Apple Inc.’s much-awaited quarterly earnings report failed to soothe investor concerns about its biggest challenges, including escalating tariff costs and a slowdown in China.

The company announced it upped its quarterly cash dividend to $0.26 per share and its board approved a $100 billion share buyback program.

Sales in the so-called Greater China region fell 2.25 per cent to US$16 billion, down from US$16.37 billion a year ago, according to its earnings statement released on Thursday, reflecting ongoing challenges in Apple’s second-largest market.