WPP shares surge 29% — best day since 1992 after better-than-expected results

Shares in British marketing and PR holding company WPP surged as much as 29% on Thursday — the biggest single-day jump since 1992 — after results showed a sales decline shallower than analysts had expected. Investors took it as a sign that new CEO Cindy Rose has stemmed the deterioration. The biggest test ahead is the impact of artificial intelligence on the marketing industry.