MARTIN SORRELL

I turned a shopping basket company into the world's largest advertising group. Never underestimate ambition.

Digital disrupts everything. Companies that don't adapt don't survive.

I started S4 Capital at 73. If they thought I was going to retire, they don't know me.

The best deals are the ones where the target company is 10 times your size.

Scale wins in advertising. Bigger gets better rates, attracts bigger clients, and invests more in tech.

Every dinner is a networking opportunity. I don't have meals — I have meetings.