LVMH, the world's largest luxury firm, saw a 4.5% rise in stock prices to €874.40 in early European trade on Thursday after reporting a surge in Q1 sales, particularly in China, where growth of 14% drove the increase. LVMH's shares are up almost 30% so far this year, with market capitalization reaching €438bn, over twice the level seen three years ago. The French company owns several luxury brands, including Louis Vuitton, Dior, Tiffany, and Hennessy cognac.